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SCORPION Remote Access Ultrasonic Crawler

  • Fully Integrated auto UT B-scan Crawler
  • Dry-coupled probe for ease of use
  • Significant cost benefit over scaffolding
  • 10 mm wide scan in 1 mm continuous steps

The Scorpion B-scan is a rugged remote access ultrasonic (UT) crawler designed for cost effective A and B-scan imaging on above ground ferro-magnetic structures such as storage tanks, vessels and offshore installations without the need for costly scaffolding or rope access associated with UT thickness gauging.

The Scorpion B-scan system continuously records thickness measurements as it moves over the inspection surface. The recorded thickness information is presented in the software as an A-scan trace, a digital thickness measurement and a B-scan profile. Unlike many crawlers, the Scorpion can be bought as a complete system, integrating ultrasonic pulser/receiver, data logging and motion control for easy set up and seamless operation. Scorpion offers considerable cost saving over manual inspection with rope acess or scaffolding, and significantly improves probability of detection.

Ultrasonic Tank Shell Inspection
Tank Shell Thickness reading using UT crawler
Dry Coupled Ultrasonic Wheel Probe
Key Features:
  • Complete UT crawler system
  • Full A-scan capture
  • High resolution B-scan image
  • Full recording of waveform up to 30 m distance
  • Simple profile, or full amplitude display
  • Battery powered for easy use
  • Permanently stored data for recall to assist with RLA & RBI trend forecasting
  • Field proven reliability
  • No couplant or paint removal required
  • Lower safety incident risk
  • Aid to reduce maintenance costs by minimising use of scaffolding

Dry Coupled Wheel Probe

The Scorpion B-Scan and DCP remote access crawlers use a unique “Dry Coupled” ultrasonic wheel probe eliminating the need for traditional couplant. This allows the crawler to travel vertically, horizontally or even inverted whilst still fully functional, and removes the need for constant water supply. The wheel probe performs like a standard twin ultrasonic transducer, and can measure thickness from 2.5 mm to over 100 mm, including through paint. In front of the wheel probe is a neodymium magnet which maintains constant probe pressure whilst travelling on the inspection surface.

UT Pulser / Receiver and Motion Control

The digital ultrasonic pulser/receiver has very low noise and is matched to the wheel probe for excellent response. Set up is very simple, and works like a standard flaw detector so UT technicians quickly become familiar with its operation. All controls such as gain, time base range, filtering and gate adjustments are on the same screen as the active A-scan display and the B-scan image. A joystick provides motion control, which incorporates a latching mode to avoid having to continually hold it on long runs. The Scorpion is calibrated to drive straight, but a nudge function gives fine adjustment to take account of side winds and umbilical drag. The Scorpion wheels are rubber coated, with magnets in the body for clamping to the surface. This method ensures secure travel with no damage to the test surface.

Scorpion B-Scan

Complete system with encoded, 5 MHz, dry coupled wheel probe, ultrasonic pulser/receiver, portable computer and acquisition software. Supplied with a 30 metre umbilical cable for access to the top of the highest storage tanks.

Scorpion B-scan remote UT crawler
SCORPION B-SCAN
Probe
5 MHz Dry Coupled
Umbilical
30 metre
Encoded
Yes

Scorpion DCP

5 MHz Dry Coupled wheel probe crawler compatible with most UT flaw detectors. 50 metre umbilical cable allows access to the furthest point of most structures. No distance encoding.

Scorpion DCP dry coupled UT crawler
SCORPION DCP
Probe
5 MHz Dry Coupled
Umbilical
50 metre
Encoded
No

Scorpion BP

Irrigated dual 5 MHz transducer fed from a pressurised stainless steel reservoir. Compatible with most ultrasonic systems. Supplied with a 30 metre umbilical cable with water feed allows access to the top of the highest storage tanks. No distance encoding.

Scorpion BP Irrigated UT crawler
SCORPION BP
Probe
5 MHz Irrigated
Umbilical
30 metre
Encoded
No

Reporting Tools

The Scorpion B-scan software features several powerful data review, reporting and printing tools. Saved data can be replayed 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 to provide detailed post-inspection analysis. An adjustable reporting threshold indicator can be displayed over the B-scan profile, to identify reportable defects at a glance and allow rapid analysis of the complete scan. The full amplitude B-scan mode helps to characterise wall loss, eg pitting, erosion and delamination, for accurate reporting of condition.

Technical Specification

Crawler
Dimensions
Length 385 mm (15.2”) x Width 222 mm (8.7”) x Height 102 mm (4”)
Weight without cables
4.75 Kg (10.7lb)
Adhesion
Neodymium iron boron magnets mounted in centre of carriage
Pull off force
13.6 Kg (29lb)
Drive
four (4) independent 12v Dc motors
Drive wheels
Coated in special non-slip synthetic rubber compound
Speed
25 mm/second (1” /second)
Umbilical cable length
B-Scan and DCP 30 metres (98 feet), DCP 50 metres (164 feet)
Transducer B-scan/DCP
Dry coupled wheel using “Ro-Cee” rubber 5 Mhz dual / twin compression
Transducer BP
Irrigated dual 5 MHz
Near surface resolution
2.5 mm (0.1”)
Power supply
28 Ah sealed lead acid gel battery pack with integral charger
Test time
8 hours complete system
Software (UT Lite only)
Data Views
A-scan, profile B-scan, amplitude B-scan
Measurement
Thickness, x distance, amplitude, through paint
Waveform mode
RF & full rectification, smoothing
Data export
Waveform to jpeg. Thickness readings with position to csv.
Gate
Dual gates, fully independent
Units
Metric and imperial
Ultrasonic Specification
Pulser
-400 Volt Spike
Receiver gain
0 – 80 dB in 1 dB steps
Filters
Wideband (0.5 – 2 MHz), 1.5 – 3.5 MHz, 3.5 – 7.0 MHz, 6.5 – 12 MHz
Probe range
1.0 MHz – 15 MHz
Sample rate
50 MHz
Range
5920 m/s steel
Probe Range
1.0 MHz – 15 MHz
Probe Mode
Single or dual

Scorpion - Remote Access Crawler, Ultrasonic Inspection

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