They are used in many places and are familiar to many people. The following editor will introduce the air resistance problem of oil unloading crane pipes. Let's take a look.
At present, domestic railway light oil tank cars use the upper unloading process to unload oil products. The crane pipe siphon pipeline is usually under negative pressure. When the residual pressure at a certain point of the pipeline is less than the saturated vapor pressure at the operating temperature of the oil product , The oil will vaporize in a large amount, causing discontinuous flow or cut-off phenomenon, which is gas resistance. High temperature in summer or low-pressure areas on plateaus are prone to air resistance.
When the tanker trucks unload gasoline in high temperature seasons and plateau areas, the air resistance of the crane pipe often occurs, which causes the fuel in the lower part of the tanker to not be unloaded. Aiming at this problem, the mechanism of the air resistance of the crane tube was analyzed, and the method of checking the air resistance of the crane tube was proposed. Based on analysis and research, several new air resistance prevention measures have been proposed.
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