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Rules of thumbs said that every 50D pipe length results approximately 3 dB Sound Power Level (PWL) attenuation where D is in meter (m). This is presented in "Measures & Technique In Eliminating / Minimizing PWL". This post will base on this simple rule-of-thumbs to generate a simple equation for Sound Power Level attenuation due to pipe length.
Derivation
For every pipe length of 50D, the PWL loss will be 3 dB,
PWL loss per meter of pipe length = 3 / 50D = 0.06/D
Sound Power Level attenuation for any pipe length of L,
where
PWLLoss,L = PWL loss per meter pipe length (dB/m)
L = Pipe length (m)
D = Pipe internal diameter (m)
Following is typical graph for Unit PWL versus pipe ID.
Related Topic
Derivation
For every pipe length of 50D, the PWL loss will be 3 dB,
PWL loss per meter of pipe length = 3 / 50D = 0.06/D
Sound Power Level attenuation for any pipe length of L,
PWLLoss,L = 0.06 L/D
where
PWLLoss,L = PWL loss per meter pipe length (dB/m)
L = Pipe length (m)
D = Pipe internal diameter (m)
Following is typical graph for Unit PWL versus pipe ID.
Related Topic
- PWL Reduction By Splitting Flow
- Calculate Combined Sound Power Level (PWL)
- Measures & Technique In Eliminating / Minimizing PWL
- Principle in Eliminating & Minimizing AIV Impact
- Energy Input or E-method In Assessing AIV
- Assess AIV with "D/t-method" with Polynomial PWL Limit Line
- Assess AIV with "D/t-method" with Logarithm PWL Limit Line
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