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Govind Rao
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Calculating the I D of Ducting

04/27/2011 5:34 AM

Please tell me as to how to calculate the size of the ducting to convey 27000 cubic metre per hour of producer gas at a pressure of 1000 mm WC
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pritam
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Re: Calculating the I D of Ducting

04/28/2011 6:25 AM

It may be piping instead of ducting for producer gas. Check the prescribed velocity from relevant standard, I think its around 10 m/s or 36000 m/hour. Divide volume flow rate by velocity to get cross sectional area of pipe. From this calculate pipe diameter required and select next higher standard size pipe. For your case with 10 m/s velocity, DN1000 pipe is just sufficient.
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Govind Rao
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#2
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Re: Calculating the I D of Ducting

04/28/2011 7:42 AM

Thank you for the information Mr. Pritam. Can you cite the title of relevant standard and the source for further use?
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pritam
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#3
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Re: Calculating the I D of Ducting

05/13/2011 4:51 AM

You can refer ASME B31.2-1968 (fuel gas piping). Also IPSS:01-06-014-02 for code of practice.
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Govind Rao
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#4
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Re: Calculating the I D of Ducting

05/15/2011 11:39 PM

I did refer to the ASME standard, I believe they for home appliances and not for industrial application. Could you give some thumb rules? like the one you said "10 m/s for the velocity" and the size of the pipe as DN 1000.
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pritam
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#5
In reply to #4

Re: Calculating the I D of Ducting

05/16/2011 5:07 AM

I didn't go through ASME standard. IPSS does not give velocity. But I have seen some tender specification where piping velocity of fuel gases are specified up to 20 m/s. However 15 m/s can be safely followed. For 15 m/s pipe size may reduce to DN 800.
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