How to understand the safety valve installed in the reboiler heating pipe
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Using a liquid-heated reboiler, a safety valve (from the HG20559 appendix) is set upstream of the liquid return pipe shut-off valve. How do you understand it? Generally, a safety valve is installed downstream of the inlet valve. Why is there a safety valve upstream of the outlet valve?
This is the pipeline for heating the reboiler. After heating, the outlet temperature has dropped. How can it expand?
It may be that the valve is closed, causing pressure to be suppressed.
A bunch of valves in the inlet pipeline are not considered to hold pressure, but the outlet is considered to hold pressure.
It is indeed far-fetched. After the outlet is closed, will the sunlight cause the thermal test to heat up and vaporize?
The inlet and outlet liquid valves are closed and the heat exchange shell side is overpressured and thermally expanded.
To prevent the outlet valve from closing by mistake, the temperature in the heat exchanger will be too high, causing the shell pressure of the heat exchanger to rise and overpressure leakage.