What is the primary purpose of the lead-lag arrangement of the two potable water pumps supporting a typical potable water system?

Question

Accepted Answer

Enabling the lead pump to cycle on and off during periods of relatively low demand and the lag pump to assist the lead pump only when the demand is high.

Answer

Enabling the lag pump to cycle on and off during periods of relatively low demand and the lead pump to assist the lag pump only when the demand is high.

Answer

Enabling the lead pump to pump against a shut-off head during periods of relatively low demand and the lag pump to recirculate when the demand is high.

Answer

Enabling both potable water pumps to cycle on and off together in response to system demand changes.