The rated discharge pressure of the screw air compressor is 0.8 Mpa, while the design pressure of the air storage tank at the compressor’s outlet is 0.84 Mpa. So what should be the setting pressure for the safety valve on top of the air storage tank?
Thread Content
The rated discharge pressure of the screw air compressor is 0.8 Mpa, and the design pressure of the air storage tank at the compressor’s outlet is 0.84 Mpa. So what should be the setting pressure for the safety valve on top of the air storage tank? It turns out that the safety valve originally included with the equipment at the time of manufacture was set at 0.84 MPa; then why was it changed to 0.95 MPa when our equipment manager took it to the inspection agency for verification? Since the rated exhaust pressure of the air compressor is only 0.8, is a safety valve still necessary? The pressure of the gas emitted will never exceed the design pressure of the gas tank, which is 0.84, right?
At present, the safety valves of pressure vessels are often set at the working pressure of those vessels; the function of a safety valve is to prevent the vessel from exceeding its pressure limits. If your equipment manager has changed the pressure setting, it should be calculated as 1.1 or 1.15 times the original value – I haven’t seen the specific figures. Think about it carefully.
The rated exhaust pressure is 0.8 MPa. Generally, the setting pressure for a safety valve is taken as 1.05–1.1 times the maximum operating pressure; therefore, 0.84 MPa is acceptable. Later, 0.95 MPa was chosen – was this value determined by considering the maximum allowable operating pressure of the tank? In that case, it is usually higher than the tank’s design pressure
If you are certain that the \"design pressure\" of the gas storage tank is 0.84, then the maximum setting for the safety valve can only be 0.84; there is no other value possible.
The exhaust pressure is 0.8, but it exceeds 0.8 when pressure is built up; therefore, the pressure setting of the safety valve is generally higher than the operating pressure. Nowadays, in many cases, the safety valve pressure is set at the maximum operating pressure of the container or its design pressure