Notices

Drain plug---why not seacock?

Old 06-21-2007, 01:47 PM
  #1  
Senior MemberCaptains Club Member
Thread Starter
 
Join Date: Aug 2001
Location: Baton Rouge, LA
Posts: 8,823
Default Drain plug---why not seacock?

Just out of curiosity, why put a screw in garboard plug when you can put a valve that can be opened and closed from the bilge access? Never seen it done, and I sure there's a simple reason as to why--enlighten me.



BTW---this has absolutely nothing to do with the fact that I launched my boat without the plug last week and had to make a run for the trailer. That is all.
MakoMyDay is offline  
Old 06-21-2007, 02:02 PM
  #2  
Senior MemberCaptains Club Member
 
Join Date: Aug 2003
Location: Cypress, TX - USA
Posts: 852
Default Re: Drain plug---why not seacock?

Or like some overboard scuppers, have a plastic ball that lets water drain out but not in? I think most hull gas vents have the plastic ball too!
Cat O Lies is offline  
Old 06-21-2007, 02:02 PM
  #3  
Senior MemberCaptains Club Member
 
Join Date: Jan 2005
Location: Hyannis, MA
Posts: 269
Default Re: Drain plug---why not seacock?

First, you don't want it to get opened accidentally, and you could have 6'' of water in the bilge, before it flows into the seacock.
timbb is offline  
Old 06-21-2007, 02:06 PM
  #4  
Senior MemberCaptains Club Member
 
Join Date: Aug 2003
Location: Cypress, TX - USA
Posts: 852
Default Re: Drain plug---why not seacock?

timbb - 6/21/2007 2:02 PM

First, you don't want it to get opened accidentally, and you could have 6'' of water in the bilge, before it flows into the seacock.
Actually, if you screwed a 3-4" nipple on the inside of the bilge drain hole and installed a ball cock valve on the end of the nipple, then you wouldn't have more than a inch in the bilge, at which point your bilge pump would take care of.
Cat O Lies is offline  
Old 06-21-2007, 02:07 PM
  #5  
kbs
Senior Member
 
Join Date: Apr 2001
Location: Alabama
Posts: 238
Default Re: Drain plug---why not seacock?

The garboard drain is uaually at or below the lowest level of the bilge. A seacock would be several inches above this. The one way flow valves are great above deck where you can visually see a fault. A fault down in the bilge might not be noticed until it's to late.
I do think it's great that we as boat owners are asking these "why's". SOmebody probably once said "wouldn't it be great if we could remove the horse part of the carriage"
kbs is offline  
Old 06-21-2007, 02:10 PM
  #6  
Senior MemberCaptains Club Member
 
Join Date: Aug 2003
Location: Cypress, TX - USA
Posts: 852
Default Re: Drain plug---why not seacock?

"A seacock would be several inches above this."

Why wouldn't you install the seacock valve parallel with the botton of the bilge? You thinking it is verticle! Think outside of the bilge for a second!

"I do think it's great that we as boat owners are asking these "why's". SOmebody probably once said "wouldn't it be great if we could remove the horse part of the carriage""

I have upgrade many designs on my boat where the "experts" thought they had it nailed!
Cat O Lies is offline  
Old 06-21-2007, 02:28 PM
  #7  
kbs
Senior Member
 
Join Date: Apr 2001
Location: Alabama
Posts: 238
Default Re: Drain plug---why not seacock?

Running parralell would either require a 90 (well known to plug with gravity flows of very low head pressure) or it would require mounting at the connection point of the hull bottom and boat side (weaking structural properties).
A garboard drain is for when the boat is out of the water. You leave it open to prevent water accumalation. Sea water valves are for routine opening and closing whiel at sea.
This is the main reason I come here. You folks come up with some of the greatest ideas. If you only knew how many of your GREAT ideas I have implemented, I'd owe you fortunes.
kbs is offline  
Old 06-21-2007, 02:39 PM
  #8  
Senior MemberCaptains Club Member
 
Join Date: Feb 2002
Location: North East
Posts: 5,938
Default Re: Drain plug---why not seacock?

I see his point because if the drain plug is removed only when the boat is out of the water (My boat sits on a trailer) then why not use a valve instead of a screw in plug? What advantage does the screw in plug have to offer which a valve of some sort could not accomplish?
FireFly is offline  
Old 06-21-2007, 02:47 PM
  #9  
Senior MemberCaptains Club Member
PLEDGERPLEDGERPLEDGERPLEDGER
 
Snapper Head's Avatar
 
Join Date: Mar 2002
Location: Republic of West Florida - the ORIGINAL lone star state
Posts: 17,780
Default RE: Drain plug---why not seacock?

Debris would also be an issue with a seacock. It is easy to get gunk, etc. out of the garboard hole; not as easy with a seacock, and the debris will eventually damage the gate or ball, which will begin to leak. Or you get some debris that works its way in a prevents the valve from closing completely.

A seacock would work, it just is not the best application for bilge drainage. The garboard drain is mega-simple, and will not break off while at sea. One less thing to worry about, one less possible failure point.

Big Al
Snapper Head is offline  
Old 06-21-2007, 02:51 PM
  #10  
Senior MemberCaptains Club Member
 
Join Date: Feb 2003
Location: Butner NC
Posts: 404
Default Re: Drain plug---why not seacock?

FireFly - 6/21/2007 3:39 PM

What advantage does the screw in plug have to offer which a valve of some sort could not accomplish?
Lack of elevation. The screw in plug lets all of the water drain out when on the trailer. A valve would have to be high enough off the bottom to allow it to turn/thread. It would require at least the hight of the valve plus the handle. You would never get the bilge empty...short of a shop vac.
seaclusion is offline  
Old 06-21-2007, 03:24 PM
  #11  
Senior MemberCaptains Club Member
 
Join Date: Aug 2003
Location: Cypress, TX - USA
Posts: 852
Default Re: Drain plug---why not seacock?

seaclusion - 6/21/2007 2:51 PM

FireFly - 6/21/2007 3:39 PM

What advantage does the screw in plug have to offer which a valve of some sort could not accomplish?
Lack of elevation. The screw in plug lets all of the water drain out when on the trailer. A valve would have to be high enough off the bottom to allow it to turn/thread. It would require at least the hight of the valve plus the handle. You would never get the bilge empty...short of a shop vac.
Remove the drain from the boat and put the nipple through the hole where the drain was. Screw the nipple into the drain on the outboard side, then screw the seacock onto the nipple on the bilge side. Adjust the seacock so that when you insert the brass drain back into the hole, the screw holes line up.
Cat O Lies is offline  
Old 06-21-2007, 03:45 PM
  #12  
Senior MemberCaptains Club Member
 
Join Date: Feb 2003
Location: Butner NC
Posts: 404
Default Re: Drain plug---why not seacock?

Cat O Lies - 6/21/2007 4:24 PM

seaclusion - 6/21/2007 2:51 PM

FireFly - 6/21/2007 3:39 PM

What advantage does the screw in plug have to offer which a valve of some sort could not accomplish?
Lack of elevation. The screw in plug lets all of the water drain out when on the trailer. A valve would have to be high enough off the bottom to allow it to turn/thread. It would require at least the hight of the valve plus the handle. You would never get the bilge empty...short of a shop vac.
Remove the drain from the boat and put the nipple through the hole where the drain was. Screw the nipple into the drain on the outboard side, then screw the seacock onto the nipple on the bilge side. Adjust the seacock so that when you insert the brass drain back into the hole, the screw holes line up.
Would the threads work? I can't remember the name of them, but some threads are cut a "special" way so they will not only tighten, but seal as well, eliminating tape/dope. Would they work "backwards"? Forgive my senior moment on the name of the threads.
seaclusion is offline  
Old 06-21-2007, 03:50 PM
  #13  
Senior MemberCaptains Club Member
 
Join Date: Nov 2004
Location: MA, USA
Posts: 5,598
Default Re: Drain plug---why not seacock?

K.I.S.S. - & that's the garboard...

Sorry, mmk - been there done that too. Fortunately realized before getting off the trailer - couldn't figure out why it wasn't floating free of the trailer - definitely has me thinking about a bilge alarm, but that would also require I remeber to switch on the batteries before launching - it's hard to remove the human element out of this boating thing...

I bet you don't forget again for a looong time though.
kitebuz is offline  
Old 06-21-2007, 03:55 PM
  #14  
Senior MemberCaptains Club Member
 
Join Date: Feb 2002
Location: North East
Posts: 5,938
Default Re: Drain plug---why not seacock?

I guess any type of a valve would likely get corroded when exposed to salt water over a period of time. Makes sense.
FireFly is offline  
Old 06-21-2007, 03:57 PM
  #15  
kbs
Senior Member
 
Join Date: Apr 2001
Location: Alabama
Posts: 238
Default Re: Drain plug---why not seacock?

Mako, I'll admit nothing either, but when I had a trailer boat, my keys were stored in the bilge next to the drain
kbs is offline  
Old 06-21-2007, 04:38 PM
  #16  
Senior MemberCaptains Club Member
 
Join Date: Nov 2006
Location: Florida Keys
Posts: 5,979
Default Re: Drain plug---why not seacock?

kbs - 6/21/2007 3:57 PM

Mako, I'll admit nothing either, but when I had a trailer boat, my keys were stored in the bilge next to the drain
THIS I love (and may start doing.)
KeyPineSavage is offline  
Old 06-21-2007, 04:49 PM
  #17  
Senior MemberCaptains Club Member
 
Join Date: Nov 2004
Location: MA, USA
Posts: 5,598
Default Re: Drain plug---why not seacock?

I put my plug inside the little key ring float - reminds me when I prep the boat for launch and put the keys in the ign. and one key is significantly heavier than the other.
kitebuz is offline  
Old 06-21-2007, 04:52 PM
  #18  
Senior MemberCaptains Club Member
 
Join Date: Jan 2006
Location: Miami, Fl.
Posts: 507
Default Re: Drain plug---why not seacock?

I laughed at my bosses brother for forgetting the drain plug. I know my day will come, it will happen sooner or later.
HenryJ is offline  
Old 06-21-2007, 05:19 PM
  #19  
Senior MemberCaptains Club MemberPLEDGER
 
Join Date: Nov 2005
Location: Central Jersey
Posts: 7,961
Default Re: Drain plug---why not seacock?

seaclusion - 6/21/2007 3:45 PM

Would the threads work? I can't remember the name of them, but some threads are cut a "special" way so they will not only tighten, but seal as well, eliminating tape/dope. Would they work "backwards"? Forgive my senior moment on the name of the threads.
You beat me to it. The garboard plug has a TAPERED thread, which seals tight on the inside. If they didn't have a tapered thread, they would never stop threading into the female; they would just screw all the way through. through-hull fittings for seacocks have a straight thread -- the nut that holds them against the hull will thread all the way down until the hull provides the resistance for it to stop threading. The garboard plug provides that resistance inside the fitting.
t3rockhall is offline  
Old 06-21-2007, 05:27 PM
  #20  
Senior MemberCaptains Club Member
 
Join Date: Feb 2003
Location: PA
Posts: 239
Default RE: Drain plug---why not seacock?

It is just as easy to forget to close a valve as it is to forget to put the drain plug in, and it is easier for the valve to accidently be opened than for the drain plug to accidently fall out.
dmartin is offline  

Thread Tools
Search this Thread