ENERGY MANAGEMENT


equipment replacement projects often pre-select equipment supply packages. By identifying the major equipment items (typically diesel generators, medium voltage/low voltage switchgear, controls platforms, power transformers and so on) that will be used in the project, a preliminary set of engineered drawings and specifications can be produced and distributed to equipment vendors. This gives the facilities group direct input into equipment selection by evaluating submissions using a pre-determined scoring procedure that evaluates technical merits, experience and price. Technical merits and experience are


often given a 60-70 per cent weighting when compared to price; the single driving factor if equipment procurement is left to the installation contractor in a competitively tendered project. The pre- selection process also mitigates risk by identifying the actual cost of a major portion of the scope of a project before the final design is completed and allows for the deletion of optional features if budgetary issues arise. Once an equipment package is


awarded, Sunnybrook will issue a letter of commitment, instructing the vendors to proceed with shop drawings, while further project design is completed and an installation contractor is selected. By committing to about five per cent of the equipment price (should the project not proceed), the early preparation and review of equipment shop drawings can save six to 10 weeks in a project schedule as this work is being completed alongside the final design drawings and specifications.


A number of additional project


considerations are taken into account to mitigate risk and ensure success when proceeding with engineered drawings and specifications for installation and construction. Detailed site survey work should be completed to ascertain exact conditions and site constraints. Administrative requirements for submittals, document control, scheduling and contractual terms and conditions need to be adequately identified.


The existing outdoor electrical substation and incoming utility service at the Bayview campus.


A process for managing service


interruptions, shut downs and requirements for work plans should be outlined to ensure that bidders are made aware of operational constraints. Requirements for off-site testing, commissioning and final functional verification are important to maintain quality control throughout the project. Applying for building permits and regulatory approvals can ensure that any mandated design revisions are incorporated prior to tender. Budgetary estimates should be updated as a design nears its final stages and consideration should be given to having optional pricing as a means for removing scope if the tender comes in over budget. Finally, a decision on whether to have


a general contractor or an electrical contractor act as the prime contractor should be evaluated. While general contractors provide value for projects that involve a larger building addition or redevelopment, using a general contractor for a project with a large equipment and electrical component and minimal building redevelopment may increase mark-up costs and anticipated tender results. An experienced electrical contractor can assume the role of the prime contractor and manage sub-trades for projects accordingly. A pre-qualification process can be used to select contractors with acceptable levels of experience, capacity and financial status to participate in a competitively bid project.


Infrastructure renewal Over the past six years, Sunnybrook has undertaken several major electrical infrastructure renewal projects following the methodology previously discussed. The entire medium voltage standby generating plant was replaced at the Bayview campus by constructing a new generating plant in the existing footprint. Generation capacity was increased from 4.3 MW to 8 MW (at 4160 V), response times were greatly improved and operational savings were included.1,2 The main switchboard that receives


incoming service feeds from an electrical utility was replaced at the Holland Centre over the course of one 20-hour shutdown on 26 December (Boxing Day – a low service use period). Three separate service crews from a switchgear supplier completely replaced dated switches, enclosure panelling and modified busbar during the shutdown. A capital project to redevelop the orthopaedic operating rooms is underway at the Holland Centre. As part of this project, the facility’s main emergency power distribution system has been upgraded and new diesel generators have been installed in a rooftop, pre-fabricated enclosure. The installation has doubled standby generation capacity and included new automatic transfer switches as well as general distribution upgrades. A project to redevelop the main


outdoor substation at the Bayview campus is also underway and is in the procurement phase. The project involves completely upgrading Sunnybrook’s main incoming utility service and outdoor substation, while keeping the campus fully operational. Substation transformer capacity will be increased from 20 MVA to 30 MVA, new 36 kV gas insulated switchgear (GIS) will be utilised complete with automatic transfer functionality between incoming utility circuits, and a multitude of TCP/IP network based monitoring and control features are being implemented. At the time of writing this article, equipment pre-selection for the substation project has been completed and competitive bids are being solicited


The prefabricated enclosure for two diesel generators on a lower rooftop at the Holland Centre. IFHE DIGEST 2018 77


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