Fresh Water Accumalator

Discussion in 'Sport Yachts/Yachts' started by bbwhitejr, Nov 10, 2018.

  1. bbwhitejr

    bbwhitejr Well-Known Member SILVER Sponsor

    Apr 14, 2013
    Lake Lanier GA
    2007 44DB
    Cummins QSC 8.3s
    Does anyone know if the 420/44 DBs came with an accumulator on the fresh water system? I have never found one. PO had changed the FW pump and it always worked perfect. It got to where it would not come on so I changed the pressure switch and still had to hit it for it to pump.

    I installed a new Jabsco 6.0gpm yesterday and with one faucet open it pulsates like crazy. When I open 1, 2, 3, or even 4 faucets, it runs perfect and flow and pressure are great!

    Will an accumulator solve this issue? Why do some boats have them and some do not?

    Bennett
     
  2. hottoddie

    hottoddie Well-Known Member

    Jan 11, 2012
    Boston/Cape Cod
    1986 Sea Ray 390 EC
    Garmin 4212 Chartplotter
    Garmin 24 HD Radar
    Garmin 546s Plotter
    454 Crusaders
    It should solve the problem. If you do have one the diaphragm may have ruptured and it no long acts as a "shock absorber" in the water system. I would expect it to be located somewhere near the fresh water pump and is connected to a "tee" in the fresh water outlet side of the pump. They come in different sizes but I would choose one that would have about a gallon capacity for your needs.
     
  3. MonacoMike

    MonacoMike Well-Known Member PLATINUM Sponsor

    Sep 15, 2009
    Indiana lakes and Lake Michigan
    2000 Cruisers 3870
    8.2 Mercs
    85 Sea Ray Monaco 197
    260hp Alpha 1
    Following.

    Decided to post my own question and not hijack here.

    MM
     
  4. bbwhitejr

    bbwhitejr Well-Known Member SILVER Sponsor

    Apr 14, 2013
    Lake Lanier GA
    2007 44DB
    Cummins QSC 8.3s
    I have purchased a 2gal tank with the “T” fittings and connections. How close to the pump does it have to be? Some say anywhere in a cold water line.

    Bennett
     
  5. hottoddie

    hottoddie Well-Known Member

    Jan 11, 2012
    Boston/Cape Cod
    1986 Sea Ray 390 EC
    Garmin 4212 Chartplotter
    Garmin 24 HD Radar
    Garmin 546s Plotter
    454 Crusaders
    Anywhere is fine. Try to put it in an accessible spot so you can check the air pressure once or twice a year.
     
  6. stephenm27

    stephenm27 Member

    248
    Nov 3, 2009
    Milton, GA
    2009 310 Sundancer
    350 MAG Mercs/B3 x 2 (Axius Premier)
    Anywhere will work...I put mine under the head sink while the pump is in the ER. Ease of installation and serviceability trumps proximity to the pump...
     
  7. Blueone

    Blueone Well-Known Member SILVER Sponsor

    Jan 24, 2007
    Lake Erie, Ohio
    2004 420 Sundancer
    Cummins 6CTA 450's
    What made you decide to go so big?...2 gl seems like alot. Mine is maybe a quart
     
  8. bbwhitejr

    bbwhitejr Well-Known Member SILVER Sponsor

    Apr 14, 2013
    Lake Lanier GA
    2007 44DB
    Cummins QSC 8.3s
    hottoddie suggested 1 gal and I talked to Jabsco and they recommended 2gal set at 42psi. For once something can be placed for easy access????????

    Bennett
     
    Blueone likes this.
  9. MonacoMike

    MonacoMike Well-Known Member PLATINUM Sponsor

    Sep 15, 2009
    Indiana lakes and Lake Michigan
    2000 Cruisers 3870
    8.2 Mercs
    85 Sea Ray Monaco 197
    260hp Alpha 1
    Go big or go home... I too am surprised at a two gallon.

    MM
     
  10. stephenm27

    stephenm27 Member

    248
    Nov 3, 2009
    Milton, GA
    2009 310 Sundancer
    350 MAG Mercs/B3 x 2 (Axius Premier)
    I have the same (quart-sized) one...I couldn’t afford to give up the storage space for the larger one.
     
  11. hottoddie

    hottoddie Well-Known Member

    Jan 11, 2012
    Boston/Cape Cod
    1986 Sea Ray 390 EC
    Garmin 4212 Chartplotter
    Garmin 24 HD Radar
    Garmin 546s Plotter
    454 Crusaders
    The bigger the accumulator the less often the pump will cycle on and the smoother the water flow out the faucets. They can most times keep the pump(s) from cycling all night,
     
  12. Sublimetime

    Sublimetime Active Member

    576
    Oct 22, 2007
    clifton nj
    420 da
    454
    quote [I have the same (quart-sized) one...I couldn’t afford to give up the storage space for the larger one.[/QUOTE]

    It doesn't have to be by he pump, it will work anywhere on the cold water supply as long as it is before the tee to the water heater.
     
  13. carterchapman

    carterchapman Well-Known Member TECHNICAL Contributor SILVER Sponsor

    Mar 25, 2008
    Lake Chickamauga/Marietta, GA/Ft. Myers, FL
    2006 Sea Ray 58 DB
    MAN CRM V8-900s, Twin Disc Drives; Onan 21.5 Generator
    Bennett - I don't have one, but don't really have pressure fluctuations. As far as I know they didn't put them on the 58's...
     
  14. bbwhitejr

    bbwhitejr Well-Known Member SILVER Sponsor

    Apr 14, 2013
    Lake Lanier GA
    2007 44DB
    Cummins QSC 8.3s
    Thanks Carter. I do not understand why some have and some not...The FW pump had been replaced by the PO and this boat did not have one nor need one. The pump started acting up, needing to be tapped on to get it to run. I changed the pressure switch and same issue. I know I cut it on while connected to shore water several times and not sure what that did to it, but nonetheless, I changed it out going from a 5.3gpm up to a 6.0. Open one faucet and it pulsates like hell. Open a 2nd, 3rd, or 4th faucet and tons of water pressure and no pulsating...Tomorrow is the install....

    Bennett
     
  15. carterchapman

    carterchapman Well-Known Member TECHNICAL Contributor SILVER Sponsor

    Mar 25, 2008
    Lake Chickamauga/Marietta, GA/Ft. Myers, FL
    2006 Sea Ray 58 DB
    MAN CRM V8-900s, Twin Disc Drives; Onan 21.5 Generator
    Bennett, I don't know why either. I'm sure I can look forward to that problem, so appreciate your fix details...
     
  16. bbwhitejr

    bbwhitejr Well-Known Member SILVER Sponsor

    Apr 14, 2013
    Lake Lanier GA
    2007 44DB
    Cummins QSC 8.3s
    Ok...this did not happen today. I had a some kind of a water leak that had developed a week or so ago. While looking to see where to put this accumulator, I noticed my leak had increased. I started hunting and found it in the bilge behind the gen along the edge of the swim platform. I had been replacing all female connectors last winter, but found three of them connected to a “T”. One for more was dripping so I just replaced all three. Due to access, this took longer than I wanted it to.

    As far as locating the accumulator, I have one spot picked out on the starboard side of the bilge and the only other spot is under the galley sink. I like under the sink best. It will be a matter of removing the cabinet door and wedging in sideways with my shoulders...the blue/red hose they plumbed these boats with is awful to work with. I may wind up using some PEX and PEX connectors to hook up this thing. I hope it get back on it in a couple of weeks.

    Bennett
     
  17. Russ Calasant

    Russ Calasant Active Member

    Dec 9, 2009
    East Greenwich, RI
    2001 480 DB
    CAT 3196
    I’ve realized now that I am having a problem with the accumulator - thanks! I had upgraded and replaced both pumps, water pressure was great and then seemed to diminish. The pump cycles on / off constantly unless you increase demand by turning on another faucet. After reading this thread I decided to go check out the accumulator, I couldn’t get a pressure reading so I screwed on the portable pump end and proceeded to get wet, I assume the bladder has ruptured. This does not surprise me, I replaced two in my 460. So I am looking at replacements and notice two manufacturers primarily, Groco and Jabsco - the latter being the OEM (33 oz). Now bigger sounds better to me but if you look the specs are all over the place. The 2 gallon Jabsco is also listed as 1 gallon cap on some websites and curiously is the same physical size as the Groco PS1 which is 1 gallon but lists .4 gal capacity? How can that be? There is a $50 difference, not a big deal but trying to wrap my head around it.
     
  18. stephenm27

    stephenm27 Member

    248
    Nov 3, 2009
    Milton, GA
    2009 310 Sundancer
    350 MAG Mercs/B3 x 2 (Axius Premier)
    Some may be quoting overall volume vs water capacity---due to the air bladder, roughly half of the internal cubic space is consumed by air.
     
  19. Russ Calasant

    Russ Calasant Active Member

    Dec 9, 2009
    East Greenwich, RI
    2001 480 DB
    CAT 3196
    Yes, that appears to be the idea, air pressure and water pressure are the variables - seems like 20psi for the air (bladder) and water (pump) 40psi is the unwritten standard - question is not everyone lists the numbers used for capacity draw down volume. So it appears that the Groco PS1 is roughly the equivalent to the Jabsco 18810 in volume. I found the Groco PS2, 4 gal w 1.4 gal drawdown @$150 is the best option for me.

    Bennett, I am curious to know how you make out and your findings. FYI in my search I found recommendations to go 3/4” pipe if you are not installing close to pumps, if you are considering the under sink install - not sure how it would matter unless you were going all the way back to pump with it, but worth considering a closer location.
     
  20. bbwhitejr

    bbwhitejr Well-Known Member SILVER Sponsor

    Apr 14, 2013
    Lake Lanier GA
    2007 44DB
    Cummins QSC 8.3s
    Here goes the one I bought. I am going to stay with the 1/2" pipe and fittings. Unit looks very nice and sturdy. I have finally figured out I am going to install under the galley sink. I finally have all of my fittings and will install the weekend of 12/1.

    upload_2018-11-20_13-47-11.png
     

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