284 moleswokth’s pocket-book
Cast Ikon Watek Pipes.
To bear a pressure of 200 feet of water or proof of 400 feet.
Bore Thickness Depth Thickness! Space Weight
in of of of for of 9-feet
Inches. Metal. Socket. Socket. Packing. Length.* Joint.
inches. inches. inches. inches. cwt. qrs. lbs. lbs.
3 A 3 5 8 i 0 3 24 2'4
4 To 3 5 8 i 1 1 14 3-6
5 3 8 3f 5. 3. 1 2 16 6-0
6 a. 8 3f 5 8 3 2 0 0 8’2
1 JL 8 34 5 8 f 2 1 4 8-7
8 7 16 3t 5 3 3 0 4 9-9
9 16 4 4 3 1 19 13-9
10 * 4 f 3 4 1 16 14-9
11 i 4 4 A 4 2 22 15-9
12 9 18 4 t 5 2 24 17-2
14 5. 8 4 3. 8 7 2 4 20-8
The 9-feet length is taken from the eud of one pipe to the end of the
next when laid.
Cast-iron Pipes-—Pressube in.
Let H = Head of water in feet.
P — Pressure of water in lbs. per square inch.
d = Internal diameter of pipe in inches.
t — Thickness of metal in inches.
P = 0-433 H.
t = 0-000054 Hd + x.
ort — -000125 P.d + x.
x = -31 ius. for pipes less than 12 ins. diam.
.= ’5 for pipes from 12 to 30 inches.
= "6 for pipes from 30 to 50 ius. diameter.
Rule fok finding the Weight of Cast-iron Pipes.
D = Diameter outside in inches.
d = Diameter inside, or bore in inches.
W = Weight of 1 yard of pipe in lbs.
W = 7-35 (D2-d2).
The weight of two flanges = about 1 foot of pipe.