Magnetic Reed Switch Retrofit for Oil Field Hatch Closure Detection
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Solution Overview
Problem
Oil field thief hatches pose challenges in monitoring their closed state due to remote locations and the need for labor-intensive manual inspections, with existing monitoring options being expensive and difficult to install, leading to costly fines for improperly closed or open hatches.
Innovation Solution
A non-contact lid sensor system using a reed switch and magnetically embedded latch pin, allowing for simple installation and monitoring of the hatch's closed state, with the option to retrofit existing lids, ensuring accurate detection of the hatch's latched position without physical contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual inspection is used to check hatch closure, then the closure state can be determined, but the process becomes time-consuming and labor-intensive
Solution Approach 1:
The patent replaces manual mechanical inspection with an automated magnetic sensing system. A magnet embedded in the latch pin interacts with a reed switch sensor mounted on the tank body to automatically detect and signal the closure state, eliminating the need for manual visual inspection and providing continuous monitoring capability.
2Extent of automation
If custom software sensing systems are used for monitoring, then automated detection is achieved, but the system becomes extremely expensive and hard to install
Solution Approach 1:
The patent employs inexpensive, simple components - a magnet embedded in the latch pin and a reed switch sensor - instead of expensive custom software systems. These basic magnetic sensing elements provide reliable automated detection at minimal cost with straightforward installation, making the system economically viable for widespread deployment.
Solution Approach 2:
The patent uses a magnetic field as an intermediary between the mechanical latch and the sensing system. The magnet embedded in the latch pin creates a magnetic field that actuates the reed switch sensor, providing a simple intermediary mechanism that translates mechanical closure state into an detectable signal without requiring complex electronics or software.
3Measurement precision
If the magnet is positioned to trigger the reed switch, then the sensor detects the closed state, but the 0 Gauss line must be avoided to prevent false signals
Solution Approach 1:
The patent applies local quality by creating a non-uniform magnetic field distribution through strategic magnet positioning. The magnet is placed and oriented such that its 0 Gauss line (neutral point) is positioned away from the reed switch sensor, ensuring that the sensor only experiences magnetic field strength during actual closure events. This localized field configuration provides reliable detection while avoiding false signals from the neutral zone.
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
The sensor system effectively and efficiently monitors the closure of oil field thief hatches, reducing the risk of fines by providing a reliable and cost-effective means to ensure hatches are properly latched, even in remote locations, through a simple and easy-to-install solution.
Implementation Method 1
A magnet is embedded in the pin and oriented with its magnetic poles parallel to the longitudinal axis of the pin
Implementation Method 2
The sensor is a reed switch positioned perpendicular to the front face of the sensor and to the longitudinal axis of the pin
Implementation Method 3
The sensor system also allows for a Hall effect sensor to be used
Data Source
AI summary
A non-contact lid sensor is provided for use with an oil field thief hatch and a latch. The sensor is mounted to the latch and comprises a reed switch. The latch pin is removed and embedded with a magnet with the magnet's north-south poles parallel to the pin's length so that the magnet triggers the reed switch. The reed switch is oriented so that it is perpendicular to the lower latch pin and the face of the sensor. The magnet and reed switch are aligned so that when the lid is closed the reed switch never sees the 0 Gauss line of the magnet. When the latch is in a closed position the reed switch allows the current to pass through the sensor and signal that the hatch is closed. The sensor system also allows for a Hall effect sensor to be used.