API598 8th Ed 2009 Valve Inspection and Testing

This standard covers inspeciton, examinaiton, and pressure test requirements for resilient-seated

1.1 Description: nonmetallic-seated (e.g.ceramic), and metal-to-metal-seated valves of the gate, globe, plug, check and butterfly teyps. Resilient seats are considered to be:

a) soft seats, both solid and semi-solid grease type (e.g.lubricated plug);

b)combination soft and metal seats;

c)any other type valve designed to meet resilient seat leakage rates as specified in Table 6.

API 598 supplements the API standards that reference it, but it may also be applied to other types of valves by agreement between the purchaser and the valve manufacturer.

1.2 The inspection requirements pertain to examinations and testing by the valve manufacturer and any supplementary examinations that the purchaser may require at the valve manufacturer's plant. The test requirements cover both required and optional pressure tests at the valve manufacturer's plant, or at a facility mutually agreeable to both the manufacturer and purchaser.

1.3 The following tests and examinations are specified in this standard:

a) shell test

b) backseat test

c) low-pressure closure test