Plastic Pipes Conference Association # 2004 Milan
Gibson, Frost, Stratfold
This paper discusses the possibilities offered by ramp pressure loading tests to generate data for determining the long term load-bearing characteristics of plastics pipe systems. In addition to ramp pressure loading, procedures are also considered where the pressure is held at a constant value for a period of time, after which the product is subjected to a ramped pressure burst test. The method discussed relies on the material in question obeying Miner’s law in its static fatigue behaviour. The pipe system to which the procedure has been applied is Reinforced Thermoplastic Pipe (RTP), in which the reinforcement is aramid fibre. However the results are expected to apply to any polymeric system where there is evidence of conformity to Miner’s law. A set of ramp loading tests, and constant pressure plus burst tests are reported and compared with the results of conventional ‘constant pressure’ stress rupture tests and a method is proposed for converting these results into ‘equivalent’ constant pressure values. The results obtained on RTP using this new approach lie close to those generated using constant pressure.
Author(s) : Frost, Gibson
This paper describes the activities of the Joint Industry Project on Implementation of Reinforced Thermoplastic Pipe in the Oil and Gas Industries. The aim of the JIP is to promote applications of this new class of product in the transport of oilfield fluids, in gas transmission and in subsea flowlines.
Author(s) : Gibson, Wu, Frost, Korsunsky
This paper considers the collapse of liners confined within rigid pipes and recommends design equations top avoid this effect. Two and three-dimensional aspects of the problem are examined. The onset of unstable collapse is well-described by the critical pressure predicted from analytical models and is essentially an...
Author(s) : Gibson
This paper discusses the fabrication and properties of continuous fibre reinforced thermoplastic pipe systems. Such products can be manufactured by various winding processes involving reinforcing fibres or prepreg tape and have the potential to form the basis of a new range of high added value pipe products.