Latest Discussions : Plumbing

DIYHomeSaver

04:16PM | 06/26/19
Member Since: 06/26/19
3 lifetime posts
Question:
What is the expansion tank's proper pressure to set at with this info?

Plumbling: 3/4-in pipes.

Incoming water pressure set from the primary pressure regulator: 70-psi.

Incoming water pressure set from the secondary pressure regulator about 100-in away from the water heater cold line connection: 60-psi (per recommended by water heater manufacturer)

Water pressure gauge reports ~80-psi on the cold line 80-in away from the water heater cold line connection. This means the entire hot water line system in the house equalizes at ~80-psi.

I'm still scratching my head to comprehend the functionality of the expansion tank effectiveness if the hot water lines equalized at ~80-psi while the expansion tank pressure is set at 60-psi.

Any help is greatly appreciated.

BV019625

02:29PM | 06/27/19
It should have a drop down pressure equal to 2% of the core value of the inlet pressure divided by 33.27895 @ 75 deg F


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