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Standard Laying Conditions

ANSI/AWWA C150/A21.50
ANSI/AWWA C151/A21.51

2 1 1 1 5A Ft Laying Conditions Print

Flat-bottom trench.1 Loose backfill. (Not recommended for 14" and larger pipe.)

2 1 1 1 5B Ft Laying Conditions Print

Flat-bottom trench.1 Backfill lightly consolidated to centerline of pipe.

2 1 1 1 5C Ft Laying Conditions Print

Pipe bedded in 4” minimum loose soil.2 Backfill lightly consolidated to top of pipe.

2 1 1 1 5D Ft Laying Conditions Print
Pipe bedded in sand, gravel or crushed stone to depth of 1/8 pipe diameter, 4” minimum. Backfill compacted to top of pipe. (Approximately 80% Standard Proctor, AASHTO T-99.)
2 1 1 1 5E Ft Laying Conditions Print

Pipe bedded to its centerline in compacted granular3 material, 4” minimum under pipe. Compacted granular or select material2 to top of pipe. (Approximately 90% Standard Proctor, AASHTO T-99.)

1 “Flat-bottom” is defined as undisturbed earth.

2 “Loose soil” or “select material” is defined as native soil excavated from the trench, free of rocks, foreign material and frozen earth.

3 Granular materials are defined per the AASHTO Soil Classification System (ASTMD3282) or the Unified Soil Classification System (ASTM D2487), with the exception that gravel bedding/backfill adjacent to the pipe is limited to 2" maximum particle size per ANSI/AWWA C600.

Mechanical Joint Pipe
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