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Sour Service Grades 

Sour Service Grades

Sour service grades for tubing and casing to be used in wells where H2S is present. The threshold stresses guaranteed have been determined according to method A of NACE TM0177 standard.

Name Y.S. range
(ksi-MPa) 		U.T.S. min.
(ksi-MPa) 		HRC value Threshold stress min. Pipe inspection Coupling colour code
VM 80 SS 80 (552) - 95 (655) 95 (655) ≤ 22 90% SMYS A full length non destructive inspection is performed in accordance with API 5CT for external and internal, longitudinal and transverse defects with a standard notch depth equal to 5% of the specified wall thickness. VM 80 SS
VM 90 S 90 (621) - 105 (724) 100 (690) ≤ 24 85% SMYS VM 90 S
VM 90 SS 90 (621) - 105 (724) 100 (690) ≤ 24 90% SMYS VM 90 SS
VM 95 S 95 (655) - 110 (758) 105 (724) ≤ 25 85% SMYS VM 95 S
VM 95 SS 95 (655) - 110 (758) 105 (724) ≤ 25 90% SMYS VM 95 SS
VM 100 SS 100 (690) - 115 (792) 110 (758) ≤ 28 85% SMYS VM 100 SS
VM 110 SS 110 (758) - 125 (862) 120 (828) ≤ 30 85% SMYS VM 110 SS

Deep well grades for casing: a wide range of wall thickness and diameters is available on request.

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