MIL-HDBK-1005/9A
2.5.2.5
Pipe Diameter. No sewers in the collection system
(including laterals, interceptors, trunks, and mains) should be
less than 8 inches (203 mm) in diameter. Other building service
connections should be at least 6 inches (152 mm) in diameter.
2.5.2.6
Depth. Place sewers sufficiently deep to receive
wastewater from basements and to prevent freezing. Depths
greater than 15 feet (4.6 m) are usually uneconomical.
2.5.2.7
Layout. Do not lay trunk lines under buildings.
Consider maintenance in the system layout.
2.5.2.8
Structures and Appurtenances. See Table 4 for
applications and details of sewer structures.
2.5.2.9
Pipes. Guidelines for selection of sewer pipe
material are given in Table 5. Requirements for pipe are given
in NFGS-02530, Sanitary Sewerage, and in Tables 4 and 5.
2.5.2.10 Installation. Installation requirements are given in
NFGS-02530 or in Table 5.
a) Use WEF MOP FD-5 for criteria pertaining to
trenching, foundations, laying, pipe cover, and loads.
b) For design criteria in cold regions, refer to
Department of Army Corps of Engineers TM 5-852, Arctic and
Subarctic Construction.
c) Design sewer lines located aboveground on
structural supports in high wind areas to withstand expected
wind velocities (refer to MIL-HDBK-1002 series, Structural
Engineering).
2.5.3
Pumping. Use pumping only where a gravity system
cannot serve hydraulically or where cost analysis shows a
significant saving. Incorporate the following criteria for
industrial wastewater systems. Oily wastewater pumping is
discussed in Section 3.
27
Previous Page
