Gas Pipie Sizing Calculation

**srinivasarao** · 07-28-2011, 10:13 AM

Hi Fr,

Please Help me about Gas Pipe Sizing Calculation Please.........

**Mr Welder** · 07-28-2011, 08:04 PM

Originally Posted by srinivasarao

Hi Fr,

Please Help me about Gas Pipe Sizing Calculation Please.........

Gas Pipe Sizing calculator (In PPD Software)

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**srinivasarao** · 07-29-2011, 06:47 AM

Hi,

Can you please Help me the Formula and Related Reference books for the same

**SnowTDM** · 08-02-2011, 09:36 AM

For speed of the gas:
V=378x(QxZ)/(PxD^2)
V = Speed in m/s.
Q = Flow in Nm3/h.
Z = Compressibility factor (you can use Z=1 if you don't know)
P = Absolute pressure in bar.
D = Internal diameter in mm.

For thickness you can use ANSI B31.1 for factories or power plants or 31.8 for underground gas pipes

**sharmeen** · 08-02-2011, 03:57 PM

Thank you

**SnowTDM** · 08-02-2011, 04:52 PM

Please, note I have corrected the formula, instead of 278 the good value is 378.

Sorry for any inconvenience.

**carboglass** · 08-07-2011, 07:30 PM

Thank you!

**ChrisSpencer** · 08-17-2011, 02:40 PM

There are formulas but most of the tables are drawn up from empirical data. The way the size is calculated has several flaws but they are not addressed in the real world. For example, I once asked an inspector, "If I have a big boiler near the gas meter and it calls for a 3" gas line, why, if I add a barbecue 100' away does the table suddenly tell me the boiler now needs a 4" supply line?"