N A N O P R E C I S E

Prediction with Precision

Jan 14, 2019
Data Streams & Types During my engineering experience, I used to design the asset to certain parameters which we called, Design & Operating parameters (such as temperature, pressure, flow rate, density etc.). For example, a certain flange at the pump nozzle is not supposed to be operated beyond the +-10% of Po (operating pressure) and it is not supposed to be subjected to a pressure beyond a Pl (flange leakage pressure), which is basically its design pressure limit. Operating parameters are meant to be a certain percentage below the design parameters, just to ensure safe operation. Something to observe here is that the above parameters are internal to any system. Let us define what is a system in an industrial world. Without getting too technical, a system in an industrial setting from a structural point of view is defined as a point from the nozzle of one static equipment such a (column, tank, heat exchanger etc.) to another static equipment. In between, there are machines such as pumps, turbines compressor etc. that are needed to force or transform the fluid that travels through the pipe. As shown below:
All the sensor parameters in this system can be categorized as follows:
• Input characteristics (such as internal temperature, flow rate, pressure, density etc.)
• Output characteristics (such as vibration, RPM, current, sound, external temperature, pipe wall thickness)
The output characteristics here are the system’s response to internal characteristics. By measuring internal characteristics, we cannot really tell the performance of the rotating equipment (shown as pump above). The simple reason is those input characteristics are usually created from static equipment such as heat exchanger, reactor, agitator, fractionating column. Thus, the rotating equipment just reacts to the variations in the input characteristics. Input characteristics are usually defined during the engineering and design stage of the asset, which means the asset is supposed to operate within the operating temp, pressure or flow rate. Thus, input characteristics are basically range-bound:
Relevance to PdM of Rotating Equipment All the initiatives in industrial IoT serve two basic purposes:
• Process & System Usage Optimization
• Predictive Maintenance