This standard describes shop-applied, cement-mortar linings specified in the ANSI/AWWA C100/A21 series of standards for ductile-iron pipe and ductile-iron and gray-iron fittings for water and is intended to be used as a supplement to those standards. Major revisions made to the standard in this edition include the following: the format has been changed to current AWWA standard style; and, Section 4.7 on thickness of lining and Section 4.8 on determination of thickness were revised to delete the requirement that the thickness shall be determined while the mortar is wet.