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re: cheap water tank needed !
20 feb 2005
precisionmachinist wrote:
>"turtle" wrote:
>>the water comes out of the ground through a 2" pipe just rammed in the sand
>>about 12 feet down and then dug out around it about 2 feet on all sides and
>>poured concrete in the hole around it and makes the water come up the pipe
>>and go into the tank... at a rate of a little over 1 gallon per minute.
that's 1440 gallons a day, all the time? how much do you need to store?
>>now i had a tank and pump hooked up to a old sheet metal tank to pump from...
how big was that tank?
>>...i called about another sheet metal tank or a plastic tank of 200 to 300
>>gallons and found they cost about $270.00 to $400.00. what could a fellow
>>use as a tank that would cost less than $200.00...
you might expand the 2' hole around the pipe and line it with epdm rubber,
with a hose clamp around the pipe and a concrete block compression ring at
the top and a flattish dome covered with welded wire fence and epdm over that.
>>...i have a space of 45" x 85" to fit the holding tank in and the highth
>>would have to be less than 6 feet 9 inches high.
a 3'x7'x4'-tall box would hold 700 gallons, with an 11'x15' folded liner;
3 walls might be reinforced shed walls. the sideways pressure at the bottom
would be about 250 psf. you might screw a flat perimeter 2x4 to the plywood
bottom and sides with and 4 bolted horizontal double 2x4 hoops above that (1
flat 2x4 on the short walls, sandwiched between 2 on the long walls), with
some spiked mending plates to spread the bolt load and 3 single 2x4 hoops
above that, and a vertical 2x4 around the top. i wouldn't go higher than 4'.
>i might just line a plywood box with some plastic sheeting, maybe the vinyl
>like they use for above ground swimming pools....
epdm rubber would work, at about 30 cents/ft^2. two layers of 6 mil greenhouse
polyethylene film might also work, at about 5 cents/ft^2 per layer.
nick
20 s=3.5^2*3/6'doubled 2x4 modulus (in^3)
30 f=1000'max fiber stress in bending (psi)
40 m=s*f'bending moment (in-lb)
50 w=8*m/84'total force on 7' 2x4 (pounds)
60 ppf=w/7'load per linear foot (lb/ft)
70 c=ppf/62.33'quadratic term
80 d1=(4+sqr(4^2-4*c))/2'depth of 1st hoop from bottom (ft)
90 w1=4-d1'height band width supported by 1st hoop (ft)
100 print "1 2",12*d1
110 c=2*c'quadratic term
120 b=w1-2*d1'quadratic term
130 w2=(-b-sqr(b^2-4*c))/2'band width supported by 2nd hoop (ft)
140 d2=d1-w1/2-w2/2'depth of 2nd hoop from bottom (ft)
150 print "2 2",12*d2
160 b=w2-2*d2'quadratic term
170 w3=(-b-sqr(b^2-4*c))/2'band width supported by 3rd hoop (ft)
180 d3=d2-w2/2-w3/2'depth of 3nd hoop from bottom (ft)
190 print "3 2",12*d3
200 b=w3-2*d3'quadratic term
210 w4=(-b-sqr(b^2-4*c))/2'band width supported by 4th hoop (ft)
220 d4=d3-w3/2-w4/2'depth of 4th hoop from bottom (ft)
230 print "4 2",12*d4
240 c=c/2'quadratic term for single 2x4
250 b=w4-2*d4'quadratic term
260 w5=(-b-sqr(b^2-4*c))/2'band width supported by 5th hoop (ft)
270 d5=d4-w4/2-w5/2'depth of 5th hoop from bottom (ft)
280 print "5 1",12*d5
290 b=w5-2*d5'quadratic term
300 w6=(-b-sqr(b^2-4*c))/2'band width supported by 6th hoop (ft)
310 d6=d5-w5/2-w6/2'depth of 6th hoop from bottom (ft)
320 print "6 1",12*d6
330 print "7 1",12*(d6-w6/2)/2
hoop #2x4 depth (in)
1 2 43.58255
2 2 38.89918
3 2 33.55583
4 2 27.14029
5 1 21.33781
6 1 16.09097
7 1 6.549896
that's 13 8' 2x4s for the long walls plus 9 4' 2x4s for the short walls...
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