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[Daekyung Tech] Pipering stiffness testerQuote inquiry_ CS@roasexpo.comIt is a pipe RING STIFFNESS testing machine.ISO 9969ISO 13953ISO 6259meets the standards ofTest Spec.Maximum pipe diameter: 4 metersTest time: 42 daysMaximum compressive load: 100 kNThis test predicts in advance what kind of change in the inner diameter of the pipe willoccur aft..