Yup. As someone who had a boat sink in it's slip because of a back-siphon "issue" (my fault....) I'm keenly aware of the importance of well maintained siphon loops.
Cheers, Dave 1982 C&C 37 - Ronin On Jul 11, 2013, at 8:27 PM, Martin DeYoung wrote: > >> I never really understood the loop in the discharge line.<< > > The vented loop is indeed to prevent a syphon from beginning. I have the > vented loops for all hoses that can access raw water in quantities that would > create a flooding. (head discharge and engine raw water especially) I have > also read of placing a syphon break in the raw water supply for the bowl but > do not have one on Calypso’s head. We shut off the head water supply when > not in use. > > I have not specifically studied whether a hose that only goes between the > head discharge and the top of a holding tank would require a vented loop (air > space of a partially full tank would also be a syphon break). I would > recommend having the hose routed to avoid standing black water in the hose > (run downhill to tank) as standing black water will cause odor to permeate > the hose. > > >> I've never actually done my business on a boat before… << > > Wow. Having made multiple 20 to 30 day offshore passages and cruised with > the family on board I have never considered the option of keeping the head > that pristine. I will discuss this with the 7 to 8 Calypso Crew that will be > onboard for a 100 mile race late August. Maybe there will be enough wind for > everyone to hold it start to finish. <VBG> > > When well offshore, especially in trade wind conditions (i.e. warm) I have > been known to use the “aft” head, the one with a great ocean view. Sitting > out in the open air with a roll of TP on a sail tie around my neck it was > mostly comfortable but one does worry about the errant flying fish. > > Martin > Calypso > 1971 C&C 43 > Seattle > > <image001.png> > > From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Stevan > Plavsa > Sent: Thursday, July 11, 2013 8:29 AM > To: cnc-list@cnc-list.com > Subject: Re: Stus-List Introduction and gastric reflux > > I never really understood the loop in the discharge line. If your discharge > line feeds the tank on top of the tank, in the middle, how would the contents > of the holding tank get back into the hose? I understand not everyone's setup > is this way ... and I'm only chiming in because I'm about to plumb mine the > way I described, I hope I'm not screwing something up. I don't like the idea > of a vented loop in my discharge, complicated .. and potentially gross. > > As to Peter's problem, my guess is the hose goes up before it goes down > again, so there are always contents in the hose. Your joker valve isn't > working well so the contents of the hose backwash into the bowl (IMO another > argument in favour of ditching the vented loop in the discharge). The fix > would be to fix/replace that joker valve and to make sure to pump the > contents well clear so that if there is any backwash it's .. cleaner. I've > never actually done my business on a boat before so I'm not the best person > to be giving this advice, much less redesigning and installing my own system > so if I'm off base I'de like to know! > > Steve > Suhana, C&C 32 > Toronto > > > > On Thu, Jul 11, 2013 at 8:27 AM, dwight veinot <dwightvei...@hfx.eastlink.ca> > wrote: > Probably caused by siphoning action…do you have a vented loop in the > discharge line? Like this one: > http://ca.binnacle.com/Plumbing-&-Pumps-Plumbing-Hardware/c31_264/p2249/FORESPAR-1-1/2&%2334-VENTED-LOOP/product_info.html > Dwight Veinot > C&C 35 MKII, Alianna > Head of St. Margaret's Bay, NS > _______________________________________________ > This List is provided by the C&C Photo Album > http://www.cncphotoalbum.com > CnC-List@cnc-list.com
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