It is something that is indispensable for gas pipelines.
The pipeline has not only straight sections but also bends and branching parts. The guide plate that ensures a smooth passage for the pig without getting caught on the branching side when it passes through this branching part is called a guide bar (pig bar). At Benkan Kiko, we manufacture elbows used in the bending parts of the pipeline and T (tee) fittings used in the branching parts, but we refer to a T fitting with a bar attached to the branching part as a T fitting with a guide bar. Regarding the guide bar, there are various know-how related to its shape and installation method, and the welding to the T fitting body often needs to be performed using a welding method (welding construction method) that has been approved based on regulations such as the Gas Business Act. Benkan Kiko has obtained many welding construction methods based on regulatory requirements such as the Gas Business Act and the Electric Utility Act, allowing us to respond to various cases. In addition to being able to accommodate various shapes of guide bar installations according to customer requests, we can also procure the materials for the guide bars ourselves. Furthermore, we are qualified to conduct various tests and inspections on the welded parts of the guide bars. Source of pig photo: JFE Engineering Corporation.
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basic information
One of the essential things in our lives is "city gas." The pipes used to transport and distribute city gas are called "conductors," and they are categorized into main pipes, supply pipes, and internal pipes depending on their installation location. Additionally, they are broadly classified into high-pressure, medium-pressure, and low-pressure pipes based on the pressure of the gas flowing inside them. In areas where city gas is utilized, these conductors (main pipes) are spread out like blood vessels, and gas is delivered to each household through further branched (capillary) pipes. Main pipes are generally buried underground, and over many years of use, issues such as corrosion, deformation, or positional shifts due to ground subsidence can occur. Therefore, regular inspections are necessary to keep these conductors (blood vessels) in good condition. To conduct these inspections, there is a device called an "inspection pig." This device has a piston-like shape and consists of multiple connected units that serve the purpose of cleaning, inspecting for corrosion, and detecting position as it moves through the piping system. There are also pigs designed to confirm the passability of the inspection pig, making it a very deep and interesting technology.
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Applications/Examples of results
It is used in the gas pipelines of various gas companies.
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From residential water supply and hot water piping to massive pipelines in large-scale plants, piping that supports daily life is spread all over the world. Benkan Kiko Co., Ltd. is involved in the manufacturing of welded pipe fittings, which are essential piping components. We provide optimal products tailored to the piping environment (design, usage conditions, etc.) and construction circumstances, not only for general building water supply and hot water piping but also for power plants, gas plants, refineries, oil and chemical plants, shipbuilding, and more, where strict quality standards are required.