Page 231 - Buried Pipe Design

Design of Pressure Pipes 205

TABLE 4.5 Selected ASTM Specifications for PVC, PE, and ABS Pipe
Hydrostatic design basis, Hydrostatic design stress,
Material type lb/in 2 lb/in 2
PVC ASTM D 2241
PVC 1120 4000 2000
PVC 1220 4000 2000
PVC 2120 4000 2000
PVC 2216 3200 1600
PVC 2112 2500 1250
PVC 2110 2000 1000
Polyethylene ASTM D 2239
PE 2306 1260 630
PE 3306 1260 630
PE 3406 1260 630
PE 2305 1000 500
PE 1404 800 400
ABS ASTM D 1527
ABS 1208 1600 800
ABS 1210 2000 1000
ABS 1316 3200 1600
ABS 2112 2500 1250

Third and fourth numbers (20) represent the hydrostatic design
2
stress, in this case 2000 lb/in divided by 100, and decimals that result
are dropped.
The design basis for PVC pressure pipe meeting ASTM D 2241 is a
balance of forces (Fig. 4.7). The pressure P times the mean diameter
D t equals the stress times twice the wall thickness t; or it can be
expressed as follows:

P (D t) 2t

t

P
P (D – t) = 2F = 2st
or s = P(D – t)/2t
F F
D

Figure 4.7 Stress due to internal pressure.