Isolation valve on the branch pipe
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This post was last edited by Clouds of flowing water shine on 2019-10-22 at 10:12. For steam main pipes, they should be installed horizontally; cut-off valves on branch pipes need to be placed in the horizontal sections. Normally, there is no problem, but in a project where the supervisor is located on the lowest floor of the utility tunnel and has to climb up to the highest floor, with a height difference of over 7 meters, is it still possible to set it up this way? The recommended approach is shown on the right side of the diagram; the owner suggests adopting the approach on the left side and installing a steam trap behind the valve. So, which option should be chosen?
This post was last edited by At the foot of the hill on 2019-10-22 at 12:38. For manual valves in steam pipelines, horizontal installation should always be preferred to avoid water hammer caused by water accumulation. It is also possible to use a branch pipe beneath the main steam pipe, and install an inverted drum steam trap at the lowest point of that branch pipe.
If the pipeline in the latter section is in constant flow, there is no issue of liquid accumulation. Moreover, many of our systems use the valves arranged on the left side to facilitate operation
What I showed in the diagram is one end of the pipe corridor; the other end indeed looks like what you described. There is no space in the upper, left, and right directions. We can only go from below; thanks for your diagram.
The owner did not inform whether there will be long-term movement. Even in the case of long-term operation, there is a need to initiate hydrophobicity; not far from the site, the steam pipes are connected as shown in the left diagram.
It’s advisable to follow the recommended approach; it’s better to listen to the homeowner, as long as it doesn’t affect the functionality of the product.
Valves that are temporarily installed during setup are usually used on utility tunnels, and they remain open for long-term use afterward. So, it’s also no problem to install the valve vertically directly. Even if it’s not used for a long time, there’s no fundamental difference between the left and right sides. There might be fluid accumulation on the left side; all that’s needed is to open the valve before connecting the tube to drain out the fluid. It does not affect usage.
The valve is installed vertically and directly; is it necessary to install a drain behind the valve?
The original poster, please take a look at what is said later: “Valves should be installed on horizontal pipe sections.” It doesn’t state that they must necessarily be installed on horizontal sections; in many cases, it’s necessary to consider the actual conditions on site