What type of pump should be used for unloading naphtha?
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Our company is about to store a batch of naphtha (with a density of 0.7), using the truck-to-ship transfer method. What type of pump would be suitable for unloading the naphtha? The warehouse currently uses shielded pumps and twin-screw pumps
It’s not good to use a twin-screw pump for pumping naphtha, right?
You can try an arc gear pump! It’s relatively safer, but it’s noisy!
Economical type: Centrifugal pump; Safe type: Enclosed pump
Our facility has just built a naphtha unloading platform, using self-priming pumps
It is best to use a rotary pump for bilging, as it is difficult to remove the remaining oil.
If the on-site loading and unloading area has already been constructed, it is necessary to consider the relative height of the pump installation location with respect to the lowest liquid level in the tank truck, in order to simply calculate the net positive suction head. If the installation height is insufficient, it is recommended to use a high-flow centrifugal pump in combination with a low-flow positive displacement pump, if possible. The advantages of this approach are fast unloading, thorough removal of residual oil, no impact on the equipment itself, high unloading efficiency, and reduced electricity costs. The disadvantage is that it is complex to operate and requires a high initial investment. It is also possible to use large-capacity volume pumps for direct unloading; compared to this approach, the alternative solution involves a lower initial investment, faster unloading, and simpler operation. However, the pump outlet cannot withstand pressure buildup, resulting in low pump efficiency and higher electricity costs. Regulating the flow rate using a bypass line will further reduce pump efficiency, and it is not possible to operate at low flow rates for an extended period of time. If the installation height is no problem, then a single centrifugal pump will suffice; for extra safety, a bag pump can also be used.