Questions regarding the final-stage heat exchanger of the booster?
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In the final stage heat exchanger of the booster, air flows through the tube side while water flows through the shell side. There is a gas-side drain and a water-side drain at each end of the head; the valve for the gas-side drain is of DN25PN100 size, which is understandable as the pressure on the gas side is high, hence this valve type is used. However, the valve for the water-side drain is also of the same type, even though the maximum water pressure is only 0.45 MPa. Why is that? The heat exchanger is produced by Hubei Dengfeng. Does anyone have these drawings? I would like to know the internal structure of the seal at the water-side drain area! Thank you all! Thank you!
To prevent high pressure from building up behind low pressure due to tube bundle leakage, the shell-side drain valve is configured in the same way as the tube-side one.
The influence of gas cross-flow due to tube bundle leakage should be taken into consideration, but the pressure rating of the inlet and outlet valves for the water circuit should be selected as normal.