Investigations on the chemical resistance of pipes from glass-fibre reinforced polyesters (GRP) –
results of two-year performance tests in the "Włocławek" Nitrogen Works
In the third paper in the series concerning the chemoresistant GRP pipes there were presented the results of investigations on the chemical resistance of pipe sections installed in some selected fragments of the manufacturing plant in the "Włocławek" Nitrogen Works. These results revealed a mediocre resistance of the Polish-made resins (ANE, D-20 E, C-20, Polimal 138) to the action of a majority of the corrosive media at elevated temperature (75% waste H2SO4, sodium hypochlorite, chlorine-containing condensate, catholyte); the resistance is satisfactory only in the case of brine. Thus, it is expedient at the moment to use imported polyester resins controlled and warranted by the manufacturers. Any newly developer chemoresistant Polish resins should be checked — before being introduced into commercial applications — not only in laboratory scale, but also in performance tests analogous to those described in the paper.
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