1998 Gothenburg : Smart Solutions for the Design of Rehabilitation with Plastics Pipes
Author(s) : Marshall, Morley, Pearson
The Water Industry in England and Wales has responsibility for an approximate length of 300,000km of water main, ~nuchof which was laid over 70 years ago using cast iron.Subsequently, asbestos cement, PVCu and cement lined ductile iron have been used. The old iron pipe systems that were installed in many of the...
1995 Edinburgh : Improvements in Electrofusion Welding in the UK Water Industry
Author(s) : Marshall, Hepburn, Netherwood
The adoption of polyethylene as a pipe material by both the gas and water indusmes has undoubtedly led to several sigruf~cant economic and operational advantages. The development of narrow trenching techniques and insertion refurbishment methods only became viable once a complete fusion jointed polyethylene system was...
1995 Edinburgh : The Crack Growth Resistance of PVC and PE
Author(s) : Marshall, Ingham, Brogden
When clients purchase plastics pressure pipes, they have frequently made that decision because they know that plastics do not corrode and they assume that if they do not exceed the pressure rating then a long lifetime should be assured. (Low cost has also been known to be a factor).
It is thus of concern for the...
1995 Edinburgh : The Development of a Mains Pressure Test for PE & PVC Pressure Pipes
Author(s) : Marshall, Birch, Morley
Many UK Water Companies are now using PE pipe systems because it 1s believed that use of an all-welded pipe will minimise the number of mechanical fittings employed and therefore will reduce potential sources of leakage. With pipes such as ductile iron and PVCu, which are joined in short lengths, it is often...
1988 Bath : The Abrasion Resistance of Polymers Used in Slurry Transport Systems
Author(s) : Lowe, Marshall
A Rotating Pipe Drum Test has been developed to assess the abrasion performance of plastics pipes to an extpnt where most test variables are understood. The procedure involves the rotation of relatively short pipe lcngths containing slurry on a conventional bail mlll. In the rest, the pipe surface repeatedly passes...
1985 York : Specifying High Toughness in PE Pressure Pipes
Author(s) : Marshall, Birch
It is proposed that present Specifications for PE Pressure pipes are essentially undemanding and tests do not simulate service conditions. Perfect pipes are assessed rather than pipes which have sustained handling and installation ‘damage’.Flaws and defects have caused many problems with other thermoplastics pipes and...
1985 York : The Abrasion Resistance of Polymers in Slurry Environments
Author(s) : Lowe, Marshall
A new test has been developed to evaluate the abrasion performance of different
pipe materials. The Rotating Pipe Test simulates sliding bed flow of a slurry and
gives quite excellent data reproducibility. The influence of sample geometry and
slurry changing frequency and particle size have been assessed. The effects...
1982 York : Criteria for High Toughness in UPVC Pressure Pipes
Author(s) : Birch, Marshall
The mechanics of failure of uPVC pipe materials have been investigated using fracture mechanics test methods to induce brittle failure. It has been found that brittle failure can be quantified and test procedures have been developed which are capable of being used as quality control methods for classifying pipe. High...
1974 Southampton : The Analysis of practical failures of plastic pipelines
Author(s) : Marshall, Williams
During the last ten years, it has often been predicted that plastics will be used in increasing quantities as true engineering materials, Whilst there has been an increased acceptance of GRP as a positive alternative to metals in many applications, the use of thermoplastics for major load bearing structures has been...