Page 277 - Buried Pipe Design

248 Chapter Five

TABLE 5.1 Properties and Design Constants
6
Modulus of elasticity 3.0 10 lb/in 2
Tensile strength 3000–4000 lb/in 2
2
Shear strength 4000 lb/in across pipe axis
2
Modulus of rupture (MR) 5000–6000 lb/in (bending strength in crush)
Compressive strength 7000 lb/in 2
2
Thermal conductivity K 5.5 (Btu in)/(h °F ft ), 4 when perfectly dry
Thermal coefficient of expansion 4–5 10 6 in/(in/°F)
Specific heat 0.27 Btu/(lb °F) @ 212°F
Moisture coefficient of expansion 1.5–2.0 10 5 in/(in/% moisture change) (mois-
ture content is 6–7% for normal atmospheric
conditions and 15–20% for fully saturated
conditions)
Hazen-Williams coefficient C 140
Manning’s coefficient n 0.010

TABLE 5.2 Applicable National Standards
AWWA C400 Asbestos-cement distribution pipe, 4 in through 16 in
AWWA C401 Standard practice for the selection of asbestos-
cement distribution pipe
AWWA C402 Standard for asbestos-cement transmission pipe 18
in through 42 in
AWWA C403 Standard practice for the selection of asbestos-
cement transmission and feeder main pipe, sizes 18
in through 42 in
AWWA C603 Standard for installation of asbestos-cement water pipe
ASTM C 296 Asbestos-cement pressure pipe
ASTM C 428 Asbestos-cement nonpressure sewer pipe
ASTM C 460 Standard definitions of terms relating to asbestos-
cement and related products
ASTM C 500 Standard methods of testing asbestos-cement pipe
ASTM C 663 Asbestos-cement transmission pipes
ASTM D 1869 Specification for rubber rings for asbestos-cement
water pipe
Federal Specification Specification for pipe, asbestos-cement for under-
SS-P-351c water pressure
Bureau of Yards and Docks, U.S. Navy Civil Engineering Design Manual
Navdocks, DM-5 (includes asbestos-cement pressure pipe)
Canadian Standards Association
CSA B127.1 Components for use in AC drain, waste, and vent
(DWV) systems
CSA B122.2 Components for use in AC building sewer systems
CSA B127.11 Recommended practice for the installation of AC
DWV pipe and fittings

A Hazen-Williams coefficient of 140 and a Manning coefficient of
0.010 should be used for long-term design. AC pipe can be tapped for
water service. Also, various fittings are available for connections.
Field cutting for repairs and/or installation is possible. Appropriate
safety precautions should be followed to protect workers from