Instrumentation
Hand tools for measuring welds on fatigue-sensitive pipes
T
wo hand tools for measuring Hi-Lo gaps in SCRs (Steel Catenary Risers) and other fatigue-sensitive
pipes are now available from Optical Metrology Services (OMS). The tools are easy to use and provide greater accuracy and repeatability than traditional Hi-Lo gap measuring methods. When welded, SCR
pipes are required to have a very small (typically less than 0.5mm) internal mismatch in geometry or Hi-Lo gap. In the past, a variety of inaccurate and poorly repeatable methods have been used to measure the Hi-Lo gap, which also normally require a two-step process. To solve these
inaccuracy problems, OMS has designed and manufactured two new hand tools – the Pipe Checker ‘open gap’ Hi-Lo tool and the Pipe Checker ‘closed gap’ Hi-Lo tool. These tools are highly accurate, repeatable and faster to use than traditional measuring methods. The tools use a digital gauge to measure the Hi-Lo mismatch in a single operation. The open gap tool is designed to measure the internal Hi-Lo of an open gap bevelled pipe joint. The closed gap tool is developed for use with automatically welded pipe. Both tools are part of a family of Pipe Checker devices from OMS that offer greater accuracy and repeatability to quality assurance in pipeline
welding. The Pipe Checker closed gap Hi-Lo tool is used to measure the Hi-Lo at the bottom of the J prepped pipes. The measurement is taken in one step that is both accurate and repeatable, avoiding any human errors. The use of standard digital gauges
means that the tool is simple to use and familiar to inspectors. The calibration/ verification stand enables the user to set and calibrate the tool before use and thereafter to check that the tool is still within calibration limits. The closed gap tool is available in two variants: magnetic and non-magnetic. With the magnetic version, adjustments and reading values can be carried out without holding the tool. Both devices come with an LED light, which ensures that operators can check that the blade tips are in contact with the bevel in the correct place. n
For more information,
www.omsmeasure.com
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