Sudden Drop In Water Pressure - Plumbing - Contractor Talk

Sudden Drop In Water Pressure

 
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Old 07-08-2019, 05:48 AM   #1
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Sudden Drop In Water Pressure


16 unit apartment complex
1 bath 1 Kitchen 1 dishwasher each. replaced this water heater on this building and now the whole hot water system is lower and it seems like the cold is too.

The systems dropped by anywhere from 10-15-20 lbs.

Im currently at 70 lbs with all the irrigation going we've lost anywhere from 20 - 30 lbs of pressure.

It'll be pressurized pushing around 85-80 and then get a gradual drop by 10- 15 lbs after I starting using the shower hot water.

I cant see the hot water heater but im assuming its around 80-100 gal 18,000 btu gas water heater.

I've checked all the basics.

All valves are fully open, all aerators and mixing valves are clean.

Doesnt look like any piping has been downsized on inlet or outlets.


I'm not sure if they purged the system for air but assume they did & I did a kitchen sink purge myself but I dont think its effective because everybody else in the building would have to have everything closed and off for the sink purge to be effective.

According to water heater manufacturers the volume isnt restricted in water heaters so even if the water heater didnt have the capacity and btu to supply the building the volume of water wouldnt be restricted and not cause lower pressure just the water wouldnt get hot enough.

They added an inline pump but it did hardly anything at all.

I saw something that looked like a check valve that looked like it might be restricting the flow. it looked like a double sided bell fitting but it was one entire piece and i cant indentify the fitting so im assuming its a check valve even though it doesnt quite look like its tapered on each side and narrow in the middle.

I didnt see any expansion tank on this system though to test it.

Im assuming the prv is still good since its been only installed a month ago.

Any thoughts on the culprit and the resolution?

Im assuming it's that fitting I cant indentify cause it wasnt me who installed this.

Thanks
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Old 07-08-2019, 01:59 PM   #2
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Re: Sudden Drop In Water Pressure


I'm not a plumber, but you are assuming a lot of things.

Are you a plumber?

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Old 07-08-2019, 02:10 PM   #3
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Re: Sudden Drop In Water Pressure


Yes. Im plumber too. Im just looking for answers not attitudes. thanks for trying.
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Old 07-08-2019, 03:01 PM   #4
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Re: Sudden Drop In Water Pressure


Annnddd that's where you most likely lost everyone else that was gonna contribute.

Vinyl had a legitimate question, no matter how it came off to you . I hope you didn't put all your eggs in one basket asking on this forum only
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Old 07-08-2019, 03:04 PM   #5
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Re: Sudden Drop In Water Pressure


Do you call yourself a plumber because you do some minor repairs or are you a bonafide journeyman?
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Old 07-08-2019, 03:06 PM   #6
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Re: Sudden Drop In Water Pressure


Moving along...

Last edited by Thebestnthewest; 07-08-2019 at 03:10 PM.
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Old 07-08-2019, 03:10 PM   #7
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Re: Sudden Drop In Water Pressure


Who's arguing?

You have been asked legitimate questions that you do not answer.
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Old 07-08-2019, 03:52 PM   #8
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Re: Sudden Drop In Water Pressure


This is how contractors get a bad reputation, someone asks a question. " And who are you? " What does that matter? The resolution is what matters. Please dont represent a contractor or plumber if you have nothing positive to contribute its about working together not against eachother. The attitude gets you terminated from the jobs and your contract cancelled and another tradesman makes the construction industry look like adult children. Thank you.

The only thing I havent checked is a dip tube & Im thinking thats it.
Thanks for demonstrating that we gotta alota work in a business like aspect and not a personal like aspect.

Last edited by Thebestnthewest; 07-08-2019 at 03:56 PM.
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Old 07-08-2019, 04:05 PM   #9
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Re: Sudden Drop In Water Pressure


Quote:
Originally Posted by Thebestnthewest View Post
16 unit apartment complex

1 bath 1 Kitchen 1 dishwasher each. replaced this water heater on this building and now the whole hot water system is lower and it seems like the cold is too.



The systems dropped by anywhere from 10-15-20 lbs.



Im currently at 70 lbs with all the irrigation going we've lost anywhere from 20 - 30 lbs of pressure.



It'll be pressurized pushing around 85-80 and then get a gradual drop by 10- 15 lbs after I starting using the shower hot water.



I cant see the hot water heater but im assuming its around 80-100 gal 18,000 btu gas water heater.



I've checked all the basics.



All valves are fully open, all aerators and mixing valves are clean.



Doesnt look like any piping has been downsized on inlet or outlets.





I'm not sure if they purged the system for air but assume they did & I did a kitchen sink purge myself but I dont think its effective because everybody else in the building would have to have everything closed and off for the sink purge to be effective.



According to water heater manufacturers the volume isnt restricted in water heaters so even if the water heater didnt have the capacity and btu to supply the building the volume of water wouldnt be restricted and not cause lower pressure just the water wouldnt get hot enough.



They added an inline pump but it did hardly anything at all.



I saw something that looked like a check valve that looked like it might be restricting the flow. it looked like a double sided bell fitting but it was one entire piece and i cant indentify the fitting so im assuming its a check valve even though it doesnt quite look like its tapered on each side and narrow in the middle.



I didnt see any expansion tank on this system though to test it.



Im assuming the prv is still good since its been only installed a month ago.



Any thoughts on the culprit and the resolution?



Im assuming it's that fitting I cant indentify cause it wasnt me who installed this.



Thanks
I'm assuming. I'm assuming. the mother of all f ups is from assumptions.
your hesitations to answer if you are a real plumper is red flag on this forum.
check the prv pressure! your a plumber hey?

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Old 07-08-2019, 04:05 PM   #10
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Re: Sudden Drop In Water Pressure


we ask questions to help us determine the problem and to ascertain your skill level in resolving the issue.

you list your trade as an "assistant back end super".

i have no idea what that title means nor does it give us any insight as to your knowledge/skill/abilities.

in your op you make several broad assumptions that a real plumber would not make.

you come across posing like you are a plumbing pro, however, when your statements or methods are questioned you become irritated.

there is a tremendous amount of experience & knowledge on this forum held by contractors and bonafide tradesmen.

one thing we as a whole are very adept at is sniffing out posters who are neither a contractor or tradesman.
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Old 07-08-2019, 06:10 PM   #11
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Re: Sudden Drop In Water Pressure


Sounds like a problem with the Knudson valve.
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Old 07-08-2019, 06:12 PM   #12
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Re: Sudden Drop In Water Pressure


Quote:
Originally Posted by griz View Post
we ask questions to help us determine the problem and to ascertain your skill level in resolving the issue.

you list your trade as an "assistant back end super".

i have no idea what that title means nor does it give us any insight as to your knowledge/skill/abilities.

in your op you make several broad assumptions that a real plumber would not make.

you come across posing like you are a plumbing pro, however, when your statements or methods are questioned you become irritated.

there is a tremendous amount of experience & knowledge on this forum held by contractors and bonafide tradesmen.

one thing we as a whole are very adept at is sniffing out posters who are neither a contractor or tradesman.
Dammit Dad !
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Old 07-08-2019, 09:24 PM   #13
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Re: Sudden Drop In Water Pressure


I was getting a little chubby, waiting to post, now coitus interuptus...

Check the one way energy saving check balls if used above the new Water heater.

most likely solder lumps on a valve face by over soldering by amateurs...

Divide and conquer, open the line up, install an accurate high flow regulator, measure the gallon per minute in a bunch of 5 gallon buckets or read the meter....over a set time period.

Did you check with the water department for a change in service pressure????

Serviced the various screens and filters as needed?????

Pex loops that collapse/kink up under partial pressure ??????

Foreign matter in the supply lines.....

80 gallons of hot water for 16 units = over priced Flop House IMHO.

You sir are slum superintendent.....
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Old 07-09-2019, 10:06 AM   #14
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Re: Sudden Drop In Water Pressure


No, he's an assistant back end super...

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Old 07-09-2019, 09:09 PM   #15
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Re: Sudden Drop In Water Pressure


I'd love to find out what stumped the "back End Superintendent"

Please post the answer.

My next employee that wants a raise, get the title of "Back End super"

And a tee shirt with the title printed on it....
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Old 07-09-2019, 10:59 PM   #16
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Re: Sudden Drop In Water Pressure


Quote:
Originally Posted by Thebestnthewest View Post
16 unit apartment complex
1 bath 1 Kitchen 1 dishwasher each. replaced this water heater on this building and now the whole hot water system is lower and it seems like the cold is too.

The systems dropped by anywhere from 10-15-20 lbs.

Im currently at 70 lbs with all the irrigation going we've lost anywhere from 20 - 30 lbs of pressure.

It'll be pressurized pushing around 85-80 and then get a gradual drop by 10- 15 lbs after I starting using the shower hot water.

I cant see the hot water heater but im assuming its around 80-100 gal 18,000 btu gas water heater.

I've checked all the basics.

All valves are fully open, all aerators and mixing valves are clean.

Doesnt look like any piping has been downsized on inlet or outlets.


I'm not sure if they purged the system for air but assume they did & I did a kitchen sink purge myself but I dont think its effective because everybody else in the building would have to have everything closed and off for the sink purge to be effective.

According to water heater manufacturers the volume isnt restricted in water heaters so even if the water heater didnt have the capacity and btu to supply the building the volume of water wouldnt be restricted and not cause lower pressure just the water wouldnt get hot enough.

They added an inline pump but it did hardly anything at all.

I saw something that looked like a check valve that looked like it might be restricting the flow. it looked like a double sided bell fitting but it was one entire piece and i cant indentify the fitting so im assuming its a check valve even though it doesnt quite look like its tapered on each side and narrow in the middle.

I didnt see any expansion tank on this system though to test it.

Im assuming the prv is still good since its been only installed a month ago.

Any thoughts on the culprit and the resolution?

Im assuming it's that fitting I cant indentify cause it wasnt me who installed this.

Thanks
you blew it right there. it's a "water heater" not a "hot water heater"

sounds stupid because you don't heat water that's already hot
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Old 07-09-2019, 11:36 PM   #17
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Re: Sudden Drop In Water Pressure


Quote:
Originally Posted by Fouthgeneration View Post

80 gallons of hot water for 16 units = over priced Flop House IMHO.

You sir are slum superintendent.....
Good find. I got two 50 gallon tanks in my 6 bedroom house .
We turn on the 2nd tank when we have friends and family stay over.
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Old 07-10-2019, 12:19 PM   #18
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Re: Sudden Drop In Water Pressure


re the OP post:Couple times in the distant past have had an issue where shutoff valve did not reopen fully.
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Old 07-10-2019, 04:24 PM   #19
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Re: Sudden Drop In Water Pressure


Quote:
Originally Posted by Irishslave View Post
you blew it right there. it's a "water heater" not a "hot water heater"

sounds stupid because you don't heat water that's already hot
Don't they sell those at the same place you buy soft water softeners?
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Old 07-10-2019, 04:30 PM   #20
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Re: Sudden Drop In Water Pressure


Quote:
Originally Posted by rselectric1 View Post
Don't they sell those at the same place you buy soft water softeners?
Near the post holes...

Often close to the gronesteel valves...

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