[C38] Vented loop for head discharge

[Steve Smolinske]

Right, I know the loop breaks the siphon, the question is has anyone had
a problem with the black water that is always present from the head to
the loop ever leaking back past the duckbill and flapper valves and
filling the head, similar to how the bowl fills if you don't have a loop
and leave the seacock open.,   Thanks

 

From: listserve-bounces at catalina38.org
[mailto:listserve-bounces at catalina38.org] On Behalf Of Max Soto
Sent: Tuesday, November 01, 2011 7:44 AM
To: Catalina 38 Listserve
Subject: Re: [C38] Vented loop for head discharge

 

Steve,  Since the loop+vent breaks the siphon, the "pressure" on the
joker valve is from the grey water located between the head and the
loop.

Don, same thing happened to the PO, so he made a box that raises the
head about 7 inches, and added a vented loop to the intake hose.
Apparently he found he boat with 1' of water. I think that the vented
loop for the intake  is enough, so I'm going to remove the riser box.
Short people have their feet on the air while seating in the head! 

 

Regards,

 

Max

2011/11/1 Don Strong <drstrong at ucdavis.edu>

Steve: I did the vented loop head-to sea retrofit because my insurer
demanded it.  Big job! The exit hose goes up the along the hull, through
the sink top and reaches an apex are just under the deck. The vent is at
the apex. The loop+vent breaks the siphon. I don't see how the grey
water problem is any different between "overboard" and "waste tank."
When the valve is thrown to tank, grey water sits behind the joker valve
just as it does when the valve is thrown to overboard. 

I also installed a vented loop for the sea water intake for the head
after we awoke with 6" of water in the boat (someone "moi?" was too
sleepy to flip the switch to "dry bowl during the night).  There is also
a vented loop on the sea water intake for engine cooling. I recently
replaced the vent.
Don



On 10/31/11 11:43 PM, Steve Smolinske wrote: 

	Question for anyone with a vented loop in their head discharge.
Looking at it on paper it seems that the pressure of the grey water in
the section from the head to the vented loop would be enough to leak
back into the toilet bowl.  I know there is a duckbill valve and a
flapper valve in the head to stop the reverse flow, but as we all know
if you leave the discharge seacock open the head will fill up.   Does
the vented loop work because the head pressure of the grey water in the
run from head to loop is not as great as that coming from the seacock?
Any experiences are greatly appreciated.   Thanks

	 

	Steve

	 

	_______________________________________________
	Listserve mailing list
	Listserve at catalina38.org
	http://catalina38.org/mailman/listinfo/listserve_catalina38.org





-- 
Donald R. Strong
Professor
Dept. of Evolution and Ecology
University of California, Davis 95616


_______________________________________________
Listserve mailing list
Listserve at catalina38.org
http://catalina38.org/mailman/listinfo/listserve_catalina38.org





 

-- 
Max Soto
C38 #198 ESTANCIA
Puntarenas, Costa Rica

________________________________

No virus found in this message.
Checked by AVG - www.avg.com
Version: 10.0.1411 / Virus Database: 2092/3988 - Release Date: 10/31/11

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://catalina38.org/pipermail/listserve_catalina38.org/attachments/20111101/85d1e20b/attachment-0001.htm>