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Thread: Pressure gain, loss or stays the same?

  1. #1
    Associate Engineer
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    Jan 2016
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    Pressure gain, loss or stays the same?

    If I have two radial compressors (blowers) in parallel joined by a "Y", each with a capacity to produce 300 cfm, the output at the "Y" connector is the sum of the two, that is. we have 600 cfm? The pressure I know it's the same, but I have been told the flow is added, is this correct? It was thought instead of having a large compressor, he can replace 1 large with two of these smaller, each can flow 300 cfm, put a connection in "Y" will have the resulting flow the sum of them?
    I was tough this configuration would result in same additional CFM or the sum of both compressor's CFM and the PSI the same.

  2. #2
    Technical Fellow Kelly_Bramble's Avatar
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    Feb 2011
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    Bold Springs, GA
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    The flow potential is 600 cfm... Depending on the Y and piping sizes the actual flow potential will be less due to friction and pressure drop..

    See:

    Fluids Engineering and Design Data

    Pressure Drop Along Pipe Equations

    Pressure Drop Due to Pipe Size

    Pressure Drop Due to Pipe Size 2

    Pipe Friction and Pressure Drop
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