Avery-Hardoll bulkmeters can be used on all petroleum products of all viscosities. However there is obviously an increase in pressure drop with more viscous fuels which, under normal circumstances, will limit the maximum flow rate obtainable.
It is recommended that the pressure drop through a bulkmeter should not exceed 15 psi (one bar), above which the load on the bearings will start to cause wear. Consequently when using products with viscosities (at operating conditions) above 100 centistokes, it is necessary to reduce the maximum permitted flowrate. As a guide it is suggested that the pressure drop through the meter should not exceed 10 psi (0.7 bar) for continuous running at maximum speed or 15 psi (one bar) for continuous running at half speed.
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