Steam Trap Inspection Procedure

  • Visual inspection: The inspection begins with a visual examination of steam trap components, including the trap body, valve mechanisms, piping connections, and insulation. This step helps identify any obvious signs of damage, such as leaks, corrosion, or physical wear. It also allows the inspector to assess the general condition and cleanliness of the steam trap.
  • Measurement and testing: Specialized equipment, such as ultrasound leak detectors along with temperature sensors, is used to measure and evaluate the performance of steam traps. Common parameters measured during inspection include steam temperature, condensate temperature, pressure differentials, and discharge rates. These measurements provide crucial data for assessing the operational efficiency of the steam trap and detecting any abnormalities.
  • Functional testing: Steam traps are subjected to functional tests to evaluate their ability to perform their intended operation effectively. This may involve manually opening and closing the trap, observing the response time, and ensuring proper sealing of the valve mechanism. Functional testing helps identify faulty traps that may not be visible through visual inspection alone.
  • Repair or Replacement: If a steam trap is identified as defective or inadequate during the examination, suitable corrective measures are taken. In certain cases, small fixes, such as replacing gaskets or seals, can be performed on-site. However, if the damage is substantial or irreversible, the steam trap may need to be substituted with a new unit.
  • Documentation and reporting: Thorough documentation is critical throughout the inspection process. Inspectors document all findings, including visual observations, measurement data, test results, and any repairs or replacements made. This information is compiled into a report that includes recommendations for additional maintenance activities, such as repair schedules, spare part requirements, or system upgrades.

Why Technomax


It is important to note that steam trap inspection services require specialized knowledge and expertise. At Technomax, trained inspectors with experience in steam systems and trap operation are typically perform these services. We are well-versed in the various types of steam traps, their operating principles, and common issues that can arise. Additionally, we have the necessary equipment and tools to conduct accurate inspections and provide informed recommendations.

Regular steam trap inspection services provide several benefits to industrial and commercial facilities. These include,

  1. Energy savings: Faulty or failed steam traps can result in significant energy losses. By identifying and repairing such traps, energy waste is minimized, leading to reduced operational costs and improved energy efficiency.
  2. Equipment protection: Properly functioning steam traps help prevent condensate accumulation in steam lines and equipment. This protects sensitive components from damage caused by water hammer, corrosion, or reduced heat transfer efficiency.
  3. System reliability: Reliable steam traps ensure the continuous and efficient operation of steam systems, reducing the risk of process disruptions, production downtime, and costly repairs.
  4. Environmental sustainability: Steam trap inspection services contribute to sustainability efforts by reducing energy consumption and greenhouse gas emissions associated with steam generation.

How is Ultrasound Testing in Steam Traps Performed?

Hand-held airborne and structure-borne ultrasonic devices detect and receive high-frequency sound waves generated due to various reasons, including friction (caused by non-lubricated bearing), ionisation, and turbulence (caused by a pressurized air leak or a failed steam trap). Since these high-frequency sounds are outside the typical human hearing range, they are not audible to us.

The ultrasonic testing instrument can receive these high-frequency sounds and convert them into an audible sound that the inspector can hear through his headset. The sound is then quantified in decibels (dB) on the instrument’s display screen and can also be displayed as a spectrum in the Fast Fourier Transfer (FFT) or Time Wave Form, depending on the device.

Every inspector begins by using a simple spot radiometer to take temperature data. The temperature will tell the inspector whether steam is entering the trap or not, but it can also estimate steam pressure.

If the steam trap is cold, the inspector should double-check that the valves are open and that the trap has not been removed from use. If the steam trap temperature is high, the inspector should note the input and exit temperatures before doing an ultrasonic test.

SONOTEC's SteamExpert

SONOTEC’s SteamExpert is a one-of-a-kind ultrasonic steam trap examination instrument offered by Technomax. SONOTEC provides its customer’s solutions that are tailored and compactable with their ultrasonic preventative maintenance requirement. Thus, the SteamExpert app was developed to quickly and affordably test Steam traps of various types and brands.

The software is for use with the SONAPHONE digital ultrasonic testing instrument and the BS20 ultrasonic and temperature sensor (Broadband Structure-Borne Sound and Temperature Sensor), which is used to detect and categorise leaks in compressed air, gas, and vacuum systems and save money on energy.

The SONAPHONE performs all the testing processes and provides us with all necessary information regarding the condition of the tested steam traps. These tests can be scheduled in sections using the DataSuite software, and the results can be thoroughly studied and reviewed. The ultrasonic test results can be stored, analysed, and managed using the SONAPHONE DataSuite.

Wrapping Up


In conclusion, steam trap inspection services play a vital role in maintaining the performance and efficiency of steam systems. By conducting regular inspections, businesses can identify and resolve steam trap issues, minimize energy waste, protect equipment, and ensure system reliability. The process involves visual inspections, measurements, functional testing, and appropriate repairs or replacements. Ultimately, steam trap inspection services contribute to cost savings, equipment protection, system reliability, and environmental sustainability.

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