Page 133 - Buried Pipe Design

Height of cover, ft
10 30 28 26 24 22 20 18 16 14 12 1.6 1.5 1.4 1.3 1.2 1.1 1.0 0.9 0.7 0.6 0.5 2.0 1.8 1.7 1.6 1.4 1.3 1.2 1.1 0.9 0.8 0.7 9.1 8.2 7.7 7.3 6.4 6.0 5.5 5.0 4.1 3.6 3.2 2.83 2.2 2.1 1.9 1.7 1.6 1.4 1.2 1.1 0.9 0.8 6.5 6.0 5.6 5.2 4
Long-Term Deflections of PVC (SDR 35) Pipe (Percent) *†
0.4 0.5 2.3 0.6 1.7 2.9 3.6 1.7 3.3 3.6
8
0.3 0.3 1.4 0.4 0.9 1.8 2.4 0.9 2.3 2.4
5 * Test data indicate no length of pipe installed under conditions specified will deflect more than is indicated; the pipe ‡ Embedment material classifications are per ASTM D 2321, Underground Installation of Flexible Thermoplastic

0.2 0.2 0.9 0.2 0.7 1.1 1.3 1.3 1.3
3 0.65 † Listed deflections are those caused by soil loading only and do not include initial out-of-roundness, etc.

Density (Proctor) AASHTO T-99, percent 90 80 90 85 75 65 85 75 65 will deflect less than the amount indicated if specified density is obtained. Data obtained from Utah State University report.

ASTM embedment material classifications ‡ Manufactured (class I) granular angular Clean sand (class II) Sand and gravel (class III) Silt and clay (class IV)

TABLE 3.9 and gravel with fines Sewer Pipe. SOURCE:

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