Raptor34,
My comment was API 1104 is not applicable to SS piping systems.
From API 1104 2005
1.1 SCOPE
This standard covers the gas and arc welding of butt, fillet,
and socket welds in carbon and low-alloy steel piping used in
the compression, pumping, and transmission of crude petroleum,
petroleum products, fuel gases, carbon dioxide, nitrogen
and, where applicable, covers welding on distribution
systems.
Which steel group does SS fall into - carbon or low alloy ?
Neither so it is not applicable,
Regards,
Shane