Simulation of Pigging with a Brake Unit in Hilly Gas Pipeline
Publish place: Journal of Applied Fluid Mechanics، Vol: 12، Issue: 5
Publish Year: 1398
Type: Journal paper
Language: English
View: 197
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Document National Code:
JR_JAFM-12-5_013
Index date: 5 January 2022
Simulation of Pigging with a Brake Unit in Hilly Gas Pipeline abstract
Pigging is a routine operation in the oil and gas industry. In this paper, the governing equation of pig speed was combined with the gas flow equations. The transient equations of gas flow are solved by the method of characteristics (MOC). An experiment was carried out to test the proposed pigging model. The measured speed of the pig coincides with the calculated speed well. The process of a pig carrying a brake unit to pass over a hilly gas pipeline is simulated. The results indicate that the brake unit would lead to a sharp increase of the pressure on the tail of the pig, because the pig is dragged by the brake unit and thus prevented to accelerate together with the gas column in a downhill gas pipeline. This way, the pig speed in a downhill gas pipeline is much lower by using a brake unit, but the speed of pig still can hardly be controlled in the desired range. Furthermore, response surface methodology (RSM) is used to study the maximum speed of pig with/without a brake unit in downhill gas pipeline. Based on the results of the RSM simulations, two equations are present to predict the maximum speed of a pig in a downhill gas pipeline.
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