Is a necking required in front of the steam trap?
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The steam pipeline has a diameter of DN80; a drain valve is installed on the outlet pipeline after heating the equipment. Calculations show that the drain valve should have a diameter of DN25. Should the pipeline before the drain valve still be DN80? If a DN25 pipe is used in front of the steam trap, will this cause both phases of the fluid to be forced to accumulate in front of the steam trap? What consequences will arise?
If a DN25 valve is selected, a DN25 transition pipe is usually used; the pipe is connected to the trap separately, so there is no issue with two-phase flow. Moreover, a qualified trap will effectively prevent air from entering while allowing water to drain
The steam trap does not have to be installed directly on the main pipeline; a DN25 pipe can be connected to the DN80 main pipeline, and the steam trap can then be installed on that DN25 pipe
The calculation shows that a DN25 steam trap is required; therefore, a DN25 pipe can be used before the steam trap. Once the steam turns into condensed water, it is quickly drained, so there will be no problems. Of course, if the displacement of the selected steam trap is insufficient or there are quality issues, leading to delayed drainage of condensate, it will affect the heating efficiency.
We usually use pipes of the same size; the diameter of the pipes doesn’t change: lol;P
Our steam has a diameter of DN50, while the check valve has a diameter of DN25; therefore a necking is required. There’s no problem with that. Since DN25 is specified for the valve, a necking is necessary – otherwise, how can it be connected?
There’s no need to change it, right? Just use what comes out of the heat exchanger directly, just like with a steam trap
DN80 is the main pipe; you connect a small-diameter pipe beneath it and then install a steam trap.
If a drain valve is installed at the equipment outlet, its diameter can be matched to that of the equipment outlet, using a DN80 flange
The pipeline selection before and after the steam trap is different. The pipeline before the steam trap should be selected based on liquid condensate, but care must be taken to keep the pressure drop as low as possible and to make the pipeline as short as possible. Since the exact steam pressure and flow rate were not provided, I am giving you some suggestions. The pipeline downstream of the steam trap should be selected based on secondary steam requirements, with a much larger pipe diameter. To ensure complete drainage, eccentric tees should be used before and after the steam trap.
The main supervisor is connected to a collection pipe of the same diameter as that of the supervisor, which is then connected to DN25