An advancing technology for detecting and analyzing corrosion in pipes where access is difficult

BENEFITS

  • Low cost screening with 100% coverage
  • Focusing capability to evaluate corrosion distribution around pipe circumference
  • Typical test range 60m 197’ from single location, ideal conditions can achieve 350m 1148’. Coast Analysts have successfully achieved a 570’ examination on a span with supports over a river.
  • Testing of pipes 1.5” up to 48” diameter as a typical range, system is viable up to 72”
  • Proven capability on pipe in service up to 125°C or 257°F
  • Reliable detection of 9% metal loss flaws, this is a volumetric measurement and the unit is sensitive to 3% metal loss.
  • Ideal where conventional testing is impossible or very costly e.g. clamped, insulated, elevated, sleeved or buried pipes.

PROCESS

  • Low frequency ultrasound is transmitted and received from a single location
  • The guided waves used travel long distances, even in buried, submerged or insulated pipe
  • Response from flaws is a function of their depth and circumferential extent
  • Focusing allows ultrasound energy to be concentrated into a small region of pipe for detailed localized inspection
  • Teletest® uses ‘multi-mode’ technology to characterize and quantify any flaw detected
  • A laptop PC runs dedicated Teletest® data acquisition and analysis software. The flaw detector communicates with the PC via a high-speed data link
  • The test equipment is built up in modules to fit ASME pipe sizes

APPLICATIONS

Pipe types:

  • Seamless
  • Longitudinally and spiral welded

Pipe materials:

  • Ferritic and stainless steels
  • Other metals

Pipe situations:

  • Buried
  • Air-to-soil/concrete interface
  • Air-to-water interface
  • Elevated on racks, Spans
  • Sleeved in road crossings
  • Vault Wall, bund or berm penetrations

Flaws found:

  • External corrosion
  • Corrosion under insulation (CUI)
  • Internal corrosion or erosion
  • Environmental cracking (Note this is experimental at the present time)

Pipe coatings etc.:

  • Foam or mineral wool
  • PVC, epoxy, coal tar epoxy
  • Paint
  • Bitumastic/ Somastic wrapping

Pipe duties:

  • Transmission and distribution lines
  • Refinery and chemical plant
  • Offshore risers
  • Jetty lines
  • Tank farm link lines
  • Power plant service pipe
  • Storage sphere support legs
  • Headers
  • Spans
  • Concrete Vault Penetrations

REVOLUTIONARY NEW MINI-TOOL

The Teletest "LATCH and FIRE" Mini-Test tool. This radical design combines the latest light-weight engineering materials and latch design to provide a tool that is lightweight, easy to use and requires only 42mm clearance between the pipes. The use of the latest CAD design software has allowed improved coupling between the transducers and the pipe, maximizing the amplitude of the signal. In addition, the transducers are now retractable, extending their lifetime.

The benefits of this tool over conventional fixed-tool designs include::

  • Lightweight (75% weight reduction)
  • Only 42mm 2”-3” clearance between pipes required
  • 90% reduction in tool set-up time

The tool is available now for pipe diameters of 1.5" to 5" and supersedes the heavy fixed tools.

TOOL SPECIFICATION

Tool Description: A lightweight, easy to use guided wave tool for use on small diameter piping in difficult to access areas.

Minimum Access Requirements: 42mm 2”-3” clearance between pipes, 230mm 9” exposed length of pipe.

Modules

Wave Mode: Torsional.

Transducers: 3 x Plant Integrity standard transducer in recessed mounting.

Ring Quantity & Spacing: 3 rings spaced 30mm.

Operating Temperature: Pipe Temperature: -30°C -22°F to +90°C 194°F.

Material: Laser Sintered, Metal Matrix Composite (MMC) with anodized aluminum mount pins.

Collars

Sizing: Available in sizes for 1.5”, 2”, 3”, 4” & 5” diameter pipes conforming to ASME/ANSI B36.10.

Material: Carbon-Kevlar composite with integral Polyurethane Bladder.

Operating Temperature: Ambient Air Temperature: -30°C -22°F to +90°C 194°F.

Operating Pressure: 28 PSi.

Minimum Access Requirements: 2” to 3” clearance between pipes, 230mm 9” exposed length of pipe



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