ベンカン機工 List of Products and Services

At Benkan Kiko, we handle a variety of special materials and can supply products made from highly corrosion-resistant duplex stainless steel. If you have any concerns, please feel free to consult with us.

• Fittings
• Sewerage facilities
• Water Supply Facilities

The river water around the Yonago River No. 1 Power Plant in Suzaka City, Nagano Prefecture, has a strong acidity with a pH of 3.23, making it unsuitable for agricultural use and as a habitat for fish. However, in order to effectively utilize resources and contribute to the community while ensuring environmental conservation through profit return, the establishment of a hydroelectric power plant was initiated. In this context, we were approached through the Ipros site, and we had the opportunity to visit the site. We held detailed discussions to propose products that our company could provide. As a result, our extensive delivery track record to power plants, along with our quality and inspection system, as well as our ability to create documentation, were highly evaluated, leading to our adoption. The welded pipe fittings we supplied this time are made of stainless steel, model 90, 45EL, material SUS304W, sizes 600A and 400A, and thickness S10S. We believe that stainless steel, which is highly resistant to corrosion, is essential for the river water with strong acidity used in hydroelectric power plants. In this way, Benkan Kiko's welded pipe fittings are used in various locations.

• Dam construction
• Fittings
• Pipeline Construction

The 3DR elbow is a type of pipe fitting that is commonly used in gas pipelines. It is often manufactured using high-frequency bending, but due to the manufacturing process, an extra length of 1OD (1 outer diameter) is required as a gripping area. However, having this extra length makes it cumbersome during transportation. Additionally, in the case of underground installation, the extra length necessitates deeper excavation during construction, which increases labor costs, including handling. Since many products are used for mainline applications, the impact on costs is considered significant. However, if manufactured using the mandrel method, the absence of extra length improves loading efficiency onto trucks and eliminates the need for deeper excavation during underground installation of the pipeline, making construction easier. Furthermore, the wall thickness of the bend is almost uniform, and the entire elbow undergoes heat treatment, resulting in consistent mechanical properties and high quality, with no discontinuities in wall thickness, making it safe for use in high-pressure conduit mainlines. At Benkan Kiko, we offer 3DR elbows manufactured using the mandrel bending method. We can provide cost-benefit calculations, so please feel free to consult with us.

• Railway Construction
• Power generation facilities
• Pipeline Construction

The product we are introducing this time is an elbow with a rectifying plate. A rectifying plate is a plate that is installed on the inside of pipe fittings such as elbows, and it serves to streamline the flow of fluid passing through the piping. When welding the rectifying plate, it is necessary to consider the bending radius (angle) of both the elbow and the welding plate, which requires a high level of skill. At Benkan Kiko, we have received high praise from our customers by being able to accommodate special products thanks to our high technical capabilities cultivated over many years. We can manufacture in various materials and sizes, so please feel free to contact us first.

• Railway Construction
• Special Construction Method
• Pool equipment related

The photo shows a lateral pipe where the branch pipe is connected diagonally to the main pipe. The connection of the branch pipe requires saddle welding on a curved surface, and since the branch pipe is connected at an angle rather than at a right angle, the connection surface becomes elliptical, which demands a very high skill level from the welder. Additionally, a backing plate (pad) is welded to the main pipe using fillet welding. The backing plate is applied to reinforce the piping branch, and when performing prefabrication or on-site piping, there are concerns that directly welding support materials or foot materials to the product may affect the quality of the main pipe and the qualifications of the welders performing that welding. Therefore, the backing plate is used to address such concerns. The manufacturing of this backing plate also requires high forming skills to match the curved shape of the main pipe, but Benkan Kiko is capable of handling this. At Benkan Kiko, we can supply high-quality products through excellent welding technology and precise forming techniques.

• Joints between components

Compared to welding construction with direct attachment of pipes and flanges, using a stub end incurs higher component costs. However, during on-site installation, it does not require positioning or alignment of bolt holes, making the construction easier and ultimately leading to cost reduction when considered as a whole. At Benkan Kiko, we stock four types of 10k type with materials SUS304, SUS304L, SUS316, and SUS316L. Please feel free to contact us for estimates or inquiries.

• Fittings
• Sewerage facilities
• Water Supply Facilities

Large-diameter welded pipe fittings are typically manufactured from carbon steel plates, alloy steel plates, and stainless steel plates, each from their respective materials. What we would like to introduce this time is a T (tee) welded pipe fitting made from a plate that has a thin steel plate of UNS8825 bonded to WPHY60 steel plate on the inside. In addition to general carbon steel and stainless steel, it is possible to manufacture from a variety of materials, including low alloy steel, high alloy steel, duplex stainless steel, super stainless steel, aluminum, nickel, and high-strength steel. Among these diverse materials, it is also possible to manufacture from clad steel plates, which combine two types of materials. Furthermore, production is also possible from seamless materials or overlay materials that are not steel plates.

• Steel
• Prefab
• stone

The 45° YT product is a pipe fitting used for merging from two directions or branching to two directions. It typically branches at a 90° angle to the main pipe, but it is designed to branch at a 45° angle to ensure smooth fluid flow. When branching the piping at a 45° angle, it is usually necessary to connect a 45° elbow to a 90° branch tee, but by using the 45° YT, branching can be done in a more space-saving manner. This product is used in nuclear power plants and is managed under strict quality control. The available sizes are 50A, 80A, and 100A. For information regarding materials and applicable sizes, please inquire.

• Railway Construction
• Special Construction Method
• others

Steel products are easily corroded when left uncoated in the atmosphere, and rust occurs electrochemically due to oxygen and moisture in the air. It is possible to protect the products from corrosion and aging conditions by applying paint. Steel products used in plants and pipelines are particularly often painted, and at Benkan Kiko, we can supply products that have been painted or coated with customer-specified paints, thereby reducing on-site painting work. For products that do not have special painting instructions, we apply temporary rust prevention that suppresses rust for about six months when stored indoors.

• Special Construction Method
• Prefab
• others

Su (Syu) pipe fittings are thin-walled stainless steel butt-welded pipe fittings (JIS B 2309) that have been reduced in thickness to a level suitable for general piping stainless steel pipes (JIS G 3448 TPD). This thinning allows for lighter piping and cost reduction, leading to a decrease in on-site construction burdens, which has received positive feedback. The material used is often [SUS304WD] since it is for general piping, but in special environments such as buried corrosion resistance, [SUS316WD] may be used. Our company can accommodate both options. The maximum specification pressure is 2.0 MPa.

• Railway Construction
• Special Construction Method
• others

We have the technical skills and experience to accommodate various ship classifications, and we respond not only to the specifications required by classification societies but also to a wide range of additional requests tailored to our customers' needs.

• Railway Construction
• Special Construction Method
• others

This product is a special reducer for gas operators. Traditionally, it was manufactured by welding various parts together, but this product is made solely through plastic processing based on our expertise in metalworking technology, resulting in a seamless shape without the use of welding. Its features include long straight pipe sections on both the large diameter and small diameter sides, with holes created on both sides of the large diameter side through bar-rolling processing. By eliminating the welding process, we have achieved cost reduction and shortened delivery times.

• Railway Construction
• Special Construction Method
• others

In the variety of welded pipe fittings, elbows, tees, and reducers are common, but fittings that have branches on both the top and bottom, resembling a cross shape, are referred to as "crosses" due to their cross-like appearance. These are pipe fittings not specified by JIS, and most are manufactured by machining from forged materials. However, Benkan Kiko is capable of producing them using the bulging method (hydraulic forming) from seamless pipes. The machining method tends to result in heavier weights and often produces angular shapes, which can make welding on-site difficult, according to some feedback. Additionally, the machining process from a solid block requires a significant amount of material, leading to higher material costs and increased processing costs. On the other hand, manufacturing through forming from seamless pipes achieves smooth shapes, uniform wall thickness, and lighter product weights, while also enabling cost reductions. This cost advantage becomes more pronounced with high-cost materials such as stainless steel and non-ferrous metals like nickel, resulting in significant benefits. For more details, please feel free to consult our sales office.

• Railway Construction
• Special Construction Method
• others

The product we are introducing this time is the NBG joint, which has undergone cutting processing on its zinc plating. When performing the peeling work of the zinc plating attached to the groove section, leaving any residue and then proceeding with welding can lead to the generation of harmful substances due to the heat effects during welding. Therefore, there is a concern about the generation of harmful substances, and the peeling work creates a burden and hassle on-site. The NBG joint is a welded pipe joint from which the zinc plating attached to the groove section has already been removed through cutting processing. As a result, it eliminates the need for the peeling work process before performing the surrounding welding, alleviating concerns during the welding process and improving work efficiency. The NBG joint is primarily used in air conditioning equipment that creates a comfortable living environment and is active in various fields such as large building facilities and commercial establishments. Please consider the NBG joint, which can eliminate the peeling process and reduce concerns about harmful substance generation as well as the burden and hassle of peeling work. NBG stands for "Non Bevel Galvanized," a unique expression of Benkan Kiko.

• Water Treatment
• stone
• District heating and cooling/heat source system

"Non-ferrous metals" refer to metals that are different from "carbon steel," "alloy steel," and "stainless steel," and include types such as "aluminum alloys" and "nickel alloys." Benkan Kiko manufactures welded pipe fittings made from "non-ferrous metals," which are difficult to control in shaping, utilizing the metal plastic processing technology cultivated over many years, and has a wealth of delivery achievements. Additionally, by leveraging various material procurement sources developed over time, we have established a system that can support customers' piping designs by accommodating a wide variety of steel types. We can also handle many other materials, including "Inconel," "Hastelloy," and "Monel," so please contact us for more details. We also introduce "non-ferrous metals" on the Benkan Kiko blog, so please take a look.

• Railway Construction
• Special Construction Method
• others

Please be sure to use Benkan Kiko's aluminum alloy butt-welded pipe fittings around the tanks for LNG carriers. Benkan Kiko has obtained qualifications from many classification societies and is capable of manufacturing elbows, tees, reducers, caps, as well as sleeves and bell mouths through a combination of plastic processing and welding. We are compliant with the following classification societies: 1. Nippon Kaiji Kyokai (NK) 2. Bureau Veritas (BV) 3. Lloyd's Register (LR) 4. American Bureau of Shipping (ABS)

• Rock drills, demolition machines, and excavators
• stone

Clad steel is a composite material that uses carbon steel, high-strength steel, low-alloy steel, etc., as the base material, and combines it with a different type of steel on one side through processes such as hot rolling (bonding), welding, or explosive bonding. It allows for the joining of dissimilar metals, enabling the creation of functions that cannot be achieved with a single metal. By combining materials with good corrosion resistance or by using less expensive metals in larger quantities alongside more expensive ones, it is also possible to reduce the overall cost of piping. This type of steel provides advantages in various cases, such as accommodating rare materials or materials that can only be purchased in thin sheets. *The photo shows a cross-section of clad steel, where the combination of dissimilar metals can be seen.

• Steel
• Prefab
• stone

Are you thinking, 'It's impossible because stainless steel piping is too expensive'? By using stainless steel for fire protection piping, you can extend the lifespan of the piping system due to the corrosion resistance characteristic of stainless steel compared to carbon steel. Additionally, the strength of stainless steel allows for thinner piping, enabling space-saving designs. In the case of stainless steel, the weight of the piping can be reduced by about 70% compared to carbon steel, making its strength and space-saving benefits easy to understand. This also brings advantages in reducing on-site labor costs. Benkan Kiko's pipe fittings (Su fittings) are approved for use under fire protection laws and have obtained JIS certification (JIS B 2309). The trusted brand Benkan Kiko, which is used not only for fire protection systems but also for general piping stainless steel, will assist you in converting fire protection piping to stainless steel. In March 2020, the ordinance revising part of the "Ordinance on Water Quality Standards" was promulgated, which revised the amount of hexavalent chromium compounds. Our company has conducted leaching performance tests under the new standards, and our Su fittings meet the revised water quality standards.

• Fire extinguishing equipment
• Prefab
• others

Are you having any difficulties with the requirements for JSME application? If you have quality management requirements for JSME application but are unsure how to proceed, what kind of management is necessary, how to manage measuring instruments, what is traceability management, how to create quality records, what welding methods are required if welding work is necessary, who the welders are, and other various concerns, please feel free to consult with us.

• Piping Equipment
• Subsidiary materials

At Benkan Kiko, we provide high-quality products in response to customer requests, including butt-welded pipe fittings, the manufacturing of welded steel pipes, and piping prefabs, thanks to our long-established management system for piping products (materials, welding, manufacturing processes, and quality assurance). ■ Welded Steel Pipes 　➢ Manufacturing Range 　　・Diameter: 400A (16B) to 1200A (48B) 　　・Wall Thickness: Up to 90mm (max.) 　　・Length: Short pipes up to 8,000mm (8000L) 　➢ Recommended Points 　　・No lot restrictions; we can manufacture from a single piece. 　　・Short pipes and random lengths can be produced. 　　・We can accommodate specified bevel shapes and special tolerances (prior consultation required). ■ Piping Prefab 　➢ Spoolable Range 　　・Spool Dimensions: 9000(w) x 2350(d) x 2000(h) 　➢ Recommended Points 　　・We offer centralized management through a single point of contact for welded steel pipes, pipe fittings, and piping prefabs. 　　・The quality of welded joints can be maintained at the same level due to the same construction method.

• Special Construction Method
• Prefab
• others

At Benkan Kiko, we manufacture large diameter seamless pipe fittings connected to seamless steel pipes with an outer diameter exceeding 16 inches, utilizing our long-established plastic processing technology and quality assurance system. We can also accommodate various materials, including low alloy, high alloy, high strength steel, and stainless steel.

• Railway Construction
• Prefab
• stone

It is a joint that makes you think it could be a sculpture, finished to a stunning degree. This is made by "cutting out," which means it is created by machining from forged material, not through plastic processing. Among the welded pipe joints used in boiler-related applications at thermal power plants, there are products with large and special shapes that cannot be made through plastic processing (stretching, compressing, bending, or pulling steel materials). For such requests, we manufacture by cutting from forged materials rather than using conventional plastic processing. The shapes mainly include Y-PIECE, which branches at the same angle from one direction; LATERAL, which branches at an angle like a branch from one direction; and T-PIECE, which branches in a T shape. The diameters primarily range from 400 to 800 mm, with some larger ones weighing around 10 tons. Since these products are used under extremely harsh conditions, the specifications include strict component regulations for the materials used and heat treatment conditions based on the technical standards for power generation thermal equipment. Not only do the shapes need to fit, but we also conduct UT tests on the materials, tensile tests, impact tests, hardness tests, and penetration tests on the products, and we provide the final products only after all tests are cleared.

• Steel
• Secondary steel products
• Railway Construction

A lateral is a welded pipe fitting that generally branches off at a diagonal direction in a Y-shape from the side of the main body. Although it is too thick and has a special shape to be called a "pipe," we have a wealth of sales experience with such specialized products. At Benkan Kiko, we accommodate various shapes of products according to our customers' needs.

• Joints between components

■Content■ Hydraulic bulging method (hydraulic forming method) - You can watch a video of the forming method for tees. Please click the link below the "Contact Us" button to access the homepage with the video explaining the hydraulic bulging method (hydraulic forming method).

• Metalwork
• others

At Benkan Kiko, we leverage our advanced welding technology to consistently undertake piping prefabrication work and the manufacturing of welded structures. We are capable of performing welding related to regulations such as the Electricity Business Act (nuclear and thermal) and the Gas Business Act, allowing us to contribute to the efficiency and cost reduction of your operations through centralized management from material procurement to application. Please feel free to consult with us first.

• Joints between components
• Prefab
• others

■Content■ You can watch a video on the manufacturing method of seamless reducers for piping using the steel pipe outer die method. Please click on the 'Related Links' below the contact button.

• Metalwork
• Special Construction Method
• others

The material commonly referred to as duplex stainless steel is characterized by its high resistance to corrosion, as well as its greater strength compared to austenitic stainless steel. This allows for thinner design plate thicknesses, leading to advantages such as weight reduction, downsizing due to increased flow rates, and cost reduction in piping. At Benkan Kiko, we utilize our long-established metal forming technology and quality assurance system to provide high-quality duplex stainless steel welded pipe fittings, assisting our customers with their piping design and cost reduction. Please feel free to contact us with any questions or inquiries. Project Sales Department, Eastern Japan Sales Division TEL: (03) 3777-1521 / FAX: (03) 3777-1567 Project Sales Department, Western Japan Sales Division TEL: (06) 6482-1581 / FAX: (06) 6482-1824

• Prefab
• others
• stone

Our "Welded Pipe Fittings" are manufactured in JIS-certified and ISO9001-certified factories, and are actively used in a wide range of fields from infrastructure to civilian applications, including thermal power generation, geothermal power generation, oil refining, city gas, waste incineration plants, water purification plants, construction, pharmaceutical plants, shipbuilding, papermaking, and nuclear power generation. Using the metal plastic processing technology and welding technology we have cultivated over many years, along with our quality assurance system, we provide high-quality products and assist with piping design and cost reduction. ★ We are currently offering a "Comprehensive Catalog with Dimension Tables" that includes a rich lineup of welded pipe fittings for download! [Contents of the Comprehensive Catalog (partial)] ◎ Types of welded pipe fittings ◎ Dimensional tolerances for welded pipe fittings ◎ Dimension tables for welded pipe fittings Elbows (long, short / large diameter elbows (long, short) T (same diameter, different diameter) / large diameter T (same diameter, different diameter) Reducers (concentric, eccentric) / large diameter reducers (concentric, eccentric) Caps / stub ends (lap joints)

• Railway Construction
• Special Construction Method
• others

The photo shows the PT test (penetrant testing) being conducted on welded pipe fittings. Penetrant testing is a type of non-destructive testing that is performed without causing physical damage to the product or test piece, and it is used to detect defects that are difficult to see visually on the surface of the product. (This testing method only targets the detection of surface-open defects.) *The color in the photo below (detailed information section) is a sample.

• Rock drills, demolition machines, and excavators
• Non-destructive testing
• Prefab

At Benkan Kiko, we manufacture joints made from nickel-based alloys, which are difficult-to-form materials, utilizing our long-established metal plastic processing technology, and we have many achievements in this area. Nickel-based alloys are used as heat-resistant and corrosion-resistant materials, and due to their high strength, they are also suitable for use in high-temperature environments. The nickel-based alloy joints that can be manufactured at Benkan Kiko include the following steel grades: ASME UNS NO N10276, N06022, N10655, N06210, N02200, N02201, N06625, N08020, N06002, N06601, N06230, N08800, N08810, N06600, N08825, N06690.

• Prime movers, torque converters, hydraulic equipment, generators
• Prefab
• others

In the field of plants where piping is installed, welding of pipe fittings to pipes and welding of pipe fittings to pipe fittings must often be carried out using approved welding methods (welding construction methods) based on regulations such as the Gas Business Act. Since there are many types of welding construction methods depending on the material of the pipe and the welding method, it is not always possible to accommodate all sites. Therefore, by pre-welding short pipes at Benkan Kiko, it becomes possible to align with the welding construction methods that can be used on-site. 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. Additionally, we can accommodate various shapes for guide bar installation according to customer requests, and we also offer the option to purchase materials for guide bars and sleeves from our company. We are qualified to conduct various tests and inspections on the welded parts of sleeves and guide bars, so please feel free to contact us first.

• Railway Construction
• Special Construction Method
• others

At Benkan Kiko, we provide high-quality products by manufacturing them using our long-established welding technology and quality assurance system, assisting our customers in achieving cost reductions in their plant piping design. The product we are introducing this time is a super-large diameter welded pipe fitting exceeding 48 inches (1200A).

• Railway Construction
• Prefab
• stone

The product we are introducing this time is welded steel pipes for piping. When manufacturing pipes, there are often limitations on the production lot size and minimum length. However, at Benkan Kiko, we can accommodate customer requests for standard lengths such as 4000L, 5500L, and 6000L, as well as shorter sizes under 1M and intermediate lengths known as random lengths, along with the construction of end preparations. Regarding welding construction, we can also handle welding work based on regulatory requirements such as the Electric Utility Industry Law, Gas Utility Industry Law, boilers, and first-class pressure vessels. For products subject to the Electric Utility Industry Law, we can provide welding methods and quality assurance through certified welders that comply with inspections for welding contractors, contributing to cost reduction for our customers through the preparation of documentation related to inspections and factory audits. Additionally, further cost reductions can be achieved by performing circumferential welding of joints and pipes together.

• Railway Construction
• Prefab
• stone

Benkan Kiko is conducting online sales with the cooperation of Misumi Corporation. Anyone can purchase from a single unit. The products available are as follows: [Benkan Kiko Co., Ltd. Welded Pipe Fittings] - Elbows, tees, reducers, caps / made of steel (white and black FSGP and Sch pipes) - Elbows, tees, reducers, lap joints / made of stainless steel You can purchase at any time, so please take advantage of this opportunity.

• Water Treatment
• Water and sewerage pipe fittings
• stone

Su joints (JIS B 2309) are manufactured primarily for use in general water supply and hot water piping in hotels, apartments, hospitals, building construction, and factory piping. They are characterized by being thinner than butt-welded pipe fittings produced according to JIS B 2311 and JIS B 2312, which allows for cost reduction. Additionally, considering automatic welding at the construction site, the bevel is designed as a plain end. The maximum allowable pressure is set at 2.0 MPa, and due to the thin wall thickness, even small diameter fittings feature a wide inner diameter, ensuring sufficient flow capacity. Benkan Kiko holds JIS B 2309 Su joints in stock, allowing for relatively short delivery times. <Stock Range> Types: 90EL, 45EL, 90ES, R(C), R(E), T(S), T(R), LJSE Sizes: 30Su to 300Su

• others

Pipe fittings made of alloy steel contain elements such as Cr (chromium) and Mo (molybdenum) and are mainly used for boiler applications, biomass power generation, main piping and reheating piping for thermal power generation, as well as high-temperature and high-pressure piping for petroleum refining and the chemical industry. Benkan Kiko has a proven track record in the manufacturing of various alloy steel fittings. Additionally, for some materials, we have stock of the steel pipes required, allowing us to deliver relatively quickly. Achieving a carbon-neutral society necessitates reducing CO2 emissions through increased efficiency in plants. Low-alloy steel and high-chromium steel pipe fittings that can withstand harsh high-temperature process environments have become essential products under such conditions. Benkan Kiko is also contributing to society by trying to manufacture special specifications and new materials. <Representative Steel Grades> (JIS Standards) PA12, PA22, PA23, PA24, PA25, PA26 (Thermal Power Standard Materials) Fire STPA28, Fire STPA24J1, Fire STPA29 (ASME/ASTM) A234WP1, WP12, WP11, WP22, WP5, WP9, WP91, WP92

• Prefab
• others
• stone

"High-strength steel" is a type of steel material that has higher tensile strength and strength compared to general materials. Due to its characteristics, it allows for thinner wall thickness in piping design, enabling smaller diameters and lighter weights of pipes. This makes it a widely used joint material in various fields, including oil and gas pipelines. For some materials, we have the steel pipes in stock, allowing us to deliver relatively quickly, which has been well received by our customers. <Representative steel grades> API5L-X42(L290), X52(L360), X60(L415), X65(L450), corresponding to PSL1 and PSL2 classes. A860 WPHY42, A860 WPHY52, A860 WPHY60, A860 WPHY65, MSS SP-75 WPHY42, MSS-SP75 WPHY52, MSS-SP75 WPHY60, MSS SP-75 WPHY65.

• Steel
• Railway Construction
• others

The main product of Benkan Kiko is the [butt-welded pipe fitting], which comes in a wide variety of types depending on the piping application, including material, diameter, wall thickness, shape, and surface treatment. Typically, the manufacturing method for [butt-welded pipe fittings] involves plastic processing. Plastic processing refers to shaping materials (steel pipes and steel plates) by applying a large force to deform them into the desired shape. Benkan Kiko's strength lies in this plastic processing technology. However, in piping primarily related to plants, there are special specifications such as steel types and shapes that cannot be accommodated by plastic processing due to specific needs. In such cases, we consider the [forged steel welded pipe fitting]. The forged products we introduce here are mainly used in plant-related applications. The manufacturing method involves forging, heat treatment, and then complete machining. Forged steel refers to materials that have been subjected to a specified forging ratio applied to steel blocks (ingots) of various steel types. The [forged steel welded pipe fitting] is a product that has been precisely machined into shape. At Benkan Kiko, we can propose a wide range of [forged steel welded pipe fittings] that accommodate various special specifications and steel types.

• Prefab
• others

The term "Monaka method" is named as such because it involves layering two components together like a traditional Japanese sweet called "monaka." You can watch a video of the Monaka method. Please click the link below the "Contact Us" button that says "Video homepage to understand the Monaka method (made of carbon steel)."

• Metalwork
• Special Construction Method
• others

■Content■ This is a method of bending thick-walled steel pipes that cannot be manufactured using the mandrel method. It involves clamping with a mold and repeatedly shaping and correcting the material. You can view the hot die bending (CD) process in a video using actual images. [Process] Mold → Material set → Press start → Shaping press → Material extraction → Finishing press → Press end → Surface treatment → Product Please visit the "Benkan Kiko Official Website" to see more.

• Metalwork
• Special Construction Method
• others

"Bevel" (kaisaki), also known as "groove," refers to the gap created between two base materials when they are joined together, which is necessary to ensure that the welded joint has the same quality and strength as the base materials. At the same time, a design and machining precision that minimizes the occurrence of welding defects is required. For example, increasing the bevel angle results in a larger amount of welding material, which can lead to increased welding labor and affect the mechanical properties and shape distortion near the weld due to the heat input on the base material. Conversely, if the bevel angle is narrowed, it can lead to decreased workability, poor penetration, and the possibility of defects such as slag inclusions that cannot be detected from the surface, increasing the likelihood of welding defects. Therefore, the shape and processing of the bevel are crucial, and they are designed to achieve optimal shapes and dimensions considering factors such as the properties and pressure of the fluid, material, thickness, diameter, and welding environment.

• Rock drills, demolition machines, and excavators
• stone

A non-standard angle elbow refers to elbows with intermediate angles other than the typical 90° or 45°. In piping design, by manufacturing special intermediate angle elbows such as 85.5° or 37° or 135°, it becomes possible to install and connect piping in spaces that cannot accommodate standard elbows. We can manufacture elbows at the angles requested by our customers and also offer product suggestions to address any challenges you may have. Please feel free to consult with us.

• Railway Construction
• Prefab
• stone

Benkan Kiko has a wealth of delivery experience in welded pipe fittings for all nuclear power plants in Japan. Utilizing our expertise in strict quality control for nuclear applications, management of documentation and quality records, and techniques for long and circumferential welding of items subject to inspection by welding contractors, we manufacture not only items subject to welding contractor inspection but also prefabricated piping where nuclear management is required. We have a significant track record in construction measures necessary for the recent restart of nuclear power plants. In particular, we manufacture and deliver prefabricated piping that combines fittings, flanges, nozzles, and nipples for fire protection piping, which traditionally does not require nuclear management. We also conduct strength calculations for these flanges, nozzles, and nipples based on JSME (Japan Society of Mechanical Engineers) standards. We can manufacture using both stainless steel and carbon steel (galvanized), and we are ready to meet various other requests.

• Railway Construction
• Special Construction Method
• others

At Benkan Kiko, we also sell fitting products that are not listed in the catalog. The image shows a special fitting called a "cross" for welded pipe fittings. For more details... please feel free to contact us!

• others
• Fittings
• Piping Equipment

At Benkan Kiko, we also sell joint products that are not listed in the catalog. The image shows a special-shaped joint called a "Y-piece" for welded pipe joints. Its applications include use in boilers, heating furnaces, boiler tubes, and piping for heat recovery.

• Prefab
• others
• Fittings