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Orifice meter runs

Orifice meter runs

Orifice meter runs

Does anyone know of any issues regarding using an orifice on a 1" pipe run for gas measurement? They want to weld on some 1" flanges on the 1" pipe and place an orifice between.

Please let me know your thoughts.


RE: Orifice meter runs

Flanges usually aren't a problem since they have a line-size opening (or larger). Just make sure you have the proper runs of straight pipe both upstream and downstream as specified by the orifice plate manufacturer.

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RE: Orifice meter runs

There are commercial orifice flange unions, predrilled and tapped for the standard 1 inch upstream/downstream taps for impulse tubing.

Usually come with a jackscrew, too.

RE: Orifice meter runs

API 14.3 (AGA 3) says that their calculations and standard dimensions cannot be used below 2-inch. Daniels and others sell a 1/2-inch and 1-inch unit, but they don't claim that these units satisfy API 14.3 (you have to read their material really closely to catch that). Bottom line is that for custody transfer a 1-inch meter will violate the contract that says "build in accordance with API 14.3/AGA 3". For engineering data it is probably fine as long as the accountants don't get involved and start using the numbers for something regarding a regulation or a contract.

David Simpson, PE
MuleShoe Engineering

In questions of science, the authority of a thousand is not worth the humble reasoning of a single individual. Galileo Galilei, Italian Physicist

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