FIFTEENTH SCHEDULE PART A OIL AND GAS INDUSTRY STANDARDS ESTABLISHED BY THE STANDARDS AUTHORITY NO.        Paragraph        STD REF NO        TITLE        1.                GS ISO/TR 10400:2007        Petroleum and natural gas industries — Equations and calculations for the properties of casing, tubing, drill pipe and line pipe used as casing or tubing.        2.                GS  ISO 10407-2:2008         Petroleum and natural gas industries— Rotary drilling equipment— Part 2: Inspection and classification of used drill stem elements.        3.                GS ISO 10407-2:2008Cor. 1:2009        Petroleum and natural gas industries— Rotary drilling equipment— Part 2: Inspection and classification of used drill stem elements. TECHNICAL CORRIGENDUM 1.        4.                GS ISO 10414-1:2008        Petroleum and natural gas industries— Field testing of drilling fluids— Part 1: Water-based fluids.        5.                GS ISO 10414- 1:2002        Petroleum and natural gas industries— Field testing of drilling fluids— Part 2: Oil-based fluids.        6.                GS ISO 10416:2008        Petroleum and natural gas industries— Drilling fluids— Laboratory testing.        7.                GS ISO 10417:2004        Petroleum and natural gas industries— Subsurface safety valve systems— Design, installation, operation and redress.        8.                GS ISO 10418:2003        Petroleum and natural gas industries— Offshore production installations— Analysis, design, installation and testing of basic surface process safety systems.        9.                GS ISO 10418:2003/Cor. 1:2008        Petroleum and natural gas industries—Offshore production installations—Analysis, design, installation and testing of basic surface process safety systems. TECHNICAL CORRIGENDUM 1.        10.                GS ISO 10423:2009        Petroleum and natural gas industries — Drilling and production equipment — Wellhead ad Christmas tree equipment.        11.                GS ISO 10424-1:2004        Petroleum and natural gas industries— Rotary drilling equipment— Part 1: Rotary drill stem elements.        12.                GS ISO 10424-2:2007        Petroleum and natural gas industries — Rotary drilling equipment —Part 2: Threading and gauging of rotary shouldered thread connections.        13.                GS ISO 10426-1:2009        Petroleum and natural gas industries — Cements and materials for well cementing — Part 1: Specification        14.                GS ISO 10426-2:2003        Petroleum and natural gas industries — Cements and materials for well cementing — Part 2: Testing of well cements.        15.                GS ISO 10426-2:2003/Cor.1:2006        Petroleum and natural gas industries — Cements and materials for well cementing — Part 2: Testing of well cements. TECHNICAL CORRIGENDUM 1.        16.                GS ISO 10426-2:2003/Amd. 1:2005        Petroleum and natural gas industries — Cements and materials for well cementing — Part 2: Testing of well cements. AMENDMENT 1: Water-wetting capability testing.        17.                GS ISO 10426-3:2003        Petroleum and natural gas industries — Cements and materials for well cementing — Part 3: Testing of deepwater well cement formulations        18.                GS ISO 10426-4:2004        Petroleum and natural gas industries — Cements and materials for well cementing — Part 4: Preparation and testing of foamed cement slurries at atmospheric pressure.        19.                GS ISO 10426-5:2004        Petroleum and natural gas industries — Cements and materials for well cementing — Part 5: Determination of shrinkage and expansion of well cement formulations at atmospheric pressure.        20.                GS ISO 10426-6:2008        Petroleum and natural gas industries — Cements and materials for well cementing — Part 6: Methods for determining the static gel strength of cement formulations.        21.                GS ISO 10427-1:2001        Petroleum and natural gas industries — Equipment for well cementing — Part 1: Casing bow-spring centralizers.        22.                GS ISO 10427-2:2004        Petroleum and natural gas industries — Equipment for well cementing — Part 2: Centralizer placement and stop-collar testing        23.                GS ISO 10427-3: 2003        Petroleum and natural gas industries —Equipment for well cementing — Part 3: Performance testing of cementing float equipment        24.                GS ISO 10432:2004        Petroleum and natural gas industries — Downhole equipment — Subsurface safety valve equipment.        25.                GS ISO 10437:2003        Petroleum, petrochemical and natural gas industries — Steam turbines — Special-purpose applications.        26.                GS ISO 10438-1:2007        Petroleum, petrochemical and natural gas industries — Lubrication, shaft-sealing and control-oil systems and auxiliaries — Part 1: General requirements.        27.                GS ISO 10438-2:2007        Petroleum, petrochemical and natural gas industries — Lubrication, shaft-sealing and control-oil systems and auxiliaries — Part 2: Special-purpose oil systems.        28.                GS ISO 10438-3:2007        Petroleum, petrochemical and natural gas industries — Lubrication, shaft-sealing and control-oil systems and auxiliaries — Part 3: General-purpose oil system.        29.                GS ISO 10438-4:2007        Petroleum, petrochemical and natural gas industries — Lubrication, shaft-sealing and control-oil systems and auxiliaries — Part 4: Self-acting gas seal support systems.        30.                GS ISO 10441:2007        Petroleum, petrochemical and natural gas industries — Flexible couplings for mechanical power transmission — Special-purpose applications.        31.        Par. 1.3, 1.5, 1.9, 1.10(a), 1.11(a), 2.6        GS ISO 11960:2004        Petroleum and Natural Gas Industries-Steel pipes for use as casing or tubing for wells.        32.        Par.1.3, 1.5, 1.9, 1.10(a), 1.11(a)        GS ISO 11960:2004/Cor, 1:2006        Petroleum and Natural Gas Industries-Steel pipes for use as casing or tubing for wells. TECHNICAL CORRIGENDUM 1.        33.                GS ISO 11961:2008        Petroleum and natural gas industries – Steel drill pipe.        34.                GS ISO 11961:2008/Cor. 1:2009        Petroleum and natural gas industries –Steel drill pipe. TECHNICAL CORRIGENDUM 1.        35.                GS ISO 13500:2008        Petroleum and natural gas industries — Drilling fluid materials — Specifications and tests.        36.                GS ISO 13500:2008/Cor 1:2009        Petroleum and Natural gas industries — Drilling fluid materials — Specifications and tests. TECHNICAL CORRIGENDUM 1.        37.                GS ISO 13501:2005        Petroleum and natural gas industries — Drilling fluids — Processing systems evaluation        38.                GS ISO 13503-1:2003        Petroleum and natural gas industries — Completion fluids and materials — Part 1: Measurement of viscous properties of completion fluids        39.                GS ISO 13503-2:2006        Petroleum and natural gas industries —Completion fluids and materials — Part 2: Measurement of properties of proppants used in hydraulic fracturing and gravel-packing operations        40.                GS ISO 13503-2:2006/Amd. 1:2009        Petroleum and natural gas industries — Completion fluids and materials — Part 2: Measurement of properties of proppants used in hydraulic fracturing and gravel-packing operations. AMENDMENT 1: Addition of Annex B: Proppant specification        41.                GS ISO 13503-3:2005        Petroleum and natural gas industries — Completion fluids and materials — Part 3: Testing of heavy brines        42.                GS ISO 13503-3:2005/Cor. 1:2006        Petroleum and natural gas industries — Completion fluids and materials — Part 3: Testing of heavy brines. TECHNICAL CORRIGENDUM 1        43.                GS ISO 13503-4:2006        Petroleum and natural gas industries — Completion fluids and materials — Part 4: Procedure for measuring stimulation and gravel-pack fluid leak off under static conditions        44.                GS ISO 13503-5:2006        Petroleum and natural gas industries — Completion fluids and materials — Part 5: Procedures for measuring the long-term conductivity of proppants        45.                GS ISO 13533:2001        Petroleum and natural gas industries — Drilling and production equipment – Drill-through equipment        46.                GS ISO 13533:2001/Cor. 1:2005        Petroleum and natural gas industries — Drilling and production equipment – Drill-through equipment. TECHNICAL CORRIGENDUM 1        47.                GS ISO 13534:2000        Petroleum and natural gas industries — Drilling and production equipment — Inspection, maintenance, repair and remanufacture of hoisting equipment        48.                GS ISO 13535: 2000        Petroleum and natural gas industries — Drilling and production equipment — Hoisting equipment        49.        Par. 1.16, 3.27, 3.28(b), 3.30, 3.4, 3.4(b), 4.13, 11.26 to 11.28, 12.30        GS ISO 13623:2009        Petroleum and natural gas industries — Pipeline transportation systems        50.                GS ISO 13624-1:2009        Petroleum and natural gas industries — Part 1: Design and operation of marine drilling riser equipment.        51.                GS ISO/TR 13624-2:2009        Petroleum and natural gas industries — Drilling and production equipment — Part 2: Deepwater drilling riser methodologies, operations, and integrity technical report.        52.                GS ISO 13625:2002        Petroleum and natural gas industries — Drilling and production equipment — Marine drilling riser ciouplings.        53.                GS ISO 13626:2003        Petroleum and natural gas industries — Drilling and production equipment — Drilling and well-serving structures.        54.                GS ISO 13628-1:2005        Petroleum and natural gas industries — Design and operation of subsea production systems — Part 1: General requirements and recommendations.        55.                GS ISO 13628-2:2006        Petroleum and natural gas industries — Design and operation of subsea production systems — Part 2: Unbounded flexible pipe systems for subsea and marine applications.        56.                GS ISO 13628-2:2006/Cor. 1:2009        Petroleum and natural gas industries—Design and operation of subsea production systemst— Part 2: Unbonded flexible pipe systems for subsea and marine applications. TECHNICAL CORIGENDUM 1.        57.                GS ISO 13628-3:2000        Petroleum and natural gas industries—Design and operation of subsea production systems— Part 3: Through flow line (TFL) systems.        58.                GS ISO 13628-5:2009        Petroleum and natural gas industries — Design and operation of subsea production systemst — Part 5: Subsea umbilicals.        59.                GS ISO 13628-6:2006        Petroleum and natural gas industries — Design and operation of subsea production systems — Part 6: Subsea production control systems.        60.                GS ISO 13628-7:2005        Petroleum and natural gas industries — Design and operation of subsea production system — Part 7: Completion/workpver riser systems.        61.                GS ISO 13628-8:2002        Petroleum and natural gas industries — Design and operation of subsea production systems — Part 8: Remotely Operated Vehicle (ROV) interfaces on subsea production systems.        62.                GS ISO 13628-8:2002/Cor. 1:2005        Petroleum and natural gas industries — Design and operation of subsea production systems — Part 8: Remotely Operated Vehicle (ROV) interfaces on subsea production systems. TECHNICAL CORRIGENDUM 1.        63.                GS ISO 13628-10:2005        Petroleum and natural gas industries — Design and operation of subsea production systems — Part 10: Specicification[sic] for bounded flexible pipe.        64.                GS ISO 13628-11:2007        Petroleum and natural gas industries — Design and operation of subsea production systems — Part 11: Flexible pipe systems for subsea and marine applications.        65.                GS ISO 13628-11:2007/Cor. 1:2008        Petroleum and natural gas industries —Design and operation of subsea production systems — Flexible pipe systems for subsea and marine applications. TECHNICAL CORRIGENDUM 1.        66.                GS ISO 13628:2009        Petroleum and natural gas industries — Design and operation of subsea production systems — Evaluation and testing of thread compounds for use with casing, tubing, line pipe and drill stem elements.        67.                GS ISO 13628:2000/Cor. 1:2005        Petroleum and natural gas industries — Evaluation and testing of thread compounds for use with casing, tubing, line pipe and drill stem elements. TECHNICAL CORRIGENDUM 1.        68.                GS ISO 13680:2008        Petroleum and natural gas industries— Corrosion-resistant alloy seamless tubes for use as casing, tubing and coupling stock—Technical delivery conditions.        69.                GS ISO 13703-8:2000        Petroleum and natural gas industries — Design and installation of piping sustems on offshore production platforms.        70.                GS ISO 13703:2000/Cor. 1:2002        Petroleum and natural gas industries — Design and installation of piping systems on offshore production platforms. TECHNICAL CORRIGENDUM 1.        71.                GS ISO 13704:2007        Petroleum and natural gas industries—Calculation of heater tube thickness in petroleum refineries.        72.                GS ISO 13704:2007/Cor. 1:2008        Petroleum, petrochemical and natural gas industries—Calculation of heater-tube thickness in petroleum refineries. TECHNICAL CORRIGENDUM 1.        73.                GS ISO 13706:2005        Petroleum, petrochemical and natural gas industries—Air-cooled heat exchangers.        74.        Par 4.23        GS ISO 13847:2000        Petroleum, petrochemical and natural gas industries—Pipeline transportation systems—Welding of pipelines.         75.        Par 4.23        GS ISO 13847:2000/Cor 1:2001        Petroleum, petrochemical and natural gas industries—Pipeline transportation systems—Welding of pipelines.        76.                GS ISO 14224:2006        Petroleum and natural gas industries—Collection and exchange of reliability and maintenance data for equipment.        77.                GS ISO 14310:2008        Petroleum and natural gas industries—Downhole equipment—Packers and bridge plugs.        78.        Par. 1.13 (a) 3.5 & 3.6        GS ISO 14313:2007        Petroleum and natural gas industries—Pipeline transportation systems – Pipeline valves.        79.                GS ISO 14313:2007/Cor. 1:2009        Petroleum and natural gas industries—Pipeline transportation systems-Pipeline valves. TECHNICAL CORRIGENDUM 1.        80.                GS ISO 14691:2008        Petroleum and natural gas industries—Flexible couplings for mechanical power transmission—General-purpose applications.        81.                GS ISO 146921:2002        Petroleum and natural gas industries—Glass-reinforced plastics (GRP) piping—Part 1: Vocabulary, symbols, applications and materials.        82.                GS ISO 14692-2:2002        Petroleum and natural gas industries—Glass reinforced plastics (GRP) piping Part 2: Qualification and manufacture.        83.                GS ISO 14692-2:2002/Cor. 1:2005        Petroleum and natural gas industries—Glass reinforced plastics (GRP) piping Part 2: Qualification and manufacture. TECHNICAL CORRIGENDUM 1.        84.                GS ISO 14692-3:2003        Petroleum and natural gas industries—Glass-reinforced plastics (GRP) piping – Part 3: System design.        85.                GS ISO 14692-2:2002/Cor. 1:2005        Petroleum and natural gas industries—Glass reinforced plastics (GRP) piping – Part 3: TECHNICAL CORRIGENDUM 1.        86.                GS ISO 14692-4:2002        Petroleum and natural gas industries—Glass reinforced plastics (GRP) piping – Part 4: Fabrication, installation and operation.        87.                GS ISO 14693:2003        Petroleum and natural gas industries—Drilling and well-serving equipment        88.        Par. 3.47 (c)        GS ISO 14723:2009        Petroleum and natural gas industries—Pipeline transportation systems-Subsea pipeline valves.        89.                GS ISO 15136-1:2009        Petroleum and natural gas industries—Progressing cavity pump systems for artificial lift – Part 1: Pumps.        90.                GS ISO 14692-2:2002        Petroleum and natural gas industries—Progressing cavity pump systems for artificial lift – Part 1: Pumps.        91.                GS ISO 15138:2007        Petroleum and natural gas industries—Offshore production installations-heating, ventilation and air-conditioning.        92.                GS ISO 15156-1:2009        Petroleum and natural gas industries—Materials for use in H2S-containing environments in oil and gas production – Part 1: General principles for selection of cracking-resistant materials.        93.                GS ISO 15156-2:2009        Petroleum and natural gas industries—Materials for use in H2S-containing environments in oil and gas production – Part 2: Cracking-resistant carbon and low-alloy steels, and the use of cast irons.        94.                GS ISO 15156-3:2009        Petroleum and natural gas industries —Materials for use in H2S-conataining environments in oil and gas production – Part 3: Cracking—resistant CRAs (corrosion-resistant alloys) and other alloys.        95.                GS ISO 15463:2003        Petroleum and natural gas industries-Field inspection of new casing tubing and plain-end drill pipe.        96.                GS ISO 15463:2003/Cor. 1:2009        Petroleum and natural gas industries—Field inspection of new casing, tubing and plain-end drill pipe. TECHNICAL CORRIGENDUM 1.        97.                GS ISO 1544:2000        Petroleum and natural gas industries —Offshore production installations-Requirements and guidelines for emergency response.        98.                GS ISO 1544:2000/Amd. 1:2009        Petroleum and natural gas industries— Offshore production installations –Requirements and guidelines for emergency response. AMENDMENT 1.        99.                GS ISO 15546:2007        Petroleum and natural gas industries—Aluminum alloy drill pipe.        100.                GS ISO 15547-1:2005        Petroleum, petrochemical and natural gas industries—Plate-type heat exchangers –Part 1: Plate-and-frame heat exchangers.        101                GS ISO 15547-2:2005        Petroleum, petrochemical natural gas industries—Plate-type heat exchangers – Part 2 : Brazed aluminum plate-fin heat exchangers.        102.                GS ISO 15589-1:2003        Petroleum and natural gas industries—Cathodic protection systems – Part 1: On-land pipelines.        103.                GS ISO 15589-2:2004        Petroleum and natural gas industries—Cathodic protection systems – Part 2: Offshore pipelines.        104.        Par. 1.13 (a)        GS ISO 15590-1:2009        Petroleum and natural gas industries—Cathodic protection systems-Part 1: Induction bends, fittings and flanges for pipeline transportation systems—Part 1: Induction bends        105        Par. 1.13 (a) 3.12, 3.14 (a)        GS ISO 15590-2:2003        Petroleum and natural gas industries—Induction bends, fittings and flanges for pipeline transportation systems – Part 2: Fittings.        106.                GS ISO 15590-3:2004        Petroleum and natural gas industries—Induction bends, fittings and flanges for pipeline transportation systems – Part 3: Flanges.        107.                GS ISO 15663-1:2000        Petroleum and natural gas industries—Life cycle costing- Part 1: Methodology        108.                GS ISO 15663-1:2000        Petroleum and natural gas industries—        109.                GS ISO 16708:2006        Petroleum and natural gas industries—Pipeline transportation systems – Reliability-based limit state methods.        110.                GS ISO 16812:2007        Petroleum, petrochemical and natural gas industries—Shell and tube heat exchangers.        111.                GS ISO 17078-1:2004        Petroleum and natural gas industries—Drilling and production equipment –Part 1: Side-pocket mandrels.        112.                GS ISO 17078-2:2007        Petroleum and natural gas industries—Drilling and production equipment – Part 2: flow-control devices for side-pocket mandrels.        113.                GS ISO 17078-2:2007/Cor. 1:2009        Petroleum and natural gas industries—Drilling and production equipment-Part 2: Flow-control devices for side-pocket mandrels. TECHNICAL CORRIGENDUM 1.        114.                GS ISO 17078-3:2009        Petroleum and natural gas industries—Drilling and production equipment- Part 3: Running tools, pulling tools and kick-over tools and latches for side-pocket mandrels.        115.                GS ISO 17776:2000        Petroleum and natural gas industries —Offshore production installations – Guidelines on tools and techniques for hazard identification and risk assessment.        116.                GS ISO 17824:2009        Petroleum and natural gas industries— Downhole equipment-Sand screens        117.                GS ISO 19900:2002        Petroleum and natural gas industries—General requirements for offshore structures        118.                GS ISO 19901-1:2005        Petroleum and natural gas industries—Specific requirements for offshore structures – Part 1: metocean design and operating considerations        119.                GS ISO 19901-2:2004        Petroleum and natural gas industries—Specific requirements for offshore structures – Part 2: Seismic design procedures and criteria.        120.                GS ISO 19901-4:2003        Petroleum and natural gas industries—Specific requirements for offshore structures – Part 4: Geotechnical and foundation design considerations        121.                GS ISO 19901-5:2003        Petroleum and natural gas industries—Specific requirements for offshore structures – Part 5: Weight control during engineering and construction.        122.                GS ISO 19901-6:2009        Petroleum and natural gas industries—Specific requirements for offshore structures – Part 6: Marine operations.        123.                GS ISO 19901-472005        Petroleum and natural gas industries—Specific requirements for offshore structures – Part 7 : Station keeping systems for floating offshore structures and mobile offshore units.        124.                GS ISO 19901:2007        Petroleum and natural gas industries—Fixed steel offshore structures        125.                GS ISO 19903:2006        Petroleum and natural gas industries—Fixed concrete offshore structures        126.                GS ISO 19903:2006        Petroleum and natural gas industries        127.                GS ISO 20815:2008        Petroleum and natural gas industries—Production assurance and reliability management        128.                GS ISO 21329:2004        Petroleum and natural gas industries—Pipeline transportation systems – Test procedures for mechanical connectors        129.                GS ISO 21809:2007        Petroleum and natural gas industries—External coatings for buried for submerged pipelines used in pipeline transportation systems- Part 2: Fusion-bonded epoxy coatings        130.                GS ISO 21809:2007/Cor. 1:2008        Petroleum and natural gas industries—External coatings for buried or submerged pipelines used in pipeline transportation systems – Part 2: Fusion-bonded epoxy coatings TECHNICAL CORRIGENDUM 1.        131.                GS ISO 21809-3:2008        Petroleum and natural gas industries—External coatings for buried or submerged pipelines used in pipeline transportation systems – Part 3: Field joint coatings.        132.                GS ISO 21809-4:2009        Petroleum and natural gas industries—External coatings for buried or submerged pipelines used in pipeline transportation systems – Part 4: Polythylene coatings (2-layer PE).        133.                GS ISO 23251:2006/Amd. 1:2008        Petroleum, petrochemical and natural gas industries—Pressure-relieving and depressuring systems.        134.                GS ISO 23251:2006/Cor. 1:2007        Petroleum, petrochemical and natural gas industries—Pressure-relieving and depressuring systems. AMENDMENT 1        135.                GS ISO 23936-1:2009        Petroleum, petrochemical and natural gas industries—Pressure-relieving and depressuring systems. TECHNICAL CORRIGENDUM 1        136.                GS ISO /TS 24817:2006        Petroleum, petrochemical and natural gas industries—Non-metallic materials in contact with media related to oil and gas production-Part 1: Themoplastics        137.                GS ISO 25457:2008        Petroleum, petrochemical and natural gas industries—Pressure-relieving and depressuring systems        138.                GS ISO 28300:2008        Petroleum, petrochemical and natural gas industries—Flare details for general refinery and petrochemical service        139.                GS ISO 28300:2008/Cor. 1:2009        Petroleum, petrochemical and natural gas industries—Venting of atmospheric and low-pressure storage tanks.        140.                GS ISO/TS 28300:2008/Cor. 1:2009        Petroleum, petrochemical and natural gas indusrites—Venting of atmospheric and low-pressure storage tanks.        141.                GS ISO/TS 29001:2007        Petroleum, petrochemical and natural gas industries—Sector-specific quality management systems – Requirements for product and service supply organizations.        142.        Par. 14. 12., 14.14, 14.20(i), 14.20(k), 14.20 (m), 14.22 (a), 14.23, 14.33, 14.35, 14.46, 14.53 (a), 14.173        ASME/ANSI B31.8s        Supplement ASME B31.8 on Managing System Integrity of Gas Pipelines        143.        Par. 2.17        PPT TR-3/2000        Policies and procedures for developing Hydrostatic Design Bases (HDB), Pressure Design Bases (PDB) and Minimum Required Strength (MRS).        144.        Par. 3.80, 5.13(a), 5.17(i), 5.17(ii), 5.17(iii)        ASTM SpecificationASTM D 2517:1979        Standard specification for reinforced epoxy resin gas pressure pipe and fittings.        145.        Par. 5.11 (b), 5.17 (c)        ASTM d 2513:1999        Standards Specification for Thermoplastic Gas Pressure Pipe, Tubing and Fittings        146.        Par. 5.8        ASME/ANSI B16.5:1977        Cast pipe flanges and flanged fittings        147.        Par. 5.19 (a)        ASTM D 638-1999        Standard Test Method for Tensile Properties of Plastic        148.        Par. 8.64        ASME/ANSI B31G        Manual for determining the remaining of corroded pipe-lines        149.        Par. 9.10 (c)        ASME/ANSI, MSS specifications        —        150.        Par. 11.26 to 11.28        API (RP) 1162 1st Edition (December        Public Awareness Programs for Pipeline Operators.        PART BSTEEL PIPE OF UNKNOWN OR UNLISTED SPECIFICATION(a) Bending Properties – For pipe 51 millimetres or less in diameter, a length of pipe must be cold bent through at least 90 degrees around a cylindrical mandrel that has a diameter 12 times the diameter of the pipe, without developing cracks at any portion and without opening the longitudinal weld.For a pipe of more than 51 millimetres in diameter the pipe must meet the requirements of the flattening test specified in this Schedule, except that the number of tests must at the least be equivalent to the minimum requirements of paragraph (d) to determine yield strength.(b) Weldability – A girth weld must be made in the pipe by a welder who is qualified under paragraphs 4.4 and 4.6 of the Fourth Schedule. The weld must be made under the most severe conditions under which welding will be allowed in the field and by means of the same procedure that will be used in the filed. On pipe more than 102 millimetres in diameter, at least one test weld must be made for each 100 lenghts of pipe. On pipe 102 millimetres or less in diameter, at least one test weld must be made for each 400 lengths of pipe. The weld must be tested in accordance with the standard specified in the Fifteenth Schedule. If the requirements of the standard specified in the Fifteenth Schedule cannot be met, weldability may be established by making chemical tests for carbon and manganese, and proceeding in accordance with the required standard specified in the Fifteenth Schedule. The same number of chemical tests must be made as are required for testing a girth weld.(c) Inspection – The pipe must be clean enough to permit adequate inspection. It must be visually inspected to ensure that it is reasonably round and straight and there is no defect which might impair the strength or tightness of the pipe.(d) Tensile Properties – If the tensile properties of the pipe are not known, the minimum yield strength may be taken as 166 megapascals or less, or the tensile properties may be established by performing tensile tests in accordance with the requirements specified in this Schedule. Every test specimen shall be selected at random and the following number of tests must be performed.Number of tensile tests — All sizes10 lengths or less:        1 set of tests for each length        11 to 100 lengths        1 set of tests for each 5 lengths, but not less than 10 tests.        Over 100 lengths        1 set of tests for each 10 lengths, but not less than 20 tests        If the yield-tensile ratio, based on the properties determined by those tests, exceeds 0.85, the pipe may be used only as provided in paragraph 1.7 of the First Schedule.PART CTRANSPORTATION OF NATURAL GAS BY PIPELINE: MINIMUM SAFETY STANDARDSTable E.II.1: Preventive and Mitigative Measures for Transmission Pipe lines Operating below 30% SMYS not in an HCA but in a Class 3 and 4 LocationThreat        Existing Requirements        Additional requirements Preventive and Mitigative Measures                Primary        Secondary                External Corrosion        Par. 8.3 to 8.8 – (General)Par. 8.9 and 8.10 – (Examination) Par. 8.11 to 8.15 – (External Coating)Par. 8.17 and 8.17[sic] – (Cathodic Protection) Par. 8.26 to 8.33 – (Monitoring),Par. 8.34 to 8.39 – (Electrical isolation),Par. 8.40 – (Test station)Par. 8.41 to 8.43 – (Test leads),Par. 8.44 and 8.45 – (Interference),Par 8.52 to 8.54 – (Atomspheric),Par. 8.55 to 8.57- (Atomspheric),Par. 8.61 and 8.62 – (Remedial),Par. 12.4 to 12.6 – (Patrol),Par. 12.7 and 12.8 –  (Leak survey),Par. 12.9 and 12.10 – (Repair B gen.)Par. 12.14 – (Repair B perm)        Par. 11.2 – (General Operation) Par. 11.14 and 11.15- (Surveillance)        For Cathodically Protected Transmission Pipeline:Perform semi-annual leak survey.For unprotected Transmission Pipelines or for Cathodically Protected Pipe where Electrical Surveys are impractical:Perform quarterly leak surveys        Internal Corrosion        Par. 8.46 to 8.49 –  (General Internal Corrossion),Par 8.50 and 8.51 – (Internal Corrosion monitoring),Par. 8.61 and 8.62 – (Remedial),Par. 12.4 to 12.6 – (Patrol),Par. 12.7 and 12.8 – (Leak survey),Par. 12.9 and 12.10 – (Repair B gen.)Par. 12.14-(Repair B perm)        Par. 11.2-(General Operation) Par. 11.14 and 11.15 - Surveillance)        Perform semi-annual leak surveys.        3rd  Party Damage        Par. 2.2-(Gen. Design),Par. 2.11 to 2.14- (Design factor),Par. 6.14 to 6.16- (Hazard protection.),Par. 6.36 to 6.40- (Cover),Par. 11.16 to 11.21 - (Damage Prevention),Par. 11.26 to 11.33 -(Public education),Par. 12.4 to 12.6- (Patrol),Par. 12.9 and 12.10 - (Repair B gen.)Par. 12.14 -(Repair B perm)        Par. 11.22 - (Emergency Plan.)        Participation in state one-call system,Use of qualified operator employees and contractors to perform marking and locating of buried structures and in direct supervision of excavation work, ANDEither monitoring of excavations near operator-s transmission pipelines, or bi-monthly patrol of transmission pipelines in class 3 and 4 locations. Any indications of unreported construction activity would require a follow-up investigation to determine if mechanical damage occurred.