We are currently specifying a VFD pump for unloading LNG from a Road Tanker. The Pump capacity is approx. 100 gpm with differential head of approx. 10 bar, Pump rpm ~ 6500 rpm and discharges to a vertical LNG Storage Vessel.
The operating Pressure of LNG Road Tankers would vary depending on the distance covered and BOG generated due to heat leak plus other variables. Similarly, the operating pressure of the LNG Storage Pressure Vessel (MAWP of 18 barg), would also vary depending on top/bottom loading of LNG to vessel and the operating condition.
Can we specify a centrifugal pump for this service instead of a VFD Pump?
Generally, the VFD Pump is costlier and we have got vendor offers only for VFD Pumps based on enquiry for above specifications mentioned for Pump.