Load redundancy is the duplication of load equipment so that an alternative can be used in case one fails or needs to be maintained. Redundancy is common in industrial plants where loads such as pumps, fans, compressors, etc need to operate continuously. In order for there to be minimal plant downtime, these loads are replicated to ensure some redundancy.
Most commonly, the use of duty and standby equipment ("A" and "B" loads) is used. In a scenario where the A/B loads are 100% redundant, the equipment can be referred to as "2 x 100%", meaning that there are 2 equipment items capable of delivering 100% output each.
Other examples of redundant (and semi-redundant) configurations:
- 2 x 50% - 2 equipment items capable of delivering 50% output each. If one fails, then output is reduced to 50%.
- 3 x 50% - 3 equipment items capable of delivering 50% output each. In this case, there is always one equipment item out of service / on standby
- 3 x 33% - 3 equipment items capable of delivering 33% output each. If one fails, then output is reduced to 66%.