Unlike B31.4, the stress check in B31.8 does not differentiate between restraint and unrestraint pipeline. Because of this, stress analysis for buried pipeline using B31.8 can produce favourable results which may not pass under B31.4.

I am very concern with using B31.8 for buried restraint gas pipeline. Is this code suitable for such application ?

Has anyone got previous similiar experience with with using B31.8 in buried restraint condition under high pressure and temperature?