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pipe sizing for seismic gas valve

Posted by thelonghike (My Page) on
Sun, Dec 12, 10 at 12:05

I'm stumped on the sizing I need for a seismic gas shutoff valve for my home. The pipe from the utility is 3/4 inch before and after the gas meter. It then immediately branches off to two 1" pipes that serve a hot water heater, gas dryer, furnace and pool heater. I'm thinking if the pipe coming out of the meter is 3/4" a similarly sized valve should be fine. But a supplier wants to sell me a 1.5" valve, which would be a LOT of trouble to install. Can a gas plumber give me some advice? Thanks.


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RE: pipe sizing for seismic gas valve

The longer the section of reduced diameter the greater effect on flow.

A 1 inch valve should be more than adequate if it is 'full bore."

For valves that are NOT full bore, going up one size is not uncommon.


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