Please tell me about the problem of waterproofing of steam pipes!
Thread Content
As shown in the figure, the steam pipeline entering the boundary area from the main gallery is designed like this. Steam was introduced to the boundary area, and the main pipe was first supplied with steam. When valve 1 was opened, water hammer occurred. I would like to ask if this design is correct? 1Should drain be added before the valve? Or when the main pipe supplies steam, valve 1 should be open and valve 3 should be opened for drainage?
Why is it designed like this? If valve 1 is closed, water hammer will definitely occur. The condensate between pour u and valve 1 cannot be drained
There is nothing wrong with the design. In this theory, there should be no water hammer. If it is a positive u, it will be possible.
I think this design will prevent water hammer from occurring. During operation, you only need to open valve 3 to drain all the water, then open valve 1 less until steam is seen in valve 3, and then open valve 2 to guide the steam backward. However, when opening valve 2 to guide steam backward, the back path still needs to open condensation and drainage, otherwise the pipeline is cold and the steam will condense into water, causing water hammer in the back path. Wait until all the condensation points are filled with steam, then open valves 1 and 2, and then the steam guidance is completed.
Personally, I think the outlet on the pipe gallery should be equipped with valves and water diversion. In the situation you mentioned, there should be fluid accumulation in the outlet pipe. Turn on the drain to drain the condensate and there will be no water shock. Open it slowly. In this case, the pipe must also be warmed. There is no big problem with this design. I don’t know how long your U-shaped bend is.
The drain should be set before valve 1. If the main pipe is ventilated, the air in front of valve 1 will be dead, and condensed water will exist over time. If valve 2 is closed and valve 1 is opened first, water hammer will inevitably occur. If valve 2 is opened first and then valve 1, it may be better. It depends on whether the drainage settings of the pipes in front of you are reasonable. Valve 3 has basically no effect, because water hammer has already occurred on valve 2 before it takes effect. Overall, this designer definitely has little experience.
There is no problem with the pipeline design. The key is to open the shower downstream of valve 1 first when introducing steam, and then open valve 1 slightly to warm the pipe, so that the operation can be done slowly.
Many times, even if the design and piping are fine, improper operation can cause cold shock!
Set a trap at the end of the user's steam pipeline.
You should first fully open valve 3, then slightly open valve 1. After valve 3 has a large amount of steam, close 3, slowly open 2, and then open 1. What if I installed a warm line before valve 1 and after valve 2 during the design?