Thanks Mogens
I have looked in API 6A. It has specifications for wellhead equipment including the SSV, but it does not provide recommendations on what can be used as the SSV wing valve (termed "secondary wellhead equipment").
I guess what I am looking for is a code of practice or...
Can anyone please advise whether any codes or standards prohibit the use of an API 6D ANSI600#RFF ball valve as a wellhead wing shutdown valve. There is an upstream gate type manual wing valve rated the same as the Xmas tree at 5000psi. A transition piece will be used to get from 2 1/16"...