Scorpion2 dry coupled remote access ultrasonic crawler system brings major inspection efficiency improvements to above ground ferro-magnetic structures such as storage tanks, vessels and offshore installations.
The all-in-one solution has been developed with feedback from Silverwing’s extensive Scorpion user base and support from industry leading robotics researchers at Strathclyde University.
Performance advantages include faster data collection, efficient scanning patterns, higher probability of detection and the ability to collect valuable measurements in critical locations enhancing RBI inspection programs.
The system has two operating modes and can record thickness measurements at a speed of up to 125 mm/sec in programmable mode and up to 150 mm/sec in manual mode, this brings a major inspection efficiently improvement which will translate into increased revenue for its users.
Silverwing’s unique “Dry Coupled” ultrasonic wheel probe eliminates the need for traditional couplant or a constant water supply. The wheel probe performs like a standard twin ultrasonic probe, and can measure material thickness from 5 mm to 100 mm, including through paint.
The probe is enclosed in a gimballed probe carriage allowing it to ride over protruding objects whilst keeping it perpendicular to the inspection surface. The carriage also allows the system to record thickness measurements within 25 mm of a weld cap to inspect the critical heat affected zone (HAZ).
The Scorpion2 system is supplied with four intelligent Li-ion batteries allowing for continuous on-site operation. (two for the Scorpion2 and two for the UTLite2). Each Scorpion2 battery can scan up to 700 metres from a full charge or the equivalent of 8 scans of a 40 metre high storage tank.
The Scorpion2 swappable battery is mounted on board the crawler removing the need for a separate battery pack on the ground thus reducing umbilical and overall system weight.
One of the challenges for crawlers is compensating for drift on high structures, especially in windy conditions where the umbilical can drag the unit offline. Active Steer solves this problem with the use of dual encoders to measure angle changes, then automatically corrects the scan path by controlling each of the four drive wheels independently.
Active Steer also allows for accurate positioning when turning the crawler through programmable angles making it easier and more efficient for the operator.
The Scorpion2 uses four independently powered magnetic drive wheels with treaded tyres for ultimate grip in damp conditions. The treaded tyres give the Scorpion2 the advantage of being able to easily drive over 12 mm steps with less slippage compared with other systems on the market.
EEMUA & API Recommendations
Traditional techniques of random tank shell thickness measurements can be very misleading due to the low Probability of Detection (POD) and may lead to incomplete corrosion rate calculations. As recommended by EEMUA, the Scorpion2 records thickness measurements along a vertical line even in the critical Heat Affected Zone (HAZ) meaning a higher POD resulting in a more accurate corrosion assessment.
EEMUA states that walking on tank roofs can be hazardous if the condition is not known. The condition and thickness of the roof plates should be confirmed before access is permitted. The Scorpion2 can remotely record thickness measurements reducing the need for roof access.
UT LITE2 Compatibility
The Scorpion2 works seamlessly with the UTLite2 ultrasonic data acquisition unit. Simply connect the Scorpion2 to the UTLite2 via the umbilical cable and you’re ready for your inspection.
The intuitive touch screen control software has been designed for the operator, large buttons and simple to use menus ensure easy crawler control and ultrasonic setup.
Data Capture Software
The Scorpion2 B-scan software features several powerful data review, reporting and printing tools. Saved data can be reviewed at any time with active A-scan and B-scan displays. Placing the cursor over any part of the B-scan profile shows the A-scan trace for that specific section of the scan.
An adjustable reporting threshold indicator can be displayed over the B-scan profile, this helps to identify reportable defects at a glance and allows rapid analysis of the complete scan. The full amplitude B-scan mode helps to characterise wall loss which in turn allows for a more detailed post-inspection analysis and accurate corrosion assessment.