Our products

Electronic calipers PVM are manufactured by APRODIT LLC since 2006. Such in-line tools are also called: electronic in-line caliper meters, multichannel caliper, in-line geometric caliper or simply caliper. Electronic calipers are used for initial inspection of pipelines. They determine the most critical bore in a given pipeline. Also all narrowings in the pipeline can be detected, visualized and measured. It is important before carrying out in-line inspection by magnetic (MFL, TFI) or ultrasonic (UT) in-line inspection tools. Because MFL, TFI, UT, EMAT, etc. tools all have some limited passability. In other words they can stuck in a pipeline if it was not checked previously by a caliper. All PVM calipers are equipped with a navigation modulus. Therefore, after PVM run through a pipeline, it is possible to re-construct its trajectory from the launching chamber to the receiving chamber. This process is called xyz-mapping. As a result, we get a GPS trajectory in the form of a kml-file for import into geographic information systems (GIS). An example of a free GIS is Google Earth.

Multichannel in-line calipers

Electronic calipers PVM with navigation modulus for geometry inspections of oil and gas pipelines.

Low-frequency transmitters PNT-00, PNT-02, PNT-04, PNT-06, PNT-08 (also called LF transmitter, 22 Hz transmitter, pig transmitter, transmitter or pinger) are installed in the towing sections of in-line calipers, in magnetic and ultrasonic flaw detectors, as well as inside various cleaning in-line pigs and in pistons, gauging pigs, piston-separators, displacement pistons, etc. The signal from the PNT transmitter at a frequency of 22 Hz passes out through the metal walls of the pipelines and is received by the low-frequency receivers of the NPR (low-frequency receiver, receiver-recorder, non-intrusive recorder, signaling device of the passage of soda and other names)

Low-frequency transmitters

PNT transmitters (22 Hz) for installation on in-line inspection tools and cleaning pigs.

Low-frequency receivers NPR (also called LF receivers, non-intrusive recorders, 22 Hz receivers) can detect very weak signals at frequency of 22 Hz from a low-frequency transmitter PNT (or other low-frequency transmitter). The transmitter is usually installed inside a in-line cleaning pig or in-line inspection tool, which moves inside an oil pipeline or gas pipeline under the influence of pressure from the pumped medium. Receivers NPR help to find a stuck pig with transmitter or track the in-line inspection tool along a pipeline during in-line survey of the pipeline.

Location & tracking receivers

Receivers NPR for detection and registration of signals from low-frequency (22 Hz) transmitters.

Pressure and temperature recorder RDT is also called Data logger RDT. Data logger RDT is installed inside in-line PIG (cleaning, gauging, batching, mandrel, etc.) in order to record the distribution of pressure and temperature along the pipeline. Additionally, an RTD, having high-precision pressure sensors, can also record the differential pressure, which pushes the pig through the pipeline. Thus, it is possible not only qualitatively, but also quantitatively determine in what places in the pipeline most of all wall deposits accumulate. By comparing this data with the recorded temperature and pressure graphs, experts can draw conclusions about the application of various inhibitors and additives that are added to the pumped liquid or gas in order to reduce the deposition on walls or reduce the resistance during pumping. Due to high-precision gyroscopes all bends in the pipeline will be identified and can be reported.

Pipeline data loggers

Pressure and temperature recorders RDT with gyroscopes for installation to in-line pigs from 4" to 56"

Acoustic locators LKA-00 are used in the oil and gas industry to detect by sound about the approach of an in-line flaw detector or a cleaning piston (pig), to the point on the pipeline where the observer (operator) with an acoustic locator is located. For in-line inspections, it is important to know about the approach of the flaw detector in order to have time to turn on and configure a more accurate device for recording the time of passage of the flaw detector through a certain marker point, which is then used for more accurate reference by distance of the detected defects. Acoustic the locator has a very sensitive geophone, which can be magnetized to the wall of the pipeline or pipe fittings, or installed on the ground above the pipeline. Detection distance from 500 to 2000 meters.

Acoustic amplifiers with geophones

Locators LKA for tracking and searching of an in-line pig by sound.

APRODIT LLC manufactures in-line pigs of the SKT series and the USO series. SKT pigs (also called gauging pigs or caliper pigs) have a good passability. SKT pig can safely pass reduction of internal diameter up to 70% from the pipeline outer diameter. SKT is used to calibrate pipelines. In this case, calibration (gauging) slotted metal discs are installed. They also are used for cleaning of pipelines with significant restrictions or geometric defects. USO series pigs better clean the inner surface of pipelines, but have not so good passing ability. USO can go only through bore 85% of the outer diameter of the pipeline. USO series pigs are also called: bi-directional pig, bi-di pig, collar or multi-lip pig, cup or multi-cup piston, polyurethane pig, batching pig, separator piston, magnetic pig (if a belt of magnets is additionally installed), brush pig or piston (if optional metal brushes are installed).

Cleaning and gauging PIGs

Utility pigs, solid casted polyurethane pigs, pigs with metal brushes.

Any spare polyurethane discs or cups for in-line pigs, and in-line inspection tools.

Spare parts for in-line PIGs

Discs, cups, gauging disks, disc brushes.

APRODIT LLC not only develops manufactures and leases FDA calipers, but can also supply hotel units and systems for third-party flaw detectors. For example, our high-precision odometers have a current consumption of about 1 mA (with a supply voltage of 3.3-5.0 V) and operate at speeds up to 30 m / s

OEM parts for inspection tools

Odometers and odometric systems, electronic modules for in-line tools and more.

Development of any non-standard equipment, related to the topic of in-line inspections, pipeline cleaning, or repair and maintenance of pipelines in an efficient and trouble-free state.

Non-standard equipment development

Development of custom equipment.

Manufactured by Aprodit Ltd. All products are certified. Manufacturer gives 12-month warranty*.

* - Except parts prone to natural wear: cuffs, disks etc.