Dimensions of SKT PIG body and geometrical parameters of polyurethane discs were selected in the way to allow passage of the PIG through the following peculiarities of a pipeline:
Parts composing the body of the PIG are manufactured as thick-walled parts and made of strong plastic. Carrying and simultaneously cleaning discs are made of wear resistant polyurethane with Shore hardness 75...85.
In case of caliper PIG ordering please write SKT-XXX-T, where
XXX – should be nominal diameter of the pipeline in millimeters,
Specify T when the PIG is ordered with transmitter. In case the PIG is ordered without transmitter then T in the name is not written.
For example: Caliper PIG of SKT line for launching in a pipeline which linear part is made of pipes with outer diameter 325 mm (diameter orifice Dó=300 mm), equipped with low-frequency transmitter PNT-00 (without telemetric module) will be described as caliper PIG SKT-300-T.
Diameters of measuring (caliper) discs are determined based on outer diameter of the pipeline. Usually two measuring discs are installed 85% and 70% of outer diameter.
For works in pipelines with thick walls (15mm and more) it is necessary to provide us information about the pipes wall thickness.
Based on SKT family design we developed a set of PIGs for cleaning of so called telescopic pipelines. I.e. the pipelines which were welded from pipes of different diameters. For example from pipes diam 325mm and diam 377mm. We called such PIGs as telescopic SKT PIGs.
They have sloted polyurethane discs along with conventional discs. Due to this design the PIG can clean well the pipeline where other PIGs are not sutable. Telescopic SKT PIGs go through bends with radius R=1.5D and narrowings with cross-section dimension 70% of outer diameter D (in the pipe bigger by diameter).
For example for cleaning of a pipeline made of pipes with outer diameter 219mm and 273mm we offer cleaning PIG called SKT-200-250. Pipes wall thicknesses don't matter in this case.
Low-frequency transmitter PNT can also be installed inside any telescopic SKT PIG. So there will be possibility to trace the PIG motion inside the pipeline.
Instead of low-frequency transmitter PNT in a PIG one can install a low-frequency transceiver PPNT, which has the same attachment dimensions. The main difference of the transceiver is that it can be switched to the lowest level of power consumption (sleep mode) right through the metal walls of the closed launching chamber of pipeline walls. In this case, a PIG with the transceiver can be located inside the launching chamber under pressure for several days or even weeks. Thereafter, it can be switched on to function as a conventional transmitter 22 Hz without opening the chamber.
To send a command through thick closed metal (or reinforced concrete) wall special transmitter is used, which also operates at 22 Hz. As the transmitter (remote control) a modified transmitter PNT-04 is used now. In future the function of 22 Hz remote control is planned to be added to modified LF locator NPR-00.
Thanks to the disassemble housing from polyurethane (or polyamide) bushings, various modifications and configuration of SKT PIs are possible. The modifications include changes in the number and location of polyurethane cleaning and supporting discs or cuffs, installation of various additional equipment, magnets and brushes.
We can deliver short version of SKT PIG with the body made of rigid polyurethane bushes or all-polyurethane solid-casted PIGs for automatic launching via three-way Ball Valve.
In all these short PIGs one can insert low frequency transmitter to track and search the PIG while it is moving through a pipeline.
The illustration shows short PIG for three-way Ball Valve in the pipeline with diameter DN = 12" (300 mm) and for diameter DN=4" (100 mm)
Manufacturer: APRODIT Ltd.
140402, Russia, Moscow region, Kolomna, Okskiy prospect 40.
Have a question? Please contact us by phone +7 (916) 674-82-59 (English) or by e-mail firstname.lastname@example.org