We installed the high-density polyethylene pipe liner in our hydrochloric acid transfer line about a month ago. The previous rubber lining had started showing signs of swelling after only six months, so we needed something that could handle continuous exposure at 80°C without degrading.
During the first week, we ran the system at full operating pressure — 12 bar — and monitored for any drop in flow or signs of permeability. The liner held steady. We also performed a thermal cycle test, bringing the line from ambient to 90°C and back down over eight hours. No cracking, no blistering, no measurable change in wall thickness.
What impressed me most was the dimensional stability. The extrusion tolerances were within 0.2 mm across the entire 12-meter section, which made installation straightforward. The joint sealing process was clean, and the multi-axial stress report that came with the liner gave me confidence that the material could handle the vibration from our pumps without developing micro-cracks.
After one month of continuous operation, I can say this liner performs exactly as specified. The zero-permeability claim is not marketing — we tested it with a helium leak detector and got no reading. For a chemical processing environment where a single leak means a shutdown, that kind of reliability is worth the investment.