Process Area Activity – [I See Now-57]: Setting the Pressure Rating of Safety Valves
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This post was last edited by *nht1 on 2016-11-13 20:50. This issue occurred twice during operation; it was found that the flow rate of the reciprocating pump was not proper. At first, the cause could not be identified, but after careful investigation, a frequent operating sound from the pump’s outlet safety valve was heard. By checking the design documents, it was discovered that the set pressure of the pump’s outlet safety valve was too low. Setting the relief valve pressure too low is a common mistake made when first starting out in design. It is unnecessary to set the pressure too low; setting it equal to the device’s design pressure is sufficient, as a design margin has already been taken into account during the device’s design. When the set pressure is close to the operating pressure, fluctuations in the operating pressure can cause the safety valve to operate frequently, leading to leaks and waste of process materials.
This is often done during design to ensure safety
Just turn off the safety valve to avoid it tripping constantly. It doesn’t have much of an impact
The difference between the set pressure and the operating pressure of the safety valve should not be too small, otherwise frequent tripping will occur; generally, the design pressure of the equipment is used in the design phase. If the safety valve is installed on a pipeline, the design pressure of the protective device, plus the static pressure difference and resistance losses, together constitute the set pressure.