|Description / Abstract
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|This standard covers inspection, examination, supplementary
examinations, and pressure test requirements for resilient-seated,
nonmetallic-seated (e.g. ceramic), and metal-to-metal-seated valves
of the gate, globe, plug, ball, check, and butterfly types.
Resilient seats are considered to be:
a) soft seats, both solid and semi-solid grease type (e.g.
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.
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.
The following tests and examinations are specified in this
a) shell test,
b) backseat test,
c) low-pressure closure test,
d) high-pressure closure test,
e) double block and bleed high-pressure closure test,
f) visual examination of castings by the manufacturer,
g) high-pressure pneumatic shell test.
|Additional Supplemental Documents