What does API 598 mean?
API 598 specifies pressure testing methods and acceptance criteria for various industrial valves, serving as a crucial basis for valve quality control in industries such as petroleum and chemical engineering. The standard primarily applies to common valve types such as gate valves, globe valves, plug valves, ball valves, check valves, and butterfly valves, but may also be applied to other special valves after consultation between the user and the manufacturer.
API 598, the standard for valve pressure testing, is an important guidance document for pressure testing valves, primarily used to verify their sealing performance and pressure resistance. According to this standard, valve pressure testing should adhere to the following regulations:
1. Test Temperature: For cryogenic valves, the test should be conducted at -29°C (-20°F) to ensure the valve's performance in low-temperature environments.
2. Test Medium: Water or nitrogen can be used as the test medium for valve pressure testing. The appropriate medium should be selected based on the actual situation and valve type.
3. Test Time: The test time should be no less than 15 seconds to ensure sufficient testing of the valve's sealing performance.
4. Acceptance Criteria: During the pressure test, the valve must not leak or experience significant pressure reduction. After the test, the valve should be checked for any abnormal noise or leakage, and the test results should be recorded. Only valves that meet these standards can be considered qualified products.
Differences between API 598 and API 608
While both API 598 and API 608 are important standards in the valve industry, they differ significantly in several aspects:
1. Application Areas: API 598 is primarily used for system valves in building and heating/ventilation systems, while API 608 focuses on the design and development of industrial process valves, particularly for pipeline opening and closing in the chemical industry.
2. Structural Details: API 608 specifies detailed structural design requirements for low-pressure, large-diameter steel gate valves, globe valves, and check valves, including strength, stiffness, and channel shape, and specifies heat treatment hardness values for sliding bearing components. In contrast, API 598 has broader requirements in these details.
3. Product Certification: Because they belong to different standard systems, valve products conforming to API 598 or API 608 require corresponding certifications, such as IRIS, ASME, or API. This means that companies need to select the appropriate standard and apply for the corresponding certification based on the needs of their target customer groups during production and sales.
API 598 valve in stock
