This standard describes nine pressure classifications of Type I and Type II
asbestos–cement pipe, 18 in. through 42 in. (450 mm through 1,050 mm) in
diameter, for underground installation to convey water in water supply service
systems.
1.1.1 Use. Asbestos–cement transmission pipe is to be used in pipe systems
having relatively predictable flows and few appurtenances, which permit reasonable
hydraulic analyses, including those for surge pressures.