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Development and Application of PE Gas Pipe Systems for Use at Pressures Beyond 7 bar [PE]

Ewing, Greig

# 1992 Eindhoven

Operation of high density polyethylene (HDPE) pipes at 7 bar has been very successful in British Gas over the last few years. Using HDPE pipes at higher pressures requires a high level and correct balance of pipe properties of strength, stress crack and rapid crack propagation resistance. Raised levels of jointing integrity are also mandatory necessitating automatic systems, proven high performance and reliable in-field quality control built on well tried tech~iques

Please note that the whole article content is available on PPCA website only

Author(s) : Ian Aldridge, Declan Robinson, Dave Smart, Chris Reed, Martyn, Greig, Trevor Stafford, David Christie-Lowe, Alec Erskine 2016 Berlin

For the UK polyethylene (PE) gas pipe network, the first installations now exceed 40 years in the ground, with an original design life of 50 years. It was thus timely to review the current condition and performance history of these first generation PE materials. A major 4 year project was started in 2010 to examine...

A Novel Approach to PE Pipe Insertion Using Four-Lobe Vacuum Collapse

Author(s) : Ewing, Greig, Stafford 2006 Washington DC

Funded by a UK government “Smart” Award, the authors have researched, and partially developed, a novel concept for temporarily reducing the external diameter of a PE pipe and then allowing recovery to full diameter as a close fit within a host main. The novelty lies in the four-lobed collapsed pipe geometry, which...

PE-X - The Versatile High Performance Pressure Pipe System

Author(s) : Hoving, Palmlof, Harget, Upperton, Ewing 1995 Edinburgh

The performance properties of Cross Linked Polyethylene (PE-X) are reviewed with particular emphasis on extreme temperature operation. Resistance to rapid crack propagation at low temperatures and retention of properties at elevated temperatures are highlighted. The potential availability of a high strength (MRS 12.5)...

Rapid Crack Propagation in PE Gas Pipes

Author(s) : Greig 1995 Edinburgh

One of the main design criteria for limiting the operational pressures of polyethylene (PE) gas pipes is its resistance to rapid crack propagation (RCP). Below a critical pressure the crack arrests but above the whole pipeline may be fractured. The paper discusses the critical pressures measured during European and...

High Strength Oriented HDPE Pipes

Author(s) : Ward, Atkinson, Greig, Hansard 1992 Eindhoven

A novel die-drawing process has been developed at Leeds University. By incorporating a mandrel, pipes may be expanded hoopwise whilst being drawn axially. Such biaxially-oriented pipes have properties better suited to the transmission of gases and liquids than either isotropic or longitudinally-drawn pipes. In this...

Rapid Crack Propagation in Hydrostatically Pressurized 250 mm Polyethylene Pipe

Author(s) : Greig 1988 Bath

The catastrophic phenomenon of rapid crack propagation in 250 mm diameter polyethylene pipes has been investigated at a full scale test facility. Tests at +3°C were conducted with pipes, either completely fully of water or containing a small percentage of air. The safe, maximum pressures were measured. Rapid crack...

The Possibility of Assessing the Long Term Performance of PE Pipes Using a Quality Control Fatigue Test

Author(s) : Greig, Lawrence 1988 Bath

Hydrostatic s~ress rupture testing at 80°C of polyethylene gas pipe currently takes sver 1000 ho7.1rs to determine its good stress cracking performance. This is excessively long for quailty control purposes so a rapid rest is being developed using fatigue pressurlsac. :on, 2gajn on notched...

Fracture Arrest Conditions in Polyethylene (PE) Gas Pipes

Author(s) : Greig 1985 York

As polyethylene pipes increase in size above 250 mm, the avoidance of high-speed brittle fracture propagation becomes of overriding importance. More stringent operating and test pressures have had to be introduced. A full scale test programme on a variety of pipe sizes is being conducted by British Gas. In this paper,...

Fracture Propagation in Polyethylene (PE) Gas Pipes

Author(s) : Greig, Ewing 1982 York

Fracture propagation is a phenomenon in which a long brittle crack runs along the pipeline at high speeds of...