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Ultrasonic thickness measurement (UTT) is a non-destructive testing method in which an ultrasonic pulse is sent into the material, and the travel time of the wave reflected from the opposite wall is converted into the component's thickness. This makes it possible to quickly determine the remaining wall thickness of pipelines, tanks, steel structures and other components, without the need to cut them or damage them.

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Ultradźwiękowe pomiary grubości (UTT)

At ULTRARENT we use modern UT thickness gauges (in single-echo and multi-echo modes, including through-coating measurement) and, where justified, grid scanning/corrosion mapping, which provides a better picture of the distribution of material loss than single point measurements. Thanks to portable thickness gauges we can quickly assess the actual wall thickness on installations and equipment located at height and in hard-to-reach places. Testing is carried out in accordance with EN ISO 16809, by inspectors certified to EN ISO 9712, level 2 and 3.

In practice this means:

fast, non-destructive measurement of wall thickness, without the need to cut out samples or shut down sections of the installation,
the ability to measure through paint coatings, which reduces the need for surface cleaning and coating removal,
detection of corrosion loss, erosion and wall thickness loss in pipelines, tanks, boilers, shells, heads and steel structures,
the use of measurement grids and simple corrosion mapping (grid-based UT) where a more detailed image of the distribution of material loss is required,
the portability of the equipment allows work in difficult conditions: at height, on offshore projects, in explosion-hazard zones, and in confined spaces,
the ideal tool for periodic maintenance inspections at refineries, chemical plants, fuel depots and terminals, and in the power industry.
ULTRADŹWIĘKOWE POMIARY GRUBOŚĆI (UTT)

Thanks to portable thickness gauges we can quickly assess the actual wall thickness on installations and equipment located at height and in hard-to-reach places.

ULTRARENT Sp. z o.o. is a professional non-destructive testing (NDT) laboratory that provides testing and inspection services across the entire country — from Pomerania to the Subcarpathian region, and from Lower Silesia to Podlasie. Thanks to our wide operating reach and qualified team of specialists, we offer comprehensive service for both medium and large enterprises, as well as smaller industrial plants — in every voivodeship of Poland

List of voivodeships we serve:

Lower Silesian Kuyavian-Pomeranian Lesser Poland Masovian Opole Subcarpathian Podlaskie Pomeranian Łódź Lubusz Silesian Świętokrzyskie Greater Poland Kuyavian-Pomeranian Warmian-Masurian West Pomeranian

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ULTRADŹWIĘKOWE POMIARY GRUBOŚĆI (UTT)

Corrosion mapping is an advanced NDT method used to image thickness loss and the distribution of corrosion damage on the surface of pipelines, tanks and pressure equipment.

Volumetric methods:

Digital radiography in NDT covers the DR (Digital Radiography) and CR (Computed Radiography) techniques, in which X-ray or gamma radiation passes through the component and an image of the internal structure is recorded by a digital detector or imaging plate instead of classic film.

Phased Array Ultrasonic Testing (PAUT) is an advanced NDT method in which a multi-element ultrasonic probe generates an electronically steered beam at multiple angles in a single scan, enabling a full volumetric assessment of welds, castings and structural components.

Ultrasonic testing (UT) is an NDT method in which an ultrasonic wave is introduced into the tested component via a probe, and the reflected signals are analysed in order to detect internal and surface discontinuities.

Depending on the type of material, geometry and risk of cracking, we also recommend surface methods:

Penetrant testing (PT) is an NDT method used to detect discontinuities open to the surface, based on the capillary penetration of a penetrant into cracks.

Magnetic particle testing (MT) is a non-destructive testing method used to detect surface and near-surface discontinuities in ferromagnetic materials such as carbon and low-alloy steels.

UTT testing involves sending an ultrasonic pulse into the material and measuring the wave’s travel time between the surface and the back wall. This time is then converted into thickness at the known wave velocity for the given material. The method is used, among other things, to assess the actual wall thickness of pipelines, tanks, steel structures and machine components exposed to corrosion, erosion or abrasion

UTT very effectively reveals thickness loss associated with corrosion (internal and external), erosion and general wear, allowing the minimum wall thickness values in the tested area to be determined. Indirectly, it also helps identify areas of accelerated loss that require detailed analysis in order to make decisions about continued service.

It is most commonly used on pipelines, tanks, pressure equipment, heat exchangers and steel structures exposed to corrosion and erosion. It is especially valuable where thickness loss develops gradually and may remain unnoticed until a problem occurs.

Because early detection of a decrease in thickness allows a repair to be planned before a leak, failure or production stoppage occurs. This directly reduces operational risk and the costs associated with unplanned downtime

No – classic UTT mainly provides point data or data from simple grids, while full corrosion mapping uses denser measurement grids or scanning to generate a thickness C-scan, which better shows the distribution of material loss. In practice, UTT testing represents a basic way of inspecting the tested components.

Yes, many modern UTT thickness gauges offer a multi-echo or echo-to-echo mode, which “skips” the coating layer and allows the thickness of the base material itself to be measured without the need to remove the paint, saving time and surface-preparation costs. The final feasibility, however, depends on the type and thickness of the coating and its condition. The paint layer must adhere well to the tested surface.

Not always. The actual thickness says a lot about material loss, but it will not reveal all discontinuities, such as cracks or volumetric discontinuities. That’s why in practice it is combined with other NDT methods such as RT, UT, PAUT, PT or MT, in order to obtain a more complete picture for risk assessment and technical condition.

See all
PAUT

Phased Array Ultrasonic Testing (PAUT)

TFM

Ultrasonic Testing Total Focusing Method (TFM)

CR/DR

Digital radiography (DR)

VT

Visual testing (VT)

MT

Magnetic particle testing (MT)

See all

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  • Testing laboratory recognized by UDT — testing conducted in accordance with quality requirements for regulated equipment and critical processes
  • Less downtime and continuous operation — early detection reduces the risk of failure and costly shutdowns
  • Fast readiness and short turnaround times — efficient logistics, priority scheduling, express test results
  • Classic and advanced NDT inspection techniques performed by a team of specialists with years of experience
  • ISO 9712 Level 3 in all five principal NDT methods — VT, PT, MT, RT and UT. We write and approve the inspection procedure, not only perform the test.