I am working on a fuel oil transfer piping system that will draw No. 2 fuel oil from a remote fuel storage tank to a steam boiler. The pump is a Positive Displacement type pump located in the boiler house. I have performed pressure drop calculation on the suction leg of the pump which shows the pump inlet pressure to be around 9 PSIA, which is acceptable per the pump vendor data. However, I am concerned about vapor lock of the pump on a hot day. Portions of the suction leg are exposed to the boiler house temperatures, which I estimate could hit 120 F. Does anyone know what the vaporization pressure is for No. 2 Fuel oil (diesel) at 120 F. I have not been able to find it in any of my references. If you have the data please let me know where you got it so I can reference it in my calc.
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