ITEM   STANDARD
Drilling   Q/OHAD006-2004, YB/T5052
Oil field   API SPEC 5CT
Boiler   GB3087, GB5310, ASME SA-106, ASME SA -192M,

ASME SA - 209M, ASME SA -210M, ASME SA -

213M, ASME SA -335M, DIN17175, JIS G 3461
Liquid transportation  GB/T8163, ASTM A 53M, ASTM A 106
Conduit   API SPEC 5CT