Online inspection of safety valves is applicable to those safety valves; how is it carried out?
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This post was last edited by A Dai A Mu on 2012-1-9 at 22:38. Safety valves need to be inspected once a year in accordance with regulatory requirements. Sometimes, lever-type safety valves and some safety valves with springs that cannot be removed cannot be taken apart for inspection; I saw online that online inspection is possible, but I’m not sure about its scope of application and the procedures involved； May I ask: Can online inspection be performed on lever-type, non-removable spring-loaded safety valves? Which safety valves are used for online testing? How to perform online inspection?
At present, domestic safety valve manufacturers have not developed corresponding online monitoring devices; typically, two safety valves are installed in key positions during design, along with a three-way selector valve, which allows for online switching between valves A and B. Some foreign manufacturers can provide such online monitoring equipment, but it is not clear whether it is suitable for domestic safety valves
1. Currently, the online pressure setting devices for safety valves available in China seem to be usable only for mechanical spring-type safety valves, and not for lever-type safety valves. 2. Regarding the operating procedures for maintaining a constant pressure with safety valves online, it is recommended to follow the manufacturer’s technical documents and operation manuals provided by the equipment manufacturers specializing in such systems; no relevant standards or regulations have been found to date. 3. Most lever-type safety valves are used in the steam drums of steam boilers; therefore, in accordance with Article 146 of the Regulations on Safety Supervision of Steam Boilers, they should be calibrated at least once a year. 4. Lever-type safety valves are not suitable for calibration in a laboratory; generally, adjustments are made at high temperature after the valve has been set at a constant pressure at low temperature. For specific details, refer to the relevant provisions of TSG ZF001-2006 \"Regulations on Safety Technical Inspection of Safety Valves\". 5. In accordance with item (vii) of Section 4, \"Inspection Cycle and Inspection Items for Safety Valves\", Annex III of TSG R7001-2004 \"Rules for Periodic Inspection of Pressure Vessels\": \"Safety valves installed on pressure vessels containing toxic, harmful, flammable, or explosive media shall not be subjected to on-line inspection.\" ” I hope this will be useful to you for reference!
It’s not available in China yet! If it has been used for jumping, it must be sent to a calibration facility for re-calibration. Last edited by chinazwr on 2009-2-25 at 17:31.]