[alberg30] holding tank photo

[Mpete53 at aol.com]

This is the tank top that I made to convert the forward compartment under the 
cabin sole into a holding tank.

I used polyester resin and matte to make the top and tubes. The tubes were 
made then glassed into the top with West System epoxy and fillers. After the 
top parts were glassed in place, I coated the underside of the top and the 
hull liner with two coats of West System resin. The final mounting of the top 
was done using only 3M 5200. 

With the top in place and two weeks for the 5200 to set, I pressure tested by 
filling a long loop of hose connected to the vent line with water then 
pumping the head. The water in the hose was my pressure gage. As the air 
pressure in the tank increases, the water gets pushed up the loop. I stopped 
when I had about 5 Ft. difference in the water levels (about 2 psi). The 
fiberglass top and the 5200 passed the test (with such a large area the 2 psi 
meant that the 5200 had to resist about 1500 lb of force). With 2 psi of air 
pressure in the whole system I could then use soapy water to check tank top 
and the rest of the system for leaks. The only leak that I had was the 
inspection plate in the top. The O-ring seal leaked ever so slightly, but a 
bead of plumbers putty sealed it tight.

I did the job 2 1/2 seasons ago and it is still well.

Attached is a JPG photo (55k) of the tank top in place with the hoses 
connected.

I have additional photos if the installation but I don't want to post more 
photos unless to group wants to see them. I will email them to those 
interested.

Mark 
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