Problem of uneven pressure in gas pipeline branches
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The situation is as shown in the figure below: the pressure in the main pipe is 140 KPa, the pressure before the valves in branches A and B is 120 KPa each, while the pressure in branch C is also 140 KPa. Excluding the possibility that the pressure gauges are faulty (as similar situations occur in multiple systems), the gas consumption in each branch is the same; logically, the pressure before the valves should be the same as the pressure in the main pipe. What could be causing this situation? Personally, I think at the junction of the main pipe and the branch pipes, the gas flow in the main pipe causes a pressure drop at the branch pipes (similar to a Venturi tube); however, since the gas velocity is low, the pressure drop is also small. I’m not sure if this is indeed the case! Those who are interested can discuss it!
This is probably caused by the unit using too much gas. For reference.
It is caused by the dynamic head loss in the branch piping; changing the tee to an angled connection should help improve the situation.
1. Turn off Route C and see if the pressure on Routes A and B can increase. 2. Adjust the opening of valve C to equalize the pressures in circuits A, B, and C.
If the pipe diameters are the same, it is caused by different gas consumption rates of the branch pipes. The simplest solution is to turn off one of them and see whether the pressure in the pipe with the lowest consumption rises
Consider the gas consumption and pressure in the pipeline downstream of the valve.
This situation is caused by differences in pipeline resistance and gas consumption. Increasing the pipe diameter or installing separate cylinders can reduce this phenomenon to a certain extent. .
The local resistance wasn’t calculated properly; the equivalent length of a standard elbow is 30D, while that of a tee branch is 60D. Do you think this will work all the time?
The total air supply volume does not match the total air supply volume of the branch lines; increasing the diameter of the main pipe and the air supply volume will resolve this issue
This occurs when the gas flow velocity inside the pipe is high; in such cases, the branch pipes are connected at an angle to the direction of the gas flow, or a gas distribution station is used.
When the gas velocity is high, a \"siphon\" effect is created at the first two branch pipe openings; it’s similar to how a high-speed train can pull a person towards it when that person is too close to the tracks. This effect counteracts part of the pressure