How APRIS works?

APRIS guides the operator through all the steps necessary to carry out a job simply and efficiently with minimal training requirements.

1. Job setup | Tube Sheet Mapping

A photograph or schematic diagram of the heat exchanger is uploaded to the software installed on the laptop or notebook computer in order to create a map of the tube sheet. Each of the tube openings is assigned a number. This enables the system to create a graphic representation of the heat exchanger and to keep track of which tubes have already been measured, allowing the technician/inspector to work in a systematic manner.

2. Setup of Inspection Parameters

Using APRIS’s intuitive user interface, the technician/inspector sets a few inspection parameters related to the physical attributes of the tubes. These include the tube’s length, diameter and wall thickness.

3. Taking the Measurements

Using the APRIS’s compact handheld device, the technician/inspector begins to inspect the tubes in accordance with the tube sheet map. The probe is inserted into each tube opening for approximately 10-15 seconds. It emits an acoustic pulse and then measures the resulting reflections using APR Technology. LEDs on the probe indicate when the measurement is complete, and the software guides the technician to the next tube to be measured.

4. Set Inspection Thresholds

Once all the measurements have been taken, a reference measurement is calculated based on statistical signal processing, considering statistical deviation of tube signals and the presence of ambient noise. Any measurement beyond that deviation is a potential flaw. In addition, the APRIS software enables the heat exchanger owner to determine thresholds for each type of defects such as hole, blockage, pitting and erosion depending on the sensitivity of the given application (e.g., diameter of hole, percentage of cross section reduction, percentage of wall loss, etc.). Only those measurements that exceed the defined threshold are reported as flaws.

5. Data Analysis and Report Generation

The raw data (i.e., signals) collected by the system is interpreted and presented to the technician/inspector for review and verification. This entire process is performed automatically by APRIS software that works on sophisticated Artificial Intelligence (AI) based algorithms.  It generates a final report (PDF) containing summary information, including tabular reporting, charts and screenshots of the detected flaws.


Inspection Range Tube Size :7mm-100mm (0.27”-5.9”) inner diameter.
Length: Up to 25m (82’) length, if inspected from one end. Up to 50m (164’) length, if inspected from both ends.
Detectable Defects   5/16”-2 1/2” (8mm – 63.5mm) Tubes 2 1/2”-4” (63.5mm – 100mm) Tubes
Erosion & Pitting
Minimum diameter 0.039” (1mm)
Minimum of 5% of cross section
Minimum 10% of wall thickness
Minimum diameter 0.118” (3mm)
Minimum of 10% of cross section
Minimum 20% of wall thickness
Tube Configuration Any configuration including U-bends, finned tubes, twisted tubes, multiple bends and spiral wound tubes.
Tube Material Any material including: metals (ferrous and non-ferrous) and non-metals (graphite, composites).
Inspection Speed Less than 10 seconds per tube depending on tube size, length and configuration
Hardware Compact handheld device
Non-invasive probe assembly including a transducer, microphone, controls, LCD screen and adaptors to fit tubes of any internal diameter up to 150mm (5.9”). Customized extensions (optional) for easy access to tube openings in challenging situations such as air cooler headers, hand holes for super heaters, economizers.
SOFTWARE Data Acquisition Software
External notebook/laptop computer connected to handheld device. Sophisticated APRIS software installed in computer shall be utilized for inspection setup, probe status monitoring, test data recording.
PORTAL Exclusive for interactive analysis using sophisticated algorithms based on artificial intelligence & deep learning which assist to generate quality and intuitive report based on user needs.
Seamless interaction among service providers, asset owners and manufacturers to enhances the user experience to track the inspection activities, reports and other support pertaining to inspection.
Algorithm Patented Acoustic Pulse Reflectometry (APR) technology featuring specialized, proprietary algorithms for NDT inspection.
Reporting Customizable, graphical on-line reports. Available output in PDF or HTML format.
Physical Characteristics Compact, rugged and lightweight design.
Total box weight: 14.88 lbs (6.75Kg)
Box dimensions: 45 L x 32 W x 20 H (17.7” x 12.6 x 7.8 cm)
Power Input Dual voltage system (110V/220V)
Temperature Range -10° to +50° C (14° to 122° F)
Certifications CE Declaration of Conformity; Safety Certificate IEC 61010; EMC Test Certificate;
Company Quality System certified to ISO 9001:2008
Standards ASTM E2906/E2906M-13
ASME BPVC.V-2017-Article 18