Orifice Meter for Natural Gas Measurement.

[berbie78]

Masters,

I am working on Gas Metering Skid where I need to size the orifice meter. Could you please guide how the basis needs to be?

I have been provided with the following flowrate and other natural gas parameters like density, Molecular wt, viscosity etc,

Flowrate: Min - 85 kg/h, Normal - 3125 kg/h, Max - 3608 kg/h
Mol.wt

Temp: Min - 10°C, Nor- 25°C , Max - 45°C.

Do I need to size the orifice plate based on the above flowrate and temperature ranges?

Also, is there any special requirement on the pipe length on the upstream of orifice plate.

Thanks in advance.

 

[maddocks]

Get yourself a copy of the GPSA Data Book - it has a complete orifice sizing and flow chapter that explains all the factors.

 

[zdas04]

It is good to have the GPSA Data Book, but you need to be looking at the API 14.3 manuals (also released as AGA 3 and ANSI 2530). Any other information on measurement will reference this so why not start with it?

The requirements on upstream and downstream piping run to several dozen pages.

David

 

[maddocks]

Good call David - that's a better idea than using the GPSA Data Book....