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[AMENDMENTS/SUPPLEMENTS TO ASTM A312-19]
☆ 1.Add: Pipe with a wall thickness ＞6.4 mm[0.25 in.] shall be fumished seamless,unless otherwise approved by the principal.
2.Modify to read:Welded pipe shall be made using the electric fusion welding process,with no addition of filler metal,in accordance with Table 302.3.4 pf ASME B31.3.Welded pipes shall be produced with only a single longitudinal weld seam.
3.Add: Any cold working shall be done before the final heat treatment.
4.Replace by: The pipe shall be free of scale and contaminating exogenous iron particles.Pickling shall be done in accordance with ASTM A380(de-scaled and acid cleaned).Pickling,blasting,or surface finishing is not required when pipe is bright annealed.
☆ Add: Heat treatment procedures shall be subject to statistical process control to ensure that the final material properties comply with the material specification and this MESC SPE.The process control data and related periodic qualitu control checks shall be documented.
☆ Add: If a stabilised heat treatment is specified,the pipe shall be given a stabilising heat treatment in accordance with supplementary requirement S6 within a temperature range of 870℃ to 900℃(1600 °F to 1650 °F) for 4 hours subsequent to the solution heat treatment.
Alternatively,the Manufacturer may submit a stabilisation heat treatment procedure for approval by the principal,and supplementary requirement S7 shall apply.
☆ Add: For pipe ordered to Grade TP316,the carbon content shall not exceed 0.035%.
☆ Add: Austenitic stainless steels shall be capable of passing an intergeanular corrosion test in accordance with supplementary requirement S7(testing to ISO 3651-2 method A may be performend in lieu of ASTM A262 Practice E).The frequency of this test shall be sufficient for the manufactuier to assure that all tests would be successful if subsequently performed.If periodic data are not available,then an interfranular corrosion test shall be performed for each heat in the purchase order.
☆ Add: Pipe ordered to Grade UNS S31254 shall be subject to a ferric chloride test in accordance with ASTM G48,Method A. The test temperature shall be 50 ℃ [122°F] and the exposure time shall be 24 hours.Test specimens shall be in the as-delivered condition.The test shall expose the external and internal surfaces and a cross section surface inclding the weld zone in full wall thickness.No pitting is acceptable at the internal or external surfaces at 20 times magnification.The weight loss shall be ＜4.0g/m2(0.013 oz/ft2)
☆ Add: For longitudinally welded pipe ordered in sizes ≥ DN 150[NPS 6],both hydrostatic testing and nondestructive electric testing shall be performed.
☆ Add: Hydrostatic testing shall be performed after heat treatment.
Hydrotesting shall be performed with water containing no more than 50 ppm chloride.
The pipe shall be dry before any end clisures are installed.
☆ Modify purchaser to read principal.
☆ Add: The entire length of welds of pipe furnished by the electric fusion welding process as specified in clause 6.1.3 shall be 100% examined by radiography in accordance with supplementary requiremeny S5.
Where'' LNG RETALL/LNG BUNKERING ONLY'' is specified in the MESC buying description,100% Eddy current testing in lieu of 100% examination by radiography is acceptable.
Eddy current testing shall be executed as per ASTM E426,with acceptance criteria as per ASTM A999,section 22.3.8.5 and 22.3.10.(A weld joint quality factor of 0.8 applies for these components and have been taken into account for the wall thickness calculations in the aoolicable LNG retail and bunkering piping classes).
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