Pressure Test Water Rough-in - Plumbing - DIY Home Improvement | DIYChatroom

Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Plumbing


Thread Tools Display Modes
Old 06-23-2008, 12:38 PM   #1
Join Date: Mar 2008
Posts: 149
Rewards Points: 75

Pressure test water rough-in

To properly test water rough in shouldn't all the air be bleed out of the pipes and then pressurize to 100psi to test. I had one plumber tell me the air in the pipe does not matter. Seems like it would be hard to find a leak if it does not blow the pipe apart.


BillyD is offline   Reply With Quote
Old 06-23-2008, 01:06 PM   #2
RippySkippy's Avatar
Join Date: Feb 2007
Location: Ames, Iowa
Posts: 1,233
Rewards Points: 500

I don't think I've ever pressure tested lines with anything but air...when give a choice. Use air, and if you lose pressure then look for the hissing. If you can't find the hisses, you can always use the Oatley leak detector on every connection, I've used diluted soap with good results.


when it comes to breakfast, the chicken is dedicated, the pig is committed.
RippySkippy is offline   Reply With Quote
Old 06-24-2008, 02:12 PM   #3
Licensed Master Plumber
mstplumber's Avatar
Join Date: May 2008
Location: Atlanta, GA USA
Posts: 211
Rewards Points: 150

I really don't think air in the lines matters because the air will be pressurized to the same pressure as the water pressure in the pipes. The problem is getting enough pressure to get a good test.

If you can get one, a hydrostatic pump gives the best test. This may sound like a big deal but it's really not. This is just a hand operated pump that has a water reservoir attached. You use a washing machine hose to pressurize the system through the washing machine box or a hose faucet. This allows you to pump the lines up to 200- 300 psi. If you have a leak, you WILL find it.
You can probably rent one of these for a few bucks if you call around.

I have tested with air a lot but if there is a lot of noise it is sometimes hard to hear a leak. If you have a leak while testing with water, you can see it. Also, when using plastic piping, especially CPVC, there is a danger of "shrapnel" if someone accidentally breaks the pipe while it is pressurized.

Check out my goofy video for my new toilet repair book.
mstplumber is offline   Reply With Quote

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Water pressure and temperature billvasko Plumbing 9 06-02-2008 09:23 AM
Low Water Pressure Eagle2 Plumbing 5 05-28-2008 10:29 PM
No water pressure in my pressure tank GordH Plumbing 6 05-18-2008 11:19 AM
Help with low pressure cold water upstairs lewissv Plumbing 5 01-26-2007 08:05 AM
New Help With Improving Water Pressure hayhursm Plumbing 1 01-31-2006 06:55 PM

Top of Page | View New Posts


Search Engine Friendly URLs by vBSEO 3.6.1