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09-27-2011, 03:57 PM
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#1
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3 Rivet Member
1967 20' Globetrotter
denver
, Colorado
Join Date: Aug 2010
Posts: 153
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Shur-Flo pump is Too Loud
I purchased and installed a low capacity (2.5 gpm) shur-flo pump this winter along with all new PEX water lines. The pump is resting directly on the floor with four screws right next to the water tank. The problem is, when I open a valve, it sounds like a train is running through my Airstream.
I am trying to figure out ways to dampen/solve the loud noise. I realize there is noise associated with a pump but I'm hoping to lower the sound a bit.
I usually don't add a lot of water into the tank because the demand is not there and I don't want the extra weight. Could some of the sound be caused by air in the lines because I am not carrying enough water? Could it be the rigid PEX pipe that runs along the street-side wall? Or is it because the pump is resting directly on the plywood flooring?
Thank you.
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09-27-2011, 04:31 PM
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#2
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Rivet Master
Join Date: Mar 2003
Posts: 2,190
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I hear ya....
I put foam pipe insulation around the pipes on both sides of the pump. The pipes were touching various furniture framing. The next step for me is to
mount the pump on a piece of plywood. I'll mount the plywood on top of a piece of scrap carpet, and screw the new plywood mount to the floor using rubber washers. ( grommets will work ) I mounted my inverter this way so vibration
wouldn't loosen any components on the circuit board.
It might help.
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09-27-2011, 04:31 PM
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#3
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Moderator
2017 26' Flying Cloud
Alamo Heights
, Texas
Join Date: Aug 2006
Posts: 8,534
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I think it's a combination of semi-rigid piping and bolting the pump directly to the plywood resonator..er... floorboard. You can go a long way toward determining which it is by unscrewing the pump from the floor and holding it up off the plywood while someone opens a tap. You'll still get most of the noise that the pipes transmit (minus a little because your hands will damp the pump's vibration more than the solid mount it was on before.)
If it's quiet enough like that, you need some sort of rubber isolators between the plywood and the pump. If it's still too noisy, you may also need a bit of more-flexible line to join the pump to the pex.
__________________
— David
Zero Gravitas — 2017 Flying Cloud 26U | WBCCI# 15566
He has all of the virtues I dislike and none of the vices I admire. — Sir Winston Churchill
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09-27-2011, 04:32 PM
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#4
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Rivet Master
2008 27' Classic FB
Burkburnett
, Texas
Join Date: Jul 2010
Posts: 985
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Some pumps sound louder than others. Were there rubber grommets or feet that isolate the pump from the floor? Floating the pump on a sandwich of plywood and soft foam rubber will help reduce some of the noise. Some of the noise is also telegraphed through rigid plumbing to the tank and floor. Using flexible lines forming a loop to the inlet and output can be helpful in reducing the noise.
__________________
AIR 47751
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09-27-2011, 04:47 PM
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#5
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3 Rivet Member
2011 23' FB International
2007 20' Safari
Irvine
, California
Join Date: Oct 2008
Posts: 147
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I replaced my pump with variable speed pump which lowered the noise substantially. I paid $159 for the 4.5 gpm shurflow pump on-lin purchase. The pump was slightly taller, however, it fit in the original pump location. The electrical wiring is identical to the exisiting pump. Kept the old pump as a spare
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09-27-2011, 04:52 PM
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#6
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3 Rivet Member
1967 20' Globetrotter
denver
, Colorado
Join Date: Aug 2010
Posts: 153
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I thought it may be because its bolted to the plywood flooring but the Shur-Flo website says to mount the pump on a solid base to reduce noise.
I should remove the screws and let it rest on a soft base. That may help. The replies lead me to believe its a combo of where its mounted and the PEX plumbing.
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09-27-2011, 06:08 PM
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#7
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Rivet Master
1956 22' Safari
2015 27' Flying Cloud
Vintage Kin Owner
Conifer/Evergreen
, Colorado
Join Date: Feb 2002
Posts: 12,702
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We put an ShurFlo Accumulator Tank inline past the pump (under our dinette) and it seems to help reduce the rumble. You can see it here - post #378.
Shari
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09-27-2011, 06:16 PM
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#8
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Member Slide Out Society
2004 28' Safari S/O
Zavalla
, Texas Airstream Harbor
Join Date: Dec 2006
Posts: 77
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Shur-Flo makes a pump silencing kit...consists of two flexible hoses that you put on the input side and then the output side. takes most of the noise right out of the pump as the pluse direct to the Pex is absorbed in the flexible hoses. Worked on mine (2003 Safari) Took about 5 minutes to install, took about 75% of the bump noise out.
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09-27-2011, 06:28 PM
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#9
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Rivet Master
1971 25' Tradewind
1993 34' Excella
Currently Looking...
Estancia
, New Mexico
Join Date: Feb 2005
Posts: 7,743
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Quote:
Originally Posted by InsideOut
We put an ShurFlo Accumulator Tank inline past the pump (under our dinette) and it seems to help reduce the rumble.
Shari
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I don't think the accumulator pump will actually reduce the pump noise, but it will reduce the frequency the pump runs. It will run less often but run longer. It will also extend your pump life expectancy.
__________________
Sail on silver girl. Sail on by. Your time has come to shine.
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09-27-2011, 07:57 PM
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#10
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4 Rivet Member
2002 31' Classic
Ozark
, Missouri
Join Date: Jan 2004
Posts: 307
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Quote:
Originally Posted by Zia
I replaced my pump with variable speed pump which lowered the noise substantially. I paid $159 for the 4.5 gpm shurflow pump on-lin purchase. The pump was slightly taller, however, it fit in the original pump location. The electrical wiring is identical to the exisiting pump. Kept the old pump as a spare
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Star Kitty, I agree with Zia on the variable speed pump (Shurflow Extreme Series) It makes a big difference in noise & elimantes the harsh/abrubt on-off cycling. Short flexible lines help too, JB
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09-27-2011, 08:18 PM
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#11
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Rivet Master
Port Orchard
, Washington
Join Date: May 2009
Posts: 4,463
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Run all the faucets, including the outside one and the toilet, one by one until you are sure the air is out of every line. This is often the cause of noisy water systems.
When you travel carry enough water in the tank to be sure the pump can't draw air.
Ken
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09-27-2011, 09:01 PM
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#12
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Rivet Master
1965 17' Caravel
1983 27' Excella
Walnut Grove/Laguna Woods
, California
Join Date: Jun 2004
Posts: 1,635
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We have ShurFlo "Whisper King" pumps in both trailers. Each has a circular coil of flexible water hose on the inlet and outlet of the pump. Each pump is screwed directly to the floor.
Nearly no sound in either unit. Be sure that the coil of hose has nothing laying on it.
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09-27-2011, 09:04 PM
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#13
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Rivet Master
1991 34' Excella
1963 26' Overlander
1961 26' Overlander
Central
, Mississippi
Join Date: Nov 2006
Posts: 5,919
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There is an up-side to a noisy pump...it will awake you when a pipe leaks in the middle of the night...
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09-27-2011, 09:21 PM
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#14
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Rivet Master
1965 17' Caravel
1983 27' Excella
Walnut Grove/Laguna Woods
, California
Join Date: Jun 2004
Posts: 1,635
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Quote:
Originally Posted by HiHoAgRV
There is an up-side to a noisy pump...it will awake you when a pipe leaks in the middle of the night...
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This is a concern to us, especially on the Caravel.
We make sure the pump is off at night, and when we leave the trailers.
Hey, we are talking quiet here.
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09-27-2011, 09:25 PM
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#15
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Rivet Master
1991 34' Excella
1963 26' Overlander
1961 26' Overlander
Central
, Mississippi
Join Date: Nov 2006
Posts: 5,919
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Quote:
Originally Posted by Jim Foster
This is a concern to us, especially on the Caravel.
We make sure the pump is off at night, and when we leave the trailers.
Hey, we are talking quiet here.
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we spent several years on a boat...the sound of a running pump meant you were sinking...
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09-27-2011, 09:32 PM
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#16
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Rivet Master
1965 17' Caravel
1983 27' Excella
Walnut Grove/Laguna Woods
, California
Join Date: Jun 2004
Posts: 1,635
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Quote:
Originally Posted by HiHoAgRV
we spent several years on a boat...the sound of a running pump meant you were sinking...
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We had a houseboat on the Sacramento Delta for 25 years. I know exactly what you are talking about.
No noise is good noise.
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09-28-2011, 08:44 AM
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#17
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Rivet Master
1956 22' Safari
2015 27' Flying Cloud
Vintage Kin Owner
Conifer/Evergreen
, Colorado
Join Date: Feb 2002
Posts: 12,702
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Clarification...
Quote:
Originally Posted by Lumatic
I don't think the accumulator pump will actually reduce the pump noise, but it will reduce the frequency the pump runs. It will run less often but run longer. It will also extend your pump life expectancy.
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It helps eliminate "water hammer" noise...not the actual sound of the pump itself running.
Shari
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09-28-2011, 09:04 AM
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#18
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Rivet Master
1966 24' Tradewind
Placerville
, California
Join Date: Apr 2006
Posts: 3,328
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Quote:
Originally Posted by star kitty
I purchased and installed a low capacity (2.5 gpm) shur-flo pump this winter along with all new PEX water lines. The pump is resting directly on the floor with four screws right next to the water tank. The problem is, when I open a valve, it sounds like a train is running through my Airstream.
I am trying to figure out ways to dampen/solve the loud noise. I realize there is noise associated with a pump but I'm hoping to lower the sound a bit.
I usually don't add a lot of water into the tank because the demand is not there and I don't want the extra weight. Could some of the sound be caused by air in the lines because I am not carrying enough water? Could it be the rigid PEX pipe that runs along the street-side wall? Or is it because the pump is resting directly on the plywood flooring?
Thank you.
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Our Shurflo will become noisy when the tank water is TOO low. I too try to travel with minimum water level but with twin tanks that total almost 40 gals of water a low supply could be just under 1/4 tank.
Neil
__________________
Neil and Lynn Holman
FreshAir #12407
Avatar;
Kirk Creek, Big Sur, Ca. coast.
1966 Trade Wind
1971 Buick Centurion convertible
455 cid
1969 Oldsmobile Ninety Eight
455 cid
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09-28-2011, 09:15 AM
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#19
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3 Rivet Member
1972 27' Overlander
Saline
, Michigan
Join Date: Oct 2002
Posts: 189
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Quote:
Originally Posted by InsideOut
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I had noise problem with water hammer after swapping my original 1972 pump with a new surflo.
I also ended up installing a ShurFlow Accumulator Tank and in stopped the water hammer and pump cycles far less.
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09-28-2011, 10:20 AM
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#20
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Rivet Master
2005 30' Classic
Burlington
, Ontario
Join Date: Sep 2008
Posts: 2,743
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I recently installed a lower priced Shurflo pump and was very impressed with how little noise it made compared to the defective Aqua jet I took out.
Mind you, the Aquajet had rigid piping on the intake side and a length of flex hose on the outlet. When I put in the new pump I put a length of flex hose on both inlet and outlet.
The Surflow that I used had some sort of flexible mounting base to minimize sound transmission - I would have thought they would all have that, or rubber grommets or something. If not, you could improvise.
I can barely hear mine when it runs. The old one sounded as you describe - so maybe it was the hard piping on the inlet that caused the noise in my case.
I didn't change the old pump due to noise - it seized up.
Brian
__________________
Brian & Connie Mitchell
2005 Classic 30'
Hensley Arrow / Centramatics
2008 GMC Sierra SLT 2500HD,4x4,Crew Cab, Diesel, Leer cap.
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