Development of Protective Gas Pipes Sleeves for Operation in Permafrost Soils

Abstract

Experimental studies were carried out and causes of emergencies with gas pipes in protective sleeves used in construction of gas pipelines were identified. Protective sleeve design has been developed that excludes deformation or destruction of gas pipeline during groundwater freezing in the annulus. Model tests of polyethylene gas pipeline in steel casing, using polyethylene foam as an element that compensates expansion of water during freezing, showed complete exclusion of deformation of gas pipes during freezing. Test results of developed designs of protective casings showed the possibility of widespread use to improve reliability and safety of gas supply.

The Effect of Heavy-Duty Vehicle Crossings on the State of Stress of Buried Pipelines

“…In order to determine the through-wall bending stress σ b in the buried pipe in step I and step II loading, the respective pressure p V transmitted to the pipe is substituted into Equation ( 4) to obtain the pipe ovality ∆y/D, which is then substituted into Equation (5).…”

“…Because protective sleeves can protect gas pipelines from the heavy loads caused by vehicles and trains, they have become a subject of attention for pipeline safety authorities [3] and have found their place in international standards, e.g., [4]. Special protective sleeves can also be used in permafrost conditions [5]. Protecting the long-term integrity of gas pipelines through the use of protective sleeves at highway and railroad crossings not only minimizes the risk of pipeline ruptures but also reduces the risk of damage to roadways and nearby structures [6].…”

Study and Analysis on Stress Safety Judgment Method of Heavy Vehicle Rolling on Long-Distance Pipeline

“…The research methods are mainly divided into formula calculation method, experimental method, and numerical simulation method. Vilkys et al, Rusin et al, McDonough, and Ksenofontov divided the load of buried pipeline into fill load and surface traffic live load and calculated the vertical pressure of buried pipeline under the action of surface traffic live load by using Boussinesq point load method, Spangler method, distribution angle method, and Newmark integral superposition method based on Boussinesq equation [20][21][22][23]. However, several methods are not combined with the real feedback law of in-service pipeline.…”