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Water Tank Repairs
4

Water Tank Repairs

Water Tank Repairs

(OP)
I am repairing my water tank that was damaged during the a recent earthquake.  QUESTION:
My tank is made of 4'by 8' 5/8th inch plywood & 4"x4" verticles with a plastic liner & sits on gravel. I want to replace the rusted three bands of 1/2" steel rod stock with stainless steel cable.
The round tank is 13,000 gallons,4 ft high,& 24 ft diameter. What I want to know is; what minimum tensile strength cable do I need to hold it all together?  I will be putting three or four seperate loops around the tank. Ballpark figures would be be OK.

RE: Water Tank Repairs

Because of stainless steel's lower yield point, I'd be inclined to use a larger net section of cable.  

Or paint the steel.

Related question:  Steel bands on wooden pipe and tanks are normally threaded on both ends, and 'crossed' in a cast fitting that sits between the nuts, so you can tension the bands.  How will you tension the cable?




Mike Halloran
Pembroke Pines, FL, USA

RE: Water Tank Repairs

artfarmartfarm:  Tensile yield strength of typical stainless steel is Sy = 210 MPa; and a factor of safety of FS = 2 isn't uncommon. I'm currently getting D = {(FS)(50914 N)(2n+0.5)/[(Sy)(n+1)^2]}^0.5, where n = number of cables, Sy = cable tensile yield strength (MPa), and D = unstranded cable diameter (mm). E.g., if n = 3, FS = 2, and Sy = 210 MPa, this gives D = 14.04 mm. If the cable is stranded, then the total cross-sectional area of the strands would need to equal the above unstranded cross-sectional area.

RE: Water Tank Repairs

You can also order 301, 302 or 304 stainless steel wire product form in full hard, 3/4 or 1/2 hard conditions from cold working to increase yield and tensile strengths for this application.

RE: Water Tank Repairs

Here is one of many sites that carry Stainless Steel wire rope.  You might want to look at hot dipped galvanized wire rope.
This page if for non-flexible wire rope that requires special terminal ends. If you use a more flexible construction there will be a lot more termination possibilities but at a cost.

http://www.loosco.com/

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