Water tank replacement options - 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 10-06-2007
Valiente's Avatar
Senior Member
 
Join Date: Jun 2006
Location: Toronto
Posts: 5,491
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 10
Valiente has a spectacular aura about Valiente has a spectacular aura about
Water tank replacement options

I have two roughly 100 gallon freshwater tanks suspended beneath my side decks on either side of the engine compartment. They are supported on struts to the framing below (it's a steel boat) and there is about two feet of "curved space" below each oblong tank. They are about 18" W x 48" L x 22" H.

The tanks are SS and to judge by the noises they make flexing when full in a seaway, they are unbaffled.

I wish to make new tanks that are fitted to the curve of the hull down low. The boat is currently a tad tender (although I am very much lightly loaded at the moment), and I feel that putting the tanks down low will lower the CG, lower the "slosh" factor, will permit "from above" hose barbs and inspection ports and will free up considerable space above the tanks for large, light things that can stand the warmth from the engine, which will still be a good three feet away on either side. It would also allow a more sensible water fill and manifold set-up and would vent UP instead of the current down into the keel bilge.

My questions are these:

Would it be best to stick with two large SS tanks as is the case now?

Would a set of four or more be better for ballast, "slosh" and cross-containmination issues?

Is there a case for "bladders" of the Plastimo type? If so, how is remaining capacity gauged on such a tank?

Am I missing any obvious tank building materials suitable for a steel boat? What are the best ways to secure tanks firmly and yet isolate them from hard points and corrosion issues? (Once they go in, they aren't going to move unless its' absolutely necessary).

Thanks. I want to do the right thing here.
Reply With Quote Share with Facebook
  #2  
Old 10-06-2007
all these confusing ropes
 
Join Date: Aug 2006
Posts: 166
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 8
dohenyboy is on a distinguished road
Avoid bladders -- they break, leak eventually and don't use all the available space
Plastic tanks will never corrode
Reply With Quote Share with Facebook
  #3  
Old 10-06-2007
billangiep's Avatar
Senior Member
 
Join Date: Dec 2003
Location: Florida Gulf Coast
Posts: 295
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 11
billangiep is on a distinguished road
Val..I'm also working on my fresh water system..leaning more toward the plastic type....here's a couple sources.
http://www.tank-depot.com/browse.aspx?id=8

http://www.ronco-plastics.net/
Reply With Quote Share with Facebook
  #4  
Old 10-07-2007
Here .. Pull this
 
Join Date: Jan 2007
Posts: 2,031
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 8
Sailormann will become famous soon enough
Plastic - or if you're feeling rich - Monel. Plastic will absorb a bit of taste but it dissipates quickly. Monel lasts pretty well forever. Stainless will eventually corrode. Bladders are standard equipment on MacGregors.
Reply With Quote Share with Facebook
  #5  
Old 10-07-2007
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
Rigid plastic tanks are probably the best way to go. I would recommend four tanks, since it would provide better protection against contamination, and allow you spread the load out more for ballast purposes.

Another option is to have fiberglass tanks made. They can be made custom to fit your boat, and may be a better choice in terms of strength, weight and longevity.
__________________
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 10-07-2007
USCGRET1990's Avatar
SENIOR CHIEF
 
Join Date: May 2007
Location: YORKTOWN, VA
Posts: 1,380
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 8
USCGRET1990 is on a distinguished road
Quote:
Originally Posted by sailingdog View Post

Another option is to have fiberglass tanks made. They can be made custom to fit your boat, and may be a better choice in terms of strength, weight and longevity.
I agree with this as well...in that it is a design issue, you might want to bounce it off these folks, as some of them are builder/designers and quite knowledgeable:

http://www.boatdesign.net/forums/sea...archid=1086045
Reply With Quote Share with Facebook
  #7  
Old 10-07-2007
Senior Member
 
Join Date: Sep 2006
Posts: 2,179
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 8
Rockter will become famous soon enough
I would avoid bladders unless you really must. I found it difficult to keep the water fresh.
Reply With Quote Share with Facebook
  #8  
Old 10-07-2007
Valiente's Avatar
Senior Member
 
Join Date: Jun 2006
Location: Toronto
Posts: 5,491
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 10
Valiente has a spectacular aura about Valiente has a spectacular aura about
Thanks for all the suggestions, people: bladders were suggested to me by a boat repair guy, and they were but a passing fancy.

Plastic tanks of the HDPE variety might be nice and I concur that four 50 gallon tanks make considerably more sense. There's no reason I can't have inspection ports and the stand-offs, bracing and strapping are simpler with a smaller tank as long as I eliminate any chance of chafing or friction.

I would do a fibreglass keel tank, but these are not keel tanks, but "either side of the engine bay" tanks.

I'll throw out another question: What do people think of the new(ish) snap-together plumbing fittings for marine use, given the low pressures involved and the tendency of hoses to discolour and get grotty?

Here's an example of what I mean: it strikes me that from deck fill to tap, the less metal I have the better, which is the opposite of how I feel about through-hulls and fuel manifolds.

http://www.globalspec.com/FeaturedPr...Valves/46269/0
Reply With Quote Share with Facebook
  #9  
Old 10-07-2007
US27inKS's Avatar
Midwest Puddle Pirate
 
Join Date: Feb 2005
Location: Gardner, KS
Posts: 2,160
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 11
US27inKS has a spectacular aura about US27inKS has a spectacular aura about
I've used some of those plastic fittings. Make sure your lines are cut square, and push the lines all the way into the fitting. Otherwise they are fabulous. You can assemble the plumbing on your boat in minutes. There is actually a marine plumbing supplier offering these, but I can't remember who. Stick with the Watts brand. Better to pay the HD price than the WM price.
Reply With Quote Share with Facebook
  #10  
Old 10-08-2007
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
I'd second what US27inKS said. HD is much less expensive.
__________________
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
What's your biggest bonehead move sailing? CharlieCobra Seamanship & Navigation 569 1 Week Ago 04:48 PM
Patching water tank? geary126 Gear & Maintenance 10 01-03-2008 06:19 PM
water tank buildup smaconf@msn.com Hunter 2 11-30-2007 08:51 AM
Why have a gray water tank? haukebo Gear & Maintenance 7 11-09-2006 09:26 PM


All times are GMT -4. The time now is 02:44 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