Experimental study on dynamics of rotatable bypass-valve in speed control pig in gas pipeline

Zhu, Xiaomin; Zhang, Shimin; Tan, Gui-Bin; Wang, Deguo; Wang, Wenming

doi:10.1016/j.measurement.2013.08.060

Cited by 55 publications

(16 citation statements)

References 9 publications

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“…Fluid is pumped upstream of the pig to drive the pig in motion. Due to the compressibility of natural gas, the speed of pigs in natural gas pipelines can be erratic [4][5][6]. At present, there seems to be no effective measures to control the speed of conventional pigs for cleaning operations [4,7,8].…”

Section: Introductionmentioning

confidence: 99%

Speed Simulation of Pig Restarting from Stoppage in Gas Pipeline

Zheng

2019

Mathematical Problems in Engineering

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Pigging is a common operation in the oil and gas industry. Because of the compressibility of the gas, starting up a pipeline inspection gauge (pig) from a stoppage can generate a very high speed of the pig, which is dangerous to the pipe and the pig itself. Understanding the maximum speed a pig achieves in the restarting process would contribute to pig design and safe pigging. This paper presents the modeling of a pig restarting from a stoppage in gas pipeline. In the model, the transient equations of gas flow are solved by method of characteristics (MOC). Runge-Kutta method is used for solving the pig speed equation. The process of a pig restarting from a stoppage in a horizontal gas pipe is simulated. The results indicate that the maximum speed a pig achieves from a stoppage is primarily determined by the pressure of the pipe and the pressure change caused by the obstructions. Furthermore, response surface methodology (RSM) is used to study the maximum speed of pig. An empirical formula is present to predict the maximum speed of a pig restarting from a stoppage in gas pipeline.

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Section: Introductionmentioning

confidence: 99%

Speed Simulation of Pig Restarting from Stoppage in Gas Pipeline

Zheng

2019

Mathematical Problems in Engineering

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“…Because of the compressibility of natural gas, the speed of pigs in natural gas pipelines can be erratic (Mirshamsi and Rafeeyan, 2012;Zhu et al, 2014). In gas pipelines, there are occasions that the pig speed is much faster than the allowable value, which is dangerous for the pipe and the pig itself (Zhang et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Simulation of Pigging with a Brake Unit in Hilly Gas Pipeline

Zheng

2019

JAFM

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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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“…Pipelines function as blood vessels to bring such necessities as oil and natural gas, and they are considered to be the most favoured mode of transportation of gas and liquid in large quantities (Kishawy and Gabbar, 2010;Tolmasquim et al, 2008;Xiaoxiao Zhu et al, 2014;Esmaeilzadeh et al, 2009;Nguyen et al, 2001a, b). With the long timelines employed, the problem of pipeline ageing is becoming more and more serious, and pipelines aging greatly promotes defects.…”

Section: Introductionmentioning

confidence: 99%