Liquefied hydrocarbon pump

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Liquefied chloromethane, chloroethane. The saturated vapor pressures at 40°C are 8.7 kilograms and 2.6 kilograms respectively. How to select the pump inlet and outlet pressures? A head of 32 meters is sufficient; the pump is suitable for transferring chloromethane and chloroethane from the intermediate tank to the upper tank. Should the outlet pressure of the pump be determined based on the head or on the saturated vapor pressure? Is a balance tube needed between these two tanks? What is the impact of having balance pipes on the pump? Is it true that: with a balance tube, the pressure at the pump outlet only needs to be 3.2 kilograms; without it, it needs to be at least 8.7 kilograms. As for the pump inlet, the pressure remains 8.7 kilograms regardless of whether there is a balance tube or not. If there are any experts who are aware of this, I request your guidance!