In-Line Inspection Tool Explosion Protection via Pressure-Controlled Power Switching
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Solution Overview
Problem
Existing methods for protecting in-line inspection tools during gas pipeline inspections fail to ensure explosion safety, particularly in areas where gas-air mixtures can form, and do not effectively manage power supply to prevent unauthorized activation of flaw detectors in explosible environments.
Innovation Solution
The method involves disconnecting the instrument compartment power supply during air displacement in the launching trap, connecting it only when the pressure exceeds 3 atm to ensure a gas-only environment, and using an onboard computer to control a low-frequency electromagnetic transmitter for safe operation mode signaling, ensuring the power supply is disconnected before potentially explosible conditions arise in the receiving trap.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If power supply is interrupted only when ambient pressure is negative, then the flaw detector is protected from explosion in vacuum conditions, but the flaw detector remains vulnerable to explosion when gas-air mixture pressure exceeds atmospheric pressure during launching trap operations
Solution Approach 1:
The patent changes the pressure threshold parameter for power supply control from negative pressure only to include both negative pressure and positive pressure conditions above atmospheric pressure. The pressure control device monitors ambient pressure and controls the power supply switch to interrupt power when pressure deviates from atmospheric pressure in either direction, thereby preventing explosions in both vacuum and pressurized gas-air mixture conditions.
2Ease of operation
If power supply is continuously provided to flaw detector instruments, then the instruments can operate normally for detection, but unauthorized power supply creates explosion risk in the presence of gas-air mixture in the launching trap
Solution Approach 1:
The patent implements a feedback control system where the pressure control device continuously monitors ambient pressure conditions and provides feedback to the power supply switch. Based on this feedback, the switch automatically interrupts or restores power supply to the flaw detector instruments, ensuring power is only provided when it is safe to do so (when pressure conditions indicate absence of explosible gas-air mixture).
Solution Approach 2:
The system performs preliminary action by interrupting power supply before the flaw detector is exposed to potentially explosible conditions in the launching trap. The pressure control device detects pressure changes indicating gas filling and preemptively cuts power to prevent unauthorized operation during dangerous conditions, then restores power only when safe operating conditions are confirmed.
3Object-affected harmful factors
If residual air is completely removed from the launching trap before gas filling, then explosion safety is improved, but the time required for trap preparation and the complexity of the process increases
Solution Approach 1:
The patent replaces mechanical/process-based explosion prevention (complete air removal through multiple pumping cycles) with an electronic control system. The pressure control device with automatic power supply interruption provides electronic safety control that allows gas filling to proceed without requiring complete preliminary air removal, thereby reducing preparation time while maintaining explosion safety through automated power management.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach significantly enhances explosion protection by ensuring the power supply is only active in safe conditions, preventing unwanted gas-air mixture explosions and providing real-time operational status of the tool through signal modulation, thus ensuring the tool's safe operation and preventing hazardous situations.
Implementation Method 1
Transmitter PNT generates a magnetic field pulsating with the low frequency of 22 Hz. This signal passes through metal pipeline walls, soil or water above a pipeline, as well as through a reinforced concrete floor.
Data Source
Figure 1
AI summary
The invention relates to methods for non-destructive testing technology field and used for increasing the efficiency of protecting the in-line inspection tool against explosion while the flaw detection in trunk gas pipelines. Method for the explosion protection of the in-line inspection tool consists in connecting of the instrument compartment power supply circuit of the in-line inspection tool to the power supply unit at the pressure guaranteeing the absence of the explosible gas mixture in the receiving trap, and also additionally monitor the instrument compartment power supply and execution by onboard computer. The system device for protecting the in-line inspection tool from the explosion provides the connection and disconnection of the instrument compartment power supply circuits at a pressure guaranteeing the absence of the explosible gas mixture in the launching (receiving) trap, and lets with the help of the signal acquirement from the low-frequency electromagnetic transmitter, located on the tool, monitor the execution of normal operation modes by the tool.