From the oil storage tank to the pump: after the pump is started, is there positive pressure or negative pressure in the pipeline between the oil storage tank and the pump?
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From the oil storage tank to the pump: once the pump is started, is there positive pressure or negative pressure in the pipeline between the oil storage tank and the pump? I’d appreciate advice from those who know more about this
Whether the pipeline between the oil storage tank and the pump is under positive pressure or negative pressure depends on whether you are filling the tank with oil or draining oil from it; the pipeline is under positive pressure when filling, and under negative pressure when draining