Performing the inspection while the bolt is still in place eliminates time consuming un-mounting, Magnetic Particle Inspection and re-mounting of the bolts.
ultrasonic inspection (UT)
UT delivers better inspection quality (digital inspection data), detection of volumetric (subsurface) defects and improved characterization of flaws compared to conventional MPI.
Two rotating discs combined with inclined rollers give the flexible shaft / probe combination all degrees of freedom. The probe can move axially in and out, it can rotate or combine both on helicoid path.
HBS - Hollow Bolt Scanner
Elements under pressure, such as steam or gas turbine casings or valves are often fastened with dedicated bolts. These bolts always face high mechanical and often thermal stress as well. In order to inspect these critical parts – more precisely: their threads - they are typically unmounted and then inspected with magnetic particle inspection (MPI). One type of bolt is the so called hollow bolt: It has a central bore that allows for heating it up from the inside in order to bring it to its nominal tension based on heat expansion/shrinking. The re-mounting of the bolt is extremely time-consuming as it has to follow certain mounting order and the heating and cooling down takes a significant time. In order to eliminate this complicated mounting procedure Inspection Robotics has introduced the Hollow Bolt Scanner to inspect in-situ.
How it works
The central bore of the hollow bolts provide a perfect access to the interior of the bolts. With an optimized UT configuration it is possible to detect cracks typically starting at the thread root and discriminate them from exactly this thread root. An automated scanner feeds the probe(s) to the regions of interest and then perform a helical scan to cover the complete critical zone. As some of the bolts are located underneath the elbow of steam tubing, the system is small enough to fit into this constrained space.
The UT beam is directed to the zone of potential crack with a very shallow angle in order to maximize the signal ratio between cracks and geometrical echoes (thread root). A flexible shaft moves the probes both in axial as well as in circumferential direction. On one side the shaft is stiff enough to drive the probe with high precision. On the other side its flexibility allows it the bend away easily from obstacles such as tube elbows. The shaft is driven by a scanner drive attached to one side of the bolt. The motions is transmitted the flexible shaft by to parallel friction drives with inclined rollers , similar to an omni directional wheel (mechanum wheel).
- easy scan path setup
- small & lightweight
- integrated motor controllers
- stroke from 300mm up to 1500mm
- bores diameters from 12mm up to 25mm
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