RMS2 Automated Ultrasonic C-Scan Corrosion Mapping

  • Remote access ultrasonic corrosion mapping system
  • Very high productivity 17 m²/8 hr shift
  • Very high accuracy scanning
  • Full off line analysis and re-processing

The RMS2 is a high speed, high accuracy remote access ultrasonic corrosion mapping system designed to evaluate the condition of assets as storage tanks, pipelines, pressure vessels and other critical equipment, supporting efficient inspection programme that support integrity management processes to ensure effective and safe operation.

The RMS2 ultrasonic scanner can give 100% coverage in a band up to 1000 mm wide, significantly increasing Probability of Detection (POD) of defects and corrosion, enabling engineers to determine the optimum repair strategy and improve remaining life assessment (RLA) & risk based inspection (RBI) maintenance programs.

The RMS2 is extremely flexible with a range of scanning heads to suit different inspection requirements.

RMS2 Corrosion mapping system
Vessel Ultrasonic Testing
Automated Ultrasonic Scanner
Key Benefits:
  • Automated / remote access UT scanner
  • High speed ultrasonic testing
  • High probability of corrosion detection with up to 0.5 mm scan grid
  • Import inspection data to CMAP
  • Range of scanning heads
  • Inspection confidence
  • Field proven durability & reliability
  • Aid to reduce maintenance costs by minimising use of scaffolding
  • No paint removal required
Key Features:
  • Very high speed for fast coverage with real time image display
  • Variable scan resolution with up to 0.5 mm scan grid
  • Wide range of applications up to 170 ˚C
  • Inspection material thickness up to 150 mm
  • 3D data view for internal/external profile
  • Can be used on any ferrous item form 6” NB to flat plate
  • Longitudinal scanning head for increased productivity on crude oil transfer lines, slug catchers and the like
  • Up to 50 metre long x 1 m wide scan data acquisition feasible in one location
  • Field proven durability & reliability

Flexible solution

All RMS2, automated ultrasonic scanner heads share the same high performance system controller so different scanning heads can be utilised depending on the inspection requirements.

The steerable tractor units incorporate high torque stepper motors and powerful magnetic drive wheels ensuring the scanner remains fixed to the inspection surface even whilst inverted.

RMS Corrosion Mapping Solution

Ultrasonic Scanners

RMS2 600

The RMS2-600 scanning head is designed to maximise scanning rates on large surface areas such as tank shells, pressure vessels and other structures.

  • 600 mm scanning bridge
  • Designed for large surface area
  • Storage tank shells, horizontal tanks, pressure vessels, spheres, ship hulls, large structures
RMS2 600 - Corrosion Mapping Auto UT Scanner

RMS2 450

The RMS2-450 scanning head is designed for operating circumferentially on curved surfaces from 152 mm (6 inches) up to flat plate.

  • 450 mm scanning bridge
  • Designed for inspecting circumferentially on curved surfaces
  • Pipelines, pressure vessels, horizontal tanks, other structures where circumferential is required
RMS2 450 automated ultrasonic scanner

RMS2 300

The RMS2-300 scanning head is designed as a general purpose scanner for inspecting areas with limited access or other applications where smaller scan widths are required.

  • 300 mm scanning bridge
  • Design for inspecting areas with limited access
  • Storage tank shells, horizontal storage tanks, pressure vessels , spheres, ship hulls, large structures
RMS2 300 - Small Area UT Scanner


The RMSARC 24 -36 and 36-48 are designed to operate longitudinally on pipe diameters from 24” to 48”. The combination of longitudinal pipe scanning and 60° scan width brings a major improvement to ultrasonic testing efficiency for pipeline applications while maintaining the high standard of data quality associated with the RMS2.

  • Up to 1000 mm scanning bridge
  • Designed for longitudinally scanning on pipe diameters from 24” to 48”
  • Pipelines, slugcatchers
RMS2 ARC - Pipeline ultrasonic testing

Immersion Ultrasonic Transducer

A single crystal immersion transducer is held in a gimballed probe holder ensuring it remains perpendicular to the surface and allowing it to ride over weld caps & lap joints up to 8 mm high. The stainless steel wear plate prevents transducer damage when scanning over rough surfaces.

The immersion type transducer enables simultaneous mapping of both near side and back wall corrosion, which is easily visualised using the 3D C-scan presentation, something unachievable in standard contact probe solutions. A range of transducer frequencies and focal lengths are available to suit specific material thicknesses from 2 mm, and when combined with the optional extended probe holders allow the RMS2 to inspect material up to 150 mm thick.

RMS2 Ultrasonic Testing Drive System

The RMS2 Motion Control Unit allows RMS scanning heads to be used with third party ultrasonic systems. This system houses the power module, motion control system and X / Y encoder outputs and is supplied with dedicated scanner control PC software but excludes UT hardware and data acquisition software. It can be upgraded by approved service centres to full RMS2 system.

RMS Ultrasonic Transducer

RWP-57 Rugged Water Pump

RMS2 systems are supplied with an RWP-57 ruggerdised water pump. The 3 chamber diaphragm pump includes automatic power switching (100 to 240 VAC - 50-60Hz). The pump is capable of delivering 5.7 litres per minute at a height of 30 metres. The flow rate is electronically controlled can can be finely adjusted to minimise water consumption.

The RWP-57 includes several safety and operational features, a thermal overload protection will switch off the pump in the event of it becoming over heated. An audible alarm is sound in the event of no water being pumped alerting the operator of an issue.

RMS2 Water Pump RWP-54

Data Acquisition Software

The RMS2 software integrates scanner control, data capture, data analysis and reporting tools. The software shows a real-time display of the ultrasonic A-scan, C-scan, thickness measurement and positional data, with a maximum resolution of 0.5 mm x 0.5 mm. All of this information is recorded when a scan is saved.

The modular user interface, has been designed to hide and restore infrequently used controls, with a single mouse click, and save specific screen layouts for future use.

The ultrasonic controls are similar to those on a standard ultrasonic flaw detector so a trained ultrasonic operator can quickly become familiar with all functions.

RMS ultrasonic software setup
Software Setup
Integrated scanner control, data acquisition, analysis and reporting tools
User friendly interface
User friendly interface
Quickly hide infrequently used controls
Restore hidden controls with one click
Save favourite screen layouts
Ultrasonic post inspection analysis
Post Inspection Analysis
The ultrasonic A-scan data, C-scan image and gate information are saved for detailed post inspection analysis
Hydrogen blistering detection
Inspection Capabilities
Scan showing 2D & 3D Images of hydrogen blistering
C-scan minimum and maximum thickness
Defect Measurements
Measurements can be taken from the C-scan with the option to find minimum and maximum thickness
Software Key Features:
  • Integrated scanner control, data acquisition, analysis and reporting tools
  • Real-time A-scan and C-Scan display during scan
  • Fully captured A-scan and gate configuration for post inspection analysis
  • Full offline analysis and reprocessing with multiple gates
  • Near side (external) defect sizing
  • Far side (internal) defect sizing
  • Up to 20 A-scan gates - Several gate types:
    • Peak
    • Flank
    • Fixed position (Can be used for top surface corrosion)
    • Amplitude
  • Up to 19 C-scan layers for data review
  • Sizing tools, length, area, statistical
  • A-scan, B-scan, C-scan and 3D views
  • Export C-Scan data as .CSV files for MS excel

C-Scan Layers & Multiple A-Scan Gates

The software is designed around the concept of C-scan ‘layers’. This allows the RMS operator to quickly switch between each of the multiple C-scan views generated. During a scan, the A-scan trace and resulting C-scan image are shown within the RMS software in real time.

Multiple A-scan gates can be added to measure between several parts of the A-scan trace. This means it is possible to measure the signal amplitude, part thickness, internal surface profile and external surface profile simultaneously. After acquisition the scan can be re-analysed by adjusting gate settings to produce a more accurate C-scan image, or highlight particular indications.

This powerful tool minimises the need for re-scanning due to changes in surface condition or minor set-up errors.

C-Scan multiple layers

A-Scan Processing & Floating Gates

RMS A-scan waveform processing is fully digital, both in real time during a scan and during post processing. The system records A-scans in raw RF unfiltered form, which can then be processed afterwards, including rectification, filtering, wave smoothing and noise reject. This minimises the set up on site and avoids re-scanning due to incorrect ultrasonic setup.

Another new feature to the RMS2 software is floating flank gates. The floating gate “tracks” to the same % of the signal amplitude. This allows signals to be picked up which are much lower in amplitude improving the accuracy and increasing the efficiently of data analysis and reporting with greater inspection confidence.

A-Scan Floating Gates

Ultrasonic B-Scan Amplitude View

The B-scan amplitude view shows the B-scan profile in both X and Y dimensions at a selected point of the C-scan. Using the B-scan amplitude view, the operator can easily identify any defects or inclusions.

C-scans provide an effective method for viewing general wall thinning and larger defects, but indication for small pits and inclusions can often be difficult to see due to their small surface area. By reviewing acquisitions in B-scan mode these potentially critical indications can be quickly identified and sized. The software also has a stacked B-scan mode to aid with identification of stepwise cracking and defects not aligned with the X and Y scanning directions.

B-can amplitude view

Post Inspection Analysis & Reporting

The RMS software automatically stores the A-scan data, C-scan image and gate information. Once a scan has been completed, the data can be analysed using a range of display options including A-scan, B-scan, C-scan and 3D C-scan views. The X and Y position and the recorded thickness measurement are displayed next to the cursor while the cursor is moved or hovered over the C-scan image. A 2-axis B-scan thickness profile is displayed above, and to the side of the c-scan image.

C-scan layers can be used to display a rotating 3D C-scan view of the saved scan. This view shows the thickness of the part, and also the external surface profile, and the internal surface profile. All A-Scan, B-scan and C-scan views can be either printed directly from the software, or saved as digital images in order to create a detailed report.
Inspection Capabilities:
  • Localised / generalised pitting
  • General corrosion
  • Laminations
  • Hydrogen blistering
  • Hydrogen induced cracking (HIC)
  • Stress corrosion cracking (SCC)
  • De-bonding of internal liners
Technical Specification

Ultrasonic Technical Specification
Pulse Voltage
-40 to -300, 256 steps
Pulse Width
50 ns to 320 ns in 20 ns step
Receiver Gain
0 dB to 80 dB in 0.1dB increments
0.6 MHz to 18MHz fixed
Full rectify, + half rectify, - half rectify, or RF
Sampling Rate
50 MHz
8 bits (0 to 255)
Waveform Length
1 to 8190
Trigger Source
+external, -external, internal or software
Transducer Range
1 to 10 MHz
Post trigger delay
0 to 16,370 samples in 1 sample step
Transducer Specification
5 MHz 50 mm focus - Thickness range 6 – 12.5 mm, (0.25”to 0.5”)
5 MHz 75 mm focus - Thickness range 12.5 – 50 mm (0.5” to 2”)
Optional Transducer Specification
10 MHz 40 mm focus - Thickness range 1 – 6 mm, ( 0.04” to 0.25”)
2.5 MHz 75 mm un-focused - Thickness range 50 – 150 mm ( 2” to 6”)
5 MHz dual - 2 mm to 100 mm (0.08” to 4”), requires adapter
Other Available on request
Common Scanner Specification
Scan grid
0.5 to 150 mm in 1 mm steps (0.02” to 6”) independent X and Y
Max scan length
60 m (200 ft) at 10 mm (0.4”) grid
Auto- position
Scanner movement to origin or selected point
Scanner identification
Scanner control
Joystick controller and software
Scanner Capabilities
RMS scanning capabilities
RMS2 600
RMS2 450
RMS2 300
ARC 24-36
ARC 36-48
Min Internal Circumferential
Min External Circumferential
Min Internal Longitudinal
Min External Longitudinal
Flat Plate

RMS2 - Ultrasonic Inspection, Corrosion Mapping Video


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