Critical systems must always be equipped with more than one bomba . The choice between installing one or more standby pumps depends on installation costs and
- How critical of the system operation - A water supply system for a hospital is more critical than a cold water cooling system for a home
- The delivery time and installation of a new pump
If two or more bombs are used, the operation between the pumps must be systematically alternated for an equal wear.
Alternatives for alternate pumps
Pumps can be systematically alternated by
- Manual alternation - where the operator selects the main pump and the sequence of lag pumps
- service alternation - where the main pump changes every time the pump or system is stopped
- timed alternation - where the main pump is triggered by a timer or clock
- Operating time equal - where the main pump is switched to reach the same operating time for each pump
Observation! Running an automatic system to equalize pump wear
- has the advantage of extending the time before repairs and reinvestments
- has the disadvantage that all pumps can wear out at the same time - reducing operating safety for the entire system
Source: https://www.engineeringtoolbox.com/alternating-pumps-d_667.html
