A rubber lining works only if it is continuous. A single pinhole lets the medium reach the steel wall, and corrosion or wear concentrates at that point until the pipe leaks — often within weeks on aggressive service.
Spark testing (holiday detection) passes a high-voltage probe over the whole lining surface. Any pinhole, thin spot or unbonded area produces a spark and is marked for repair before the spool leaves the workshop. It is the single most important quality check in lined pipe production, together with thickness and hardness measurement of the rubber layer and adhesion checks.
When comparing lined pipe quotations, ask not only the price per meter but also what testing is included — a spark-tested spool with records costs slightly more and is worth it. All Youwei lined spools are 100% spark-tested, with test records available to customers.
Spark testing (holiday detection) passes a high-voltage probe over the whole lining surface. Any pinhole, thin spot or unbonded area produces a spark and is marked for repair before the spool leaves the workshop. It is the single most important quality check in lined pipe production, together with thickness and hardness measurement of the rubber layer and adhesion checks.
When comparing lined pipe quotations, ask not only the price per meter but also what testing is included — a spark-tested spool with records costs slightly more and is worth it. All Youwei lined spools are 100% spark-tested, with test records available to customers.