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Drilling riser systems can be excluded from sour service requirements per ISO-15156?

asked Jul 9, 2014 in Drilling by josvanden (2,940 points)
As per ISO-15156-2:2009 Table 1, Drilling riser systems can be excluded from sour service requirements. Can someone comment?

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answered Jul 9, 2014 by antonjoh (2,870 points)
The inner and outer drilling riser should be designed for sour service as "Materials to use in H2S containing environments in oil and gas production." All carbon or low alloy steel should consider sulphide stress cracking (SSC) region 3 irrespective of the service conditions.

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