Standard Cement Lining
Cement-mortar lining for ductile iron pipe and fittings for water service is in accordance with ANSI/AWWA C104/A21.4.
Cement-lined pipe is also furnished for some sewage service and a number of other applications. In fact, most pipe furnished is cement lined, providing improved flow characteristics and the required protection against tuberculation. The cement lining is satisfactory for temperatures up to 212° F. If standard asphaltic coating is furnished, the lining is only adequate for temperatures up to 150° F. For other services consult AMERICAN regarding temperature limitations of cement lining.
The first recorded installation of cement-lined gray iron pipe was in 1922 at Charleston, S.C. This lining was developed by the Charleston Commission of Public Works in cooperation with American Cast Iron Pipe Company. Since this beginning, AMERICAN and the entire iron pipe industry have furnished most pipe with cement lining. The lining is applied centrifugally with the speed of rotation designed to produce a smooth waterway surface, while retaining enough moisture for proper curing. AMERICAN cement-lined pipe and fittings are listed by ANSI/NSF Standard 61 for potable water contact.
Flow tests on cement-lined pipe under varying service conditions have established that the Hazen-Williams flow coefficient remains as expected at about 140, and flow tests on cement-lined, large-diameter AMERICAN ductile iron pipe have confirmed flow coefficients much higher than 140.