CompositesWorld
Issue link: https://cw.epubxp.com/i/546021
CompositesWorld.com 53 NEWS N E W S N S N E W S E N W S W Subsea Pipe Liner by independent laboratories but also to third-party inspection, Walters says. Synchronized vertical production APS InField Liners are produced in a multi-stage patented and proprietary process that is executed throughout vertically rather than in the horizontal orientation typical of pultrusion, contin- uous flament winding and other linear composites fabrication processes (see Steps 1 & 2, p. 52), with all process phases carefully synchronized. "Te complete IFL is produced in a single process, with only the length being the defning factor as to when produc- tion should be started and stopped," Walters says. Te entire APS production system is computer-controlled to produce the stipu- lated weaving pattern, tube diameter and length to meet specifc 6 The liner is then pulled through the host pipe by a winching cable at about 10m/min. 7 When installation is complete, the liner is cut to length and air-infated until it expands to form a tight ft against the host pipe. End-termination connectors are then installed, and the pipe is hydro-tested for 24 hours before the pipeline is recommissioned. 4 The liner is folded and taped as it is reeled onto a dedicated installation drum, which is transported to the ofshore site with other installation equipment and personnel. 5 After the host pipeline and the riser pipe are prepared, the liner is guided into the riser. liner design requirements. Te control system is a proprietary software package specifcally designed for this function. "Every element of the fully automated manufacturing procedure is carefully and continuously monitored and controlled with real- time computer assessment and feedback so as to ensure absolute operational precision," Walters emphasizes. "Every facet of the liner production quality assurance is recorded, and the produced liner quality is, thereafter, further verifed by extensive testing prior to factory acceptance and certifcation." Production begins with the liner's aramid core cylinder (Step 1, p. 52). Te Kevlar aramid is woven in the tubular shape without a mandrel, in a manner similar to knitting a sock, says Walters. Instead of the circular needles often used for knitting socks, the patented weaving system uses an automated circular wheel.