Inside Manhole Drops Replace Failed Outside Drops

The Town of Saugus, Mass., has begun the process of installing cured-in-place pipe (CIPP) liners in its sewers and service connections, and rehabilitating manholes to reduce inflow and infiltration (I&I) and extend the service life of its infrastructure. Many of the manholes in the system were originally installed with outside drops, which are difficult to access for inspection, cleaning and maintenance. National Water Main Cleaning Company of Canton, Mass., has been contracted by Saugus and other municipalities to fill in outside drops and install new inside drops by RELINER Duran Inc.

The RELINER system is easy to install and allows the drop to be cleaned and inspected from above.

The company has established a procedure whereby the base of the outside drop is plugged with concrete prior to being filled with pea stone, flowable fill or sand. A hydraulic cement cap is placed on top and worked to be smooth with the mainline pipe invert. The mainline pipe is then CIPP lined, followed by rehabilitation of the manhole. After the installation of a cementitious liner in the manhole, the Inside Drop System is installed. The RELINER Duran system consists of a fiberglass Drop Bowl that is bolted to the manhole wall just beneath the high-level inflow pipe and stainless-steel pipe support brackets are used to attach the drop pipe to the wall. A flexible coupler is used to connect the drop pipe to the Drop Bowl, and a bend is installed at the pipe base in the manhole invert. The system is easy to install and allows the drop to be cleaned and inspected from above. It can accommodate internal drops ranging from 4” to 24” in diameter. WW

RELINER Duran Inc. is a Connecticut-based manufacturer dedicated to providing simple, cost-effective, durable products for use in the wastewater and construction industries. To learn more, visit https://reliner.com.