API 602 vs API 600

[Joe2221]

Hello,

I have an application where a client has both API 602/600 gate valves in their specification. It seems as though most valve manufacturers prefer to offer forged gate valves per API 602 when size is below 2" NPS. What should I be comparing when considering whether a small bore gate valve be designed per API 602 or API 600? This is H2S service and valves must be meet NACE requirements.

TIA.

 

[Krausen]

Go with API602 if you can. Forged valves (API602) are almost always better than cast valves (API600), everything else being equal. Go with Trim #5 NACE-certified for H2S service.