New Procedures for the In Situ Repair of Surface Defects in Plastic Gas Distribution Pipes [PE]
Mamoun, Grigory, Mallow, Bucza
# 1992 Eindhoven
In current practice. even relatively benign damage to plastic ipes can
require the complete replacement of the damaged section. T is costly
process can be performed more efficiently with a n in situ patch repair
procedure that uses a newly synthesized repair material. This material
has mechanical properties comparable to conventional PE, but with a
higher melt flow index. The use of this material allows patches to be
joined to unscraped pipe that will infiltrate sharp nicks and crevices,
thus retarding the possibility of long-term failure by slow crack growth.
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Author(s) : Grigory, Kim, Kanninen, O'Donoghue, Mamo
The perceived need to ensure that
polyethylene gas distribution pipes are safe from
the possibility of long running catastrophic
cracks has prompted a significant level of research recently. This paper brings to a completion an ongoing effort by the authors and their
colleagues over the last few years. The...
Measurements of temperature,
power input, and pressure of the molten PE at
the pipe-coupling interface in 4-, 6-, and 8-inch
(1 14-, 168- and 219-rnm)' electrofusion (EF)
couplings were made using instrumented
experiments during the fusion cycle. The high
temperature properties of several medium and
Most current procedures for the design, installation and qualification of
electrofused jointsin polyethylene gas piping systems are empirical in nature.
To improve this situation, the Gas Research Institute initiated an integrated
experimental and analysis research program at the Southwest Research
A brief overview is presented on some important research programs on plastic pipes conducted within the last ten years. Several signif icant research results and their impact on manufacturers and users of plastic pipes are high1 ighted. Results of research and development (R&D) on material characterization, in-service...