Water pump surges? - Fiberglass RV


Reply
 
Thread Tools Search this Thread Display Modes
 
Old 08-31-2012, 01:36 PM   #1
Senior Member
 
SilverGhost's Avatar
 
Name: Jason
Trailer: Egg Camper
Tennessee
Posts: 322
Water pump surges?

I have been looking around, doing a lot of reading. Great stuff on here, I now have a couple page list of stuff I want to do

The few times we have boon docked and used the electric water pump it has pulsed badly. The pump cycles on and off about as fast as turn signals on a car flash. Makes me wish I could adjust the pressure switch a little, but I believe ours is a simple, sealed unit.

Now which would you do? I have a couple ideas on making the system deliver a smoother water flow;

1) Install a different water pressure switch. Either adjustable or just higher pressure to limit the amount of pump cycling.

2) Install a pressure bladder similar to the tanks used on homes with wells. Small tank absorbs the pressure and helps keep a more consistent pressure.

3) Combination of both?

Jason

PS; would a pressure limit valve that dumps back to the tank be viable?
__________________

__________________
SilverGhost is offline   Reply With Quote
Old 08-31-2012, 02:13 PM   #2
Member
 
Peter Steckhan's Avatar
 
Name: Peter
Trailer: 71 Boler
Saskatchewan
Posts: 39
Registry
Believe it or not, RV-specific accumulator tanks are available. They're smaller than what you would have for your house:

Water System Accessories - SHURflo

My pump with built in pressure switch pulses if I've got the faucet barely open, but it's smooth if the faucet is all the way open. I'm thinking of getting an accumulator tank so slower flows are smooth too.
__________________

__________________
Peter Steckhan is offline   Reply With Quote
Old 08-31-2012, 02:14 PM   #3
Senior Member
 
Name: Terry
Trailer: 1996 Casita Freedom Deluxe 17 ft
Colorado
Posts: 392
Jason, here are some possibilities:
1) My pump tends to cycle on and off like you describe if I open a faucet only a little bit but keeps running if I'm using more water. As far as I know, this is normal and not a problem.
2) The water pump can act strange if there's air in the lines. I've been able to fix this by opening all the faucets at the same time until water flows smoothly.
3) Could there be some sort of restriction in either the inflow or outflow of the pump?

Water pumps are fairly inexpensive but usually operate fine without the other gadgets you mention.
__________________
Terry G is offline   Reply With Quote
Old 08-31-2012, 02:29 PM   #4
Senior Member
 
Thomas G.'s Avatar
 
Name: Kinga DeRode
Trailer: For Sale Or Rent
Rooms to Let 50 Cents
Posts: 5,103
Plus 1 on the accumulator tank. I made my own from 1 1/2" PVC pipe capped on the end and mounted vertically. Not as neat as a bladder type, but cheap.
__________________
UHaul and Burro owners, join the UHaul Campers on Facebook. https://www.facebook.com/groups/529276933859491/
Thomas G. is offline   Reply With Quote
Old 08-31-2012, 05:27 PM   #5
Senior Member
 
peterh's Avatar
 
Name: Peter
Trailer: 2005 19 ft Scamp 19 ft 5th Wheel
Oregon
Posts: 1,519
Registry
Tom's solution is cheap and simple. The tricks to making it work that he didn't mention are:

* You need to have a capped vertical length of large-diameter (in Tom's case 1-1/2") PVC pipe with connected to a 1/2" "T" with transition connector-adapters. (Me? I'd use 6-10" of 2" diameter pipe.)
* The supply line needs to be horizontal.
* The air bubble at the top of your float will slowly get absorbed into your water supply over time. For this reason it's a good idea to occasionally -- like during your annual trailer clean-out -- completely drain your water supply system completely and air out. It can be handy to have a valve on the top of the float cap to make this easier to do.
__________________
peterh is offline   Reply With Quote
Old 08-31-2012, 06:13 PM   #6
Senior Member
 
Name: Ron
Trailer: 2008 13' Scamp
British Columbia
Posts: 325
Plus 3 on having a tank

I've used home made ones with good success. The best one I made was from an old s/s fire extingisher, the kind that you invert to use. It was also mounted higher than the faucet. It, in effect, became a "day tank" and once pumped up would provide water without the annoying rapid cycling of the waterpump for a long time.

I've also used a small, non-bladder tank and they also work well enough for me. My criteria is that I'd like to be able to rinse my hands etc. without the pump cycling on and off. Some people don't seem to mind it but it drives me nuts

Ron
__________________
Ron in BC is offline   Reply With Quote
Old 08-31-2012, 08:13 PM   #7
Moderator
 
Frederick L. Simson's Avatar
 
Name: Frederick
Trailer: Fiber Stream
California
Posts: 8,151
Registry
Send a message via AIM to Frederick L. Simson
Quote:
Originally Posted by Ron in BC View Post
Plus 3 on having a tank
+4 for the accumulator tank.

My biggest problem now is seepage from the "City Water" connector when we boondock using the fresh tank and pump. When I hear the pump cycle, I go out and check; usually finding a puddle under the fitting. The cap on it has to be snug as the valve never seems to seat properly. I've changed this fitting once, maybe it's time to do it again.
__________________
Frederick - The Scaleman
1978 Fiber Stream 16 named "Eggstasy" & 1971 Compact Jr. named "Boomerang"
Frederick L. Simson is offline   Reply With Quote
Old 09-01-2012, 06:29 AM   #8
Senior Member
 
SilverGhost's Avatar
 
Name: Jason
Trailer: Egg Camper
Tennessee
Posts: 322
Sounds like surge tank, it is. I have seen the ones at Home Depot that are for "hammering" - my house has a small one above the water heater in the garage. It is a small blue tank, about the size of a gallon of milk, and works like the bigger tank for the well. They also have the smaller copper "anti-hammer" pipes.

Mine is worse. Even with both hot and cold open full the pump cycles. I think this is the one time Jim's motto of overbuilding everything may have not been the best idea. A smaller pump or a higher pressure switch would have made an improvement.

Thanks for the great replies, now I just need to get around to it.

Jason
__________________
SilverGhost is offline   Reply With Quote
Old 09-01-2012, 08:28 AM   #9
Senior Member
 
Name: None
Trailer: None
None
Posts: 2,730
Pressure Switch

Well pressure switches have two settings . Range and Differential .Range is the top end pressure where the pump turns on (40-50-60 Lbs and differential is the difference between cut in and cut out pressure I.E 40-20 , 50-30 , 60- 40(20 lbs differential) Differential and a pressure tank helps prevent short cycling of the pump and overheating of the pump motor. Since trailer systems usually have no system to store water under pressure the differential portion of the pressure switch is basically useless. Tom is correct you need some form of pressure tank or accumulator to help control your cycling at low flow.
The 2 '' pipe Peter described is still used in my area but with city water to control water hammer . A 2" x 6 ft.Pipe is placed at the waters entrance to the bldg
__________________
steve dunham is offline   Reply With Quote
Old 09-01-2012, 10:46 AM   #10
Moderator
 
Frederick L. Simson's Avatar
 
Name: Frederick
Trailer: Fiber Stream
California
Posts: 8,151
Registry
Send a message via AIM to Frederick L. Simson
Quote:
Originally Posted by Frederick L. Simson View Post
+4 for the accumulator tank.
A picture of my pump and tank installation. shurflo-accumulator-tank
Attached Thumbnails
New.jpg  
__________________
Frederick - The Scaleman
1978 Fiber Stream 16 named "Eggstasy" & 1971 Compact Jr. named "Boomerang"
Frederick L. Simson is offline   Reply With Quote
Old 09-01-2012, 01:59 PM   #11
Senior Member
 
SilverGhost's Avatar
 
Name: Jason
Trailer: Egg Camper
Tennessee
Posts: 322
Quote:
Originally Posted by Frederick L. Simson View Post
A picture of my pump and tank installation. shurflo-accumulator-tank
Nice setup! I'll see what the price of the Home Depot tank is and how hard it would be to plumb up then check on the Shur Flo setup. Jim assembles the new Eggs with syn-flex hose and fittings, so I have to find a source for those.

Jason
__________________
SilverGhost is offline   Reply With Quote
Old 09-01-2012, 02:48 PM   #12
Senior Member
 
Carol H's Avatar
 
Name: Carol
Trailer: 22' Airstream Formerly 16' Scamp
British Columbia
Posts: 11,731
Registry
Frederick when you figure out which City Water Connection is the best one that doesnt leak on and off please post!! I am on my third one .. all have been different brand/style and I still have from time to time a leak from the fitting that cant be stopped no matter what. I did find though that buying a new hose helped more than replacing the fitting the last time though. Not sure if the threads on the hose wear down over time or what.
Carol H is offline   Reply With Quote
Old 07-11-2013, 10:08 PM   #13
Member
 
Trailer: 2011 KZ Sportsmen 242SB / 2004 Ram-Cummins 2500 2wd
Posts: 68
Have any of you looked this site RV Mods, RV Modifications, RV Upgrades, RV Tips, RV eBooks | ModMyRV.com ? There is a complete write-up (under plumbing) on how to home-build and plumb in an accumulator tank, and lots of other really interesting modifications. You'll see some my comments as Lloyd BC on that site.
__________________
Lloyd (aka Santa) Coltman is offline   Reply With Quote
Old 07-18-2013, 05:14 PM   #14
Member
 
Trailer: 2011 KZ Sportsmen 242SB / 2004 Ram-Cummins 2500 2wd
Posts: 68
Quote:
Originally Posted by Carol H View Post
Frederick when you figure out which City Water Connection is the best one that doesnt leak on and off please post!! I am on my third one .. all have been different brand/style and I still have from time to time a leak from the fitting that cant be stopped no matter what. I did find though that buying a new hose helped more than replacing the fitting the last time though. Not sure if the threads on the hose wear down over time or what.
Are you saying the internal check valve on the city water connection is leaking back? I've had trailers that were 30+ years old, and not had that problem, although our niece has had it with their unit (only 7 years old). Are you using a strainer screen equipped hose washer (Camco #20183), similar to what's used on an automatic washer? The only reason I can think of, for the valve to leak, is foreign material getting lodged in the valve, from a supply hose or hose bib. Our current unit (2011 Sportsmen) came equipped with this type of washer from the Mfr., don't know about others. As a matter of fact, I use one as an input strainer, at the input end of my suction hose (a 5' washing machine supply hose) when drawing water from the river to refill our fresh water tank when 'Boondocking'. That way, I avoid problems with the valves on my transfer pump (a second-hand Flojet 'Quiet Quad' that gets used by three or four of us, from time to time).
If washing machine valves need the protection, why wouldn't your city water connection?
BTW, our water pressure regulator also came equipped with a screen/hose washer, and I wouldn't use any other type.
__________________

__________________
Lloyd (aka Santa) Coltman is offline   Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
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 Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Water Pump Diane H Problem Solving | Owners Helping Owners 10 07-19-2013 08:09 PM
water pump, conundrum... GordM Care and Feeding of Molded Fiberglass Trailers 33 08-03-2010 06:00 PM
Adding water pump Jeff Peterson Plumbing | Systems and Fixtures 7 10-08-2009 08:11 PM
Where to mount Water Pump? efawcett Plumbing | Systems and Fixtures 9 07-13-2007 06:10 PM
water pump problem Jamey Plumbing | Systems and Fixtures 11 03-07-2007 11:32 PM

» Upcoming Events
No events scheduled in
the next 465 days.
» Virginia Campgrounds

Reviews provided by


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 09:22 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.