DIY Home Improvement, Remodeling & Repair Forum > DIY Home Improvement > Plumbing Forum > knocking sound only when water is off




Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old 10-20-2011, 04:41 PM  
isola96
Senior Member
 
isola96's Avatar
 
Join Date: Oct 2011
Location: Lagrangeville, New York
Posts: 437
Liked 6 Times on 6 Posts

Default

Quote:
Originally Posted by awalts
Nope, I have a normal gas heating system, not a hydronic one. The pipes are just cold water lines coming off the main and heading to the outside spigots. The tags were put on by the house inspector just marking what each valve does (front, back, water heater etc). I'll turn off the toilet (s) this weekend - I wanted to do it when I was home for a decent amount of time.
We're does the shut off that is on the off position go?.. And why is it off?....

You have or don't have your heat on
Is it controlled at the radiator or thermostats.


__________________
isola96 is offline  
 
Reply With Quote Quick reply to this message
Old 10-23-2011, 02:59 PM  
awalts
Junior Member
 
Join Date: Oct 2011
Posts: 8
Default

I turned off the water to each toilet (and then all of them at the same time), and the knocking still persists.

The two valves (one shut off, one not) go to the outside spigots (front and back). The knocking sound occurs regardless of their on/off setting.

Lastly, another video of the knocking. Sorry for the initial camera movement. The knocking comes on very suddenly at the 19 second mark, grows in intensity and volume, and then stops after about 4 seconds. It starts and stops in spurts like this, sometimes once or twice, sometimes many times over a 30 minute period.


If it is the pressure reducing valve, any thoughts on how much that costs to replace?


__________________
awalts is offline  
 
Reply With Quote Quick reply to this message
Old 11-06-2011, 06:50 PM  
awalts
Junior Member
 
Join Date: Oct 2011
Posts: 8
Default

I have an update to add to this knocking issue ...

I bought a pressure meter and attached it one of the outdoor spigots. Normally the water pressure is about 70 psi and the needle does not move. However, when the knocking sound occurs, the needle shakes/fluctuates between 60 and 70 psi. So long as the noise is being made, the needle shakes. As soon as the knocking stops, the needles returns to holding steady at 70psi.

Any thought now on what needs to be fixed?
Thanks again
Avram

__________________
awalts is offline  
 
Reply With Quote Quick reply to this message
Old 11-06-2011, 07:29 PM  
joecaption
Senior Member
 
Join Date: Jan 2011
Location: Hartfield VA, VA
Posts: 1,361
Liked 37 Times on 32 Posts
Likes Given: 2

Default

Any chance there's a recirulating pump on the hot water line? It cirulates the water so as soon as a taps turned on the waters hot.

__________________
joecaption is offline  
 
Reply With Quote Quick reply to this message
Old 11-06-2011, 07:52 PM  
paul52446m
Senior Member
 
Join Date: Oct 2010
Location: Houghton Lake, Mi.
Posts: 435
Liked 1 Times on 1 Posts

Default knocking sound only when water is off

Quote:
Originally Posted by awalts View Post
I have an update to add to this knocking issue ...

I bought a pressure meter and attached it one of the outdoor spigots. Normally the water pressure is about 70 psi and the needle does not move. However, when the knocking sound occurs, the needle shakes/fluctuates between 60 and 70 psi. So long as the noise is being made, the needle shakes. As soon as the knocking stops, the needles returns to holding steady at 70psi.

Any thought now on what needs to be fixed?
Thanks again
Avram
I am not a plumber, but I have had two different Gas regulator, one LP and one Nat gas, that were a little to much clearance in side so when they would operate at times they would not only go up and down, they would violently vibrate and raddled all the gas piping in the house. Have you had them change the regulator yet. When that happened to me the first time i could not believe the noise it made. I had just put the new boiler system in so the regulator was new but defective. Paul
__________________
paul52446m is offline  
 
Reply With Quote Quick reply to this message
Old 11-06-2011, 08:11 PM  
isola96
Senior Member
 
isola96's Avatar
 
Join Date: Oct 2011
Location: Lagrangeville, New York
Posts: 437
Liked 6 Times on 6 Posts

Default

So when exactly does the sound accrue?
Did we eliminate heat? Because it happens when the heat is off?
Is anything running dishwasher shower ect? How do we know that it's hot water line we don't so how about fluid master goes bad happend to me a few times it made the hole line shake like crazy I thought it was a ball valve not opened all the way but no it was fluid master.
Turning on the out side spickit could cause this as if you have alot of pressor in your lines check your boiler and or hot water heater check for feeder valves to either boiler or tank to give it water.
If any circulators u have feel them make shore they are not over heating.

__________________
isola96 is offline  
 
Reply With Quote Quick reply to this message
Old 11-07-2011, 05:03 AM  
joecaption
Senior Member
 
Join Date: Jan 2011
Location: Hartfield VA, VA
Posts: 1,361
Liked 37 Times on 32 Posts
Likes Given: 2

Default

70 PSI is a whole lot more then I've ever seen a fresh water system set it. The highest I've seen is 50 PSI, and I've worked on and built hundreds of homes in my life time.

__________________
joecaption is offline  
 
Reply With Quote Quick reply to this message
Old 11-07-2011, 07:14 AM  
Speedbump
Water well etc.
 
Speedbump's Avatar
 
Join Date: Apr 2009
Location: Riverview, Fl.
Posts: 414
Liked 20 Times on 19 Posts
Likes Given: 1

Default

Quote:
70 PSI is a whole lot more then I've ever seen a fresh water system set it. The highest I've seen is 50 PSI, and I've worked on and built hundreds of homes in my life time.
The only time I had city (county) water in my entire life was ten years ago and that static pressure was 85 psi.
__________________
FAQ's
Speedbump is offline  
 
Reply With Quote Quick reply to this message
Old 11-16-2011, 11:47 AM  
evstarr
Junior Member
 
Join Date: Nov 2011
Posts: 27
Default

Have you been lucky enough to be able to time it so you can actually touch the various pipes while the knocking is going on to see if it's a particular line?

__________________
evstarr is offline  
 
Reply With Quote Quick reply to this message
Old 11-18-2012, 11:56 AM  
parmila2000
Junior Member
 
Join Date: Nov 2012
Posts: 1
Default

Any luck in finding what the real problem was?...we are facing the same issue in our house....please help



__________________
parmila2000 is offline  
 
Reply With Quote Quick reply to this message
Reply


Quick Reply
Message:
Options

Thread Tools Search this Thread
Search this Thread:

Advanced Search
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 On
Refbacks are On


Similar Threads
Thread Thread Starter DIY Home Repair Forum Replies Last Post
Knocking water pipes Katie21 Plumbing Forum 6 06-25-2013 03:01 PM
Toilet has Tingling Water Sound Constantly Sharoon Plumbing Forum 13 01-03-2013 03:04 PM
Pipe Knocking broke Plumbing Forum 14 12-14-2010 11:21 AM
Rhythmic knocking bilghali Plumbing Forum 3 03-05-2009 09:07 AM
Knocking down a wall beachy Framing and Foundation 8 09-26-2005 09:56 PM