Page 265 - Buried Pipe Design

Remarks 1961 1963

400 0.18 0.23 (initial) (2 weeks)

300 0.25 0.16 0.29 0.38
Pressure, lb/in 2 200 Rerounding coefficient R 0.47 0.45 0.44 0.60 0.43 @ 350 lb/in 2 0.39 @ 350 lb/in 2

100 0.98 0.89 0.67 0.90 R R

50 1.04 0.90 0.87 0.96

Cover depth, ft 12.8 8.0 6.6 11.5

Backfill Loose dry sand Native soil 90% Proctor Native soil

Pipe mat. FRP Ductile iron FRP

Rerounding Coefficient Pipe stiffness, lb/in 2 D 30.5 48 247.0 36 97.3 35

TABLE 4.12 /D Ref. 3.17 8 2.0 19 2.2 7

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