Wellhead Valves Design
When specifying or designing valves, reference should be made to the information contained in the Operating Envelope for that particular well.
All valves purchased by must at least meet the standards set in API 6A PSL 1, 2, 3 or 4 and in several areas it must exceed those standards Cases where the standards are exceeded are specialised exceptional cases. The preferred route is to purchase to API 6A latest edition at the PSL-3, PR-2 level.
End connections
For safety reasons valves or pipe fittings with screwed connections are not . . .