Once good enough, no longer
Intrusive Pig Signallers
Intrusive Pig Signallers have been around a long time and really haven’t moved forward to meet the needs of modern Pipeline Control or Pipeline Control Rooms. Typically, in the past the pig sig was tripped and a Field tech on site called back the activation and reset it for the next run…. Or did they? Sometimes, the Intrusive Pig Signaller didn’t trip due to damaged targets because of improper installation in the pipe or contaminants gumming up the Target. Later, to help cut some of the costs, the addition of relays in a junction box were added to provide some indication when the Intrusive Pig Signaller did trip to a SCADA RTU. Of course, there was no way to know the validity of the signal.
Meeting the needs of today and tomorrow
Non-Intrusive Pig Signallers
Non-Intrusive Pig signallers today provide local indication with Flashing RED lights upon pig passage, Relay outputs and Analog 4-20mA signals (if you don’t have relay input slots available on your RTU) and with some equipment information on the pig signal passage characteristics addressable by MODBUS RS485 so that if any questions occurred it can be viewed from the control room thousands of miles away. Many different programming, data logging and other information can be collected or reprogrammed via the MODBUS connection.
If local indication needs to be sent some distance, Long Range Radio connection (LoRaWan) high security (chirp spread spectrum) with daisy chain systems that can communicate for many miles/kilometres is available if no RTU is nearby. Satellite Communication is also now possible with more than just a simple Pig Passage indication.
Non-Intrusive Pig Signallers are smarter, longer lived, more capable of describing the passage and as mentioned briefly in the 3rd instalment there are also many more options than just simple hall effect magnetic indication. 3 axis Magnetometers provide description and direction of detected magnetic signals. Settings can be customized to detect the approach of ILI tools as differentiated simple maintenance pigs.
Ultrasonic Active pig trackers can be programmed to ignore sand and bubbles and just look for the appropriate amount of missing return pulses. Acoustic trackers can listen to the characteristic approach and pass characteristics a pig in a line.
Non-Intrusive trackers provide more detection options, more detection signal characteristics, more communication options, and easier installation than older generations of equipment. Non-Invasive Pig Signallers are ready made to work with your digital twin representations in the SCADA control system and diagnostics to provide much more information to your Machine learning and AI predictive software
Let us know your needs so we can arrange field trial units and training for your personnel. If you want custom programming changes or communication methods, HART, PROFIBUS etc just let us know as our special project engineers stand ready to help.