When are orifice plates required to be installed with hydrant valves?

In high rise buildings, the pressure will vary at the different floors due to the difference in head at the different levels. This can result in vast difference in pressure from top of the building to the bottom. To ensure that the same standard pressure is available from hydrant valves at all levels, different size orifice plates are required to be fitted at the inlet of the hydrant valve. The orifice size will depend on the level of the hydrant and the running pressure required from the hydrant.

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