[RE-wrenches] SDHW and High Mains Pressure

[Peter Parrish]

We are getting ready to install a SDHW system for a customer and we looked
at a number of things regarding his current set up. I just posted a question
about tankless heaters but I wanted this query to be a separate one. The
customer's mains water pressure is 88 psi on a Saturday afternoon and some
time over the next 18 hours, the pressure went as high as 96 psi. I
understand that 80 psi is the high end of the safe range in general and that
96 psi on a regular basis can/will damage valves and possibly trigger T&P
valves on water heaters.

 

At the recommendation of a plumber I know I looked into pressure reducers,
specifically the Wilkins/Zurn line. All the Wilkins regulators produce zero
pressure drop at zero flow. What good are these products in protecting
plumbing systems from high mains pressures at night when pressures tend to
be the highest and usage is at a minimum or even zero?

 

Are there products that will prevent system pressures from exceeding a set
point (e.g. 60 psi) under any flow condition including zero?   

 

- Peter

Peter T. Parrish, President
California Solar Engineering, Inc.
820 Cynthia Ave., Los Angeles, CA 90065
Ph 323-258-8883, Mobile 323-839-6108, Fax 323-258-8885
CA Lic. 854779, NABCEP Cert. 031806-26
peter.parrish at calsolareng.com 

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