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Products RS CityMain

RS CityMain


RS CityMain™ is an eco-friendly, high performing epoxy-based composite CIPP solution for the rehabilitation of sewer force mains and other pressure pipe ranging in diameter from 6 to 48 inches. This styrene-free trenchless solution structurally renews deteriorated pipe, stops leaks and eliminates corrosion at a fraction of the cost of traditional dig and replace methods. The RS CityMain system from HammerHead® Trenchless meets the highest quality control standards and will restore flow and integrity to deteriorated pressure pipes.



RS CityMain features environmentally-friendly epoxy resin that is Styrene-free, HAP-free and VOC-free. It is a fully structural Class IV pressure pipe liner used for the renewal of 6- to 48-inch (150 to 1220mm) diameter pressure pipes.

Application Range

RS CityMain can be used with all host pipe materials and is designed to survive a sudden failure of the host pipe. It seals leaking joints and hole corrosion, and it prevents further corrosion and encrustation. RS City Main handles joint deflections up to 10% and bends up to 45° with ease, and is installed in average lengths of 300 to 500 feet.


The host pipe is cleaned to remove loose obstacles and provide a sufficient internal pipe surface to allow for optimum hydraulic performance of the lined pipe. Water jetting and mechanical cleaning devices are used for cleaning depending on the host pipe condition. Utilizing RS MobiPreg impregnation technology and installation processes exceeding the requirements of industry standard ASTM F2994, the liner is fully saturated with the approved epoxy resin while under vacuum. The wet-out liner then passes through computer controlled calibration rollers and prepared for installation into the host pipe. Installation is performed either by inversion or pull-in methods compliant with ASTM F1216 or ASTM F2019. Curing is performed using either controlled steam, normally after installation with pressure drum; or, hot water, normally after installation with hydrostatic water column.


Connections and joining techniques can be modified to suit the systems maintenance requirements with industry standard fittings. Service connections are made via open-cut excavation or robotic means.

Description Specification
Medium Municipal and industrial sewage
Diameter Range – in (mm) 6 – 48 (150 – 1220)
Thickness Range 3.0 – 15.0 mm depending on static calculation
Available Lengths Length made to order
Resin MaxPox® epoxy resin systems
Liner A multi-layered fiberglass reinforced needle-punched felt liner with an impermeable coating for conforming to ASTM F1216 for the rehabilitation and structural renewal of sewer force mains and other non-potable water pressure pipe.
RESIN IMPREGNATION (WET OUT) METHOD Vacuum saturation in compliance with ASTM F2994
Cure Methods Steam or hot water cure