North Middleton Township, Cumberland County, PA


Borough of Carlisle


Design of back-up generator system that would be tied into the plant SCADA system.


Design, bidding and construction phase services for a standby diesel generating facility

Protecting Carlisle’s Water Treatment Plant

ARRO was selected to design a 750 kW generator for back-up operation of the Borough’s entire water treatment plant.

First, the  generator had to be elevated on a platform specifically designed to support the generator, sub-base diesel fuel tank and sound-attenuating walk-in enclosure above the flood way.  The option for locating the generator on an elevated structure met the joint requirements of DEP and the Army Corp. of Engineers.  Since flood waters could cover the area below the generator, it was crucial that all fluids associated with the generator be contained. To this end, the fuel tank was double-walled with a tank leak alarm installed between the tank walls.  This offered double assurance for notification of leak and containment thereof. 

Second, the entire floor of the walk-in enclosure had to be completely sealed and constructed large enough to hold the full contents of the engine oil and engine radiator water/anti-freeze solution in order to contain liquids that would be detrimental to the water supply, if a leak would occur.

And third, ARRO used mineral-insulated cable between the generator and the newly designed automatic transfer switch located several hundred feet away. Since the cable doesn’t require conduit, it was more easily bent in order to conform to the routing requirements and space constraints. While allowing greater flexibility to route on the roof and within the building.

The elevated structure was built using steel columns as the piers for supporting the steel and concrete platform.  The platform was provided with two means of access for the sake of safety and convenience, and the entire walk-in enclosure, engine/generator and fuel tank were installed as one entity by crane.


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ARRO Consulting, Inc.
(717) 569-7021    108 W. Airport Road    Lititz, PA 17543