Overview

Pigging is part of the routine operations for many offshore and onshore facilities. Operators need a reliable method to confirm that the pig has left the pig launcher or to verify its arrival at the receiver. The LT 902 series pigging indicator is based on our patented ultrasonic intelligent sensor technology platform, featuring a compact structure and ease of use. Its quick and simple installation principle is unmatched by other pigging indicators. Furthermore, it can accurately and reliably detect all types of pigs without any inserts.

Principle

The Lightwaves pigging indicator uses passive acoustic (ultrasonic) technology to sense the pig traveling through the pipeline, utilizing a built-in Lock Frequency Digital Signal Processor (LPDSP). When the pig passes the detector's position, it detects and analyzes signal level changes at multiple frequencies. The indication of the pig's passage can be displayed on a local light on the instrument or through signals output to the control system or indicator panel. The signal output indicates "Pig Passed" (eg.,relay contacts) or raw pig passage data for further analysis. By using a computer equipped with Lightwaves's proprietary software or by inputting data into the main control system, users can obtain graphical displays of the signals received from the detector. The output is 4-20mA analog or RS485 digital signal.

Advantages

l   Real-time measurement

l   Non-intrusive

l   Easy to install

l   Modify without showdown

l   local or remote indication

Installation

The Lightwaves pigging indicator (pig detector) features a non-intrusive design, clamping onto the surface of the pipeline without any parts in contact with the fluid. All instruments are calibrated and tested before leaving the factory. The sensor is used to detect pigs traveling through the pipeline where the sensor is located, available in both intrinsically safe and explosion-proof versions, and can be easily installed on pipelines of various sizes using relevant mounting devices. Installation on existing pipelines does not require hot work permits. The sensor is best installed on the underside of the pipeline to achieve optimal signals in low-flow conditions. The Lightwaves LT 902 series pigging indicator is not affected by flow rates (below 30m/s), so changes in flow rate over time have minimal impact on measurement results. This system requires at least one pair of cables for local lighting or two pairs of cables for detector signal output.

The sensor can also be equipped with an indicator light (which lights up when the pig has passed) and a reset button.

Technical Parameters Sensor

l   Principle: Intelligent Acoustic Sensor

l   Installation: Clamp-on (Non-intrusive)

l   Protection: IP56, IP65, IP66, IP68 (Optional)

l   Ambient Temperature: -40℃ to 60℃ [-40℉ to 140℉]

l   Pipeline Temperature: -40℃ to 150℃ [-40℉ to 300℉]

l   Accuracy: ±2s

l   Power: 24VDC@2.8W, 110/240VAC 50/60Hz, Solar, Lithium Battery (Optional)

l   Docking: M20 Aviation Connector, 1/2" NPT

l   Output: 2 Alarm Relays, 4-20 mA/0-20 mA Analog, RS-232, RS-485 (Modbus RTU, Profibus Protocol)

l   Alarm Indication: Relay, Local Light, External Light, MCS, 4-20 mA, via RS485 connection to Modbus

l   Material: 316 Stainless Steel

l   Weight: Ex ia<3kg, Ex de/m <8kg

l   Software: Windows-based Analysis Testing Software, Embedded (Optional)

l   EPC: Ex db ia [ia IIC Ga] IIB T6 Gb

Controller

Underwater Pigging Indicator