English to Russian Tech/Engineering Engineering (general) пожарная защита

It shall be possible to close the foam concentrate discharge valve from control room or manually at the foam station itself upon the decision to change over from foam to water. This function is required for flushing the foam system downstream of foam station at the end of operation. If it is decided to shut off one or more of the users, the foam concentrate pump shall continue to run and the foam concentrate shall circulate into the foam concentrate vessel.

Не пойму, о каких юзерах идет речь.