Why do pipeline inspection?

In recent years, many underground pipelines in many areas in the world have caused major work safety accidents due to damage and leakage, which has caused many unrecoverable losses, highlighting the importance of underground pipeline inspection. After long-term use of underground pipelines, deformation, rust, corrosion, etc. may occur due to many factors. It is impossible to do dig out inspections in deep buried underground. Pipeline inspection operations can effectively identify problem areas and evaluate where they are and make repairs.


Caliper Pigging

  • Caliper Pigging provides powerful tools and secondary detection for intelligent inspection. The Caliper tool continuously measures the inside diameter of the pipe with a series of spring-loaded sensing pointers to keep them in contact with the pipe wall. All radial sensor motion is detected and recorded as the tool moves through the pipe. The odometer wheel generates distance data that is continuously collected and stored with measurement data from radial sensing fingers.


















  • Any changes to the inner surface of the pipe are used in a user-friendly format for independent verification of any ID function.
  • The Caliper tool utilizes a set of mechanical fingers or arms against the inner surface of the pipe. Caliper Pigging is used to measure the internal geometry of the pipe. They have a range of levers mounted on the Pigs. The lever is connected to the recording device in the body of the Pigs. The body is usually compact, accounting for approximately 60% of the diameter of the internal pipe, combined with a cup seal to allow the Pigs to pass up to 30% of the shrinkage. The ability of Caliper Pigs to contract means the risk of getting stuck is minimal.


















  • The Caliper tool can be used in conjunction with the INS, which includes an internal navigation system (INS) that implements a 3D software representation of the pipeline, showing deformation, misalignment, bending, elevation changes, and direction changes. Usually they can also detect and locate main line valves, and other accessories. As with all online testing tools, these tools have limitations on the range of results they use and obtain, and need to be evaluated on a case-by-case basis.
  • Our software is easy to use and allows the entire pipeline location to be fully recorded in an easy to read format.
  • The geometric deformation tool continuously measures the inner diameter of the pipe through a series of sensors that are in contact with the pipe wall; when the geometric deformation pigging tool passes through the pipe, all of its radial sensor dynamics are detected and recorded. Any changes in the inner wall surface of the pipe are presented in a manner that is easily understood by the user for verifying any individual pipe wall features.


Timing of pipeline deformation detection

  • Pipeline establishment

  • After the pipeline is modified

  • Before smart PIG detection



  • Detecting ovality and dents
  • Detecting valves and elbows
  • Detecting welds and T-tubes
  • Can be used in liquid or natural gas pipelines.
  • Can pass 1.5D bends.
  • Suitable for pipes of any length.
  • 3D mapping of pipes can be used in conjunction with geometry Pigs.
  • Existing common inspection methods.



Ultrasonic Testing (UT) Intelligent Pigs

Ultrasonic intelligent detection is the direct measurement of reflected sound waves to determine the wall thickness and metal corrosion or deformation loss.

  • We are experts in the field of pipe pig inspection, using the UT Intelligent Pipe Cleaning Tool (PIG) to detect underground pipes. UT Smart Detection Pigs are more popular due to their smaller size, lighter weight and easier mobilization. When it comes to inaccessible pipes or pipes without launch and receiving facilities, if the length of the line allows, then UT is the preferred solution for higher precision. This method is less expensive than MFL (flux leak detection).









  • The system consists of a horizontally placed transducer contained within the center of the Pigs. The transducer sends the sound wave forward to the 45° mirror and then directs the sound wave vertically to the pipeline wall. From the inner pipeline wall, the next signal will travel to the outer pipeline wall. Whenever a signal hits the surface, it bounces in the same way as it does, allowing the computer to calculate the travel time. This travel time is then converted to distance and there is a measurement.
  • Ultrasonic testing is not suitable for very thin wall thicknesses, but for all practical purposes this is independent of the type of piping typically checked in the upstream, midstream and downstream oil and gas industries. The UT tool is well adapted to most wall thicknesses in the oil and gas industry.
  • Since this technique requires a liquid couplant that the pulse can pass through, there must be liquid in the pipe, although by using the dosing technique where the liquid slug is between two highly sealed Pigs, the gas pipe can be inspected with UT Smart Pigs.
  • The advantage of our UT Smart Pigs is the ability to provide highly accurate values ​​for local wall thicknesses while being lightweight, small and easy to mobilize. With this high precision, the ultrasonic tool can be used to compare actual wall thickness to nominal wall thickness, verify previous inspections, and be suitable for service evaluation and baseline surveys.






















  • All of our smart pigs are capable of detecting, locating and evaluating defects or metal corrosion losses inside and outside the pipe wall. The pipe can be read and recorded up to 1600 times per second, providing a complete profile and accurately reporting the thickness of your entire pipe in millimeters.

UT Smart PIGS can be used to check the following pipes

  • Carbon steel
  • Stainless steel
  • High density polyethylene (HDPE)
  • HDPE lining tube
  • Riser
  • Any diameter from 4" to 64"
  • Undersea or above ground
  • Bare, coated or insulated



  • Highly accurate inspection results.
  • Small and lightweight tool for easy mobilization
  • Suitable for all pipe materials.
  • Easy to launch in hard-to-reach areas.
  • Clear and easy to understand data analysis and reporting.
  • Provide instant on-site reporting.
  • No wall thickness restrictions.
  • Flexible risers and turrets are available through 1.5D bending and PLEM.


Application range and detection capability

  • On land or at sea, on the sea floor or on the ground.
  • Oil and gas exploration and production, refineries, petrochemicals, mining, heavy industry.
  • Pipe lines within 50 lengths can be optimized.
  • The precision of detecting the actual remaining wall thickness is +/- 0.1 mm.
  • Detection of corrosion, dents, chisels, lamination and pitting.