Leakage rate between two pipes & gasses

In summary, The individual is facing difficulties in modeling methane leakage in a marine methane piping system. They have read a Physics Forum thread discussing a similar issue, but the starting conditions and model are different. The piping system has an inner and outer pipe, with methane flowing in the inner pipe and air flowing in the outer pipe. The pressure and flow are known and constant. The individual needs to estimate the methane leakage from a hole in the inner pipe and is wondering if it can be solved using a Bernoulli model or if a CFD is necessary. The 3d model linked in the forum discussion does not fully apply to their situation as it considers a pressure decrease in the vessel, while their system has constant pressure. The problem can be
  • #1
Giuliano69
2
0
Hi, I'm facing the problem to model a methane leakage in a methane piping.
I read the 3d on a vessel leakage
https://www.physicsforums.com/showthread.php?t=92511
but the starting condition and model seems different

A marine methane piping, usually present an inner and outer pipe.
In the inner pipe, methane flows at known pressure and flow. The pressure is assumed constant (kept constant by the ship automation)

In the outer pipe, air flows, at known pressure and flow (contercurrent and underpressure)

I need to estimate the methane leakage that a hole in the inner pipe can produce.

Can be solved with a Bernoulli model, or it needs a CFD ?


Does the 3d linked above apply to our model ?
It seems that in the present situation pressure is constant, instead the model linked consider a pressure decrease in the vessel...
 
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  • #2
the problem could be represented as two gas moving in opposite direction, with constant pressure and flow,
separated by a diaphragm with an hole

p1, v1, f1 --->
--------------------- -------------------
<--- p2, v2, f2


could a simple Bernoulli theorem give an estimation of the leakage ?
 

1. What is the leakage rate between two pipes and gases?

The leakage rate between two pipes and gases refers to the amount of gas that escapes from the space between two connected pipes, usually due to small holes or gaps in the pipes.

2. How is the leakage rate between two pipes and gases measured?

The leakage rate is typically measured in units of volume per time, such as cubic feet per minute (CFM) or liters per second (L/s). This measurement can be obtained by using specialized equipment such as a flow meter or by calculating the difference in pressure between the two pipes.

3. What factors can affect the leakage rate between two pipes and gases?

The leakage rate can be influenced by a variety of factors, including the type and pressure of the gases involved, the condition of the pipes, the temperature and humidity of the surrounding environment, and the type of connection between the pipes.

4. How can the leakage rate between two pipes and gases be reduced?

To reduce the leakage rate, it is important to ensure that the pipes are properly sealed and that any holes or gaps are repaired. This can be achieved by using appropriate sealing materials and regularly inspecting and maintaining the pipes. In some cases, it may also be necessary to adjust the pressure of the gases or to use specialized connectors to improve the seal between the pipes.

5. Why is it important to monitor the leakage rate between two pipes and gases?

Monitoring the leakage rate is important for several reasons. It can help to identify and address potential safety hazards, prevent the loss of valuable gases, and improve the overall efficiency of the system. It can also provide valuable data for maintenance and troubleshooting purposes, allowing for early detection of potential issues before they become more serious problems.

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