9 02/18 BEDDING: Bedding material should be sand or other materials free of sharp objects, heavy clods, boulders or frozen lumps as specified by the Design Engineer. The approved bedding should be used 6" under, around, and over the pipe. Utilize good practices that apply to buried pressure piping. ASSEMBLY OF CASING-TITE SLEEVE: Prior to installing the next section of pipe, the Casing-Tite Sleeve should be installed onto this piece. Simply position the sleeve over the casing and slide it all the way on by hand. WELDING: End covers should remain in place until welding operations are ready to begin. Welding in trenches should be minimized. System sections including fittings and loops should be laid out first and aligned. Welding procedures shall be in accordance with contract specifications, ANSI B31.1, and good welding practices. TESTING: All carrier pipe welds shall be tested in accordance with the contract specifications. If no test is specified, test should consist of a hydrostatic test of 150 psi or 1½ times working pressure, which ever is greater, for a period of two hours. INSULATION OF JOINTS: After completion of testing, attach preformed polyurethane insulation onto the joint using 32-gauge stainless steel straps. Push Casing-Tite sleeve over the insulated joint so that it is positioned evenly. CLOSURE OF JOINTS: Apply the factory supplied Casing-Tite seal circumferentially around the seam between the sleeve and the casing pipe. Overlap seal 3 inches. BACKFILLING: Backfilling of trenches shall progress as rapidly as construction, testing, and acceptance of work permits. Uniformly compact and grade bottom of trenches. After installation of pipe and bedding material, backfill as follows: place initial backfill in layers to a depth of 12 inches over the top of the initial bedding. Compact the material to a density equivalent to the surrounding undisturbed soil or to 90 percent of maximum density (ASTM D1557, Method D), whichever is greater. Backfill remainder of trench in one-foot lifts and compact to 90 percent maximum density (ASTM D1557, Method D). For trenches excavated in roads, streets, or located under structures, place backfill in 6-inch layers to top of trench and compact each layer to at least 95 percent maximum density (ASTM D1557, Method D).