10 02/18 INSULATE FIELD JOINTS: After successful testing of carrier pipe joints, the welded joints should be insulated using the insulation kits supplied by Thermal Pipe Systems, Inc. 1. Weld pipe 2. Apply field joint half shell First weld carrier pipes together. Then attach field joint half shells. Next sand the circumferential and horizontal joints. Apply FRP wrap first to the two horizontal joints and then to the two circumferential joints. The field applied FRP wrap should extend 3” on each side of joint. After FRP wrap is cured and hardened apply wraparound heat-shrinkable sleeve on field joint. Detailed field joint procedures are to be supplied by Thermal Pipe Systems, Inc. 3. Close joint 4. Apply FRP wrap and shrink sleeve TESTING OF FIELD JOINTS: All field joints are to be air tested at 5 psi for 2 hours before backfilling commences. 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 bedding material and pipe, place backfill as follows: Place initial backfill by hand to a depth of 12 inches over the top of the pipe or casing. 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