Oil leaks that can occur in factories, plants, infrastructure facilities, etc. pose a direct risk of serious accidents such as environmental pollution, fires, and equipment damage. Oil leak detection is essential to prevent these risks and maintain safe business activities.
This article provides a comprehensive explanation of everything from the importance of oil leak detection to the various types and mechanisms of detectors, specific uses, and how to install and operate them.
Oil leak detection is a general term for the technology and activities that use sensors and systems to quickly find and detect “oil leaks” that occur when oil leaks from storage locations or flow paths. This is carried out in factories, plants, infrastructure facilities, commercial facilities, and any other places where oil is used or stored, for the purposes of protecting the environment, ensuring safety, and avoiding economic loss.
Oil leak detection is not just about finding oil leaks, but is an essential process for preventing the enormous risks that lie ahead. Oil leaks can have serious impacts on the environment, endanger human life and equipment, and cause economic and social losses for companies.
Prevention of environmental pollution
Oil spills cause significant effects on the natural environment, including soil, groundwater, rivers, and oceans. Spilled oil can seep into the soil, inhibiting plant growth and contaminating groundwater, threatening drinking water sources. Furthermore, if it spills into rivers or oceans, it can kill aquatic organisms and disrupt the balance of the entire ecosystem.
Avoiding risks to human life and equipment
Leaked oil dramatically increases the risk of fire and explosion. In particular, when it comes to flammable liquids such as gasoline, kerosene, and diesel, even a slight spark or static electricity can lead to a major accident, threatening not only human lives but also causing catastrophic damage to surrounding facilities and equipment.
In addition, oil leaking onto the floor can create a slippery environment, posing a risk of workers falling.
Minimizing economic losses
Oil spills cause a wide range of economic losses to companies. Not only visible losses, but also invisible losses that affect business activities in the long term. Early oil spill detection is crucial to minimize these losses.
Oil leak detectors are important devices for early detection of oil leaks and reducing the risk of environmental pollution and accidents. There are a wide variety of detection principles, and the optimal method varies depending on the installation environment, the type of oil to be detected, and the required accuracy. They can be broadly divided into “contact types” that detect oil by coming into direct contact with it, and “non-contact types” that detect the presence of oil from a distance.
Principle of contact oil leak detector
Contact oil leak detectors detect leaks by detecting changes in the properties of oil when it comes into direct contact with the sensor. Many of these detectors utilize the differences in the physical and electrical properties of water and oil, making them relatively simple and highly reliable.
The main types and principles of contact oil leak detectors are as follows:
* Float type
Taking advantage of the difference in specific gravity between water and oil, when the float rises due to the buoyancy of the oil, the switch is activated and a leak is detected.
It is relatively inexpensive and has a simple structure. It is suitable for detecting oil films in oil-water separator tanks and pits.
* Conductive type
This utilizes the difference in electrical conductivity (resistance) between water and oil. When oil comes into contact with the sensor, the resistance changes, which is detected.
It is effective for detecting oil films in water and wastewater that has oil mixed in. Care must be taken to prevent the electrodes from becoming dirty.
* Photoelectric type (Transmission/Reflection type)
This method utilizes the properties of oil, such as its ability to absorb light and change its refractive index, and determines whether oil is present by measuring the changes in the amount of light transmitted or reflected.
It is capable of highly accurate detection and tends to be less affected by the type of oil. It is also used to monitor the oil concentration in water tanks and pipes.
* Immersion type (Adsorption expansion type)
The sensor uses a special material (e.g., a polymeric water-absorbent resin) that expands when it absorbs oil. When the material absorbs oil and expands, the change in volume is detected mechanically or electrically.
It may have high selectivity for certain oil types. Once oil is adsorbed, the sensor may need to be replaced.
Principle of non-contact oil leak detector
Non-contact oil leak detectors detect the presence of oil from a distance by capturing changes in physical phenomena such as light and sound waves, without the sensor coming into direct contact with the oil. They are suitable for wide-area monitoring and detection in dangerous locations.
The main types and principles of non-contact oil leak detectors are as follows:
* Infrared type
This technology utilizes the property that oil absorbs infrared rays of specific wavelengths, and detects changes in the reflectance and absorption rate of infrared rays irradiated onto the water surface or ground to determine whether oil is present.
It is effective for detecting oil slicks over a wide area and is used for early detection of oil floating on the water surface. It can also be used at night or in places with poor visibility.
* Ultrasonic
This technology utilizes the difference in ultrasonic propagation speed and reflection characteristics between oil and water, and detects oil layers from changes in the transmission and reception time of ultrasonic waves and the intensity of reflected waves.
It is suitable for measuring oil droplets in water and the thickness of the oil layer in an oil-water separator. It has the advantage of being less affected by turbidity and color.
* Laser type
A laser beam is irradiated onto the target object, and the oil is detected by capturing the fluorescence phenomenon and changes in scattered light. Some types of oil emit fluorescence.
It is capable of extremely high-precision detection, even for minute amounts of oil, and is characterized by its fast response speed.
* Image analysis formula
Images of the water surface and ground taken by surveillance cameras are analyzed in real time. Image processing technology is used to identify changes in light reflection patterns, color, and movement that are characteristic of oil slicks, and to detect oil leaks.
It can visually monitor a wide area and is easy to integrate with existing surveillance camera systems. It requires advanced algorithms to reduce false positives.
Introducing an oil leak detection system is not just about installing detectors; it should be viewed as a series of processes from planning to selection, installation, operation, and maintenance.
To build an effective system, it is extremely important to have a detailed understanding of the target oil type and the characteristics of the installation environment, and to select the appropriate detector. Proper maintenance after installation is also important.
Key points for selecting an oil leak detector
When selecting an oil leak detector, it is essential to comprehensively evaluate its performance, functionality, and compatibility with the installation environment. The main selection points are listed below.
* Detection target substance
The type of oil to be detected (crude oil, heavy oil, lubricating oil, insulating oil, etc.) must be considered, along with its physical and chemical properties such as viscosity, specific gravity, and conductivity. It is also important to consider whether the oil is water-soluble or water-insoluble, and whether it is flammable.
* Detection accuracy and response speed
We will check whether minute leaks can be detected early and what the response time is from the occurrence of a leak to the issuance of an alarm. Early detection is directly linked to preventing damage from spreading.
* Durability and maintainability
Check whether the detector can withstand environmental factors such as temperature, humidity, dust, vibration, corrosive gas, electromagnetic noise, etc. In particular, if installing in an explosion-proof area, it is necessary to select a detector with an explosion-proof structure.
* Alarm and communication functions
How an alarm will be issued when an oil leak is detected (color, sound, light, email, SMS, etc.) and whether it can be integrated with existing monitoring systems. Compatibility of communication protocols is also important.
* Cost
We evaluate the total cost, including not only the initial installation cost but also the running costs (electricity bills, consumables, maintenance costs).
Installation environment and detection target
To maximize the effectiveness of an oil leak detection system, it is essential to have a thorough understanding of the installation location and the characteristics of the object to be detected, and then determine the appropriate detection method and placement.
In addition to considering the installation environment, it is important to consider whether the detector is installed indoors or outdoors, whether it is subject to temperature changes, ultraviolet rays, wind and rain, and whether it is installed in an explosion-proof area. In locations where flammable gases are present, be sure to select a detector with explosion-proof certification and install it appropriately.
In addition to the characteristics of the oil to be detected, it is also important to specifically anticipate where and how it will leak. Identify high-risk areas such as pipe joints, valves, pump seals, and tank bottoms. Predict the route of diffusion of leaked oil (soil seepage, inflow into drainage ditches, etc.) and determine the type of detector (contact or non-contact) and installation location. If there is a risk of groundwater contamination, fluctuations in the groundwater level must also be taken into consideration.
Oil leak detection is essential for preventing serious accidents such as environmental pollution, fires, and explosions, and for minimizing economic losses to companies.
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