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Thread: Leak Detection in Vacuum Conveying Systems

  1. #1
    jack_archer Guest

    Ideas on Leak Detection in Vacuum Conveying Systems

    Leakage of air into vacuum conveying systems can result in loss of conveying capacity. This is especially a problem in older systems. The leakage can occur from flanges/couplings, air lock and at filter receiver.

    Does anyone have practical experience or ideas for detecting location and magnitude of leaks in vacuum conveying systems ?

    Unlike postive pressure systems, where the leaks can be detected by soap bubble method or simply listening to the hissing sound of leaking air, vacuum systems have inward leakage.

    Thanks in advance.

  2. #2
    I have used the vacuum blower performance curve and my calculations to determine the extent of inward leakage. This is done by calculating the pressure drop in the conveying line without feeding any solids. First, assume that there is no leakage, calculate the pressure drop, and find the air flow from the performance curve. Then get the actual pressure drop reading and find the air flow from the performance curve. If this air flow is greater than the first, it means that there is leakage into the conveying line. Rotary valve leakage is always there and it can be calculated. Other leakages can be from pipe line joints, worn pipe lines, diverter valves, etc. If the calculations show that there is leakage, what I do is check the entire pipe line for tight joints, pin holes in the pipe line,and seals of the diverter valves.

    Please call me if you have any questions.

    Tim Agarwal
    Pneumatic Conveying Consultants
    www.powderandbulk/pcc.com
    polypcc@aol.com

  3. #3

    vac leak det

    we have found leaks pretty close by insearting a cfc gas detctor in the suction supply and then using any cfc in a can snoop the pipe and see where the alarm is. it works pretty quick
    Regards,
    Ray Sawyer
    (http://www.rs-controls.com)

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