Reasons for water accumulation in naphtha pipelines and frosting in fuel gas pipelines
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When we operate the naphtha pump here, water can accumulate in the inlet and outlet pipelines of the pump; the same thing can happen sometimes with the LPG storage tanks. There is a leak in the control valve for the torch fuel gas, and as a result the pipelines also frost up constantly. Please provide an explanation{:1_90:}
When liquid material is vaporized or when there is a rapid pressure reduction at high pressures, heat is absorbed due to volatilization or gas expansion, causing the temperature around the pipes to drop sharply. When this temperature reaches the dew point, moisture in the surrounding air will condense on the pipe walls, resulting in dew formation – what is commonly referred to as \"sweating\". If the pipe temperature drops below freezing point, frost or ice will form.
This post was last edited by hnan on 2016-3-19 08:17. Frosting on LPG tanks is possible, as mentioned above, but it seems unlikely for naphtha to experience such a phenomenon.
When the control valve has internal leakage, as LNG passes through and the internal leakage is reduced, the temperature drops and heat is absorbed, causing condensation on the pipe walls and resulting in dew formation； The LNG temperature can be increased or the LNG composition can be changed ； Alternatively, adjust the pressure after LPG depressurization appropriately, so that the pressure does not drop too much.