Production or Christmas Tree Valves

[xixilizerone]

Hi Everyone .... this is my first posting. For SCSSV (or TRSV) the allowable leak rat eis according to API RP14B. However for tree valves I don't think there is any API or ISO guidelines. Folks still use API RP14B for tree valves which O strongly believe is not correct because of the small volume downstream of the valve. What is the current practice may I know that is being use by your company or operators?

Regards

[inconel]

Thanks