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High Collapse Grades 

High Collapse Grades

High collapse grades for casing to be used in high pressure wells. As mechanical properties and pipe dimensions are major factors in collapse resistance, the following parameters have been optimised to guarantee high collapse pressures: D/t ratio, yield strength, ovality, wall thickness, residual stresses.

Name Y.S. range
(ksi-MPa) 		U.T.S. min.
(ksi-MPa) 		Collapse resistance Pipe inspection

Coupling colour code

VM 80 HC 80 (552) - 110 (758) 100 (690) The minimum guaranteed collapse pressures are available on request. 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. The wall thickness is measured by ultrasonic method. VM 80 HC
VM 95 HC 95 (655) - 125 (862) 110 (758) VM 95 HC
VM 110 HC 110 (758) - 140 (965) 125 (862) VM 110 HC
VM 125 HC 125 (862) - 150 (1034) 135 (931) VM 125 HC

High collapse and sour service grades for casing to be used in high pressure wells where H2S is present.

Name Y.S. range
(ksi-MPa) 		U.T.S. min.
(ksi-MPa) 		HRC value Threshold stress min. Collapse resistance Pipe inspection Coupling colour code
VM 80 HCS 80 (552) - 95 (655) 95 (655) ≤ 22 85% SMYS The minimum guaranteed collapse pressures are available on request. 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. The wall thickness is measured by ultrasonic method. VM 80 HCS
VM 80 HCSS 80 (552) - 95 (655) 95 (655) ≤ 22 90% SMYS VM 80 HCSS
VM 90 HCS 90 (621) - 105 (724) 100 (690) ≤ 24 85% SMYS VM 90 HCS
VM 90 HCSS 90 (621) - 105 (724) 100 (690) ≤ 24 90% SMYS VM 90 HCSS
VM 95 HCS 95 (655) - 110 (758) 105 (724) ≤ 25 85% SMYS VM 95 HCS
VM 95 HCSS 95 (655) - 110 (758) 105 (724) ≤ 25 90% SMYS VM 95 HCSS
VM 110 HCSS 110 (758) - 125 (862) 120 (828) ≤ 30 85% SMYS VM 110 HCSS

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

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