Estimating Liquid Pool Evaporation by Forced Convection in a Gas Pipeline

Alessandro Terenzi

Abstract


During the design of a gas transmission pipeline, it is sometimes required to evaluate the timing of a liquid pool evaporation by mass transfer to incoming gas stream.

Residual water pools could be present in the pipeline as a consequence of a liquid leakage through dewatering pigs during pre-commissioning; or both liquid water and hydrocarbons could be accumulated in pipeline dips as a result of operation with off-spec natural gas (wet or rich), with liquid drop out from the vapour phase due to fluid phase envelope crossing at pressure and temperature conditions of normal operation envelope.

Negative consequences of liquid accumulation could be slugging for the hydrocarbon case, or corrosion and hydrate formation for the free water case, hence liquid must be removed as soon as practicable.

This paper presents a new model that could be used to calculate the drying time and spatial evolution of a residual liquid pool in a gas pipeline removed by air or natural gas flow over it.

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Copyright (c) 2016 Journal of Pipeline Engineering