Siphon break question - SailNet Community

   Search Sailnet:

 forums  store  

Quick Menu
Boat Reviews  
Search SailNet 
Boat Search (new)

Shop the
SailNet Store
Anchor Locker
Boatbuilding & Repair
Hatches and Portlights
Interior And Galley
Marine Electronics
Other Items
Plumbing and Pumps
Sailing Hardware
Trailer & Watersports
Clearance Items

Advertise Here

Go Back   SailNet Community > On Board > Gear & Maintenance
 Not a Member? 
Old 10-25-2003
Junior Member
Join Date: Apr 2003
Posts: 6
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
graham1 is on a distinguished road
Siphon break question

The intake to my electric head is plumbed as follows: from the thru-hull to the siphon break to the pump that takes water into the head. (The siphon break is a rubber "duck bill" type). It seems to me that the suction the pump makes bringing the water over the siphon break will be enough to open the break and suck in air.

When I cover the siphon break with my thumb, it brings in water. When I stop pumping and take my thumb off, I can hear air bleeding in and then I can''t bring in any more water no matter how long I pump.

I don''t think a rubber type siphon break will work on the suction side of a pump and the only solution is to use a solenoid. Am I right?
Reply With Quote Share with Facebook
Old 10-26-2003
Senior Member
Join Date: Jul 2002
Posts: 1,120
Thanks: 0
Thanked 2 Times in 2 Posts
Rep Power: 13
WHOOSH is on a distinguished road
Siphon break question

Graham, the set-up you''re describing is commonly done...and when the siphon break prevents the pump from working well (after all, it IS breaking the siphon...) then it''s either removed or defeated. You want the siphon break on the INcoming line to be between the pump and the bowl. That way the pump is not affected, yet the pump can''t feed the bowl and overflow.

Obviously, the other siphon break is downstream of the pump. Both breaks should be mounted above the dynamic waterline, meaning as high as you can get them for ease of mind.

A solenoid will make things even MORE complicated. You''ve already done this by virtue of using an electric head; no reason to compound the problem further.

Reply With Quote Share with Facebook
Old 11-12-2003
Junior Member
Join Date: Apr 2003
Posts: 6
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
graham1 is on a distinguished road
Siphon break question

Thanks for the reply, Jack.
While I agree with the comment about an <electric> head, there were other considerations.
Reply With Quote Share with Facebook

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools

Posting Rules
You may post new threads
You may post replies
You may post attachments
You may edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On

Similar Threads
Thread Thread Starter Forum Replies Last Post
Ladder question mcain Gear & Maintenance 14 08-03-2007 10:28 PM
GPS question wallm General Discussion (sailing related) 13 05-30-2004 02:10 AM
leak from engine raw water siphon break i670684 Gear & Maintenance 2 08-11-2003 05:53 AM
question on sails Mark_OD23 General Discussion (sailing related) 6 11-19-2002 04:41 PM
Chainplate break!! MikeToogood Gear & Maintenance 0 02-20-2001 02:55 PM

All times are GMT -4. The time now is 10:37 PM.

Add to My Yahoo!         
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
SEO by vBSEO 3.6.1
(c) LLC 2000-2012

The store is owned and operated by a company independent of the forum. You are now leaving the SailNet forum. Click OK to continue or Cancel to return to the SailNet forum.