(57) A fire sprinkler system comprising at least one sprinkler; break tank means (8; 107),
for receiving water from a mains water supply; pump means (11, 12, 13; 109) for supplying
water from said break tank means to said at least one sprinkler; means (70; 117) for
providing water to said at least one sprinkler from said mains water supply other
than by way of said break tank means, and including check valve means (71; 118) for
preventing reverse flow of water to said mains water supply; and pressure detection
means (20, 21, 22) operable to detect pressure of water supplied to the or one or
more of said at least one sprinkler, and operable to cause said pump means to be operated
when said pressure is below a predetermined value.
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