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Does increasing water pipe size increase water pressure?
Friday, April 10, 2020
The water pressure serving a house is the same at all sizes of pipe because it is a static measurement, meaning that it is determined with no water flowing. But, as soon as a faucet is opened, the pressure will drop and smaller pipes have a larger pressure drop, with the consequent slow-down of flow. Larger pipes offer less resistance to water flow, so there will be less pressure drop and more flow.
Longer pipe runs also decrease pressure/flow, so a combination of both small pipe diameter and long pipe run can cause a dramatic pressure drop. One example would be when multiple faucets in the same bathroom at the far end of a house that are opened at the same time. The friction from corrosion on the interior surface of old galvanized steel pipe will also reduce pressure/flow. To learn more, go to our blog posts What causes low water pressure in a house? and Does a home inspector check water pressure?
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