SailNet Community - Reply to Topic

   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 > Drains, valves, and seacocks: weighing the alternatives
 Not a Member? 


Thread: Drains, valves, and seacocks: weighing the alternatives Reply to Thread
Title:
  

By choosing to post the reply below you agree to the rules you agreed to when joining Sailnet.
Click Here to view those rules.

Message:
Trackback:
Send Trackbacks to (Separate multiple URLs with spaces) :
Post Icons
You may choose an icon for your message from the following list:
 

Register Now

In order to be able to post messages on the SailNet Community forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
Please note: After entering 3 characters a list of Usernames already in use will appear and the list will disappear once a valid Username is entered.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Click here to view the posting rules you are bound to when clicking the
'Submit Reply' button below


Additional Options
Miscellaneous Options

Click here to view the posting rules you are bound to when clicking the
'Submit Reply' button below


Topic Review (Newest First)
12-01-2012 11:38 AM
Rusty123
Re: Drains, valves, and seacocks: weighing the alternatives

Cockpit drains are a big hole in the hull. Seacocks give you a way to close the hole in an emergency. That's what it boils down to for me.
12-01-2012 09:43 AM
ambianceack
Re: Drains, valves, and seacocks: weighing the alternatives

I actually need to do a similar repair. The two seacocks that drain the cockpit are not operating and I need to replace hoses. I was thinking about not replacing the seacocks since they do not leak and are in the drain position. Just curious, why are you planning to replace the seacocks? I am not sure if they are needed?
11-29-2012 02:03 AM
Rusty123
Re: Drains, valves, and seacocks: weighing the alternatives

I replaced the hoses with some heavy duty PVC/Vinyl sanitary hoses (Trident XHD). At my next haulout, I'll install new through hulls and seacocks (probably marelon).
11-28-2012 11:59 PM
Watercolor
Re: Drains, valves, and seacocks: weighing the alternatives

Rusty, did you come to any resolution to your problem.
10-31-2012 11:49 PM
Rusty123
Re: Drains, valves, and seacocks: weighing the alternatives

After further investigation, I'm not certain that my existing through-hulls are actually Marelon. They look more like regular nylon. Which pushes me towards replacing them with new Marelon through-hulls and seacocks (at least for the below waterline cockpit drains) at the next haul out. In the meantime, I'll just replace the hoses -- the existing ones just look like an accident waiting to happen.
10-31-2012 08:39 PM
Brent Swain
Re: Drains, valves, and seacocks: weighing the alternatives

I use the type 316 stainless ball valves from the pulp mills, found in scrapyards for $1.50 a pound. They have given me no problems in 40 years. For thru hulls, I weld in type 316 stainless pipe nipples, also from scrapyards for $1.50 a pound. A composting head also eliminates a couple of thru hulls.
For my steel hulls, I use keel cooling and dry exhaust, eliminating a couple more thru hulls.
10-31-2012 08:15 PM
Faster
Re: Drains, valves, and seacocks: weighing the alternatives

If you do decide to add the ball valves, be advised that most valves will be NPT thread (ie tapered) and the through hull threads are not. What that means is that when you install the valves on the through hull threads you'll only get maybe 1 1/2 threads engaged before it tightens up.. not very secure. Check Mainesail's 'how-to' site for the RIGHT way to do this.

Replacing Thru-Hulls and Seacocks Photo Gallery by Compass Marine at pbase.com
10-31-2012 07:11 PM
Rusty123
Re: Drains, valves, and seacocks: weighing the alternatives

asdf38, you make some excellent points.

While I don't sail very often (particularly in the winter), I do visit the boat 2 or 3 times per week. I was actually thinking about leaving the cockpit drains isolated when I'm not sailing, as I have a full canvas cover, so there isn't much rain accumulation. And even if the cover failed, there wouldn't be enough rain to fill the cockpit in a day or two (Seattle area rains often, but not too hard).

As for bilge pump discharge, those would always be open, so having a plug handy is probably a more reasonable approach.
10-31-2012 07:00 PM
asdf38
Re: Drains, valves, and seacocks: weighing the alternatives

I have a few thoughts,

On the one hand it sounds like your hoses aren't in great shape, but on the other hand how long have they been there? They're not leaking now so there is a case to be made to leave them until haul out.

Once hauled I suggest just getting the best components for what you want to do. If that's a proper seacock then do it. Don't skimp on the materials.

But I just don't see a strong case for seacocks here. You can't close them when you're gone so if you are and they spring a leak the boat's sinking anyway. How much time are you going to spend aboard? And if you're lucky enough to be there then you don't need the seacocks to fix the leak - you'll have other options like plugs, tape etc. So what do you think they'll get you?
10-31-2012 05:57 PM
Rusty123
Drains, valves, and seacocks: weighing the alternatives

As I posted in another thread, my recently purchased 1981 Spirit 28 does not have any sort of isolation valves for the cockpit drains (which are below the water line) nor the bilge pump overboards (which are not). The hoses are connected to 1-1/2" barb-type through-hulls, which appear to be Marelon.

While the bilge pump hoses appear sound, the cockpit drain hoses are pretty sketchy - thin wall wire reinforced, with plastic "cuffs" (look like vacuum cleaner hoses). One is also a little short, so it's slightly skewed on the barb (although it is double clamped, and doesn't leak).

Ideally, I would like to replace all the through-hulls with proper seacocks. However, I don't plan to haul out until spring at the earliest. But I'm nervous about those drain hoses, so I don't want to leave it as is for any longer than necessary.

I've modified a plumbing pressure test plug to fit security in the outside of the through-hull, so I can make some minor modifications in the water. Here are the options I can see:

1. Replace the cockpit drain hoses with better quality, correctly sized replacements, and then install seacocks at next haulout. This would be the cheapest and easiest (at least in the short term), but would still leave the drains vulnerable to a hose failure (freezing, for example) in the meantime, and with no way to isolate drains or bilge discharge in case of a calamity.

2. As a temporary measure, install Marelon ball valves on the existing through-hulls (I would need to cut off the barb section of the through-hull, but there appears to be plenty of threads available). But ball valves are plenty expensive (over $100 each - almost as much as seacocks), so I'm reluctant to make that investment, only to replace them with seacocks in 6 months.

3. Install the ball valves as described above, but as a permanent fix. If I went with this option, I would trim the through-hull such that the valve is snug against the retaining ring, which would somewhat reduce the likelihood of snapping off the assembly.

Thoughts or suggestions?

Russ

 
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


All times are GMT -4. The time now is 07:40 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.