CORPUS I

Welding PETROBRAS N-133 and design standard recommendations shall be complied with the following complementation: -PUBLICN- 2163 REV.

if the concentrations and temperatures provided by the project are such that the manufacture specifications demand thermal treatment after welding, or by the raise of corrosiveness (corrosion risk) under fluid stress due to the temperature reached inside because of the welding; e) acetylene, ethylene, benzene and other unsaturated hydrocarbons or even polymers that might suffer exothermal and spontaneous decomposition under certain pressure and temperature combinations; f) hydrogen,

Responsible for the Hot Tapping and Stopple ...............................................................

Austenitic, Duplex and Superduplex Stainless Steels .................................................

E ENGLISH 05 / 2011 PROPERTY OF PETROBRAS 39 pages, 3 forms, Index of Revisions and WG Welding and Hot Tapping on in-service Equipment, Industrial Piping and Pipelines Procedure This Standard replaces and cancels its previous revision.

pressure of pipeline in the installation area of the connection (MPa); PTH - hydrostatic test pressure of the connection (MPa); Pop - operation pressure in the pipeline during the hydrostatic test performance (MPa); Sy - minimum flow tension specified for the pipeline material (MPa); t - minimum thickness of the pipeline in the installation area of connection (mm); P - differential maximum external pressure to be applied during hydrostatic test of the connection (MPa); E - elastic modulus

It is characterized by verbs of a nonmandatory nature.

   — Equation 2 for carbon over 0.12%: 15 Cu Ni 5 Cr Mo V 6 CEIIW C Mn        NOTE When it is not possible, we shall appeal to the maximum CE of the certificate or specification of manufacture standard of material, with previous approval from the work inspection and professional responsible for the welding. b) check, in cases with history of crust, (like calcium carbonate and barium sulfate), whether there is formation of deposits inside the piping that might interfere in the flow

stiffener, compatible with the base metal, installed through welding (such as, split sleeve, overlapped reinforcing element, filling with weld, mechanical connector) in a defective area of the in-service equipment, piping or pipeline, in order to restore its mechanical resistance due to the design conditions (see Figure A.2 of Annex A) 3.11 responsible for the hot tapping and stopple operation PETROBRAS’ or the contractor’s employee, with professional education in the mechanical area, trained

24 Annex B - Calculation of the Hydrostatic Test Pressure .......................................................................

cutting tool; h) provide suitable access for entrance and exit of the working place; in case of buried pipeline, provide a ditch with enough size to allow the welder or welders to have suitable access to the weld place, especially at the overhead region; i) provide efficient mechanical ventilation, suitable lighting and escape routes permanently clear in places below the ground level (diggings, wells, galleries) where welding works take place; j) keep, during the entire performance of the works,

In buried pipelines with external cathodic protection by impressed current, history of damages caused by hydrogen shall be checked and maximum hardness limitation of HAZ (Heat-Affected Zone) at 280 HV5 shall be adopted at the qualification of welding procedure. 6.1.4

- Petroleum and Natural Gas Industries - Steel Pipe for Pipeline Transportation Systems; API 510:2006 - Pressure Vessel Inspection Code: In-Service Inspection, Rating, Repair, and Alteration; API 570:2009 - Piping Inspection Code: In-Service Inspection, Rating, Repair, and Alteration of Piping Systems; API RP 579-1:2007 - Fitness-for-Service; API RP 2201:2003 - Safe Hot Tapping Practices in the Petroleum & Petrochemical Industries; API RP 2207:2007 - Preparing Tank Bottoms for Hot Work; API STD

29 Figure A.8 - Deposition Sequence to be Used in the Welding of Circumferential Welds of Split Sleeve30 Figure A.9 - Typical Deposition Sequence of the Buttering Pass and Temper Bead ...........................

E ENGLISH 05 / 2011 PROPERTY OF PETROBRAS 39 pages, 3 forms, Index of Revisions and WG Welding and Hot Tapping on in-service Equipment, Industrial Piping and Pipelines Procedure This Standard replaces and cancels its previous revision.

2: Alternative Rules for Construction of Pressure Vessels; ASME BPVC Section IX:2010 - Boiler and Pressure Vessel Code - Section IX - Qualification Standard for Welding and Brazing Procedures, Welders, Brazers, and Welding and Brazing Operators - Welding and Brazing Qualifications; AWS A 3.0:2001 - Welding Terms and Definitions; BSI BS 7910:2005 - Guide on Methods for Assessing the Acceptability of Flaws in Metallic Structures; WRC Bulletin 537:2010 - Local Stresses in Spherical and

[Recommended Practice] NOTE 3 Induction heating equipment may be used when required pre-heating temperatures are over 80 ºC.

E ENGLISH 05 / 2011 PROPERTY OF PETROBRAS 39 pages, 3 forms, Index of Revisions and WG Welding and Hot Tapping on in-service Equipment, Industrial Piping and Pipelines Procedure This Standard replaces and cancels its previous revision.

the pre-heating even for humidity removal might not work, in this case there is no option left but operational changes that eliminate the humidity condensation on surface to be welded. b) equipment, piping or pipelines with internal clad or liner of more noble materials (like stainless steels, nickel alloys) may be welded, provided that the generated thermal cycle does not introduce major microstructural modifications on the internal wall and that come to affect the corrosion resistance,

Ferritic Steels For welding on ferritic steels the following additional requirements shall be observed: a) in operational or climatic conditions that favor superficial humidity deposition, the use of pre-heating is recommended, even if it has not been required by the welding procedure, using oxidant flame with LPG tank (maximum temperature of 60 ºC); [Recommended Practice] NOTE 1 Heating torch (oxygen and propane or acetylene) may be used when pre-heating temperatures up to 80 ºC are required.

E ENGLISH 05 / 2011 PROPERTY OF PETROBRAS 39 pages, 3 forms, Index of Revisions and WG Welding and Hot Tapping on in-service Equipment, Industrial Piping and Pipelines Procedure This Standard replaces and cancels its previous revision.

E ENGLISH 05 / 2011 PROPERTY OF PETROBRAS 39 pages, 3 forms, Index of Revisions and WG Welding and Hot Tapping on in-service Equipment, Industrial Piping and Pipelines Procedure This Standard replaces and cancels its previous revision.

or connection surface that might prevent the welding execution; d) protect the area to be welded in order to ensure suitable weather conditions for the welding (free of strong winds, rain, sand wind, humid air flux); e) in split sleeve or large connections installation, their positioning and binding shall be executed by mean of steel chain and hydraulic jacks or hydraulic belts for a better adjustment (Figure A.5 of Annex A); f) before the welding, the dimensional visual inspection of

Make sure that the relief valve supports the pressure and that it is in perfect operational conditions. 8.7.5

For in–service welding of ferritic steels: a) it is recommended welding process: TIG (Tungsten Inert Gas) (GTAW - Gas Tungsten Arc Welding), MIG/MAG (Metal Inert Gas/Metal Active Gas) (GMAW - Gas Metal Arc Welding) or Shielded Electrode (SMAW - Shielded Metal Arc Welding); [Recommended Practice] b) for the shielded electrode process, use basic type electrodes of low hydrogen (H8 maximum level).

for time unit 3.17 hot tapping drilling technique, with hole saw and orbit, on in-service piping, pipeline or equipment, through a previously installed connection using specific equipment (HTM - Figure A.1 of Annex A) and without operational shutdown 3.18 cold crack cracks that occur in ferritic steels at temperatures below 100 ºC due to three factors, which are: fragile microstructure (normally martensite), tensile residual stress and presence of hydrogen in the weld region (see Figure A.4 of

for time unit 3.17 hot tapping drilling technique, with hole saw and orbit, on in-service piping, pipeline or equipment, through a previously installed connection using specific equipment (HTM - Figure A.1 of Annex A) and without operational shutdown 3.18 cold crack cracks that occur in ferritic steels at temperatures below 100 ºC due to three factors, which are: fragile microstructure (normally martensite), tensile residual stress and presence of hydrogen in the weld region (see Figure A.4 of

2: Alternative Rules for Construction of Pressure Vessels; ASME BPVC Section IX:2010 - Boiler and Pressure Vessel Code - Section IX - Qualification Standard for Welding and Brazing Procedures, Welders, Brazers, and Welding and Brazing Operators - Welding and Brazing Qualifications; AWS A 3.0:2001 - Welding Terms and Definitions; BSI BS 7910:2005 - Guide on Methods for Assessing the Acceptability of Flaws in Metallic Structures; WRC Bulletin 537:2010 - Local Stresses in Spherical and

agreement with the technical specifications provided in the project of welding in cargo and recommendations listed in this Standard, including at least: a) external dimensional inspection of the pipeline, piping and equipment; b) inspection of the pipe wall, piping and equipment integrity; c) measurement of the pipeline, piping and equipment (EC) electrical conductivity; d) metallographic replica, if applicable, in pipeline, piping and equipment; e) adjustment, alignment and binding of

[Recommended Practice] NOTE 2 Heating elements also may be used instead of LPG to remove superficial humidity, but only when the area to be heated is small (for example, connections for installation of corrosion samples).

The operator shall have expertise on hot tapping equipment, with professionalizing education in mechanic area, trained and experienced in hot tapping and stopple works.

The welding on Electric Resistance Welding (ERW) welds shall only be executed after metallographic evaluation on field and finding of the non-existence of oriented segregation.

A.2 of Annex A) 3.2 CEIIW equivalent carbon according to formula of the “International Institute of Welding” (see ISO 3183:2007) 3.3 CEpcm equivalent carbon according to formula of Ito-Bessyo (see ISO 3183:2007) 3.4 equipment element of industrial plant or of production or oil storage facility, its derivatives and others, such as: tank, pressure vessel, derrick and heat exchanger 3.5 Hot Tapping Machine - HTM equipment used for executing drilling on in-service equipment, piping and

base metal, installed through welding (such as, split sleeve, overlapped reinforcing element, filling with weld, mechanical connector) in a defective area of the in-service equipment, piping or pipeline, in order to restore its mechanical resistance due to the design conditions (see Figure A.2 of Annex A) 3.11 responsible for the hot tapping and stopple operation PETROBRAS’ or the contractor’s employee, with professional education in the mechanical area, trained and with proven experience in hot

   — Equation 2 for carbon over 0.12%: 15 Cu Ni 5 Cr Mo V 6 CEIIW C Mn        NOTE When it is not possible, we shall appeal to the maximum CE of the certificate or specification of manufacture standard of material, with previous approval from the work inspection and professional responsible for the welding. b) check, in cases with history of crust, (like calcium carbonate and barium sulfate), whether there is formation of deposits inside the piping that might interfere in the flow rate

The welding on equipment, piping and pipelines containing hydrocarbons, such as natural gas, oil, diesel oil, propane, naphtha, gasoline, LPG (Liquefied Petroleum Gas), anhydrous and hydrous alcohol and MTBE (Methyl-Tertiary-Butyl Ether), may be performed in the majority of situations regularly faced in refineries, storage terminals and pipelines of the company.

requirement (see Notes 1 to 4) t  12.70 mm Yes or no No drilling risk 6.35 mm < t < 12.70 mm Yes No drilling risk 6.35 mm < t < 12.70 mm No Evaluate drilling risk 5.00 mm  t  6.35 mm Yes or no Evaluate drilling risk and operational conditions 3.20 mm  t < 5.00 mm Yes or no Evaluate drilling risk, employment of buttering and temper bead with electrode of maximum 2.5 mm diameter aiming at the lowest possible thermal contribution and evaluation of the operational conditions NOTE 1 The

In case of existing discontinuities, execute engineering study in order to enable execution of the work in the place or define relocation when possible; f) check existence of ovalisation and straightness of the pipeline or piping in order to minimize opening at the circumferential weld root of split sleeve and accessories for hot tapping and stopple.

vapor pressure does not exceed 2.8ºkg/cm2 under 37 ºC 3.8 drilling (“blowout” - “burnthrough”) phenomenon in which the welding arc penetration into pressurized metallic wall is enough to reduce resistant useful section (“blowout”) or even to drill the resistant useful section (“burnthrough”), causing a leakage (see Figure A.3 of Annex A) 3.9 stopple Intervention in the system with or without operational shutdown with or without flow deviation of the pipeline or piping 3.10 structural repair

E ENGLISH 05 / 2011 4 Figure A.6 - Typical Drawing of Groove with built-in Backing for Longitudinal Welding of Split Sleeve28 Figure A.7 - Deposition Sequence to Be Used in the Welding of Longitudinal Welds..........................

Proposed revisions to this Standard shall be submitted to the CONTEC - Authoring Subcommittee, indicating the alphanumeric identification and revision of the Standard, the section, subsection and enumerate to be revised, the proposed text, and technical/economic justification for revision.

to have suitable access to the weld place, especially at the overhead region; i) provide efficient mechanical ventilation, suitable lighting and escape routes permanently clear in places below the ground level (diggings, wells, galleries) where welding works take place; j) keep, during the entire performance of the works, a supervisor responsible for the services execution (connection installation, welding and hot tapping), meeting the following requirements: — carry communication equipment

API RP 2201:2003 - Safe Hot Tapping Practices in the Petroleum & Petrochemical Industries; API RP 2207:2007 - Preparing Tank Bottoms for Hot Work; API STD 598:2009 - Valve Inspection and Testing; API STD 650:2007 - Welded Tanks for Oil Storage; API STD 653:2009 - Tank Inspection, Repair, Alteration, and Reconstruction; API STD 1104:2005 - Welding of Pipelines and Related Facilities; ASME B31.3:2008 - Process Piping; ASME B31.4:2009 - Pipeline Transportation Systems for Liquid Hydrocarbons

pressure; SF - safety factor for the pressure definition = 4.0; P Classe - maximum pressure accepted for the pressure class of the connection (MPa); PMOP - operation maximum pressure of pipeline in the installation area of the connection (MPa); PTH - hydrostatic test pressure of the connection (MPa); Pop - operation pressure in the pipeline during the hydrostatic test performance (MPa); Sy - minimum flow tension specified for the pipeline material (MPa); t - minimum thickness of the pipeline in

The welding on equipment, piping and pipelines containing hydrocarbons, such as natural gas, oil, diesel oil, propane, naphtha, gasoline, LPG (Liquefied Petroleum Gas), anhydrous and hydrous alcohol and MTBE (Methyl-Tertiary-Butyl Ether), may be performed in the majority of situations regularly faced in refineries, storage terminals and pipelines of the company.

retardant clothing, when necessary, for all the personnel involved at the work site; c) ensure clear emergency escape routes, with lighting mark and widely known by those directly or indirectly involved in the works; d) warn all the professionals and their supervisors involved in the works on their intrinsic risks and procedures to comply with; e) perform all the necessary tests regarding inflammable vapors, oxygen and dangerous pollutants in the air, in order to ensure safe environment; f) make

A.2 of Annex A) 3.2 CEIIW equivalent carbon according to formula of the “International Institute of Welding” (see ISO 3183:2007) 3.3 CEpcm equivalent carbon according to formula of Ito-Bessyo (see ISO 3183:2007) 3.4 equipment element of industrial plant or of production or oil storage facility, its derivatives and others, such as: tank, pressure vessel, derrick and heat exchanger 3.5 Hot Tapping Machine - HTM equipment used for executing drilling on in-service equipment, piping and

Austenitic, Duplex and Superduplex Stainless Steels .................................................

Hot tapping shall not be performed in equipment that operates with the following products: peroxides, chlorine (Cl2), hydrogen (H2), oxygen (O2), Hydrogen sulfide (H2S), caustic or acid substances. 8.2.2

7.4 The valve of injection shall be compatible with the pressure category of the stuffing box.

The equipment for hot tapping (hand-operated, pneumatic, hydraulic or electric) shall be capable of retaining and removing the portion of metallic wall. 8.3.2

A technical analysis of the facilities layout shall be performed regarding the cargo handling and scaffold assembly, and the possible interference with hot tapping equipment. 8.1.7

The welding on equipment, piping and pipelines containing hydrocarbons, such as natural gas, oil, diesel oil, propane, naphtha, gasoline, LPG (Liquefied Petroleum Gas), anhydrous and hydrous alcohol and MTBE (Methyl-Tertiary-Butyl Ether), may be performed in the majority of situations regularly faced in refineries, storage terminals and pipelines of the company.

equivalent carbon according to formula of Ito-Bessyo (see ISO 3183:2007) 3.4 equipment element of industrial plant or of production or oil storage facility, its derivatives and others, such as: tank, pressure vessel, derrick and heat exchanger 3.5 Hot Tapping Machine - HTM equipment used for executing drilling on in-service equipment, piping and pipelines 3.6 corrosion fluid any fluid that may cause damage to the hot tapping machine or to the welded steel through chemical or electrochemical

In case of doubt, the Portuguese version, which is the valid document for all intents and purposes, shall be used.

fluid stress due to the temperature reached inside because of the welding; e) acetylene, ethylene, benzene and other unsaturated hydrocarbons or even polymers that might suffer exothermal and spontaneous decomposition under certain pressure and temperature combinations; f) hydrogen, unless used after the project or materials conditions examination; g) lines under vacuum or pressure less than the atmospheric, unless that an evaluation is carried out in order to define safe operating procedure

34 Annex D - Checklist for the Welding Services on In-Service Equipment, Piping or Pipeline................

Hot tapping shall not be performed in equipment that operates with the following products: peroxides, chlorine (Cl2), hydrogen (H2), oxygen (O2), Hydrogen sulfide (H2S), caustic or acid substances. 8.2.2

of piping), except when approved by PETROBRAS inspection due to an engineering review; g) ensure that the local thickness of the base metal supports installation of a new connection; h) design the hot tapping connections, the weld repair and changes to comply with the applicable standards, as follows: — for piping designed in accordance with ASME B31.3:2008 use API 570:2009; — for pipelines designed in accordance with ASME B31.4:2009 and B31.8:2010 use ASME B31.4:2009; — for oil storage tanks

Spectroscopy equipment: — Equation 1 for carbon less or equal to 0.12 %: CEpcm C Si Mn Cu Ni Cr Mo V 5B 30 20 20 60 20 15 10          — Equation 2 for carbon over 0.12%: 15 Cu Ni 5 Cr Mo V 6 CEIIW C Mn        NOTE When it is not possible, we shall appeal to the maximum CE of the certificate or specification of manufacture standard of material, with previous approval from the work inspection and professional responsible for the welding. b) check, in cases with history of crust,

Work Permit; PETROBRAS N-2301 - Preparation of the Welding Technical Documentation; PETROBRAS N-2349 - Safety in Welding and Cutting Works; PETROBRAS N-2726 - Terminologia de Dutos; ABNT NBR 14842:2003 - Critérios para a Qualificação e Certificação de Inspetores de Soldagem; ISO 3183:2007 - Petroleum and Natural Gas Industries - Steel Pipe for Pipeline Transportation Systems; API 510:2006 - Pressure Vessel Inspection Code: In-Service Inspection, Rating, Repair, and Alteration; API 570:2009 -

E ENGLISH 05 / 2011 PROPERTY OF PETROBRAS 39 pages, 3 forms, Index of Revisions and WG Welding and Hot Tapping on in-service Equipment, Industrial Piping and Pipelines Procedure This Standard replaces and cancels its previous revision.

e Certificação de Inspetores de Soldagem; ISO 3183:2007 - Petroleum and Natural Gas Industries - Steel Pipe for Pipeline Transportation Systems; API 510:2006 - Pressure Vessel Inspection Code: In-Service Inspection, Rating, Repair, and Alteration; API 570:2009 - Piping Inspection Code: In-Service Inspection, Rating, Repair, and Alteration of Piping Systems; API RP 579-1:2007 - Fitness-for-Service; API RP 2201:2003 - Safe Hot Tapping Practices in the Petroleum & Petrochemical Industries;

connector) in a defective area of the in-service equipment, piping or pipeline, in order to restore its mechanical resistance due to the design conditions (see Figure A.2 of Annex A) 3.11 responsible for the hot tapping and stopple operation PETROBRAS’ or the contractor’s employee, with professional education in the mechanical area, trained and with proven experience in hot tapping and stopple activities 3.12 responsible for the welding on behalf of PETROBRAS, for in-service welding, the welding

Ultrasonic in Welds; PETROBRAS N-1596 - Non-Destructive Testing - Penetrant Testing; PETROBRAS N-1597 - Non-Destructive Testing - Visual Testing; PETROBRAS N-1598 - Ensaios Não Destrutivos - Partículas Magnéticas; PETROBRAS N-1738 - Descontinuidades em Juntas Soldadas, Fundidos, Forjados e Laminados; PETROBRAS N-2036 - Soldagem Subaquática; PETROBRAS N-2162 - Work Permit; PETROBRAS N-2301 - Preparation of the Welding Technical Documentation; PETROBRAS N-2349 - Safety in Welding and Cutting

A.2 of Annex A) 3.2 CEIIW equivalent carbon according to formula of the “International Institute of Welding” (see ISO 3183:2007) 3.3 CEpcm equivalent carbon according to formula of Ito-Bessyo (see ISO 3183:2007) 3.4 equipment element of industrial plant or of production or oil storage facility, its derivatives and others, such as: tank, pressure vessel, derrick and heat exchanger 3.5 Hot Tapping Machine - HTM equipment used for executing drilling on in-service equipment, piping and

NOTE In equipment, piping and pipelines which are cladded or cased with the following materials: glass, lead, refractory material, polymers, coating internal casing or with superficial treatment, (such as: plating and aluminium plating), the degradation effect of the casing during the welding operation shall be considered.

pressure of pipeline in the installation area of the connection (MPa); PTH - hydrostatic test pressure of the connection (MPa); Pop - operation pressure in the pipeline during the hydrostatic test performance (MPa); Sy - minimum flow tension specified for the pipeline material (MPa); t - minimum thickness of the pipeline in the installation area of connection (mm); P - differential maximum external pressure to be applied during hydrostatic test of the connection (MPa); E - elastic modulus

connection installation, welding and hot tapping during daylight, with the due weather protection (rain, winds); l) remove the stiffener from existent welds which might interfere in the connection installation, welding and hot tapping; NOTE The weld reinforcement shall be carefully removed with abrasive disc, or appropriate tool, from a distance of at least 50 mm beyond the connection or split sleeve to be installed. m) perform hydrostatic test of the connection after welding, when operationally

flash point below 70 ºC and the absolute vapor pressure does not exceed 2.8ºkg/cm2 under 37 ºC 3.8 drilling (“blowout” - “burnthrough”) phenomenon in which the welding arc penetration into pressurized metallic wall is enough to reduce resistant useful section (“blowout”) or even to drill the resistant useful section (“burnthrough”), causing a leakage (see Figure A.3 of Annex A) 3.9 stopple Intervention in the system with or without operational shutdown with or without flow deviation of the

E ENGLISH 05 / 2011 PROPERTY OF PETROBRAS 39 pages, 3 forms, Index of Revisions and WG Welding and Hot Tapping on in-service Equipment, Industrial Piping and Pipelines Procedure This Standard replaces and cancels its previous revision.

Austenitic, Duplex and Superduplex Stainless Steels .................................................

The welding on equipment, piping and pipelines containing hydrocarbons, such as natural gas, oil, diesel oil, propane, naphtha, gasoline, LPG (Liquefied Petroleum Gas), anhydrous and hydrous alcohol and MTBE (Methyl-Tertiary-Butyl Ether), may be performed in the majority of situations regularly faced in refineries, storage terminals and pipelines of the company.

if the concentrations and temperatures provided by the project are such that the manufacture specifications demand thermal treatment after welding, or by the raise of corrosiveness (corrosion risk) under fluid stress due to the temperature reached inside because of the welding; e) acetylene, ethylene, benzene and other unsaturated hydrocarbons or even polymers that might suffer exothermal and spontaneous decomposition under certain pressure and temperature combinations; f) hydrogen,

manufacture standard of material, with previous approval from the work inspection and professional responsible for the welding. b) check, in cases with history of crust, (like calcium carbonate and barium sulfate), whether there is formation of deposits inside the piping that might interfere in the flow rate considered by the welding procedure; c) the visual inspection shall check the existence of welds, dents, arc opening and corrosion; d) prior to the beginning of the works, execute ultrasound

welding (free of strong winds, rain, sand wind, humid air flux); e) in split sleeve or large connections installation, their positioning and binding shall be executed by mean of steel chain and hydraulic jacks or hydraulic belts for a better adjustment (Figure A.5 of Annex A); f) before the welding, the dimensional visual inspection of adjustment with record shall be executed to make sure that the connection is properly positioned and bound, especially regarding parallelism and perpendicularity

shutdown with or without flow deviation of the pipeline or piping 3.10 structural repair steel stiffener, compatible with the base metal, installed through welding (such as, split sleeve, overlapped reinforcing element, filling with weld, mechanical connector) in a defective area of the in-service equipment, piping or pipeline, in order to restore its mechanical resistance due to the design conditions (see Figure A.2 of Annex A) 3.11 responsible for the hot tapping and stopple operation

E ENGLISH 05 / 2011 4 Figure A.6 - Typical Drawing of Groove with built-in Backing for Longitudinal Welding of Split Sleeve28 Figure A.7 - Deposition Sequence to Be Used in the Welding of Longitudinal Welds..........................

NOTE Measurements of the tank level shall be performed with a hand operated gauging tape, in order to check the accuracy of the remote or automatic measurers of level.

storage tanks built in accordance with API STD 650:2007 use API STD 653:2009; — for pressure vessels built in accordance with ASME BPVC Section VIII Division 1:2010 or Division 2:2010 use API 510:2006; i) define the type and dimensions of structural reinforcement that the connection shall have, such as the ones presented in the applicable design standards; to do so, the calculation procedure established in WRC Bulletin 537:2010 shall be used, or similar procedures of traditional and accredited

e) perform all the necessary tests regarding inflammable vapors, oxygen and dangerous pollutants in the air, in order to ensure safe environment; f) make available sign plates, barriers and, if necessary, work site insulation from the community and not authorized people; g) the issuance of permit for entering confined spaces shall follow guidance provided in the unit Specific Procedure (SP); h) assure that all personnel operating services in nearby areas, which might be affected by the

-PUBLICN- 2163 REV.

1.2 This Standard applies only to the welding with electric arc processes.

flange (or from a welded or threaded connection) or less than 80 mm from a welded joint (including the longitudinal weld of piping), except when approved by PETROBRAS inspection due to an engineering review; g) ensure that the local thickness of the base metal supports installation of a new connection; h) design the hot tapping connections, the weld repair and changes to comply with the applicable standards, as follows: — for piping designed in accordance with ASME B31.3:2008 use API 570:2009; —

Pressure Test The pressure test shall be hydrostatic and executed before the expected hot tapping, shall also be compulsorily before operation begins for the tightness check of the welds and flanged connections.

A.2 of Annex A) 3.2 CEIIW equivalent carbon according to formula of the “International Institute of Welding” (see ISO 3183:2007) 3.3 CEpcm equivalent carbon according to formula of Ito-Bessyo (see ISO 3183:2007) 3.4 equipment element of industrial plant or of production or oil storage facility, its derivatives and others, such as: tank, pressure vessel, derrick and heat exchanger 3.5 Hot Tapping Machine - HTM equipment used for executing drilling on in-service equipment, piping and

   — Equation 2 for carbon over 0.12%: 15 Cu Ni 5 Cr Mo V 6 CEIIW C Mn        NOTE When it is not possible, we shall appeal to the maximum CE of the certificate or specification of manufacture standard of material, with previous approval from the work inspection and professional responsible for the welding. b) check, in cases with history of crust, (like calcium carbonate and barium sulfate), whether there is formation of deposits inside the piping that might interfere in the flow

NOTE In equipment, piping and pipelines which are cladded or cased with the following materials: glass, lead, refractory material, polymers, coating internal casing or with superficial treatment, (such as: plating and aluminium plating), the degradation effect of the casing during the welding operation shall be considered.

bit guide, in order to ensure that the hole to be performed by it does not exceed the stated diameter, enabling the sample recovery; b) size connections and cutting tools suitable for housing the hot tapping equipment, in order to permit total penetration of the cutter within the limits of the machine stroke and the incessant closure of the hot tapping valve, when the cutter or sample is recovered; c) check the dimensional conformity among sealing components (joints and gaskets); d) previously

   — Equation 2 for carbon over 0.12%: 15 Cu Ni 5 Cr Mo V 6 CEIIW C Mn        NOTE When it is not possible, we shall appeal to the maximum CE of the certificate or specification of manufacture standard of material, with previous approval from the work inspection and professional responsible for the welding. b) check, in cases with history of crust, (like calcium carbonate and barium sulfate), whether there is formation of deposits inside the piping that might interfere in the flow

if the concentrations and temperatures provided by the project are such that the manufacture specifications demand thermal treatment after welding, or by the raise of corrosiveness (corrosion risk) under fluid stress due to the temperature reached inside because of the welding; e) acetylene, ethylene, benzene and other unsaturated hydrocarbons or even polymers that might suffer exothermal and spontaneous decomposition under certain pressure and temperature combinations; f) hydrogen,

2: Alternative Rules for Construction of Pressure Vessels; ASME BPVC Section IX:2010 - Boiler and Pressure Vessel Code - Section IX - Qualification Standard for Welding and Brazing Procedures, Welders, Brazers, and Welding and Brazing Operators - Welding and Brazing Qualifications; AWS A 3.0:2001 - Welding Terms and Definitions; BSI BS 7910:2005 - Guide on Methods for Assessing the Acceptability of Flaws in Metallic Structures; WRC Bulletin 537:2010 - Local Stresses in Spherical and

Before the hot tapping, the welded connections shall be hydrostatically tested in all welds in accordance with Annex B. Whenever is possible the operational conditions of the trunk line shall be considered in order to prevent its break-down submitted to external pressure.

The Department of PETROBRAS that uses this Standard is responsible for adopting and applying the sections, subsections and enumerates thereof.

The Department of PETROBRAS that uses this Standard is responsible for adopting and applying the sections, subsections and enumerates thereof.

The welding on equipment, piping and pipelines containing hydrocarbons, such as natural gas, oil, diesel oil, propane, naphtha, gasoline, LPG (Liquefied Petroleum Gas), anhydrous and hydrous alcohol and MTBE (Methyl-Tertiary-Butyl Ether), may be performed in the majority of situations regularly faced in refineries, storage terminals and pipelines of the company.

19 7 Installation of Threaded Connections before the Hot Tapping..........................................................

In case of welding of thickness from 3.2 mm to 6.35 mm, it shall: a) be used only electrodes of 2.4 mm or 2.0 mm of diameter, inverse polarity (positive electrode) for shielded electrodes; b) be evaluated the use of the buttering with annealing pass technique (see Figure A.9).

31 Table Table 1 - Minimum Thickness for Welding Execution ...........................................................................

peroxides, chlorine or other chemicals which can violently decompose or become dangerous in contact with the welding heat; d) caustic substances, amines, nitrates and acids, if the concentrations and temperatures provided by the project are such that the manufacture specifications demand thermal treatment after welding, or by the raise of corrosiveness (corrosion risk) under fluid stress due to the temperature reached inside because of the welding; e) acetylene, ethylene, benzene and other

PRCI program may be obtained at the Information and Telecommunication Technology (TIC) of PETROBRAS.

2: Alternative Rules for Construction of Pressure Vessels; ASME BPVC Section IX:2010 - Boiler and Pressure Vessel Code - Section IX - Qualification Standard for Welding and Brazing Procedures, Welders, Brazers, and Welding and Brazing Operators - Welding and Brazing Qualifications; AWS A 3.0:2001 - Welding Terms and Definitions; BSI BS 7910:2005 - Guide on Methods for Assessing the Acceptability of Flaws in Metallic Structures; WRC Bulletin 537:2010 - Local Stresses in Spherical and

- Preparing Tank Bottoms for Hot Work; API STD 598:2009 - Valve Inspection and Testing; API STD 650:2007 - Welded Tanks for Oil Storage; API STD 653:2009 - Tank Inspection, Repair, Alteration, and Reconstruction; API STD 1104:2005 - Welding of Pipelines and Related Facilities; ASME B31.3:2008 - Process Piping; ASME B31.4:2009 - Pipeline Transportation Systems for Liquid Hydrocarbons and other Liquids; ASME B31.8:2010 - Gas Transmission and Distribution Piping Systems; ASME BPVC Section VIII

condensate line), the pre-heating even for humidity removal might not work, in this case there is no option left but operational changes that eliminate the humidity condensation on surface to be welded. b) equipment, piping or pipelines with internal clad or liner of more noble materials (like stainless steels, nickel alloys) may be welded, provided that the generated thermal cycle does not introduce major microstructural modifications on the internal wall and that come to affect the corrosion

Pressure Test The pressure test shall be hydrostatic and executed before the expected hot tapping, shall also be compulsorily before operation begins for the tightness check of the welds and flanged connections.

sleeve, overlapped reinforcing element, filling with weld, mechanical connector) in a defective area of the in-service equipment, piping or pipeline, in order to restore its mechanical resistance due to the design conditions (see Figure A.2 of Annex A) 3.11 responsible for the hot tapping and stopple operation PETROBRAS’ or the contractor’s employee, with professional education in the mechanical area, trained and with proven experience in hot tapping and stopple activities 3.12 responsible for

25 Figure A.3 - Welding Arc Penetration up to the Piping or Pipeline Hole ...............................................

or connection surface that might prevent the welding execution; d) protect the area to be welded in order to ensure suitable weather conditions for the welding (free of strong winds, rain, sand wind, humid air flux); e) in split sleeve or large connections installation, their positioning and binding shall be executed by mean of steel chain and hydraulic jacks or hydraulic belts for a better adjustment (Figure A.5 of Annex A); f) before the welding, the dimensional visual inspection of

para a Qualificação e Certificação de Inspetores de Soldagem; ISO 3183:2007 - Petroleum and Natural Gas Industries - Steel Pipe for Pipeline Transportation Systems; API 510:2006 - Pressure Vessel Inspection Code: In-Service Inspection, Rating, Repair, and Alteration; API 570:2009 - Piping Inspection Code: In-Service Inspection, Rating, Repair, and Alteration of Piping Systems; API RP 579-1:2007 - Fitness-for-Service; API RP 2201:2003 - Safe Hot Tapping Practices in the Petroleum & Petrochemical

For in–service welding of ferritic steels: a) it is recommended welding process: TIG (Tungsten Inert Gas) (GTAW - Gas Tungsten Arc Welding), MIG/MAG (Metal Inert Gas/Metal Active Gas) (GMAW - Gas Metal Arc Welding) or Shielded Electrode (SMAW - Shielded Metal Arc Welding); [Recommended Practice] b) for the shielded electrode process, use basic type electrodes of low hydrogen (H8 maximum level).

sealing joint and bolts to be used, in accordance with the equipment, piping or pipeline standard (such as: standardized connections, beveled ends, t-split, wind ring and nozzles); NOTE The connection shall be considered temporarily, if it does not comply with the required standardization. b) prepare drawings or drafts of the connection to be installed; c) define the hydrostatic test pressure of the connections, based on the installation project data, according to Annex B; d) perform the welding

For in–service welding of ferritic steels: a) it is recommended welding process: TIG (Tungsten Inert Gas) (GTAW - Gas Tungsten Arc Welding), MIG/MAG (Metal Inert Gas/Metal Active Gas) (GMAW - Gas Metal Arc Welding) or Shielded Electrode (SMAW - Shielded Metal Arc Welding); [Recommended Practice] b) for the shielded electrode process, use basic type electrodes of low hydrogen (H8 maximum level).

e) perform all the necessary tests regarding inflammable vapors, oxygen and dangerous pollutants in the air, in order to ensure safe environment; f) make available sign plates, barriers and, if necessary, work site insulation from the community and not authorized people; g) the issuance of permit for entering confined spaces shall follow guidance provided in the unit Specific Procedure (SP); h) assure that all personnel operating services in nearby areas, which might be affected by the

people; g) the issuance of permit for entering confined spaces shall follow guidance provided in the unit Specific Procedure (SP); h) assure that all personnel operating services in nearby areas, which might be affected by the works or by produced emergency situations, are aware of such procedure; i) develop and make available procedures for insulating the working site in case of emergency; j) identify the materials in the area and products contained in the piping or equipment to be hot tapped

Introduction PETROBRAS Technical Standards are prepared by Working Groups - WG (consisting specialized of Technical Collaborators from Company and its Subsidiaries), are commented by Company Units and its Subsidiaries, are approved by the Authoring Subcommittees - SCs (consisting of technicians from the same specialty, representing the various Company Units and its Subsidiaries), and ratified by the Executive Nucleus (consisting of representatives of the Company Units and its Subsidiaries).

E ENGLISH 05 / 2011 24 Annex A - Figures Legend: 1) Driver units 2) Equipment shell 3) Adapters 4) Cutting tool 5) Service valves 6) Drain and relief valves 7) Stoppel service valves N 5 4 M 7 3 1 2 1 6 Figure A.1 - Typical Drawing of a Hot Tapping Equipment -PUBLICN- 2163 REV.

NOTE 3 All linear dimensions, in millimeters.

e Certificação de Inspetores de Soldagem; ISO 3183:2007 - Petroleum and Natural Gas Industries - Steel Pipe for Pipeline Transportation Systems; API 510:2006 - Pressure Vessel Inspection Code: In-Service Inspection, Rating, Repair, and Alteration; API 570:2009 - Piping Inspection Code: In-Service Inspection, Rating, Repair, and Alteration of Piping Systems; API RP 579-1:2007 - Fitness-for-Service; API RP 2201:2003 - Safe Hot Tapping Practices in the Petroleum &amp; Petrochemical Industries;

NOTE The welding without flow is possible in several cases, and shall be analyzed case by case.

cooling rate temperature range for time unit 3.17 hot tapping drilling technique, with hole saw and orbit, on in-service piping, pipeline or equipment, through a previously installed connection using specific equipment (HTM - Figure A.1 of Annex A) and without operational shutdown 3.18 cold crack cracks that occur in ferritic steels at temperatures below 100 ºC due to three factors, which are: fragile microstructure (normally martensite), tensile residual stress and presence of hydrogen in the

Ferritic Steels For welding on ferritic steels the following additional requirements shall be observed: a) in operational or climatic conditions that favor superficial humidity deposition, the use of pre-heating is recommended, even if it has not been required by the welding procedure, using oxidant flame with LPG tank (maximum temperature of 60 ºC); [Recommended Practice] NOTE 1 Heating torch (oxygen and propane or acetylene) may be used when pre-heating temperatures up to 80 ºC are required.

NOTE 1 In case of the body or responsible for Engineering (Design) is nonexistent, the meeting shall be held by the others, consulting the existent technical documentation.

approved by employee assigned for acting in the welding area of the unit; on behalf of the Contractor, the welding documentation shall be executed by welding inspector with Certification by the Brazilian System of Qualification and Certification (SNQC), according to ABNT NBR 14842:2003, as welding inspector level 2, in design standard applicable to the work 3.13 responsible for the hot tapping and stopple supervision PETROBRAS’ or the Contractor’s employee with legal competency for supervising

NOTE 3 In case of welding application directly on the piping or equipment body (buttering or external fill with weld metal) and for thickness less than 12.7 mm, the drilling risk shall be checked in accordance with NOTE 2.

E ENGLISH 05 / 2011 27 hitg-strength steel chain (B) Tensioned adjusting system Duct Hydraulic jack Hydraulic jack High-strength steel chain Wood support Wood support Connection or structural repair (A) Untensioned adjusting system Duct Figure A.5 - Types of Binding Systems Using Hydraulic Jack and Current -PUBLICN- 2163 REV.

Sealing and building materials of the machine shall be compatible with the products contained in the piping, pipeline or equipment. 8.3.4

In case of existing discontinuities, execute engineering study in order to enable execution of the work in the place or define relocation when possible; f) check existence of ovalisation and straightness of the pipeline or piping in order to minimize opening at the circumferential weld root of split sleeve and accessories for hot tapping and stopple.

sealing joint and bolts to be used, in accordance with the equipment, piping or pipeline standard (such as: standardized connections, beveled ends, t-split, wind ring and nozzles); NOTE The connection shall be considered temporarily, if it does not comply with the required standardization. b) prepare drawings or drafts of the connection to be installed; c) define the hydrostatic test pressure of the connections, based on the installation project data, according to Annex B; d) perform the welding

access for entrance and exit of the working place; in case of buried pipeline, provide a ditch with enough size to allow the welder or welders to have suitable access to the weld place, especially at the overhead region; i) provide efficient mechanical ventilation, suitable lighting and escape routes permanently clear in places below the ground level (diggings, wells, galleries) where welding works take place; j) keep, during the entire performance of the works, a supervisor responsible

Chemical analysis through wet chemistry or through Optical Emission Spectroscopy equipment: — Equation 1 for carbon less or equal to 0.12 %: CEpcm C Si Mn Cu Ni Cr Mo V 5B 30 20 20 60 20 15 10          — Equation 2 for carbon over 0.12%: 15 Cu Ni 5 Cr Mo V 6 CEIIW C Mn        NOTE When it is not possible, we shall appeal to the maximum CE of the certificate or specification of manufacture standard of material, with previous approval from the work inspection and professional

The upstream hot tapping of rotating equipment or automatic control valves shall be avoided, unless such equipment is protected from the waste produced by the cuts with filters or insulation basket, or tools suitable for its retention are used. 8.1.9

Inspection Check the physical conditions of the facilities prior to works execution, guarantee that materials are suitable for the technical specifications and ensure that the procedures comply with this Standard’s requirements. 4.2.9

The welding on equipment, piping and pipelines containing hydrocarbons, such as natural gas, oil, diesel oil, propane, naphtha, gasoline, LPG (Liquefied Petroleum Gas), anhydrous and hydrous alcohol and MTBE (Methyl-Tertiary-Butyl Ether), may be performed in the majority of situations regularly faced in refineries, storage terminals and pipelines of the company.

E ENGLISH 05 / 2011 4 Figure A.6 - Typical Drawing of Groove with built-in Backing for Longitudinal Welding of Split Sleeve28 Figure A.7 - Deposition Sequence to Be Used in the Welding of Longitudinal Welds..........................

diggings, obstructions or any other adjacent piping or equipment, including the closeness of drains, as well as lines and valves where toxic products pass by; g) ensure that the valve is tested in compliance with API STD 598:2009; in case the block valve is gate type, total withdrawing of the gate shall be checked and that it is clear of any device which might block the use of cutting tool; h) provide suitable access for entrance and exit of the working place; in case of buried pipeline, provide

of Annex A) 3.11 responsible for the hot tapping and stopple operation PETROBRAS’ or the contractor’s employee, with professional education in the mechanical area, trained and with proven experience in hot tapping and stopple activities 3.12 responsible for the welding on behalf of PETROBRAS, for in-service welding, the welding documentation shall be approved by employee assigned for acting in the welding area of the unit; on behalf of the Contractor, the welding documentation shall be executed

   — Equation 2 for carbon over 0.12%: 15 Cu Ni 5 Cr Mo V 6 CEIIW C Mn        NOTE When it is not possible, we shall appeal to the maximum CE of the certificate or specification of manufacture standard of material, with previous approval from the work inspection and professional responsible for the welding. b) check, in cases with history of crust, (like calcium carbonate and barium sulfate), whether there is formation of deposits inside the piping that might interfere in the flow

Ferritic Steels ...............................................................................................................

29 Figure A.8 - Deposition Sequence to be Used in the Welding of Circumferential Welds of Split Sleeve30 Figure A.9 - Typical Deposition Sequence of the Buttering Pass and Temper Bead ...........................

26 Figure A.4 - Typical Regions of Cold Crack Emergence.......................................................................

if the concentrations and temperatures provided by the project are such that the manufacture specifications demand thermal treatment after welding, or by the raise of corrosiveness (corrosion risk) under fluid stress due to the temperature reached inside because of the welding; e) acetylene, ethylene, benzene and other unsaturated hydrocarbons or even polymers that might suffer exothermal and spontaneous decomposition under certain pressure and temperature combinations; f) hydrogen,

sealing joint and bolts to be used, in accordance with the equipment, piping or pipeline standard (such as: standardized connections, beveled ends, t-split, wind ring and nozzles); NOTE The connection shall be considered temporarily, if it does not comply with the required standardization. b) prepare drawings or drafts of the connection to be installed; c) define the hydrostatic test pressure of the connections, based on the installation project data, according to Annex B; d) perform the welding

Responsible for the Operating Unit..............................................................................

The weld reinforcement on the crossover of in-service welds shall be removed. 6.2.1.13

Testing - Ultrasonic in Welds; PETROBRAS N-1596 - Non-Destructive Testing - Penetrant Testing; PETROBRAS N-1597 - Non-Destructive Testing - Visual Testing; PETROBRAS N-1598 - Ensaios Não Destrutivos - Partículas Magnéticas; PETROBRAS N-1738 - Descontinuidades em Juntas Soldadas, Fundidos, Forjados e Laminados; PETROBRAS N-2036 - Soldagem Subaquática; PETROBRAS N-2162 - Work Permit; PETROBRAS N-2301 - Preparation of the Welding Technical Documentation; PETROBRAS N-2349 - Safety in Welding and

NOTE The professional responsible for welding shall consider, in the welding process selection, the particularities of each process, like thermal contribution, penetration and deposition rate. 6.2.1.6

If a decision is taken not to follow the requirement (“non-conformity” to this Standard) it shall be based on well-founded economic and management reasons, and be approved and registered by the Department of PETROBRAS that uses this Standard.

Welding on regions with dents, furrows, crimp segments and grooves shall not be performed. 6.2.1.12

Every work of welding execution shall be supervised by a level 1 welding inspector. 6.2.1.9

of the expected weld, avoiding contact of the electrode or of parts that are not insulated with the external surface of the equipment, piping or pipeline; d) in split sleeve welding the two longitudinal welds shall be first performed, in a simultaneous manner, and with such arrangement of the passes that minimizes at most the warping displacement effect; e) the circumferential welds of closure shall be performed after the longitudinal ones, one at each time; NOTE The welding sequence of

NOTE The welding without flow is possible in several cases, and shall be analyzed case by case.

26 Figure A.5 - Types of Binding Systems Using Hydraulic Jack ..............................................................

if the concentrations and temperatures provided by the project are such that the manufacture specifications demand thermal treatment after welding, or by the raise of corrosiveness (corrosion risk) under fluid stress due to the temperature reached inside because of the welding; e) acetylene, ethylene, benzene and other unsaturated hydrocarbons or even polymers that might suffer exothermal and spontaneous decomposition under certain pressure and temperature combinations; f) hydrogen,

E ENGLISH 05 / 2011 25 (D) Flanged connection with reinforcement sleeve for hot tapping services (E) threaded or welded connections 5 1/4" Mechanic connector Double gutter with split sleeve (A) Accessories for structural repair service (B) Welded branch with no reinforcement Backing plates External filling with weld metal Plug (c) Welded branch with reinforcement ring Figure A.2 - Typical Accessories -PUBLICN- 2163 REV.

A.2 of Annex A) 3.2 CEIIW equivalent carbon according to formula of the “International Institute of Welding” (see ISO 3183:2007) 3.3 CEpcm equivalent carbon according to formula of Ito-Bessyo (see ISO 3183:2007) 3.4 equipment element of industrial plant or of production or oil storage facility, its derivatives and others, such as: tank, pressure vessel, derrick and heat exchanger 3.5 Hot Tapping Machine - HTM equipment used for executing drilling on in-service equipment, piping and

1 Scope 1.1 This Standard establishes the conditions for the execution of works involving connections installation and structural repairs, execution of welding and hot tapping on equipment, industrial piping and pipelines (inland or underwater), which are in-service (pressurized with or without flow, with product or its waste).

NOTE 1 In case of the body or responsible for Engineering (Design) is nonexistent, the meeting shall be held by the others, consulting the existent technical documentation.

compressed air; c) peroxides, chlorine or other chemicals which can violently decompose or become dangerous in contact with the welding heat; d) caustic substances, amines, nitrates and acids, if the concentrations and temperatures provided by the project are such that the manufacture specifications demand thermal treatment after welding, or by the raise of corrosiveness (corrosion risk) under fluid stress due to the temperature reached inside because of the welding; e) acetylene, ethylene,

14 6.2 Welding Works .....................................................................................................................

If a decision is taken not to follow the requirement (“non-conformity” to this Standard) it shall be based on well-founded economic and management reasons, and be approved and registered by the Department of PETROBRAS that uses this Standard.

E ENGLISH 05 / 2011 26 3 2 1 WM HAZ Drilling Figure A.3 - Welding Arc Penetration up to the Piping or Pipeline Hole 1 - Crack at the rope's edge 2 - Crack below the hope 3 - Crack at the root 4 - Cross crack relative to the rope (A) Angled joint 2 1 WM HAZ 3 (B) Top joint HAZ 4 WM 2 1 Figure A.4 - Typical Regions of Cold Crack Emergence -PUBLICN- 2163 REV.

2: Alternative Rules for Construction of Pressure Vessels; ASME BPVC Section IX:2010 - Boiler and Pressure Vessel Code - Section IX - Qualification Standard for Welding and Brazing Procedures, Welders, Brazers, and Welding and Brazing Operators - Welding and Brazing Qualifications; AWS A 3.0:2001 - Welding Terms and Definitions; BSI BS 7910:2005 - Guide on Methods for Assessing the Acceptability of Flaws in Metallic Structures; WRC Bulletin 537:2010 - Local Stresses in Spherical and

leakage (see Figure A.3 of Annex A) 3.9 stopple Intervention in the system with or without operational shutdown with or without flow deviation of the pipeline or piping 3.10 structural repair steel stiffener, compatible with the base metal, installed through welding (such as, split sleeve, overlapped reinforcing element, filling with weld, mechanical connector) in a defective area of the in-service equipment, piping or pipeline, in order to restore its mechanical resistance due to the design

E ENGLISH 05 / 2011 4 Figure A.6 - Typical Drawing of Groove with built-in Backing for Longitudinal Welding of Split Sleeve28 Figure A.7 - Deposition Sequence to Be Used in the Welding of Longitudinal Welds..........................

Recommended Practice: A provision that may be adopted under the conditions of this Standard, but which admits (and draws attention to) the possibility of there being a more adequate alternative (not written in this Standard) to the particular application.

NOTE The extent of maximum progress of the cutting tool shall be carefully calculated in order to ensure that the hot tapping stops within the dimensional limits, that the cut is suspended before the cutting tool hits the opposite side of the hot tapped piping, pipeline or equipment, or even its side part or weld, and that the cutting, removed from the plate, may be retracted enough to allow the free closure of hot tapping valve.

The welding on equipment, piping and pipelines containing hydrocarbons, such as natural gas, oil, diesel oil, propane, naphtha, gasoline, LPG (Liquefied Petroleum Gas), anhydrous and hydrous alcohol and MTBE (Methyl-Tertiary-Butyl Ether), may be performed in the majority of situations regularly faced in refineries, storage terminals and pipelines of the company.

Cutting Works; PETROBRAS N-2726 - Terminologia de Dutos; ABNT NBR 14842:2003 - Critérios para a Qualificação e Certificação de Inspetores de Soldagem; ISO 3183:2007 - Petroleum and Natural Gas Industries - Steel Pipe for Pipeline Transportation Systems; API 510:2006 - Pressure Vessel Inspection Code: In-Service Inspection, Rating, Repair, and Alteration; API 570:2009 - Piping Inspection Code: In-Service Inspection, Rating, Repair, and Alteration of Piping Systems; API RP 579-1:2007 -

permanently clear in places below the ground level (diggings, wells, galleries) where welding works take place; j) keep, during the entire performance of the works, a supervisor responsible for the services execution (connection installation, welding and hot tapping), meeting the following requirements: — carry communication equipment (such as radio, mobile phone), in touch with the operation and security; — be able to order prompt shutdown of the services in case of occurring any deflection

Introduction PETROBRAS Technical Standards are prepared by Working Groups - WG (consisting specialized of Technical Collaborators from Company and its Subsidiaries), are commented by Company Units and its Subsidiaries, are approved by the Authoring Subcommittees - SCs (consisting of technicians from the same specialty, representing the various Company Units and its Subsidiaries), and ratified by the Executive Nucleus (consisting of representatives of the Company Units and its Subsidiaries).

NOTE In equipment, piping and pipelines which are cladded or cased with the following materials: glass, lead, refractory material, polymers, coating internal casing or with superficial treatment, (such as: plating and aluminium plating), the degradation effect of the casing during the welding operation shall be considered.

NOTE In equipment, piping and pipelines which are cladded or cased with the following materials: glass, lead, refractory material, polymers, coating internal casing or with superficial treatment, (such as: plating and aluminium plating), the degradation effect of the casing during the welding operation shall be considered.