Record any on-site supply redundancies that can provide energy or water if the primary supply is disrupted (e.g., a diesel generator backing up utility electric power). For each redundancy, note its start-up time, estimated runtime given the loads it supports and any stored or otherwise available resources, system reliability, and whether it is configured for automatic start in response to a disruption. If two components operate in sequence (e.g., an uninterruptible power supply and a generator), enter them as a single supply redundancy (e.g., “UPS + generator”). Use the TRN Toolkit's runtime calculators if you do not already know the estimated runtime.
For intermittently delivered supply types, such as fuel oil and propane, only the portion of fuel stored onsite that remains at the time of scheduled or threshold-based deliveries should be considered as a supply redundancy (i.e., the minimum supply on-hand). For these supply types, only the estimated runtime associated with that remaining fuel is required; the reliability and start-up-related questions are not applicable.
| 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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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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