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Distributed fiber optic pipeline leak detection – Raman fiber optic temperature sensor, supplier, manufacturer, factory

Pipeline monitoring is a specific practical case of distributed fiber optic temperature measurement application. FJINNO provides fiber optic temperature measurement technology solutions and products.

Transportation is a transportation technology that utilizes pipelines to transport fluids such as gases and liquids. In recent years, this technology has developed rapidly and has been widely used in fields such as energy, municipal construction, and water conservancy irrigation due to its advantages of large transportation volume, small land occupation, short pipeline transportation construction cycle, and low cost. It has become the main transportation mode for land water, oil, and gas, and is one of the five major transportation modes in the world today, along with railways, highways, water transportation, and air transportation. It plays a crucial role in national economic and social development.

The method of real-time pipeline monitoring system

In practical engineering applications, pipelines are often buried underground and have long distances. Pipelines buried underground for a long time are susceptible to external forces such as corrosion from the surrounding environment, geological subsidence, ground vehicle pressure, and human damage, leading to leakage accidents. Ensuring the safety of pipeline transportation is a fundamental requirement for maintaining the normal operation of pipelines. Therefore, real-time monitoring of the health status of transportation pipelines is necessary to ensure the safe operation of the pipelines. Traditional pipeline leak detection methods include manual inspection, balance method, negative pressure wave method, and stress wave method, etc. These methods are all used to detect leaks in pipelines or after they occur, which have disadvantages such as difficult positioning, short distance, high cost, and no warning function. In recent years, new sensing technologies using optical fibers as sensing elements and transmission media have overcome the shortcomings of traditional technologies and provided a new approach for pipeline leakage detection. Based on the advantages of corrosion resistance, light weight, small size, no need for electricity at each sensing point, immunity to electromagnetic interference, high sensitivity, and the ability to achieve distribution, distributed fiber optic sensing systems have become the most widely used and promising technological means in the field of pipeline detection in China.

In practical engineering, transportation pipelines generally pass through complex and diverse terrains, passing through mountains, valleys, railways, highways, etc. The distributed fiber optic sensing system laid along the pipeline can provide continuous temperature monitoring for the entire line, achieve ultra long distance sensing monitoring, achieve all-round monitoring of transportation pipelines, and ensure the safe operation of the pipeline.

The distributed fiber optic sensing system can be divided into three types based on different fiber optic temperature measurement principles:

1. Distributed Rayleigh fiber optic temperature sensor
2. Distributed Raman fiber optic temperature sensor
3. Distributed Brillouin fiber optic temperature sensor

Since the successful development of a distributed Raman fiber temperature sensor experimental device using a semiconductor laser as the light source, the distributed Raman fiber temperature sensing technology has continuously developed and is in a mature stage in engineering. A large amount of saline water is generated during the construction of an underground gas storage in a certain area, and the saline water needs to be transported to a designated location for treatment. This project uses a pipeline leakage system to detect the saline water transportation pipeline. The optical fiber is buried in sand 10 cm below the pipeline, and temperature data is collected using two collection devices in series. Every 30 minutes, the collection devices transmit the data to the central control computer for data analysis and generate an alarm when a leak is detected. The system can automatically send an alarm, generate a report, regularly reset and restart the measurement, and requires almost no maintenance.

Using fiber optic sensing technology for oil simulation leakage testing, detecting changes in soil temperature around the pipeline based on Raman scattering and Brillouin scattering principles, in order to determine the location of the leakage point. Using temperature sensors and fiber arrays to collect changes in soil temperature, leakage testing was conducted on high-pressure natural gas in underground pipelines. The variation law of soil temperature around the leakage hole was studied, and combined with numerical calculations, the most realistic leakage model was established to provide guidance for fiber temperature detection of gas pipeline leaks.

The application of distributed fiber optic temperature measurement technology in various fluid transportation pipeline leak detection fields has enormous potential. This paper discusses and analyzes the application of distributed fiber optic temperature measurement system in pipeline leakage detection from the aspects of its characteristics, working principle, fiber optic laying method, and practical application case analysis. The working principle of distributed Raman fiber optic temperature measurement system combines Raman scattering and time-domain reflection technology of light in the fiber optic,



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