V4 12 Stormwater Maintenance Manual

WATS es TECHNICAL NOTE HDPE Pipe Repair Options ERS ae aan ee ae TN 5.03 January 2010 Introduction High-density polyethylene (HDPE) pipe is lightweight and very easy to handle. The attributes that make the pipe easy to use can also make it easy to abuse, resulting in damaged pipe or joints. This technical bulletin discusses some of the products available that can be used to repair damaged HDPE pipe or joints in the field. Repair Options One of the primary considerations in selecting a repair method is the degree of joint performance required. Watertight repairs are generally used on pipe with watertight joints, and soil-tight repairs on pipe with soil-tight joints. This helps keep costs in line and prevents the repair from being the weak area of the pipe system. The way in which a pipe can be accessed is another primary consideration which influences what type of repair alternative is selected. Pipe that is not yet buried, or can be easily excavated, can be repaired from the exterior. If the pipe is buried and cannot be conveniently excavated, an internal repair may be the best alternative. If the pipe is too ‘small to enter, there are companies with remote controlled equipment that can install the product. Each situation must be considered individually. The repair options addressed below are divided into external repairs and internal repairs. During any pipe repair, backfill should be placed and compacted per project specifications to provide proper support for the pipe and coupler. External Mechanical Repairs Mar Mac Polyseal Pipe Coupler, 4- through 60-inch (100 - 1500 mm), consists of a mastic adhesive base layer, a cross-laminated polyethylene middle layer with a spun-bonded geotextile polypropylene cloth outer layer. The coupler incorporates a self-adhering rubberized bonding mastic and securing bands to insure a positive seal around the pipe. . If the pipe itself is damaged, the damaged area will need to be removed and a new pipe section spliced in-before installing a coupler around both ends. Polyseal Pipe Couplers are reasonably priced, especially when considering the quality of the finished repair, and are typically used with soil-tight smooth interior corrugated HDPE pipe products. Note: Mar-Mac bands shall be installed in accordance with manufacturer's recommendations. ao Snap couplers, 4- through 8-inch (100 — 200 mm), and split

t smooth interior corrugated HDPE pipe products. Note: Mar-Mac bands shall be installed in accordance with manufacturer's recommendations. ao Snap couplers, 4- through 8-inch (100 — 200 mm), and split band (] couplers, 10- through 30-inch (250 — 750 mm), will provide a soil- tight repair with or without gaskets. This repair method should only be used if the damaged area is in a non-trafficked green area, is cosmetic in nature, confined to a single corrugation, and is not defined as structural damage. The coupler shall be centered around the damaged area of pipe and tightened down with the bad pele nylon straps. If the damaged area is large or significant, the Seu BAND damaged area is to be cut out, and replaced with a new section of pipe. The replacement section is to be ‘spliced’ in place using snap or split band couplers. They are a convenient, low-cost tepair alternative, and are typically used to repair soil-tight smooth interior corrugated HDPE pipe products. 4640 TRUEMAN BLVD. HILLIARD, OH 43026 (800) 821-6710 www.ads-pipe.com 41