Page 346 - Facility Piping Systems Handbook for Industrial, Commercial, and Healthcare Facilities

SITE UTILITY SYSTEMS

Class IV-A Suitable only in dry trench conditions and when optimum placement and compaction control is maintained. Install and compact in 6-in maximum layers. Work in around pipe by hand to provide uniform support. Suitable as restricted above. Install and compact to a minimum of 6 in above pipe crown. Minimum density 95% Std. Proctor. ‡ Use hand tampers or imp

Recommendations for Installation and Use of Soils and Aggregates for Foundation, Backfill, and Embedment (Continued)

Suitable as restricted above. Install and compact in 6-in maximum layers. Work in around pipe by hand to provide uniform Suitable as restricted above. Install and compact to a minimum of 6 in above pipe Minimum density 90% Std. Proctor. ‡ Use hand tampers or vibratory compactors. Maintain moisture content near optimum to minimize compactive effort. Compact as requir

Class III support. crown.

Soil class (see Table 6.20) * Class II Suitable as restricted above. Install and compact in 6-in maximum layers. Work in around pipe by hand to provide uniform support. Suitable as restricted above. Install and compact to a minimum of 6 in above pipe crown. Minimum density 85% Std. Proctor. ‡ Use hand tampers or vibratory compactors. Compact as required by

Class IB Install and compact in 6-in maximum layers. Work in around pipe by hand to provide uniform support. Install and compact to a minimum of 6 in above pipe crown. Minimum density 85% Std. Proctor. ‡ Use hand tampers or vibratory compactors. Compact as required by the engineer. * Class IV-B (MH-CH) and Class V (OL, OH, PT) materials are unsuitable as

Suitable as restricted above. Install in 6-in maximum layers. Work in around pipe by hand to provide uniform Suitable as restricted above. Install to a minimum of 6 in above pipe crown. Place and work by hand to ensure all excavated voids and haunch areas are filled. For high densities use vibratory compactors. Compact as required by the engineer.

Class IA support. compactors maintain minimum clearances as required by the engineer. Source: Copyright ASTM. Reprinted with permission.

TABLE 6.21 Use Haunching Initial backfill Embedment compaction † Final backfill

6.68
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