Help with twin undersink filter ID please
I have an 11 year old system comprising two connected housings for cartridge size 10" x 2.5" diam.
The housings are "off white" in color & I'd guess they are moulded in a glass reinforced material maybe nylon?
Each housing has 6 vertical ribs & seals to the top with two full turns compressing a sealing "O" ring.
The housings bear only these markings:
"Made in USA"
"USF - PPI"
One of the housings has failed, presumably due to pressure.
This is unexpected since the installation is protected with an in line PRV, limiting pressure to 130 PSI.
I'd like to determine the manufacturer so that I can get a recommendation about the optimum pressure at which the system should be run.
I suspect the manufacturer was "US Filters" but I can see nothing on any website that looks identical.
Greatly appreciate any help with ID or any other comment.
PRV settings - Rew ID housings
Sorry - I became foolishly confused in making conversions to psi (Australia went metric in 1972 so pressure here is expressed in KPa).
I agree with your general statement about domestic water pressure as found normally in the field.
My PRV (assuming it has not failed) delivers a max of 80 psi (600 KPa), & since I use the needle isolating valve to limit my flow, it's clear the PRV pressure could be lower, but it is non-adjustable.
The local water supply authority say the max supply pressure should not exceed 130 psi. I have heard that sort of vague claim before from supply authorities who often have very poor records of such things.
If indeed I have a Pentek or equivalent with a "max rating" of 125/100 psi (which seems meaningless to me, surely what we all want to know is what is the max recommended working pressure), then I'd agree you would want to limit your pressure to 50/60 psi.
So the indications are in view of the failure that the PRV is inappropriate for this application.
BTW I have again visited Pentek's website & used the link you sent but I can find nothing identical.
Could the markings refer to "US Filters" & if so who are they?
Finally your point about water hammer is well understood although I have no practical experience of measuring peak pressure from this phenomenon. However I'd guess you could expect at least a 50% over pressure spike, when you can hear the pipes banging.
So my problem source could be two-fold.
Many thanks again for your detailed & considered response.