2024 12 27 Maintenance Manual 1

Concrete collars also provide a soil-tight repair, dependent on the integrity of the installation. Installing a concrete collar involves building a form around the area to be repaired and encasing it in concrete. A geotextile is usually wrapped around the repair area prior to pouring the collar to keep the concrete from seeping into the pipe. Typically, approximately 6” (0.15m) is excavated beneath the pipe to allow for proper application of the geotextile aan ra GEOTEXTILE and concrete encasement. If the pipe itself is damaged, WRAP the damaged area shall be removed and a replacement pipe section spliced in prior to pouririg the collar. In order to provide a greater level of joint performance, a gasket can be installed on the pipe in the concrete encasement. Concrete collars are typically more costly and time consuming than snap couplers or split band couplers but are reasonable repair options for soil-tight smooth interior corrugated HDPE pipe products. . Slip Couplings 4- through 24-inch (100 - 600 mm), \ rarataraa4 provides a watertight repair that will meet most pressure testing requirements, when installed a correctly. The slip coupling uses PVC bells with eruniifis gaskets. The gaskets are placed in the valleys on J either side of the section to be repaired and slip SLIP COUPLING couplings are then slid over the gaskets, PVC slip couplings are most commonly used with watertight smooth interior corrugated HDPE pipe products. . Internal Repairs Internal mechanical repair products generally consist of a flexible cylindrical gasket sleeve, which is expanded to conform to the inner wall of the pipe. The feasibility of this repair method depends on the size of the damaged section or joint and available access into the pipe. Internal mechanical seals slightly restrict the inside diameter of the pipe. This should be considered when assessing the risk of debris obstruction. NPC Internal Joint Seal, 18- through 60-inch (450 — 1500 mm), consists of an EPDM rubber seal and stainless steel bands. The rubber seal is inserted into the pipe and positioned over the joint. A torque wrench is used to expand the bands against the inner wall of the pipe. The Internal Joint Seal is designed to seal joints — not repair damaged pipe sections. The damaged area of the pipe must be removed and a replacement section spliced in if necessary in order to use the Internal

al Joint Seal is designed to seal joints — not repair damaged pipe sections. The damaged area of the pipe must be removed and a replacement section spliced in if necessary in order to use the Internal Joint Seal. This system may provide a watertight joint when installed as recommended. The manufacture should be contacted to verify the product meets the specific application requirements including test requirements, if specified. If pressure tests are required, NPC should be contacted to ensure that the product is suitable for the specific test criteria. Internal mechanical seals will slightly restrict the inside diameter of the pipe. This should be considered when assessing the risk of debris obstruction. Link Pipe Grouting Sleeve™, 4 through 60 inch (100 — 1500 mm), is a stainless steel grouting sleeve that is installed with an inflatable plug. The sleeve may be used to seal a joint or repair short sections of damaged pipe. The manufacture should be contacted to verify the product meets the specific application requirements including test requirements, if specified. Internal chemical sealing is another method of internal joint repair using chemically activated gel or-grout to minimize joint leakage. The grout is typically applied with specialized remote-controlled equipment. Test/seal 4640 TRUEMAN BLVD. HILLIARD, OH 43026 (800) 821-6710 www.ads-pipe.com A ANG ann