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Safe Load Calculation

 
Five times the weight of the
water-filled pipe plus 250 lbs
Weight
of H2O
(#/gal)		 x Gal/ft
(see chart)		 = Weight/ft
of H2O
8.34# x .3840 = 3.20#
Weight/ft
of Pipe
(see chart)		 + Weight/ft
of H2O		 = Weight/ft
of Water-filled Pipe
7.575# + 3.20# = 10.775#
Weight/ft
of Water-filled Pipe		 x Length
of Pipe		 = Actual
Weight
per 15 ft
10.775# x 15' = 161.63#
Safety
Factor 		x Actual
Weight
+ 250#		 = Safety
Load
5 x 161.63#
+ 250#		 = 1058#
Example based on 15ft. of 3" pipe (Schedule 40)

 

Standard Pipe Data
Nominal
Pipe
Diam.
(in)		 Actual
Inside
Diam.
(in)		 Actual
Outside
Diam.
(in)		 Weight
Per
Foot
(lbs)		 Length
Containing
1 Cubic
Foot (ft)		 Gallons
in One
Lineal
Foot
¾ 0.824 1.050 1.130 270.030 .0277
1 1.049 1.315 1.678 166.620 .0449
1¼ 1.380 1.660 2.272 96.275 .0777
1½ 1.610 1.900 2.717 70.733 .1058
2 2.067 2.375 3.652 49.913 .1743
2½ 2.469 2.875 5.793 30.077 .2487
3 3.068 3.500 7.575 19.479 .3840
3½ 3.548 4.000 9.109 14.565 .5136
4 4.026 4.500 10.790 11.312 .6613
4½ 4.560 5.000 12.538 9.030 .8284
5 5.047 5.563 14.617 7.198 1.0393
6 6.065 6.625 18.974 4.984 1.5008

Pre-Drilling Calculation - (Composite Joist)

Model Root
Diameter		 Hole Size
(inches)
GST 20 0.182 1/8
GST 25-380 0.280 7/32
SWG 20 0.182 1/8
SWG 25-380 0.280 7/32

 

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Last modified: August 26, 2008         -   An independent, non-profit content rating organization.

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