can you mate marelon seacock to bronze thru hull - SailNet Community

   Search Sailnet:

 forums  store  


Quick Menu
Forums           
Articles          
Galleries        
Boat Reviews  
Classifieds     
Search SailNet 
Boat Search (new)

Shop the
SailNet Store
Anchor Locker
Boatbuilding & Repair
Charts
Clothing
Electrical
Electronics
Engine
Hatches and Portlights
Interior And Galley
Maintenance
Marine Electronics
Navigation
Other Items
Plumbing and Pumps
Rigging
Safety
Sailing Hardware
Trailer & Watersports
Clearance Items

Advertise Here






Go Back   SailNet Community > On Board > Gear & Maintenance
 Not a Member? 
  #1  
Old 06-22-2008
saurav16's Avatar
Senior Member
 
Join Date: Mar 2007
Location: NY
Posts: 312
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 8
saurav16 is on a distinguished road
Send a message via AIM to saurav16
can you mate marelon seacock to bronze thru hull

can you mate marelon seacock to bronze thru-hull? I understand that all marelon fittings are NPS and the bronze seacock is nps as well. Any thoughts?
Reply With Quote Share with Facebook
  #2  
Old 06-22-2008
johnshasteen's Avatar
Senior Member
 
Join Date: Aug 2002
Location: Houston, TX
Posts: 649
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 13
johnshasteen is on a distinguished road
Don't, marelon isn't nearly as strong as bronze for seacocks - the last thing you want is a seacock breaking at sea. With bronze all you have to worry about is electrolysis.
__________________
s/v Paloma, Bristol 29.9, #141
Slipped in Bahia Marina, easy access to Corpus Christi Bay and the Gulf of Mexico.
Reply With Quote Share with Facebook
  #3  
Old 06-22-2008
Senior Member
 
Join Date: Oct 2006
Location: Virginia
Posts: 722
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 8
badsanta is on a distinguished road
even though the same size, the threads are different. the thru hull is streight thread the valve is tapered. they should be connected with an adapter plate. Check out this Boat Projects Gallery Photo Gallery by Maine Sailing at pbase.com
Reply With Quote Share with Facebook
  #4  
Old 06-22-2008
Maine Sail's Avatar
Senior Member
 
Join Date: Jan 2003
Location: Maine Coast
Posts: 5,296
Thanks: 10
Thanked 117 Times in 85 Posts
Rep Power: 15
Maine Sail is just really nice Maine Sail is just really nice Maine Sail is just really nice Maine Sail is just really nice
Quote:
Originally Posted by saurav16 View Post
can you mate marelon seacock to bronze thru-hull? I understand that all marelon fittings are NPS and the bronze seacock is nps as well. Any thoughts?
If you have an NPS marelon ball valve, which is rare, and an NPS thru-hull NO you can not mate these two together!

Yes they WILL go together but NPS-M threads are "mechanical" only as in NPS-M, M for mechanical. Mechanical threads, are not, and were NEVER intended to seal against positive pressure or to be water tight!

NPT & NPT (tapered) threads mate together to SEAL OUT, (or in) water!! NPS & NPT is a dangerous mis-match but it will, sort of, seal out water..
__________________
______
-Maine Sail / CS-36T


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.




© Images In Posts Property of Compass Marine Inc.



Last edited by Maine Sail; 06-22-2008 at 05:09 PM.
Reply With Quote Share with Facebook
  #5  
Old 06-22-2008
sailingdog's Avatar
Telstar 28
 
Join Date: Mar 2006
Location: New England
Posts: 43,291
Thanks: 0
Thanked 9 Times in 9 Posts
Rep Power: 13
sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice
The other problem is that you probably shouldn't put a plastic seacock over a metal through-hull since metal tends to expand and contract more than the plastic will.
__________________
Sailingdog

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Telstar 28
New England

You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.

—Cpt. Mal Reynolds, Serenity (edited)

If you're new to the Sailnet Forums... please read this
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
.

Still—DON'T READ THAT POST AGAIN.
Reply With Quote Share with Facebook
  #6  
Old 06-22-2008
Owner, Green Bay Packers
 
Join Date: Sep 2006
Location: SW Michigan
Posts: 10,318
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 11
sailaway21 is just really nice sailaway21 is just really nice sailaway21 is just really nice sailaway21 is just really nice
Halekai will edit his post to reflect that the valve has NPT threads and then it will make sense to you as well as being correct. badsanta is correct in that you need an adapter coupling to go between the two types of threads.

As Dog suggests, do not ever put a female plastic fitting over a male metal fitting. This practise causes flooded basements in houses where there is no motion and little vibration. Imagine what could happen on your boat. If you are to use metal and plastic together, the plastic should always be the male fitting and held in compression. Otherwise, while you may get lucky and crack the plastic during installation, giving you a warning that you're not conducting a good pipefitting exercise, the plastic will most likely appear just fine until it fails at the worst possible moment. Instantaneously you'll be reduced to pounding a tapered wooden plug in it-assuming you carry them-or an amazement at how fast water can flow through such a relatively small hole.

If you're to mix and match doing this the proper procedure would be to put a plastic nipple into the Marelon valve (I recommend Schedule 80 and do not get the cast and then threaded nipples-get one that is turned. The cast nipples will have either lands on their side or you'll see a tiny seam from the casting running down them and they are substantially weaker than a turned nipple made of Sked 80 PVC.). Then that nipple can be threaded into a female NPT to female NPS adapter to complete your installation.
__________________
“Scientists are people who build the Brooklyn Bridge and then buy it.”
Wm. F. Buckley, Jr.
Reply With Quote Share with Facebook
  #7  
Old 06-22-2008
sailingdog's Avatar
Telstar 28
 
Join Date: Mar 2006
Location: New England
Posts: 43,291
Thanks: 0
Thanked 9 Times in 9 Posts
Rep Power: 13
sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice
Sway-

Some of the marelon ball valve seacocks are NPS threaded, but they're generally not sold in the US.
__________________
Sailingdog

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Telstar 28
New England

You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.

—Cpt. Mal Reynolds, Serenity (edited)

If you're new to the Sailnet Forums... please read this
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
.

Still—DON'T READ THAT POST AGAIN.
Reply With Quote Share with Facebook
  #8  
Old 06-22-2008
saurav16's Avatar
Senior Member
 
Join Date: Mar 2007
Location: NY
Posts: 312
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 8
saurav16 is on a distinguished road
Send a message via AIM to saurav16
The marelon valve sold at West marine is NPS on both ends

West Marine: Marelon Flanged Seacocks Product Display

Also Haleki all thru hull nipples are NPS only the groco ball valve has an NPS base and and NPT threaded top.
Reply With Quote Share with Facebook
  #9  
Old 06-22-2008
sailingdog's Avatar
Telstar 28
 
Join Date: Mar 2006
Location: New England
Posts: 43,291
Thanks: 0
Thanked 9 Times in 9 Posts
Rep Power: 13
sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice
Obviously, through hulls have to be NPS or you couldn't cut them to length. Halekai is well aware that through-hulls are NPS, as he states on his photo essay on through-hull installation.
Quote:
Originally Posted by saurav16 View Post
The marelon valve sold at West marine is NPS on both ends

West Marine: Marelon Flanged Seacocks Product Display

Also Haleki all thru hull nipples are NPS only the groco ball valve has an NPS base and and NPT threaded top.
__________________
Sailingdog

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Telstar 28
New England

You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.

—Cpt. Mal Reynolds, Serenity (edited)

If you're new to the Sailnet Forums... please read this
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
.

Still—DON'T READ THAT POST AGAIN.
Reply With Quote Share with Facebook
Reply


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
Ryobi vs. Makita vs. Poliglow?? CLucas Gear & Maintenance 61 05-05-2012 06:02 AM
Assemble thru-hull & seacock...how? flyhop Gear & Maintenance 10 04-09-2008 04:53 PM
Seacocks- Marelon or Bronze bidet Gear & Maintenance 2 11-03-2004 12:07 PM
Spring Hull Cleaning Tom Wood Gear and Maintenance Articles 0 04-05-2004 08:00 PM
hull construction cgha33 Boat Review and Purchase Forum 4 05-23-2003 07:11 PM


All times are GMT -4. The time now is 02:14 AM.

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

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