American Petroleum Institute

Specification for Verification Test of Wellhead Surface Safety Valves and Underwater Safety Valves for Offshore Service - First Edition; Errata - December 1996
 N SPEC 6AV1

Annotation

PURPOSE

The purpose of this specification is to establish requirements to:

a. Verify the basic PR1 standard service SSV/USV valve design.

b. Verify the basic SSV/USV actuator design.

c. Verify the basic PR2 sandy service SSV/USV valve design.

d. To demonstrate the verification testing covered by this specification that is required to qualify specific valve bore sealing mechanism manufactured under API Spec 6A for PR2 sandy service safety valves.

PERFORMANCE REQUIREMENTS

Included are minimum acceptable standards for verification testing of SSVs/USVs for two performance requirement levels. To qualify, a SSV/USV valve must pass the verification test specified in Section 4. The two performance requirement levels are:

a. PRI Standard Service

This performance requirement level of SSV/USV is intended for use on oil or gas wells that do not exhibit the detrimental effects of sand erosion or fouling.

b. PR2 Sandy Service

This performance level of SSV/USV is intended for use on oil or gas wells where a substance such as sand could be expected to cause a SSV/USV valve failure. This valve must also meet the requirements of performance level PRI Standard Service.

VERIFICATION TESTING