AWWA 7A.2-T: Tentative Standard Specifications for Lock-Bar Pipe (PDF)

These specifications cover the manufacture of lock-bar pipe intended for the conveyance of water that is made from steel plates rolled or formed to a circular cross section, having longitudinal edges planed and upset to a dovetail form which engages in the groove of an "H-shape" steel lock-bar to form the longitudinal joint of the pipe. After assembly of the plates and the lock-bars the latter are closed by cold pressing thus making a tight fit over the dovetail edges of the plates. Pipes are shop fabricated into sections having laying lengths of approximately 30 feet except where shorter lengths are required for closure, curves, changes in alignment or grade to meet special conditions. Circumferential field joints are single riveted unless otherwise specified. The 7A.1, 7A.2, 7A.3, 7A.5, 7A.6, and 7A.7 committee reports are tentative specifications and are published to solicit constructive criticism from the membership as a whole. Three reports (7A.5, 7A.6, 7A.7) have been prepared to provide protection for steel water pipe for both underground and surface requirements. However, it is recognized by this committee that in some waters and in some soils, protection to the inside and outside pipe surfaces is not necessary and this committee does not attempt to make mandatory the use of such protection or to evaluate the condition of its use. -The above paragraph is found on page 1 of the insert in the yellow covered publication, "For Use of 7A Committee Only." (reprinted from the Journal AWWA, Vol. 32, No. 1, January 1940)