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Old 03-22-2012, 08:18 PM   #46
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Need Advice on how to Correct Low Water Pressure


HRG

How does sediment get into the lines. When I was getting water to measure a gallon the cold water was discolored until the water ran for about 5 minutes.

No one used the water all day after my wife left for work until I got home at 3:30.

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Old 03-23-2012, 06:15 AM   #47
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Need Advice on how to Correct Low Water Pressure


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HRG

I did the test you described. I had to use a measured test 1 gal. I could not get the 5 gallon bucket under the hose bib.

Test 1. from the hose bib it took 40 seconds to fill 1 gal.

Test 2. from the tub it 50 seconds to fill 1 gal. I did both hot and cold from the tub times were identical.

If my math was right it would have take 3.3 minutes to fill 5 gallons at the hose bib. And 4.2 minutes in the tub for the same volume
Fifty seconds to fill 1 gallon = 1.2 gallons per minute. Your water flow is quite slow. I believe the max flow of 6 gallons per minute for 1/2" pipe that I listed earlier is for the pipe only without any faucet restrictions. Depending on your faucets, the flow will be less. But 1.2 gallons per minute is quite low.

I timed filing one gallon in our bathtub. It took 9 seconds to fill one gallon from either the cold or hot water faucet.

HRG
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Old 03-23-2012, 06:30 AM   #48
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Need Advice on how to Correct Low Water Pressure


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Originally Posted by Joe Tilghman View Post
HRG

How does sediment get into the lines. When I was getting water to measure a gallon the cold water was discolored until the water ran for about 5 minutes.

No one used the water all day after my wife left for work until I got home at 3:30.
If it was the hot water, it probably would have been from your water heater. But for 5 minutes from a cold water line, maybe there's an internally corroded galvanized line from the city to your house. That could explain your low water flow.

1. Does it take 40 to 50 seconds to fill one gallon from every faucet in your home?

2. Do you get discolored water from all of your cold faucets or only that one faucet?

HRG
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Old 03-23-2012, 09:40 AM   #49
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Need Advice on how to Correct Low Water Pressure


I can check the flow from the kitchen sink tonight when I get home.

I plan to call the utilities department to see if they have done any testing of mains or fire hydrants. Their web page explains this is the cause of discolored water and to run for 5 minutes. That did clear it up, I checked first thing this morning by running some water in a glass and it was clear.

If I have 60 psi at the front hose bib closest to incoming water the city will claim that there is nothing wrong with their end of the pipe but I may still ask if they can check pressure.

I don't guess adjusting at PRV to 70 psi will do much good.

My wife sent me an e-mail and said the water in the toilet bowl was stained.

I don't see any staining in the hot water but if I see staining in cold water sediment is getting into the tank plan to drain and flush Saturday.

My gut still tells me that the trunk line should have been 3/4" and feeds from there would be 1/2" to fixtures. I'm concerned about plunking cash down to redo some of the lines and it not correct the problem.
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Old 03-23-2012, 12:45 PM   #50
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Need Advice on how to Correct Low Water Pressure


Quote:
Originally Posted by Joe Tilghman View Post
I can check the flow from the kitchen sink tonight when I get home.

I plan to call the utilities department to see if they have done any testing of mains or fire hydrants. Their web page explains this is the cause of discolored water and to run for 5 minutes. That did clear it up, I checked first thing this morning by running some water in a glass and it was clear.

If I have 60 psi at the front hose bib closest to incoming water the city will claim that there is nothing wrong with their end of the pipe but I may still ask if they can check pressure.

I don't guess adjusting at PRV to 70 psi will do much good.
No need to ask the city to check their pressure. Just adjust your water pressure regulator (reducing valve) to max pressure. That will be the pressure from the city.

Static water pressure is different from water flow. If you have a constricted galvanized pipe from the city to your home, you can still have 60 psi out of your pressure regulator but low water flow from the city.

Quote:
My wife sent me an e-mail and said the water in the toilet bowl was stained.

I don't see any staining in the hot water but if I see staining in cold water sediment is getting into the tank plan to drain and flush Saturday.
Draining and flushing your water heater would be a good idea.

Quote:
My gut still tells me that the trunk line should have been 3/4" and feeds from there would be 1/2" to fixtures. I'm concerned about plunking cash down to redo some of the lines and it not correct the problem.
I really doubt that installing 3/4" trunk lines will correct your problem. Look at it this way. Homes plumbed in PEX can also be plumbed in the "Home Run" configuration where there's a 3/4" or 1" line feeding a manifold "right after the pressure regulator". Then there are 3/8" lines from the manifold to each fixture with 1/2" or 5/8" lines to the bathtubs. Out of the hot water heater, there's a manifold similar to the cold water manifold. These Home Run systems work fine.

You effectively have a Home Run system with your 1/2" trunk lines so long as you only open one cold and one hot faucet in your bathroom. There's one 1/2" line feeding the cold and one 1/2" line feeding the hot just like in a Home Run system. So opening a cold water faucet or flushing the toilet (also cold water) should not affect the flow of water from the hot water faucet and certainly not cut the water flow in half.

If you are determined to replace the 1/2" trunk lines with 3/4" trunk lines, try this test first. Install one hot and one cold 3/4" PEX trunk lines to your bathroom by just laying them on the floor from the source to the destination. This way, you don't have to open up walls or anything except at the source and destination. If there's no change, then you just saved yourself a ton of work and money.

HRG

Last edited by Homerepairguy; 03-23-2012 at 12:50 PM.
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Old 04-12-2012, 07:45 PM   #51
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Need Advice on how to Correct Low Water Pressure


Wouldn't the landlord be checking this out for you and get a plumber in there to fix this rental?
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Old 04-13-2012, 12:11 PM   #52
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What does the landlord have to say to fix it

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