Inspection Services

When Customers are in need of information about the condition of their furnace and the expected lifetime, there are certain steps to be taken before we can make a recommendation;

Our Services are not limited to any kind of Installation such as:

  • Blast Furnaces
  • Hot Blast Stoves
  • Coke Batteries
  • Electric Arc Furnaces (Six-in Line Furnaces, DC-Arc Furnaces)
  • Rotary Kilns
  • Walking Beam Furnaces

For that we have developed a program where the Customer can choose the moment he should get us involved. That obviously depends on the data and information which is already available.

We supply the Inspection Services with the following components:

Data Review

The review will be done on those documents available of existing operational data, materials specifications and installation drawings, etc., in order to get a good understanding of Furnace Design furnace behavior and history.

Field Inspection

Upon Data Review, a Field Inspection program will be presented. That normally includes detail discussions with the customer about the data and a detailed Site Survey, which could comprise of the following;

  • Visual Inspection during operation
    During normal operation there are a lot of aspects to be looked at, such as the physical condition of Furnace Structural (metallic) parts, Furnace Equipment and Standard Operational Practices.
  • Visual Inspection during shutdown
    During a scheduled shutdown or furnace stop it is normally possible to have a look at the Furnace and its lining. When cold enough we can enter, otherwise an inspection from a safe distance with digital camera will be possible.
  • Thermal Imaging
    With an Infrared Scanner we can check the Temperatures of the outside of the Furnace shell. That gives us a good indication of the condition of the lining on the inside. Using the original design data we can calculate heat transfer and compare normal shell temperatures with the actual temperatures.
  • Core Drillings
    Depending on the type of Furnace and the condition of it, there is a possibility to get a good indication of the lining condition and composition by taking Core Samples. That can be done under hot conditions by taking the right safety measures, for the personnel and the furnace/lining behaviour. The cores will be inspected visually on site and can be taken to a laboratory to get details about their chemical properties, like chemical attack, CO-disintegration, porosity, density, etc. Those results can then be compared with the design properties and the analysis helps to predict future furnace lifetime and the optimum material to be used.
  • Endoscope Inspection In cases a visual inspection is not possible and there is still a need of information from the actual condition at the inside of a furnace, it is possible to perform an Endoscope Inspection. The water cooled lance, with a camera connected, can be inserted into the furnace, thru existing doors, manholes, nozzles, etc. at a depth between 0, 5 to 3 meters inside. The camera allows us to get images from 360° around and under a 90° or 45° angle. That enables us to look at the walls, roof, floor, etc. of each type of Furnace (except for those containing liquids). The images are saved digital and presented to the Customer, as part of the report.


Upon collecting all data and Inspection findings/results, a detailed analysis will be done. The outcome of the analysis will be presented to you in a Furnace Assessment Report, comprising of the following typical items:

  • Summary of Inspection Outcome
  • Overview of data collected
  • Inspection findings
  • Current Furnace/Lining condition
  • Recommendations for immediate action
  • Recommendations for scheduled/planned repairs
  • Optional Design modifications
  • Optional Material changes