Pipeline data loggers of RDT series were designed to be installed on in-line utility PIGs. RDT registers changes of pressure and temperature as well as accelerations and shocks while the PIG is moving inside a pipeline. This device also registers pressure difference in front of the PIG and behind it.
RDT can be used in natural and industrial gas, oil, petroleum products, multiphase media (gas + liquid) and water (including salty sea water)
Low-frequency transmitter can be installed on the PIG simultaneously with RDT data logger. The transmitter makes it possible to track the PIG while it is moving inside the pipeline or to find the PIG if it stops inside the pipeline with use of low-frequency locator.
Before installation on a PIG the data logger RDT ought to be connected via USB cable to a computer. User can specify the data storage time interval in the range from 1/128-th of a second up to 1 time per 32 seconds.
After running through the pipeline RDT is again connected to a computer and information from the internal memory is copied to the computer. For the analysis of the recorded data (graphs of pressure, differential pressure, temperature, accelerations) specialized software is used.
This software enables to plot the data vs. time or vs. distance. That is the X-axis on the graphs can be either time is seconds or distance from the launching chamber in meters. This recalculation from time to distance could be accurately done not only for fluid media (oil, water, etc.) but also for gaseous media (gas or air) based on more sophisticated mathematical model and regardless that the speed of any PIG moving in long gas pipeline increases nonlinearly towards the end of the run.
Moreover in this software it is possible to load in one window and compare the graphs of pressure or temperature from different runs (performed in different time) vs. distance from lunching chamber.
Such analysis gives possibility to evaluate the rate of debris, scale or wax deposition on the walls of the pipeline. So it is possible to figure out the optimal time period for pipeline cleaning by the PIGs.