Harmonisation of polyethylene pipe buttfusion procedures and test methods [PE]

Author(s) : S H Beech, P Belloir, C Salles

Plastics piping systems are specified against a relevant standard, giving dimensions, essential performance requirements, the design basis for pressure rating, and testing to prove fitness for purpose, giving the end user the confidence to use these systems. The plastics pipes industry has successfully developed...

Author(s) : Stephen Beech, Christophe Salles, Ulrich Schulte

Polyethlyene, Pipes, Buttfusion, Joining, Testing Several well established procedures are used for butt fusion welding of PE pipes globally. The most widely used are the European Single Pressure, UK Dual Pressure, and the USA High Pressure procedures. In the future it may be possible to rationalise these procedures....

Author(s) : Beech, Clutton

Design of pipe systems for lifetimes in excess of 100 years depends on accelerated testing of pipe at different temperatures, and standard extrapolation methods for assessment of the minimum required strength. However resistance to slow crack growth is an essential parameter to take into account for the development of...

Author(s) : Beech, Ferguson, Clutton

Design of pipe systems for 50 year lifetimes depends on accelerated testing of pipe at different temperatures and standard extrapolation methods for assessment of whether the minimum required strength is achieved. Further acceleration is used in the notched pipe test (NPT), which is a medium term (up to 1000 hour)...

Author(s) : Beech, Ducan, Millar

Polyethylene has been used for pipeline applications for nearly 50 years now. It has become the prime material choice for gas and water distribution systems and many other applications worldwide. This paper reviews the growth in the market for polyethylene pipe products for both pressure and non pressure applications...

Author(s) : Allcard, Beech

It is widely accepted that in testing, the long term fracture mode for Electrofusion (EF) socket fittings is via Slow Crack Growth (SCG), initiating from the first wire turn from the centre cold zone of the fitting. This study examines the injection moulding process and the EF welding process and their potential to...

Author(s) : Beech

Pressure pipeline systems are a critical application for materials and demand high levels of performance and reliability. It is not by chance that plastics pipeline systems have gained a considerable market share, particularly in the gas and water utilities supply system. This paper briefly reviews the key properties...

Author(s) : Beech

Pressure pipeline systems are a critical application for materials and demand high levels of performance and reliability. Resistance to slow crack growth is a key consideration for both metals and polymers alike, which must be dealt with by the appropriate material selection, product design and manufacturing control....

Author(s) : Beech, Headford, Hunt, Sandilands

The guldeUnes g h n in BS CP 312 :Pwt 2 : 1973 w e recommended to the UK toater industryfor the deslgn of polyethylene pfpeline systems to toke inin account the effects of tmnsient [surge) pressurejluctuatlons with respect to fatigue (ref.1). These guIdelInes we based on earlier experience wlth PVC-Usewer h i n g...

Author(s) : Pittman, Whitman, Gwynn, Beech

Comprehensive operating data from a large-scale pipe cooling lime are reported, including in-situ measurements of temperatures within the pipe wall. A finite element simulation of cooling, coupled with gravity induced flow, or slump, in the pipe wall is described. Computed temperatures within the wall are compared...

Author(s) : Beech, Allwood

The basis for the evaluation of polyethylene materials for pressure pipe applications is hydrostatic stress rupture testing for the prediction of long term hoop strength.However it is crucially important that the fracture properties of the materials are understood and indeed may result in limitations of their use....

Author(s) : Beech, Burley, Bunn

Production of plastics pipes by conventional extrusion results in 'frozen i n r stress in the pipe wall, termed residual stress. Techniques have been established for assessina the levels of ~, this stress and relating to extrusion coaling conditions by mathematical modelling. However, the effects on long term...

Author(s) : Beech, Hutten, Ritz