Hi All,
I have a very weired problem in my basement bathroom:
Sometimes when I flush the toilet, it sounds like the system is
over-pressured -terrible, terrible sound is coming out of the pipe
connected to the toilet supply line, the supply line itself starts
going *crazy* moving from side to side. It stops doing so after 2-3
seconds.
I suspect some water pressure issues (I can't think about anything
else). I don't get how can this kind of problem exist in a single
pipe, while all other pipes in the house are connected. Is that
possible that over-pressure exists in a single end of the house water
system?
Is that possible that toilet tank can cause such an effect?
My biggest concern is that there is over-pressure in the system and it
might burst.

Thanks a lot for any advice.

I expect perhaps you need dampers on your input down there. Most
plumbers will sweat in a vertical pipe which provides a capped off air
column. Air will compress . . . water won't. At least not by much.

Mark 'Sporky' Stapleton
Watermark Design, LLC
http://www.h2omarkdesign.com

wrote:

Hi All,
I have a very weired problem in my basement bathroom:
Sometimes when I flush the toilet, it sounds like the system is
over-pressured -terrible, terrible sound is coming out of the pipe
connected to the toilet supply line, the supply line itself starts
going *crazy* moving from side to side. It stops doing so after 2-3
seconds.
I suspect some water pressure issues (I can't think about anything
else). I don't get how can this kind of problem exist in a single
pipe, while all other pipes in the house are connected. Is that
possible that over-pressure exists in a single end of the house water
system?
Is that possible that toilet tank can cause such an effect?
My biggest concern is that there is over-pressure in the system and it
might burst.

Thanks a lot for any advice.

wrote:

Hi All,
I have a very weired problem in my basement bathroom:
Sometimes when I flush the toilet, it sounds like the system is
over-pressured -terrible, terrible sound is coming out of the pipe
connected to the toilet supply line, the supply line itself starts
going *crazy* moving from side to side. It stops doing so after 2-3
seconds.
I suspect some water pressure issues (I can't think about anything
else). I don't get how can this kind of problem exist in a single
pipe, while all other pipes in the house are connected. Is that
possible that over-pressure exists in a single end of the house water
system?
Is that possible that toilet tank can cause such an effect?
My biggest concern is that there is over-pressure in the system and it
might burst.

Thanks a lot for any advice.

Not air, not pressure.

Most likely the ballcock (fill valve) inside the toilet tank is
at fault. The other possibility is that the supply shutoff valve
(under the tank where the water line comes in) is partially closed.
Those small stop valves must be completely open or they may vibrate.

Could be a loose washer in the supply valve also.

Jim

Sporkman wrote in message ...
I expect perhaps you need dampers on your input down there. Most
plumbers will sweat in a vertical pipe which provides a capped off air
column. Air will compress . . . water won't. At least not by much.

Mark 'Sporky' Stapleton
Watermark Design, LLC
http://www.h2omarkdesign.com

wrote:

Hi All,
I have a very weired problem in my basement bathroom:
Sometimes when I flush the toilet, it sounds like the system is
over-pressured -terrible, terrible sound is coming out of the pipe
connected to the toilet supply line, the supply line itself starts
going *crazy* moving from side to side. It stops doing so after 2-3
seconds.
I suspect some water pressure issues (I can't think about anything
else). I don't get how can this kind of problem exist in a single
pipe, while all other pipes in the house are connected. Is that
possible that over-pressure exists in a single end of the house water
system?
Is that possible that toilet tank can cause such an effect?
My biggest concern is that there is over-pressure in the system and it
might burst.

Thanks a lot for any advice.

Yep, sounds like a water hammer problem to me too. It does neet an
air chamber to absorb the force.

Harry K

Thank you guys for the advices.

I'll check the shut-off valve and fill valve as Jim has mentioned.
In case that's not the problem, where are the air chamber or dump
installed? What do they do exactly?

Thanks a lot

wrote in message
om...

I have a very weired problem in my basement bathroom:
Sometimes when I flush the toilet, it sounds like the system is
over-pressured -terrible, terrible sound is coming out of the pipe
connected to the toilet supply line, the supply line itself starts
going *crazy* moving from side to side. It stops doing so after 2-3
seconds.

This is more probably water hammer than anything
to do with main water pressure..

--
Don Phillipson
Carlsbad Springs (Ottawa, Canada)

wrote:

Thank you guys for the advices.

I'll check the shut-off valve and fill valve as Jim has mentioned.
In case that's not the problem, where are the air chamber or dump
installed? What do they do exactly?

Thanks a lot

What I'm saying is that there may actually be no damping air column pipe
(forgotten the darn terminology) as there should be. If one exists it
would probably be in a basement stud wall since the toilet is in the
basement. Could be between the floor joists above. It's just a Tee
fitting with a bit of pipe above it closed off at the top. 'S at least
possible that the top of the pipe wasn't effectively sealed, allowing
the air to leak out until there's no more air column (just a water
column), completely cancelling the effectiveness of the damping.

Mark 'Sporky' Stapleton
Watermark Design, LLC
http://www.h2omarkdesign.com

On Tue, 25 May 2004 21:36:05 -0400, someone wrote:

Sometimes when I flush the toilet, it sounds like the system is
over-pressured -terrible, terrible sound is coming out of the pipe

This is more probably water hammer than anything
to do with main water pressure..

Yeah. Is that what OP thinks "over pressured" sounds like? Or to put
it another way, what about that sounds makes him think it means
"over-pressured".

Maybe its the valve in the toilet. Now, it could indeed be
pressure-related in that there is some combination or balance of
pressure and flow that is causing a harmonic motion. Change some
parameter and it won't be in harmony any more.

-v.