Silverwing is now part of Eddyfi Technologies

SCORPION2 Remote Access Ultrasonic Crawler

  • Up To 150 mm/sec inspection speed
  • Fully integrated auto UT B-scan crawler
  • Dry-coupled wheel probe
  • Battery Operated

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.

Ultrasonic Tank Shell Inspection
Tank Shell Thickness reading using UT crawler
Dry Coupled Ultrasonic Wheel Probe
Key Features:
  • Up to 125 mm/sec programmable mode
  • Up to 150 mm/sec manual mode
  • Active steer for auto-correcting straight line driving
  • Drive over 12 mm step even in damp conditions
  • Dry contact probe - no couplant required
  • Programmable scan length and pattern
  • Inspect within 25 mm of weldments (HAZ)
  • Manual joystick control
  • 4 Permanent magnetic drive wheels
  • Battery powered for easy use
  • Part of the UTLite2 ultrasonic family
  • 3 component system, Scorpion2, UTLite2 and umbilical

Probe Design

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).

Dry Coupled Wheel Probe

Battery Powered

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.

Battery Powered UT Crawler

Active Steer

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.

Dual Encoders

Drive Wheels

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.

Magnetic Drive Wheels

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.

EEMUA tank shell inspection

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.

Technical Specification

L 463 mm (17.9”) x W 272 mm (10.5”) x H 117 mm (4.4”)
Crawler weight
8.8 Kg (19.4 lb) including battery
Umbilical cable length
50 metres (164 feet)
Umbilical weight
4.25 Kg (9.4 lb)
4 x Neodymium iron boron magnetic wheels
Active Steer 4 wheel independent 12V DC motor drive
Drive wheels
Treaded rubber compound
Max programmable inspection speed
125 mm/sec (5”/sec)
Max manual inspection speed
150 mm/sec (6”/sec)
Maximum step weld
12 mm (0.45”)
5Mhz Dual Element Dry Couple
Near surface resolution
2.5 mm (0.1”)
Probe normalisation
Self-normalising probe
Power supply
14.4V, 6.2Ah, rechargeable smart Lithium ion battery pack. 2.5 hours continuous operation from fully charged
Battery charger
Dual bay – auto ranging 100 - 240VAC - 2.5 hours fast charge from flat. Two batteries supplied as standard
Software (UT Lite only)
Data Views
A-scan, profile B-scan, amplitude B-scan
Thickness, x distance, amplitude, through paint
Waveform mode
RF & full rectification, smoothing
Data export
Waveform to jpeg. Thickness readings with position to csv.
Dual gates, fully independent
Metric and imperial
Ultrasonic Specification
-400 Volt Spike
Receiver gain
0 – 80 dB in 1 dB steps
Wideband (0.5 – 2 MHz), 1.5 – 3.5 MHz, 3.5 – 7.0 MHz, 6.5 – 12 MHz
Sample rate
50 MHz
Transducer mode
Single or dual via software
Compatible devices
Scorpion2, R-Scan, ThetaScan
Scorpion2 guidance
Manual joystick for drive
Encoder – 25 way D type socket, UT – 2 x Lemo (Tx & Rx), Scorpion2 umbilical connector, USB port for data transfer
L 338 mm (13.3”) x W 245 mm (9.6”) x H 135 mm (5.3”)
4.8 Kg (10.6 lb)
Battery / charger
3 hours operation from fully charged/ 2.5 hours fast charge from flat. Swappable batteries. Two batteries supplied

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