I am new to the pressure relief valve world and having an issue on a relief valve that has already been installed. The valve is a conventional relief valve for pipe thermal relief of vapor and the outlet is piped to a vent. The capacity of installed valve is about 4 times of the flow rate needed. The valve inlet/outlet sizes are 1/2" and 3/4". However, the discharge line is reduced to 3/8" due to limited space. I am concerned about if the valve will still function properly. I understand the valve capacity will be reduced due to the smaller discharge line and the backpressure probably way beyond 10% of the set pressure. Since the valve is oversized, is it possible to use the backpressure correction factor to calculate the reduction on the capacity? Are there other concerns, chattering?
Any education and advice are greatly appreciated.
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