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97026 EXTENDED LABORATORY TESTING OF TYPE 316 COMPRESSION FlTTINGS FOR SOUR SERVICE

Picture for 97026 EXTENDED LABORATORY TESTING OF TYPE 316
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Product Number: 51300-97026-SG
ISBN: 97026 1997 CP
Author: M J Schofield, A Nairn
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Previous tests showed type 316 stainless compression fittings can crack when exposed to NACE TM0I 77 solution at elevated temperatures for 30 days. Following up this finding, one-month, three-month and twelve month tests have been conducted on type 316 compression fittings and instrumentation tubing in order to assess their suitability for sour service. Loops were constructed, containing a total of over three hundred fittings from four manufacturers and filled with sour fluids comprising high chloride content solutions. They were pressurised to 50 bara (5MPa) with CO2 and H2S partial pressures in the range 0-0.8 bara (8kPa) and maintained at temperatures in the range 60- 120°C . The tests showed that even in mildly sour conditions, at elevated service temperatures -cracking can occur and that the threshold H2S partial pressure decreases with increasing temperature. Keywords sulfide stress cracking, austenitic stainlesssteels, compression fittings.
Previous tests showed type 316 stainless compression fittings can crack when exposed to NACE TM0I 77 solution at elevated temperatures for 30 days. Following up this finding, one-month, three-month and twelve month tests have been conducted on type 316 compression fittings and instrumentation tubing in order to assess their suitability for sour service. Loops were constructed, containing a total of over three hundred fittings from four manufacturers and filled with sour fluids comprising high chloride content solutions. They were pressurised to 50 bara (5MPa) with CO2 and H2S partial pressures in the range 0-0.8 bara (8kPa) and maintained at temperatures in the range 60- 120°C . The tests showed that even in mildly sour conditions, at elevated service temperatures -cracking can occur and that the threshold H2S partial pressure decreases with increasing temperature. Keywords sulfide stress cracking, austenitic stainlesssteels, compression fittings.
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