# 1982 York
The influence of the incorporation of injection moulded fittings and the presence of mirror plate butt welded joints on the performance of polyethylene pipe systems has been assessed. Systems have been tested at 79.5OC under, predominantly, internal fatigue pressure loading. Both fittings and butt welded joints have been shown to be sites for premature failure under fatigue loading. The fall off in system performance for some systems can be substantial.
Author(s) : J.Bowman 2010 Vancouver
Polyethylene (PE) resins are known to be sensitive to both sunlight and high ambient temperatures, such that excessive exposure can degrade the material. The inclusion of stabiliser packages into the polymer controls this potential for damage from outdoor aging. Reported in this paper are results on the stability and...
Author(s) : Christodoulou, Wilson, Hunter, Bowman 2006 Washington DC
Polyethylene (PE) based and metallic pipe systems have been assessed for their ability to stop petrol migrating through the pipe wall, fitting or joint and into water contained within the pipe. A quantitative test was devised that is capable of distinguishing between the different pipe systems. Plain PE pipe...
Author(s) : Wood, Richards, Street, Muckle, Bowman 2006 Washington DC
For the movement of fuel gas and water, plastics pipes are dominant in many markets, and this success has been based on single material solid wall pipes. There are now an expanding number of multi-layered plastics pipes, and described here for the first time is the performance of the second-generation of skinned...
Author(s) : Hunter, Christodoulou, Greaves, Bowman, Bott 2004 Milan
The development of a pipe system designed to transport potable water through contaminated ‘brown-field land’ is described. The system is based around a multi-layer, aluminium reinforced PE pipe, and includes a full range of specially designed mechanical fittings to provide the end user with a total system...
Author(s) : Stokes, Potter, Metcalfe, Bowman, Graham 2001 Munich
The response of three different forms of polyvinyl chloride (PVC) pipe has been explored when the pipes had attached to them ferrule straps. Pipes were subjected to fluctuating internal pressure (fatigue) loading at 20°C, and the lifetimes, location of any failures and the types of failures recorded. Tests were...
Author(s) : Allan, Hashemi, Faulkner, Bevis 1998 Gothenburg
A novel moulding process has been developed at the Wolfson Centre for Materials Processing, Bmnel University, for the production of curvilinear forms of thermoplastic materials. The process has been used with a gas pipe grade of medium density polyethylene to manufacture right-angled elbows of 63mm diameter SDR 11...
Author(s) : Bowman 1995 Edinburgh
The many technologies associated with the production, installation and uses of plastics pipes systems increase in their sophistication and diversity This paper selects and reviews changes that have and are taking place with polyvinyl chloride (PVC) and polyethylene (PE) pressure pipe systems designed for canying...
Author(s) : Cartwright, Troughton, Hinchcliff, Bowman, Jenkins 1995 Edinburgh
For the butt fusion joining of PE80 polyethylene pipes on site, long heat soak and cooling times predominate in the United Kingdom and other countries. The literature is reviewed to propose that these heat soak and cooling times can be significantly reduced via the use of machines with verifiable, reduced short...
Author(s) : Bowman,Medhurst, Portas 1992 Eindhoven
For two sample shapes different procedures have been examined as methods to quickly and quantitatively assess the strength of electrofusion joints. It is shown that the peel test, specified in BS7336, can be added to in order to obtain a quantitative measure of joint strength either using the % ductility on the...
Author(s) : Bowman 1992 Eindhoven
The influence of time and temperature on the long term strength of a multilayer pressure pipe has been investigated. The pipe consists of five layers, one of which is an aluminium foil while the other four layers are polyethylene based and form the significant ( > 8 5 % ) part of the pipe wall. In respect of...
