【Q&A Question 313】November 27, 2017
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【Q&A Question 313】November 27, 2017: What are the basic requirements for safety valves? 1. Sufficient displacement ； 2. Sufficient sensitivity ； 3. Close the valve promptly ； 4. Good sealing performance. (Unless otherwise specified, all questions and answers are based on hydrogenation units.) ) For management purposes, if you need to view content from a few days ago, please go through the summary post below. 2017 Q&A Summary Thread (updates have begun) http://bbs.hcbbs.com/thread-1657793-1-1.html 2017 Daily Question Summary Thread (updates have begun) http://bbs.hcbbs.com/thread-1657794-1-1.html 2016 Q&A Summary Thread (updates completed) http://bbs.hcbbs.com/thread-1597792-1-1.html (Source: Haichuan Chemical Industry Forum)
The operating temperature, pressure, medium, etc. meet the required specifications; it can release pressure when the starting pressure is reached, and it can return to its original position once the pressure drops below the starting level
Accurate activation, stable emission, timely re-seating, good sealing performance
A safety valve is an important accessory installed on special equipment (boilers, pressure vessels, pressure pipelines, etc.) that serves to limit and release pressure, thereby providing safety protection. Safety valves are generally installed directly on special equipment. Their design, manufacturing, installation, use, and inspection must all comply with the requirements set forth in the regulations regarding special equipment, as their reliability and performance have a direct impact on the safety of both the equipment and people, and they are also closely related to energy conservation and environmental protection.
Accurate activation, stable emission, timely reseating, and reliable sealing.
1) It has good sealing performance: it can remain airtight under normal operating pressure, and it is also required to close again after the discharge pressure drops, while still maintaining its seal； (2) The operation is sensitive and reliable; when the pressure reaches the opening pressure, the valve disc can quickly lift automatically to facilitate the smooth discharge of the medium ； (3) Under discharge pressure, the valve disc shall reach the fully open position, enabling the valve to achieve a safe discharge volume ； (4) It has a compact and rational structure, making it easy to adjust.
1. Sufficient displacement 2. Sufficient sensitivity 3. Timely valve closure 4. Good sealing performance.
1. Sufficient displacement 2. Sufficient sensitivity 3. Timely valve closure 4. Good sealing performance
Pressure Temperature Medium Leakage rate
1. Accurate activation. 2. Stable emissions. 3. Return to seat promptly. 4. Seal reliably.
①The pressure setting of the safety valve complies with the design specifications. ②The lead seals and nameplates are intact, with clear markings. ③For the safety valves on pressure vessels storing flammable and toxic media, pipes should be installed to lead them to a safe location for proper disposal. ④The isolation valve between the pressure vessel and the safety valve should be fully open. ⑤There are complete records for operation, maintenance, and testing.