Project Description

Memphis VA Medical Center

Install Additional SCI Emergency Generator

Install Operating Room Isolated Power Systems

Memphis, TN

Project Details – Install Additional SCI Emergency Generator


In order to correct the deficiencies of their domestic hot water system, Lexington Medical Center, contracted with Harrell Design Group to provide contract documents that included how water is distributed and circulated, stored, heated and cooled, treated and monitored. The project scope of work also included recommendations and the design of system corrections to improve the facility’s legionella prevention program.

We coordinated all efforts of a floor-by-floor analysis with the Engineering staff to research and survey, verify the as-built drawings, analyze the existing conditions, and provide a list of dead legs and cross connections and their locations.

During the initial survey phase, it became apparent that no reliable as-built drawings existed for the building. During the investigate services phase of the project, HDG uncovered a number of unidentified plumbing dead legs and a lack of other measures now used for legionella prevention. The plumbing system design included modifications to these existing systems to comply with new legionella requirements.

Harrell Design Group retained a plumbing contractor who had extensive experience in the building to assist with an intensive survey of the entire building. HDG and our contractor spent two (2) months on site continuously documenting the existing hot and cold water distribution system. The survey process included cutting observation holes in shafts, chases, and other concealed spaces. A small video camera was used to verify the piping in these areas.

At the conclusion of the documentation phase, HDG prepared a list of deficiencies for all areas. Construction Documents were then created to include the identification of instances where dead legs of hot water lines which could foster the growth of Legionella bacteria exist, cross connections between hot and cold domestic water systems exist and other deficiencies in the domestic water systems exists which would require further investigation to resolve. These drawings also included the identification of critical control points in the building’s water distribution system(s), to show where measures can now be implemented to prevent the growth of legionella. The final documents included recommended corrections for all the identified deficiencies.


Project Cost: $492,000



Project Details – Install Operating Room Isolated Power Systems


Harrell Design Group, PC is working with the Memphis VA Medical Center to design and install isolated power systems in BW309 Ortho OR 7, BW317 Eye OR 8, CW303 Cysto OR 9, and BW312Aendo/Hybrid OR 10.

The existing operating rooms listed above are operational and in use. A standard 120/208V, Three-Phase Grounded Wye secondary electrical system was installed in each room. Each room contains two (2) 120/208V three-phase power panels (ORXA and ORXB), out of which is fed room receptacles, equipment, and Skytron boom lighting equipment, all dedicated for that room. The branch circuit wiring used in each of the four operating rooms is standard THHN or THWN copper. This project will replace the standard grounded electrical system with an N.E.C. required Ungrounded, Isolated electrical system – in each of the four operating rooms. The isolated power system shall be installed per NEC Articles 517.160 and 517.19 requirements.


Project Cost: $567,000