May I ask where safety valves must be installed?
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This post was last edited by sibling on 2020-5-6 16:03. What areas require the installation of safety valves? Which standard specification sets out the relevant requirements? We have an outlet cooler for our screw air compressor (with an inlet temperature of around 100 degrees). The design institute requires a safety valve to be installed on the return pipe of the cooling water; we think it’s unnecessary, but we can’t find any evidence to refute this requirement.
You are the owner; you should demand that he follow the standards.
Whether to install a safety valve depends on whether overpressure will occur; there are no strict requirements regarding its location. Please analyze the situation under overpressure conditions – if none is needed, then no safety valve should be installed
It’s generally necessary; when the equipment isn’t equipped with it, it’s provided in the piping system.
I’ll just state one fact: safety valves are installed on the circulation water pipelines of imported units. They aren’t very large, and regardless of the size of the unit, the diameter is always DN25. There seems to be some rule regarding this, but I can’t find it now
Leaks in the outlet cooler can cause overpressure; a safety valve must be installed on the return water
Have seen such necessary safety measures
For towers, the value is greater than 30 kPa; for containers, safety valves are designed for pressures above 100 kPa
It’s not a rupture of the heat exchange tubes; for such a rupture to occur, the design pressure on the low-pressure side must be less than 2/3 of the design pressure on the high-pressure side. A safety valve is installed at the outlet of the cold-side fluid in the heat exchanger to account for thermal expansion that occurs when the valves at the inlet and outlet of the cooling fluid fail to close; foreigners take this scenario into consideration. According to clause 7.0.1 of HG20570.2-95, valve shut condition.
According to system specification 20559, a safety valve should be installed on the cooling water main for air compressors whose exhaust volume is 20 Nm3/min or greater