I get a thumping noise in my home, and I can't pinpoint where it is coming
from. I think it's associated with the plumbing because it usually starts w
hen I run the sink. Is this possible? Does plumbing make noises like that?
And if so should I just get any plumber or do I need to get someone special
g from. I think it's associated with the plumbing because it usually starts
when I run the sink. Is this possible? Does plumbing make noises like that
? And if so should I just get any plumber or do I need to get someone speci
*Try running hot water down your sink. You may hear the sound that you are
referring to. If so it is probably the plastic drain pipe moving as a res
ult of heat expansion. Pretty common with plastic pipes.
pinpoint where it is coming from. I think it's
associated with the plumbing because it usually
starts when I run the sink. Is this possible?
Does plumbing make noises like that? And if so
should I just get any plumber or do I need to
get someone special?
For diagnostic, I'd leave the faucet thumping,
and go around listening. Touch different plumbing
things like pressure reducer.
Let us know what you find. It's probably an easy fix.
Christopher A. Young
Learn about Jesus
You already know about the 'ticking' or some type noise that you hear the
plastic pipes dowhen running hot water through them.
However, I once had 'thumping' noise sometimes when ran water, sometimes
just on its own. Overtime went away, until...no hot water! Seems the
electric water heater element was shorting out through the water [until
completely burned up] and was acting like the boiler section of a coffee
pot, thus the thumping. Water boiling and making a thumping noise.
You can check by turning off breaker, disconnect lead to heating element
and measure resistance between the tank [should be huge, infinite] and
between the two elements, around 8 to 13 ohms depending. If higher, big
problems [my hot water tank has two elements so must disconnect at the
element to make any measurements. Plus, the advantage of two elements is
have one to compare to!]
Can you say a little more about what happens, when it happens, what it
sounds like, is it constant thumping or a one-time thump, can you reproduce
the noise or make it happen when you want to, etc?
If you post back, people here can probably help you figure it out. But, if
all you do is post one time with only limited information, you probably
won't get it figured out here.
1) Not necessarily correct. It depends on what he hears, when, where etc.
before being able to say what the actual problem is. But, yes, it could be
a water hammer.
2) "Col. Edmund Burke" -- could you please stop posting all of the other off
topic nonsense types of posts like the ones that you have recently been
posting to this group? Thanks.
Thanks to everyone except Micky and Edmund Burke.
I got some more data. I came home, no noise. I ran a sink full of cold wat
er, no noise. I ran a sink full of hot water, and for the next hour I got
that thump noise. It seems to come from the crawl space. Also, I noticed th
at the hot water heater makes a noise too. Like there is something popping
inside it. The heater is only eight years old, but I admit I never had it f
lushed. But the thump under the crawl space is what bothers me. It seems to
come long after I turn off the hot water. I'd say I get only a thump every
5-10 minutes, and it stops altogether after about 1 hour.
> ;3315754']Thanks to everyone except Micky and Edmund Burke.
> water, no noise. I ran a sink full of hot water, and for the next hour
> I got that thump noise. It seems to come from the crawl space. Also, I
> noticed that the hot water heater makes a noise too. Like there is
> something popping inside it. The heater is only eight years old, but I
> admit I never had it flushed. But the thump under the crawl space is
> what bothers me. It seems to come long after I turn off the hot water.
> I'd say I get only a thump every 5-10 minutes, and it stops altogether
> after about 1 hour.
Just about any kinda loud noise coming from the water heater is not
good, especially popping or wheezing noises. It's an indication that
you have scale forming on the hottest parts of that heater, which would
be the bottom on a gas fired heater or the elements on an electric.
Either way, it indicates that the heating elements or the glass lined
tank itself is on it's last legs.
What happens is that as the scale forms on the hottest areas, pockets of
water are trapped in the scale. The water in those water pockets gets
heated to well above the normal boiling point of water, and as the
pressure of that water caues the scale to break, the heater will make
popping or wheezing noises.
Here, skim through this:
The above is instructions on how to dissolve the accumulated scale in a
gas fired hot water heater using a deliming acid. The idea here is to
dissolve the lime scale at the bottom of a gas fired water heater to
maximize it's lifespan. Scale forming on the bottom of the heater
effectively insulates the water from the metal bottom of the tank,
thereby causing the metal bottom to become much hotter than it otherwise
would get during each heating cycle, and that overheating of the metal
promotes early tank failure.
If the thumping noise is coming from the crawl space after running the
hot water, my guess would be it's due to the expansion and subsequent
contraction of one of the hot water supply pipes rubbing against a floor
joint and causing a noise as it moves. You can isolate the pipe and the
location where the noise is being created with a mechanic's stethoscope
as described in my last post. If you find that's what's causing the
noise, you can eliminate it by squirting some graphite powder between
the pipe and the floor joist. Graphite powder is a natural lubricant
that will cause the pipe to slide against the wood rather than rub on
Have you definitely established that it is only related to hot water usage,
and never is heard when you use the cold water,over a period of a couple o
f days minimum?..Your last post sounded like that was the case, but just ch
ecking to make absolutely clear before we move on with suggestions.
It doesn't seem to be water "hammer". That occurrs when water is flowing a
nd then you abruptly turn it off at the faucet and the water in motion slam
s agains the suddenly shut valve making the hammer/clanking noise. It will
if you shut the water flow off slowly.
Interesting information. I didn't know that about hot water tank scale, the
noises that it can create, and the possible ways to remove some or all of
the scale from the tank. The corrected link is:
Then, I decided to look up Un-Lime and I found this link that says that it
costs $270 for 4 gallons of the stuff:
My understanding is that A. O. Smith has stopped selling Unlime, and I
have no doubt that the reason for that is that is that no one was buying
Here's the MSDS for A. O. Smith Unlime:
It's nothing more than phosphoric acid, which you can buy at any
janitorial supply store listed under "Janitorial Equipment & Supplies"
in your yellow pages phone directory.
That MSDS sheet doesn't say what the concentration of phosphoric acid is
in Unlime, but it's been my experience that it really doesn't matter. I
have used both strong phosphoric acid and strong hydrochloric acid on
enameled steel bathtubs and neither one would hurt the enamel. The
inside of your hot water tank is enameled steel just like a steel bath
You can buy Buckeye "Sparkle" which is 40 percent phosphoric acid (which
is the strongest phosphoric acid product I know of) at any janitorial
supply house that carries Buckeye International products. It's sold in
quart size bottles, but it's nowhere near a quarter of $270. I haven't
bought it in a long time, but my guess would be that it'd be less than
$20 per quart.
Apex Engineering makes a product called "Rydlyme", which is a 10%
hydrochloric acid product made especially for deliming boilers. I
import it from Apex Engineering for about $100 for a 4 gallon case, but
nearly half of that cost is shipping.
Commercial toilet bowl cleaners will typically either be gelled
phosphoric acid or gelled hydrochloric acid, and you can buy either one
of them from any janitorial supply store.
I'd say that if you used any fairly strong phosphoric acid product,
you'd get the same results as using Unlime. It just may take less or
more time to completely dissolve all the lime. Also, once the lime is
dissolved, the acid will not harm the enamel coating on the inside of
your water heater. Confirm by using some acid on your enameled steel
bathtub or enameled steel stove cook top.
Also, Buckeye Sparkle is sold by the quart, the gallon, by the 30 gallon
drum and by the 55 gallon barrel.
If anyone is having trouble finding that A. O. Smith link on descaling
water heaters, just use Google (or whatever) to look for the text:
Why When & How to remove water scale from tank type glass-lined water
and you should be right near the top of the Google search results list.
You don't necessarily need to stop movement of the pipe. If you just
change the movement of the pipe from rubbing against the joist to
sliding against the joist, you'll eliminate the noise associated with
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