Correlations for estimating natural gas leakage from above-ground and buried urban distribution pipelines

Ebrahimi‐Moghadam, Amir; Farzaneh–Gord, Mahmood; Deymi–Dashtebayaz, Mahdi

doi:10.1016/j.jngse.2016.06.062

Cited by 85 publications

(18 citation statements)

References 31 publications

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“…The flow-through porous media is implanted with a general equation based on pipe flow by including the porosity effect in continuity and momentum. Forchheimer equation is also adopted (into Equation 12) in order to take account non-linear results from both viscous and inert effects at the external body force term [21], [22]; 0…”

Section: ( ) ( )mentioning

confidence: 99%

Modelling Flow Behavior of Gas Leakage from Buried Pipelineu

Ndalila¹,

Li²,

Liu³

2020

EJERS

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Risks in gas transportation are usually comprised of losses of the valuable gas, fire, explosion, and destruction to the environment. The safety of this infrastructure especially flammable gas pipelines is of great importance due to potential associated risks when leakage happens. An accurate understanding of the dispersion characteristics of the leaked gas from the underground pipe is of great importance. A gas leaking model from the buried pipeline was established based on computational fluid dynamics (CFD) technique, to simulate the situation. At the incidence of leakage, gas will propagate out and cause changes in flow behavior, which will prompt the detectors. The leakage position influences significantly much on the strength of leak signals to be detected at the ground surface. Under the simulation process, the double leakage pipeline model was involved. The variation of flow parameters inside the pipeline, outside pipeline, and the effect of leakage position were depicted and analyzed.

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Section: ( ) ( )mentioning

confidence: 99%

Modelling Flow Behavior of Gas Leakage from Buried Pipelineu

Ndalila¹,

Li²,

Liu³

2020

EJERS

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“…Odumabo et al 8 and Yan et al 9 used CFD and experimental tools to study the hindrance of underground gas pipeline leakage to gas flow in low permeability sandstone and the diffusion of methane in soil. Ebrahimi-Moghadam et al 10 built a two-dimensional, turbulent, and compressible gas flow model. The correlation method is used to estimate the amount of natural gas leakage from overground and underground urban gas pipelines.…”

Section: Introductionmentioning

confidence: 99%

Study on the influence of elbow with different curvature radii on pipeline leak location

Lin

Lei

Jiang

2021

Advances in Mechanical Engineering

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Experimental and numerical methods are used to locate the pipeline leakage in the present work. The weak compressibility of the fluid is taken into account when simulating the propagation of negative pressure wave (NPW) in the pipeline. The NPW attenuation coefficient is used to describe the influences of curvature radius on location accuracy. The results indicate that when the curvature radius is small, the location accuracy of pipeline leakage is low. When the radius of curvature increases or the inlet pressure increases, the accuracy of pipeline leak location is improved. Besides, with the change of inlet pressure, pressure, and velocity distributions in the elbow with different curvature radii are investigated. When the curvature radius of the elbow is three to four times of pipe diameter, the measurement accuracy of leakage location is the best. When the inlet pressure of the pipeline is 0.7 MPa, the sensitivity of the pipeline detection is the highest. The cavitation corrosion at the elbow is the most obvious. Therefore, the elbow is the area where pipeline leakage occurs most frequently.

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“…[21], in which they determine that most of the leak noise is contained in frequencies lower than 100Hz. One study does examine the relationships between leak diameter, gas pressure and leak flow rate [22] but no study has yet focused on the relationship between gas leak noise and these basic leak parameters; nor have any studies examined the subsequent wave propagation in the surrounding soil.…”

Section: Introductionmentioning

confidence: 99%

Gas pipeline leak noise measurements using optical fibre distributed acoustic sensing

Muggleton

Hunt²,

Rustighi

et al. 2020

Journal of Natural Gas Science and Engineering

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Leakage from pipes is a major issue in both the oil and gas sectors, not only in environmental and economic terms, because of wasting important natural resources, but importantly from a safety perspective. Optical fibre technology offers the possibility of continuous acoustic monitoring of pipelines and remote detection of leaks. In this paper we present results from gas leak measurements made on a specially designed, buried pipeline test rig, for which leak energy radiated directly from the leak (orifice noise) dominates over energy radiated from the pipe wall. Measurements of the orifice noise are made using an optical fibre distributed acoustic sensing system as well as conventional geophones. Both the geophones and the optical fibres are shown to be able to detect the orifice noise, particularly when the fibres were located close to the pipeline. Fibre measurements are found to be limited by both high background noise and by gauge length, which limited the upper frequency limit for accurately determining the phase of the ground response. The measurements indicate that the orifice noise sets up Rayleigh waves in the ground, largely contained in frequencies below 100Hz, the magnitude of which are found to be compatible with predictions from idealised jet theory.The effect of fibre ducting and armouring is also evaluated.

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Correlations for estimating natural gas leakage from above-ground and buried urban distribution pipelines

Cited by 85 publications

References 31 publications

Modelling Flow Behavior of Gas Leakage from Buried Pipelineu

Modelling Flow Behavior of Gas Leakage from Buried Pipelineu

Study on the influence of elbow with different curvature radii on pipeline leak location

Gas pipeline leak noise measurements using optical fibre distributed acoustic sensing

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