Popper Pig Indicators In Pipelines 
Description
An Intrusive Type Pig Signaller detects the passage of a pig—the tool used for cleaning or inspecting pipelines—as it travels along the pipeline. Here’s a detailed look at its design, functionality, and applications:
Design:
Intrusive type pig signallers are mechanically operated devices that operators install directly into the pipeline wall. They typically consist of a body housing a trigger mechanism, which extends into the pipeline through a fitting. The passing pig physically displaces this trigger.
Functionality:
Detection Mechanism: The core component of an intrusive pig signaller is the trigger mechanism which protrudes into the pipeline. As a pig passes by, it makes contact with the trigger, activating the device.
Signal Transmission: Upon activation, the signaller can transmit a visual signal, such as a flag indicator, and/or an electrical signal to a remote monitoring system. This helps operators confirm that the pig has passed a specific point in the pipeline.
Resetting: After detecting a pig, the mechanism needs to be manually or automatically reset to be ready for the next pig pass.
Advantages of Pig Signaller
Intrusive signallers, due to their direct contact with the pig, provide a highly reliable method for detecting pig passages. These signallers also offer versatility as they can work in various types of pipelines and with different pig designs, including foam, batching, and intelligent pigs.
Applications of Pig Signaller
Operational assurance is crucial as it confirms pigs have passed critical points, ensuring the effectiveness of pigging operations. Additionally, by confirming the passage of cleaning pigs, operators maintain pipeline efficiency and prevent buildup and potential blockages. For safety monitoring, it is vital to know the location of utility pigs in pipelines carrying hazardous materials. This knowledge is especially critical when pigs separate different product batches.
Considerations:
Intrusive type signallers require a pipeline fitting for installation and may necessitate shutdowns for maintenance. You must meticulously seal and reinforce the installation to prevent leaks, as the device penetrates the pipeline wall. Despite these challenges, intrusive type pig signallers are essential tools. They provide robust and reliable detection capabilities critical for the safe and efficient transport of oil, gas, and other substances.
Configuration parameter | |||
| ●standard configuration | ○Optional configuration | — No | |
| Trigger type(b-bidirectional /f-bidirectional feather /u-u-unidirectional) | ○/○/● | ||
| Flag trigger interagency interaction (no / Yes _ the flexibility of the trigger mechanism can be checked online) | —/● | —/● | —/— |
| Wetted part material(316L SS/DSS/INCONEL) | ●/○/○ | ||
| Flange/welding base material(PTFE Coated A105N/304SS/316LSS/DSS/INCONEL/According to customers’ needs) | ● /○/○/○/○/○ | ||
| Liquid level position in the machine (high _ requires heat tracing / low _ does not require heat tracing) | —/● | ||
| Output junction box(aluminum alloy /316ss) | —/— | ●/○ | ●/○ |
| Output switch (DPDT/SPDT) | —/— | ○/● | ○/● |
| Switching capacity (DC24V 3A/DC24V 5A) | —/— | ●/○ | ●/— |
| Output interface size (M20 × 1.5(F)/1/2″NPT(F)) | —/— | ●/○ | ●/— |
| Pressurized handling tools(2 full thread studs / synchronous special tools) | ●/○ | ||
| Insertion depth adjustment range (±10mm) | ● | ||
Parameters of Intrusive Pig Signaller
| Type: Intrusive |
| Connection type: Flange connection |
| Indicator feature: Manual reset flag combined with electrical signals (Manual reset flag and Date and time display combined with electrical signals can also be made) |
| Installing type: 2” Flange. As per ASME B16.5(CLASS150-2500) |
| Plug body length: 200mm/Meet the actual needs |
| Insert depth adjustment: 20mm |
| Operating temperature: -20~120℃/Meet customer requirements |
| NACE MR 0175: Yes |
| Ingress protection: IP66 |
| Explosion-proof class: Exd II BT4 |
| Remove under pressure: No |
| Trigger type: Bi-directional (Uni-directional trigger can also be made) |
| Internal part material: PTFE Coated A105N is standard configuration (304SS/316LSS/DSS/INCONEL/As per MR can meet customer needs) |
| Junction box material: Aluminium alloy/316SS |
| Switch type: DPDT/2*SPDT |
| Switch rating: DC24V 3A/DC24V 5A |
Different Indicator Types
| Indicator Types | ||||
| Indicator Types | A | B | C | D |
| Intrusive Type | Intrusive | Intrusive | Intrusive | Intrusive |
| Indicator Features | Popper Type | Manual reset flag | Manual reset flag combined with electrical signals | Date and time display combined with electrical signals |
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