Record any on-site supply redundancies that can provide electricity, natural gas, or water in the event of a disruption to the primary supply of that resource (e.g., a diesel generator providing backup for utility electric power). Characterize each supply redundancy in terms of how long it takes to start-up, the total time it can run given the loads it supports and any stored or otherwise available resources, the reliability of the system, and whether the system is configured to start automatically in response to a disruption. If two supply redundancy components operate in sequence (e.g., an uninterruptable power supply and a generator), they should be entered as one supply redundancy (e.g., “UPS + generator”). Leverage the TRN Toolkit for runtime calculators if you do not already know the estimated runtime.
| Supply Redundancy
Supply redundancies are on-site systems (e.g., generators, water towers, islanded solar panels) capable of temporarily restoring the supply of energy or water resources to critical loads in the event that the primary supply is disrupted.
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Time to Initiate (hrs)
How long will it take to start the supply redundancy and restore the energy or water supply to the supported critical load(s) following a disruption to the primary supply?
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Estimated Run Time (hrs)
Estimate how long the supply redundancy can operate based on the system capacity (considering both on-site storage and any re-fueling agreements), efficiency, and the resource demands of the supported loads. The TRN Generator Runtime Calculator and Water Supply Runtime Calculator can be helpful tools for making these estimates.
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Supported Supply Type | Reliability Responses
What actions have been taken to increase the likelihood that the supply redundancy will operate successfully in the event of an outage to the primary energy or water supply?
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Start-Up Responses
For a supply redundancy to qualify for automatic start-up, it must start up without manual intervention and, based on testing, the site must have confidence that the supply redundancy will start up when needed. If any of these conditions aren’t met, the user should select “no”.
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hours
hours
Reliability
Is the equipment in the supply redundancy part of a preventive maintenance program?
Are written schedules and procedures in place and followed for the preventive maintenance and testing of the equipment?
Is there documentation of performance of preventive maintenance and testing, and documentation of observations associated with these activities?
Start-Up
Is the supply redundancy configured to automatically start upon disruption of the primary supply system?
For a supply redundancy to qualify as able to automatically start-up, the supply redundancy must be able to start up without manual intervention and, based on testing, the site must have confidence that it will start up when needed.
If manual start-up of the supply redundancy is required, is it supported by written, up-to-date procedures, and are these procedures trained upon with documentation of completion of the training?
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