What is API 598? API 598 is a standard published by the American Petroleum Institute that covers valve inspection and testing requirements.

Which types of valves does API 598 apply to? API 598 applies to all types of metal valves, including gate, globe, check, ball, and butterfly valves.

What are the main objectives of API 598 testing? The main objectives are to ensure that valves meet specified performance requirements, including seat and seal tightness, and that they are capable of safe and reliable operation.

What are the key clauses covered in API 598? API 598 covers clauses related to pressure testing procedures, acceptance criteria, test fluids, test duration, leakage rates, and inspection criteria.

What is the pressure testing requirement according to API 598? Valves must be subjected to hydrostatic or pneumatic pressure tests to verify their structural integrity and sealing capabilities.

What are the acceptance criteria for seat leakage in API 598? API 598 specifies permissible seat leakage rates based on valve size and class, typically measured in drops per minute or another specified unit.

How does API 598 define test fluid requirements? The standard specifies the type of test fluid (liquid or gas) to be used based on valve design and materials compatibility.

What is the duration of the test according to API 598? API 598 specifies the minimum duration for which the test pressure must be maintained to evaluate the valve’s performance under pressure.

Who performs the testing as per API 598? Testing is typically performed by qualified personnel, often including third-party inspectors or certified testing laboratories.

Is API 598 mandatory for all valves in the process piping industry? API 598 is widely adopted as a standard practice for valve testing, but its application may vary based on contractual requirements and industry standards.