Hot water by pass

Discussion in 'Winterizing' started by dvx216, Sep 27, 2017.

  1. Soulshine

    Soulshine Member

    58
    Sep 25, 2016
    Seneca Lake, NY
    '83 SRV 360 Express
    Twin Merc. 454
    I used a shop vac in reverse this year. Not a ton of pressure, but lots of volume.

    It worked great and I think I used 2 gallons of A/F to do the head, 3 sinks, the shower and the cockpit wash down using the on board pump.
     
  2. b_arrington

    b_arrington Member SILVER Sponsor

    380
    Feb 21, 2007
    Setauket, NY
    270 Amberjack (2006)
    AB Ventus 9 VL RIB
    350 Mag MPI Horizon w/ BIII
    1998 Envinrude 15 HP 2-stroke
    While the high air volume of the shop vac is good, I would NOT use it to blow out a potable water line. Think about all the dust and gunk in the shop vac tank and hose. If any of that got in the water lines it would set up a condition for a) bad taste, b) bad smell, and 3) growing nasties.

    Using the shop vac to suck could work. The challenge is adapting a 1/2" water fitting to a 3" vac hose. A standard compressor hose is already 1/2". I simply use an trigger-operated blow gun with a rubber end. I stuff that into the fitting and press the trigger. Of course that means you need to have access to a compressor. I've had 10 gallon rolling compressor for years that I've used for home projects so I just throw it in the back of the car to winterize the boat.
     
  3. b_arrington

    b_arrington Member SILVER Sponsor

    380
    Feb 21, 2007
    Setauket, NY
    270 Amberjack (2006)
    AB Ventus 9 VL RIB
    350 Mag MPI Horizon w/ BIII
    1998 Envinrude 15 HP 2-stroke
    IMO, it's totally worth it and the way to go. I used 1 gallon of pink this year. 1/3 went in the water tank just to ensure it was empty, 1/3 went down the toilet to ensure the waste line was covered, and 1/3 went in the shower sump. Everything else was blown out with air.

    After my cordless impact driver and slip-joint pliers, the compressor is probably my most oft-used tool.
     
  4. Jack380AC

    Jack380AC Member

    850
    Jan 28, 2008
    West Chester, PA / North East, MD
    2000 380 Aft Cabin
    Twin 454 Mag MPI Horizon MerCruiser
    Hmmm. Family has been asking me what I want for Christmas. This just might be the ticket.
     
  5. Soulshine

    Soulshine Member

    58
    Sep 25, 2016
    Seneca Lake, NY
    '83 SRV 360 Express
    Twin Merc. 454
    All good points. I don’t drink the water out of my system, but do treat it anyway for dish washing, showers, etc.

    The compressor doesn’t produce the purest air though either with the oil and condensate from the tank, which if not drained regularly might get a bit rank.
     
  6. alnav

    alnav Member GOLD Sponsor

    761
    Sep 16, 2009
    West River, MD
    40 MY
    QSB 425
    I don't have a need a powerful air compressor so I use one of these: http://www.blackanddecker.com/produ...ls/inflators/high-performance-inflator/asi300

    Available for less than $40, is oil-free and can operate on shore or battery power. It provides enough air to blow out my fresh water system. The rest of the year I keep it at home in case I need to inflate a tire or a ball for the grandkids. It also needs an adaptor for the shore water connection but those are readily available at Walmart or RV stores.
     
  7. importmonkey

    importmonkey Member SILVER Sponsor GOLD Sponsor

    483
    Jul 9, 2015
    Middle River, MD
    2007 44 Sundancer
    QSC 500s
  8. northern

    northern Active Member

    Jan 17, 2007
    West coast Vancouver to Alaska
    380 Aft Cabin 1989 GPS and Charts by Nobeltec
    Twin 454 strait shaft
    Compressor cost $100 that will do the work. New hot water tank cost $500.
     
  9. b_arrington

    b_arrington Member SILVER Sponsor

    380
    Feb 21, 2007
    Setauket, NY
    270 Amberjack (2006)
    AB Ventus 9 VL RIB
    350 Mag MPI Horizon w/ BIII
    1998 Envinrude 15 HP 2-stroke
    Not a bad gift at all.

    I have an older version of this one from Craftsman. Fits nicely under my workbench. I prefer an oil-lubricated compression for longevity. I had an oil-less pancake compression that literally burned out the oil-free piston sleeve. It was smoking. I didn't want to buy another compression so went with oil-lubed as a replacement.
     
  10. b_arrington

    b_arrington Member SILVER Sponsor

    380
    Feb 21, 2007
    Setauket, NY
    270 Amberjack (2006)
    AB Ventus 9 VL RIB
    350 Mag MPI Horizon w/ BIII
    1998 Envinrude 15 HP 2-stroke
    I have one of those pumps for my boat toys. It could work fine. It's high volume, low pressure which is actually ideal for blowing out water lines. You won't get the full rated volume when you add on the small adapter though; the rate volume is with no attachment.

    If you clean out and dry the sump box no pink is needed. I used pink because for my setup it's a pain in the neck to open up the cover for the sump. It's far more time efficient for me to pour some pink in the shower drain.
     
  11. b_arrington

    b_arrington Member SILVER Sponsor

    380
    Feb 21, 2007
    Setauket, NY
    270 Amberjack (2006)
    AB Ventus 9 VL RIB
    350 Mag MPI Horizon w/ BIII
    1998 Envinrude 15 HP 2-stroke
    Good point. I drain my tank fairly often. Still probably better than a shop vac, IMO.
     
  12. Jack380AC

    Jack380AC Member

    850
    Jan 28, 2008
    West Chester, PA / North East, MD
    2000 380 Aft Cabin
    Twin 454 Mag MPI Horizon MerCruiser
    Was looking at a Dewalt 6 gal 165 psi model for $139. Thoughts?
     
  13. Soulshine

    Soulshine Member

    58
    Sep 25, 2016
    Seneca Lake, NY
    '83 SRV 360 Express
    Twin Merc. 454
    I was thinking also that for me at least, the vacuum thing is followed by alcohol laden anti freeze, which might clean things up a bit.

    I don’t have a small compressor. If I did I’d probably use it for this.

    I did happen to have this odd ball fitting that fit into the vac hose and the plumbing perfectly.
     
    b_arrington likes this.
  14. JVM225

    JVM225 Well-Known Member

    Apr 8, 2008
    Farmingdale, NY
    2002 410 Sundancer, Monaco Edition.
    3126 Cats.
    I don’t think the shop vac would push enough pressure.
     
  15. Jack380AC

    Jack380AC Member

    850
    Jan 28, 2008
    West Chester, PA / North East, MD
    2000 380 Aft Cabin
    Twin 454 Mag MPI Horizon MerCruiser
    Seriously? You want to put a shop vac anywhere near your potable water? Yuk!
     
  16. Soulshine

    Soulshine Member

    58
    Sep 25, 2016
    Seneca Lake, NY
    '83 SRV 360 Express
    Twin Merc. 454
    The more I think about this and the more comments, the more I agree that the ratty old vacuum from the garage isn’t suitable for this.

    The vacuum I used for this is a very small one that I’ve only used up to this point to blow out my A/C lines. I haven’t done anything but blow air out of it.

    As I said, we don’t drink the water from the on board system and don’t know anyone who does now that I think of it.

    One thing I find strange about my boat is that it has no shore water inlet, a thing conspicuously missing in a larger boat with so much other junk on it.
     
  17. importmonkey

    importmonkey Member SILVER Sponsor GOLD Sponsor

    483
    Jul 9, 2015
    Middle River, MD
    2007 44 Sundancer
    QSC 500s
    But why not open all faucets and suck the water out through the supply? Sucking it out shouldn't contaminate the lines. Understand the blowing it out with one though.
     
  18. b_arrington

    b_arrington Member SILVER Sponsor

    380
    Feb 21, 2007
    Setauket, NY
    270 Amberjack (2006)
    AB Ventus 9 VL RIB
    350 Mag MPI Horizon w/ BIII
    1998 Envinrude 15 HP 2-stroke
    I try to keep my water system clean enough to drink from. I occasionally do, but I think I'm the only one on my boat to do so. We teh transom shower all summer to shower after swimming in salt water and I certainly don't want to shower with funky-smelling water.
     
  19. Jack380AC

    Jack380AC Member

    850
    Jan 28, 2008
    West Chester, PA / North East, MD
    2000 380 Aft Cabin
    Twin 454 Mag MPI Horizon MerCruiser
    Yep, even if you don't drink the water you may brush your teeth and wash dishes etc. I try to keep my water tank and lines clean and drinkable even if we prefer bottles for taste. One way is to continually use/refill the tank by never hooking up directly to shore water. This way water does not sit in the hose and bake in the sun and the water is turned over in the tank not allowing things to just sit in there and grow.
     

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