AWWA C221-12 Fabricated Steel Mechanical Slip-Type Expansion Joints (PDF)
SKU: STC_0076223-PDF
This standard describes fabricated steel mechanical slip-type expansion joints having packing chambers for use on pipe with plain, flanged, grooved, or shouldered ends in nominal pipe sizes from 3 in. through 144 in. (75 mm through 3,600 mm). The joints shall be manufactured from steel and are intended for use in systems conveying water. Mechanical expansion joints are not intended for use in buried conditions.
Description
The major changes made to the standard in this edition include the following: the definitions for actual outside diameter, body, expansion joint, rated pressure and transient pressure have been revised for consistency with other steel pipe documents; corrected the D/Ty limit in Sec. 4.2.2.1, Slip pipe, and Sec. 4.2.2.2 Body; clarified the functional requirements for bolts with respect to sealing mechanisms in Sec. 4.2.2.5, Bolting; old Sec. 4.3.2.4 on weld reinforcement thickness was deleted; information regarding the installation of an expansion joint based on temperature was deleted from Sec. 4.2.3.3, Expansion joint movement, and added and expanded on in Sec. 4.5, Installation Instructions; and, additional guidance on nondestructive testing (NDT) was added to Sec. 5.3.3, Production weld testing.