Will using a DN50 drain valve for a heat exchanger’s drain pipe with a diameter of DN100 affect the drainage of the pipeline?
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The inlet pressure is 1.55–1.65 Mpa, while the pressure in the flash tank is 0.85 Mpa. There are four pipelines: one with a diameter of DN50 (using a DN50 steam trap), two pipelines with a diameter of DN65 (one of these uses a steam trap with a reduced diameter of DN50, while the other one is not in use), and one pipeline with a diameter of DN32 (for bypass purposes). After replacing the two DN50 steam traps and activating the bypass, the heat exchanger failed to reach the required operating temperature of 165–174 degrees. Under these pressure conditions, the designed steam discharge rate for those two steam traps is 10.8 t/h, but the actual steam discharge rate was only 7.6–7.8 t/h; as a result, the temperature of the heat exchanger remained around 162 degrees. Does the design of the pipeline and its diameter changes affect the water drainage volume? The diameter of the main pipeline connecting to the rear secondary flash tank of the steam trap is DN100.
The steam trap models are spiral molecular sieve type DN50, two units; lever float type DN65, one unit
Is there backpressure after the steam trap? Has this aspect related to domestic regulations been considered for the steam trap?
There is a back pressure of 0.85 Mpa at the rear end of the steam trap, which has been taken into account when selecting the steam trap
If the actual temperature of the heat exchanger does not reach the desired level, it might be due to an issue with the heat exchange area; the process calculations were not done properly earlier. It could also be that the steam trap fails to discharge the steam condensate in a timely manner, which affects the heat exchange efficiency. If a bypass is used to allow direct drainage of the condensate, although some steam is wasted, if the temperature still does not rise, then it’s likely that the former issue is the more significant one
It mainly depends on the handling capacity of the steam trap and the back pressure behind the valve.
It mainly depends on the handling capacity of the steam trap and the back pressure behind the valve.
I think what was said on the fifth floor makes sense. :D
What was said on the fifth floor makes sense; it’s also possible that there is scale on the heat exchanger