Criteria for putting safety valves into operation
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For those medium-pressure safety valves, one is in use while another serves as a backup; all of them are in operation. Are there any requirements regarding applying lead seals? I welcome experts to share their insights and guidance
One in use and one as backup is mainly because some devices cannot be shut down, so a backup is necessary. They were all put into use mainly because one unit could not meet the displacement requirements, so two or three units were installed. The seal is applied by the manufacturer at the time of production to prevent the parts from being tampered with.
One in use and one as backup is mainly because some devices cannot be shut down, so a backup is necessary. They were all put into use mainly because one unit could not meet the displacement requirements, so two or three units were installed. The seal is applied by the manufacturer at the time of production to prevent the parts from being tampered with ； Agree with this view
All manual valves for import and export must be sealed with lead seals!
I’ve never worked with a setup where one valve is in use and another is in standby mode. LNG storage tanks are equipped with two safety valves, both of which are normally in operation; however, each safety valve can meet the discharge requirements on its own, with switching occurring only during inspections. Seals are mainly of two types: one is installed on the safety valve itself to indicate that it has been calibrated, and if such a seal is damaged, it is advisable to calibrate it again. Another method is to use manual valves before and after the safety valve; once the safety valve is in operation, a lead seal is installed to prevent operators from adjusting it, thereby ensuring that the safety valve remains in its operational state.