Level indicator system or relief valve for cement storage silo
8 Level indicator system or relief valve for cement storage silo
A level indicator system for a cement storage silo must include —
an audible alarm which sounds if cement stored in the silo reaches —
0.6 m below the inlet to the silo’s air cleaning system; or
2 tonnes less than the silo’s maximum capacity;
and
a test circuit which indicates whether the level indicator and alarm are working correctly.
Where a level indicator is used to comply with regulation 6(2)(b) the operator must ensure that the test circuit is activated before a load of cement is unloaded into the silo and that no cement is unloaded into the silo if the level indicator or alarm are not working correctly.
A relief valve for a cement storage silo must be designed —
to automatically prevent the level of cement in the silo rising above the level referred to in subregulation (1)(a)(i) or (ii); and
so that any excess cement is piped into a weigh hopper or to an outlet which is within one metre of the ground.
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