MACHINERY | PIPE INSPECTION
Round Robin test to boost pipe standards
PE100+, the association that repre- sents producers of PE100 resin, recently organised a Round Robin Test (RRT) on the hydrostatic pressure test according to ISO 1167-1/2 (20°C, Hoop Stress 12.4MPa) with help of its technical administrator, Kiwa. Compared to other RRTs per- formed on the ISO1167 standard, this one shows slightly smaller variations in reproducibility and repeatability,
said the association. No laboratories in the RRT that were classified as statistical outliers. In addition to the statistical
evaluation of the pressure test results, a deeper investigation was also carried out. This was a questionnaire on the impact of the water quality, sample preparation, equipment used and experience of the lab.
samples in the laboratory. Conventional contact measuring equipment – such as calipers, microm- eters and dial gauges – rely heavily on the skill of the person making the measurement. Different handling of the tools may result in significant variations in results. The new device can measure tubular samples in a contactless way. Using ultrasonic technology, dimensions such as wall thickness, inside diameter and outside diameter are measured instantly. In addition, ovality and eccentricity can be determined. An inserted sample is measured immediately at
Below: Zumbach says that its GaugePro measures tubular
samples in a contactless way, using ultrasonics
four fixed measuring points. Due to the rotation function, the measurement can be extended to eight measuring points. This increases the cover- age around the product and all variations in wall thickness become visible. Automatic self-calibra- tion ensures that the measured values are accu- rately and reliably recorded even under changing environmental conditions. All measured values are displayed on a large user interface. Several measured tube samples can
“The questionnaire showed that not all the labs followed the ISO standard precisely,” said PE100+. “There is certainly room for a further improvement of the reproducibility of the hydrostatic pressure test results between laboratories.” The RRT results will be used by
standardisations committees to further improve the pipe standards, said the association.
be summarised in a common statistic. Logging the measurement results is thus fast, easy and reliable. Two variants are currently available: GaugePro 8 covers a diameter range from 2.5 to 8mm, while GaugePro 22 can measure tube samples from 6.8 to 22mm.
Weld quality GF Piping Systems has developed an inspection device, called the WBI Tool, which assesses the integrity of infrared welds for both Progef (PP) and Sygef (PVDF) pipe. Using infrared butt fusion to join plastic piping components produces a weld bead. Historically, experienced welders or quality control managers have assessed the quality of the bead by eye, to see whether it is perfectly fused and uniform. The WBI Tool can do this job as well as a qualified worker, says GFPS. The device is the size of a computer mouse and contains photo-sensory technology. Welds for demanding applications can be digitally inspected to ensure potential weaknesses are highlighted – which helps to reduce the risk of leakage. “The WBI Tool can fit up to 15 different pipe diameters and analyse 4-16 different points of a weld,” said Peter Waefler, product manager for jointing technology at GFPS. “It can assess a weld bead and provide a seal of approval quickly and objectively.”
It comes in two sizes to check the connections of pipes in a range of sizes from d20 up to d225. The accompanying software allows examination of six different key areas of a weld: K-value, wall offset, width, area, heights, and angle. At the same time, it provides a pass/fail certification for each weld.
Quality control Sikora supplies a number of measuring and control devices for quality control during the extrusion of
16 PIPE & PROFILE EXTRUSION | October 2020
www.pipeandprofile.com
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