| |
Bertram31.com General Bulletin Board
Re: SS Tank *LINK* *PIC*
Posted By: Capt Patrick McCrary In Response To: Re: SS Tank (Ian Upton)
Date: Thursday, 17 March 2005, at 2:40 p.m.
Ian,
Work hardening and seam failure was one of my concerns also...
In talking to Doug at Nautic Marine, he has assured me that with his way if TIG welding and tank design there should be no problem. He does some pretty large tanks and quite a few of them are done for the Coast Guard, so he does have time in grade.
On a lesser boat, say a Bayliner or Ocean Yacht, there would certainly be enough twisting and racking of the hull underway to transmit through to the tank. The B31, especially Gerry's '62, is a pretty rigid platform. Together with Doug's assurance and proper installation of the tank, I feel confident that such a problem will be many years coming, if ever.
The design came out to be 255 gallon max capacity, done in 304 stainless. I picked up the tank, brought it back to the shop, completely degreased it, cleaned it thoroughly with acetone & denatured alcohol. The next step was to prime it with a thin wash of zinc chromate paint and then cover it with a white epoxy bed liner material.
After the epoxy coating cured I laminated 3 full length 1 1/2" strips of 3/8" PVC Foam Board to each side of the dead rise to isolate the tank from the hull.
When we do the installation, the sides, between the stringers & tank, will be foamed in with 2 part 3 lb/cu ft.
The PVC stringers will add cushion between the tank & hull in addition to allowing the underside to breathe.
Hopefully the life span of the tank will exceed my own...
Best regards,
Patrick
| |
Bertram31.com General Bulletin Board is maintained by Patrick McCrary with WebBBS 5.12.