Installing a new SureFlo water pump...
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07-02-2008, 12:17
Post: #11
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Installing a new SureFlo water pump...
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07-02-2008, 12:27
Post: #12
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Installing a new SureFlo water pump...
It's actually an "accumulator tank" that accumulates pressure for the water system. It's often located near the main water pump. It will look like a canister of about 6 to 8" in diameter and perhaps 12 to 14" tall. Mine was painted blue. There will be a schrader valve on one end. This allows you to pressurize the diaphragm, if it loses it's 'charge.' Normally you'd fill it with air to about the expected water pressure in the system, that puts the rubber diaphragm at the minimum stretch. As pressure drops, the diaphragm pushes on the water side of the accumulator tank (giving you water pressure). As water pressure is recovered by the pump, it will push the diaphragm back against the trapped air.
Almost all water pump systems (home or RV) have them (sized for the water demand). The usual maintenance issue is that the air pressure has been lost (just put a compressor on it and pump it back up) or the diaphragm has failed (in which case the accumulator tank must be replaced). Pete Masterson '95 Blue Bird Wanderlodge WBDA 42 El Sobrante CA "aeonix1@mac.com" On Jul 2, 2008, at 4:37 PM, Scott Forman wrote:
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07-02-2008, 12:36
Post: #13
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Installing a new SureFlo water pump...
Is it marked on the accumulator how much air pressure one is supposed
to put into the unit? Al Johnson '96 BMC B100 Mandeville, Louisiana --- In WanderlodgeForum@yahoogroups.com, Pete Masterson wrote: > > It's actually an "accumulator tank" that accumulates pressure for the > water system. It's often located near the main water pump. It will > look like a canister of about 6 to 8" in diameter and perhaps 12 to > 14" tall. Mine was painted blue. There will be a schrader valve on > one end. This allows you to pressurize the diaphragm, if it loses > it's 'charge.' Normally you'd fill it with air to about the expected > water pressure in the system, that puts the rubber diaphragm at the > minimum stretch. As pressure drops, the diaphragm pushes on the water > side of the accumulator tank (giving you water pressure). As water > pressure is recovered by the pump, it will push the diaphragm back > against the trapped air. > > Almost all water pump systems (home or RV) have them (sized for the > water demand). The usual maintenance issue is that the air pressure > has been lost (just put a compressor on it and pump it back up) or > the diaphragm has failed (in which case the accumulator tank must be > replaced). > > Pete Masterson > '95 Blue Bird Wanderlodge WBDA 42 > El Sobrante CA > aeonix1@... > > > > On Jul 2, 2008, at 4:37 PM, Scott Forman wrote: > > > Where is the pressure tank? > > > > Scott Forman > > 86 PT38 > > Memphis > > > > --- In WanderlodgeForum@yahoogroups.com, "Ryan Wright" > > > >> > >> Thank you for the responses. I ordered the 5.7 from pplmotorhomes, > >> and > >> the screen/filter for it. Look forward to installing this. I'm going > >> to go through and tighten any hose clamps I can find before > >> installation, just to be safe. > >> > >> I do think I'll keep the pressure tank. I usually keep the pump off, > >> only turning it on when necessary. The pressure tank allows me to > >> wash > >> my hands and flush the toilet a couple of times without turning the > >> pump on, which is nice, especially in the middle of the night. > >> > >> Appreciate the replies! > >> > >> -Ryan > >> '86 PT-40 8V92 > >> > > > > > > > > ------------------------------------ > > > > Yahoo! Groups Links > > > > > > > |
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07-02-2008, 13:46
Post: #14
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Installing a new SureFlo water pump...
On Wed, Jul 2, 2008 at 5:27 PM, Pete Masterson
> It's actually an "accumulator tank" that accumulates pressure What's the difference? I've always heard it called a "pressure tank" ... we use them on wells, in water filtration systems, etc. Not that the name matters. ![]() for the same products. Scott, mine is under the driver's side bed, toward the front of the coach. -Ryan |
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07-02-2008, 13:54
Post: #15
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Installing a new SureFlo water pump...
Kevin,
Thanks for the info. I'm looking forward to receiving this new pump. Mine is the old belt driven style... and I do mean old; my '66 Travco had the same darn pump and based on the looks of it, I'm guessing that's what it came with. Pretty sure my Bird came with the same pump way back in '86. I always leave my water pump off unless I'm washing dishes or taking a shower. Beyond that, I only turn it on for a few seconds to recharge the pressure/accumulator tank when water flow slows down. I do this for precisely the reason you mentioned... A couple of years ago, before I bought my coach, I read a post (I think it was on this forum even) about someone who came back to a flooded coach and a smoking, almost but not quite on fire water pump that had been running dry for God knows how long. I'd rather not deal with any of that and it's easy enough to flip the water on and off as I need it. ![]() -Ryan '86 PT-40 8V92 On Wed, Jul 2, 2008 at 6:44 PM, > Ryan, > > I installed the shurflo a few years ago, after my accumulator tank failed. > I eliminated the tank, and went with just the pump. Works great. The pump > speeds up when the demand increases, and it is sure nice using the shower > with the improved pressure. You use more water just because it comes out > faster, but according to my girls, it's a lot easier to get the shampoo out > of their hair so it probably about the same water usage. All the tank does > is maintain some pressure in the lines so the pump doesn't run for just a > momentary demand of water. Since the shurflo is a variable speed motor, you > won't notice a difference in sound from the original (maybe even a little > quieter) > > Just one note....I had a fitting pop off the pressure side of the pump while > I was driving, and in a short period of time that ever so efficient pump > almost drained my fresh water tank into the area where the pump and > accumulator tank is located. It was a faulty shurflo clamp....(taught me to > keep the pump switch "Off") > > Kevin McKeown > Yorba Linda, CA > 1986 38' PT (For sale) > > > ________________________________ > Gas prices getting you down? Search AOL Autos for fuel-efficient used cars. > |
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07-02-2008, 14:43
Post: #16
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Installing a new SureFlo water pump...
--- In WanderlodgeForum@yahoogroups.com, "Ryan Wright"
Does this look like your pump? If so it is used in a million boats and in our Wanderlodge coach. It can run for days without water and not get hot. I just wanted to defend it so it does not get a bad name. http://www.wmjmarine.com/itt-369001000.html It has been around for years, long before computers. Still pumping. Leroy Eckert 1990 WB-40 Smoke N Mirrors Dahlonega, GA > > Kevin, > > Thanks for the info. I'm looking forward to receiving this new pump. > Mine is the old belt driven style... and I do mean old; my '66 Travco > had the same darn pump and based on the looks of it, I'm guessing > that's what it came with. Pretty sure my Bird came with the same pump > way back in '86. > > I always leave my water pump off unless I'm washing dishes or taking a > shower. Beyond that, I only turn it on for a few seconds to recharge > the pressure/accumulator tank when water flow slows down. I do this > for precisely the reason you mentioned... A couple of years ago, > before I bought my coach, I read a post (I think it was on this forum > even) about someone who came back to a flooded coach and a smoking, > almost but not quite on fire water pump that had been running dry for > God knows how long. I'd rather not deal with any of that and it's easy > enough to flip the water on and off as I need it. ![]() > > -Ryan > '86 PT-40 8V92 > > On Wed, Jul 2, 2008 at 6:44 PM, > > Ryan, > > > > I installed the shurflo a few years ago, after my accumulator tank failed. > > I eliminated the tank, and went with just the pump. Works great. The pump > > speeds up when the demand increases, and it is sure nice using the shower > > with the improved pressure. You use more water just because it comes out > > faster, but according to my girls, it's a lot easier to get the shampoo out > > of their hair so it probably about the same water usage. All the tank does > > is maintain some pressure in the lines so the pump doesn't run for just a > > momentary demand of water. Since the shurflo is a variable speed motor, you > > won't notice a difference in sound from the original (maybe even a little > > quieter) > > > > Just one note....I had a fitting pop off the pressure side of the pump while > > I was driving, and in a short period of time that ever so efficient pump > > almost drained my fresh water tank into the area where the pump and > > accumulator tank is located. It was a faulty shurflo clamp....(taught me to > > keep the pump switch "Off") > > > > Kevin McKeown > > Yorba Linda, CA > > 1986 38' PT (For sale) > > > > > > ________________________________ > > Gas prices getting you down? Search AOL Autos for fuel-efficient used cars. > > > |
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07-02-2008, 14:46
Post: #17
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Installing a new SureFlo water pump...
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07-02-2008, 15:53
Post: #18
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Installing a new SureFlo water pump...
Ryan, A call to Shurflo might be worth it regarding its use with the pressure tank. The installation instructions are pretty clear in that there shouldn't be any elbows, or other obstructions, within x distance from the pump outlet. These kinds of obstructions can reflect the water pressure tricking the pump into thinking that the water line is pressurized (when it's actually only the pressure in the pressurized tank). You may end up with pressure oscillations if you keep the pressure tank. Give it a try. If you have oscillations, then remove the pressure tank. David Brady '02 LXi, NC Ryan Wright wrote:
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07-02-2008, 16:46
Post: #19
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Installing a new SureFlo water pump...
One thing about pump ratings is the psi at a given gpm discharge.
shureflow seems to maintain sufficient psi at normal use. I fill the fresh water tank and use the pump to pressurize the bus often while camped with full hookups. Not hearing the pump run when all is quiet indicates no leaks. My 94 has two ShureFlow pumps I have the option of running both but can only guess that that is to maintain a steady psi with higher volumn flow. ( Like Ernie points out that is asking for a quick depletion) I use one or the other to exersize both pumps independently(choice is an "A-B-Both switch in the bathroom). One thing to point out in this thread XXXXXXXXXXXXXXXXXXXXX The pumps have a built in backflow / checkvalve. that is; you can not push water in the discharge side even with the pump off. if the backflow craps out, pressurizing with city p.o.c. will send water past the pump and overflow the Potable tank. If you remove a pump for repair it is best to plug both lines (atleast the discharge) and not loop them with a pipe splice. GregoryO'Connor 94ptRomolandCa |
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07-03-2008, 03:53
Post: #20
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Installing a new SureFlo water pump...
No. It is apparently assumed that you'll know what to do. (These are mostly installed by professional plumbers.) The only instructions I found in a brief online search stated: The accumulator tank is precharged at 0.8 bar. If your pump's cut-in pressure is different you may have to customize the tank to best fit your installation. It goes on to explain how to check and adjust the pressure in the tank. See:
I note that this appears to be from a Swedish company and English is not the primary language. I leave it to you to figure out what 0.8 bar is in psi. English instructions are on page 4 of this pdf.
Pete Masterson '95 Blue Bird Wanderlodge WBDA 42 El Sobrante CA "aeonix1@mac.com" On Jul 2, 2008, at 5:36 PM, Al wrote:
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