Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 18-10-2007, 06:25   #16
Moderator Emeritus
 
GordMay's Avatar

Join Date: Mar 2003
Location: Thunder Bay, Ontario - 48-29N x 89-20W
Boat: (Cruiser Living On Dirt)
Posts: 31,580
Images: 240
Dometicís (SeaLand) new (Italian made)? OdorSafe Plus hose is claimed to deliver 20% more resistance to odor permeation compared to the previous OdorSafe brand hose.
http://www.vacustat.com/pdf/OdorSafe%20Plus%20NR.pdf
Hose / Fittings
http://www.cruisersforum.com/forums/...-bay-4515.html
__________________

__________________
Gord May
"If you didn't have the time or money to do it right in the first place, when will you get the time/$ to fix it?"



GordMay is offline   Reply With Quote
Old 18-10-2007, 10:21   #17
Registered User
 
Triton318's Avatar

Join Date: Aug 2006
Location: Hayes, Virginia
Boat: 1962 28' Pearson Triton
Posts: 289
Quote:
Originally Posted by drh1965 View Post
Both vented loops will be mounted on the bulkhead above the head.
Seven years ago, when rebuilding my Triton, I installed a Blake Lavac marine toilet with an intake hose and a hose that goes from the toilet to the diaphragm pump and then to the discharge through-hull/seacock. I never installed vented loop fittings for either the intake or discharge side (partly because its function seemed to elude me and partly because the fittings were so expensive). Each hose does, however, have a loop that is situated above the waterline. Still...I often wonder if something catastrophic is going to happen because I don't have the vented loop fittings. To date, I've never had a problem with water coming in when it shouldn't. (Also, I always close both seacocks when I leave the boat.)
__________________

__________________
Jay White
S/V Dove
1962 Pearson Triton, #318
Triton318 is offline   Reply With Quote
Old 18-10-2007, 11:05   #18
Senior Cruiser
 
rebel heart's Avatar

Cruisers Forum Supporter

Join Date: Oct 2005
Posts: 6,190
Images: 3
Quote:
Originally Posted by Triton318 View Post
Seven years ago, when rebuilding my Triton, I installed a Blake Lavac marine toilet with an intake hose and a hose that goes from the toilet to the diaphragm pump and then to the discharge through-hull/seacock. I never installed vented loop fittings for either the intake or discharge side (partly because its function seemed to elude me and partly because the fittings were so expensive). Each hose does, however, have a loop that is situated above the waterline. Still...I often wonder if something catastrophic is going to happen because I don't have the vented loop fittings. To date, I've never had a problem with water coming in when it shouldn't. (Also, I always close both seacocks when I leave the boat.)
I did the same thing a few months ago: Lavac went in, and no vented loop if you're discharging overboard. I'm going to go back through and clear that out however. It hasn't caused me any problems either, but then again I haven't needed to use my seat belt yet either.
__________________
rebel heart is offline   Reply With Quote
Old 18-10-2007, 12:50   #19
Registered User

Join Date: Jun 2006
Posts: 237
You guys are playing with fire. On my boat, the PO's broker broke the joker valve in the "wet" Flush setting. He then left the scene. I came to check on the boat and found that the toilet had syphoned water out of the sea until the bowl was filled to the top and it was continously dripping around the seat. Had I not checked on the boat, the bilge pump might have flattened the batteries (glub glub glub goes the boat). Had the top of the head been below the water line, the boat would have likely sunk pretty fast.

If a vented loop had been installed well above the heeled water line, the syhon action would have been broken (assuming the vented loop was clean and functioning properly) even though the head was broken. The same exact principal applies to the output side of the head. You can end up with holding tank or sea water syphoning back through the head.
__________________
drh1965 is offline   Reply With Quote
Old 18-10-2007, 14:11   #20
Senior Cruiser

Cruisers Forum Supporter

Join Date: Dec 2006
Location: Seattle
Boat: Cal 40
Posts: 2,401
Images: 7
Quote:
Originally Posted by Triton318 View Post
Seven years ago, when rebuilding my Triton, I installed a Blake Lavac marine toilet with an intake hose and a hose that goes from the toilet to the diaphragm pump and then to the discharge through-hull/seacock. I never installed vented loop fittings for either the intake or discharge side (partly because its function seemed to elude me and partly because the fittings were so expensive). Each hose does, however, have a loop that is situated above the waterline. Still...I often wonder if something catastrophic is going to happen because I don't have the vented loop fittings. To date, I've never had a problem with water coming in when it shouldn't. (Also, I always close both seacocks when I leave the boat.)
It only matters if the top of your head is below the waterline at any time, any heel angle.

Loop a hose from a seacock to above the waterline and back down below the waterline in your boat. If you started with air in the hose when you open the seacock, nothing happens. If you suck on it so water is in the entire hose, now water will come into your boat. (Sorry if you were real clear on what a siphon was.) Now plug the end of that hose into your head that has had a few years of service such that the valves in it don't seal 100% and the water will continue to come in if the top of the bowl is below the waterline. If the top of your bowl is above the waterline, water will come in until it is level with the water outside the boat. Actually you have no valves on the intake side of your Lavac, so either your head is above the waterline, or you have an air leak in the intake hose that you aren't aware of. Are you sure you didn't install the air bleed valve that comes with the head? The air bleed valve is an anti-siphon break. Any sort of hole in the hose near the top of the loop will allow air into the hose breaking the siphon. A more complicated siphon break has a one way valve that when the water in the hose is under pressure the valve closes to prevent contents of the hose from coming out. When the contents are trying to siphon into the boat the pressure in the hose at the top of the loop is less than surrounding, the valve will open allowing air in and breaking the siphon.

http://www.blakes-lavac-taylors.co.uk/pdf/lavac.pdf

If you do have the air bleed in the intake hose, and therefore there is a possibility that your head is below the waterline, and the check valves in your diaphragm pump leak and you somehow leave the outlet hose full of water, then you will benefit from an anti-siphon valve in your outlet hose.

Many years ago on a trip from Hawaii to Seattle, the boat I was crewing on had a Lavac head. On the tack that put the head on the high side of the boat, normal pumping action did not produce enough vacuum to lift the water to the top of the loop. The air bleed let air in too fast. We resorted to bringing pots of water from the galley to pour into the head. One day I planted my feet in the corners of the room, my back against the bulkhead and pumped as fast as I could. Once I got the water around the corner (over the top of the loop), I got water to flow into the head.

John
__________________
cal40john is offline   Reply With Quote
Old 01-04-2012, 14:41   #21
Registered User
 
LifesAnAdventure's Avatar

Join Date: Oct 2010
Location: City Island, NY
Boat: Pearson 38'-Life's An Adventure
Posts: 16
Re: Best wastewater hose to use

As a general contractor of 25 years and a sailor for 40 years I would lean towards using tubing over pvc of any wall size. I am actually in the process of changing my head and hoses to my holding tank. I thought the odor was solely from the hoses but when I removed the holding tank from it's holding area I found that someone previous to me owning the boat had drilled a hole into the tank and I had odors as well as liquid and solids spewing into my bilge. I was pretty upset when I found this but thinkful I did. A hardware store owner on the island I keep my boat suggested using some silicone and a stainless steel screw to plug the hole in the poly tank. I did this just the other day and when I go back to the boat Wednesday I'll see how it looks. I will be placing my order for Trident Sani Shield Sanitation Hose #102. The best price I found was at Defender.

Has anyone found a better price any place other than Defender?
__________________
LifesAnAdventure is offline   Reply With Quote
Old 01-04-2012, 15:26   #22
Registered User
 
janice142's Avatar

Join Date: May 2006
Location: west coast of Florida
Boat: Schucker mini-trawler
Posts: 331
Send a message via AIM to janice142 Send a message via MSN to janice142 Send a message via Yahoo to janice142 Send a message via Skype™ to janice142
Re: Best wastewater hose to use

Defender is having their once per year, 4-day sale. It ends tonight at 2350.
__________________

__________________
janice142 is offline   Reply With Quote
Reply

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Nigel Caulder on Hoses GordMay Construction, Maintenance & Refit 19 30-06-2015 13:14
Double Hose Clamps ? GordMay Construction, Maintenance & Refit 41 19-10-2009 14:57
Vent Hose Whistle stuffinbox Construction, Maintenance & Refit 2 07-11-2006 02:50
Head discharge lines clogged with marine growth? ssullivan Plumbing Systems and Fixtures 27 23-10-2006 10:04
Waste Tank and Hose Replacement Project Latitude9.5 Plumbing Systems and Fixtures 5 06-08-2006 12:26



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 03:45.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.