Plate-formed flanged short piece, also known as rolled flanged short piece or large-diameter steel plate lap joint short piece, is a non-standard custom pipe fitting developed by us for ultra-large-diameter pipelines above DN600. The maximum forming diameter of conventional seamless stamped flanged short pieces is generally up to DN600, and diameters exceeding this cannot be integrally stamped; therefore, large-diameter projects generally adopt the method of steel plate rolling, butt welding, and integral precision machining for production. The product is divided into two structures: long type LP and short type SP, used in conjunction with loose flanges; one end is connected to the main pipe with a butt-welding bevel, and the other end has a flanged sealing face that matches the slip-on flange, achieving 360° rotational alignment and reducing on-site installation difficulty. Materials can be adapted to carbon steel, stainless steel, duplex steel, alloy steel, and other series, and support customization of diameter, length, flange thickness, and pressure rating according to drawings.
Product Overview
Plate-formed flanged stubs are non-standard custom pipe fittings we developed for ultra-large-diameter pipelines above DN600. Since conventional seamless stamped flanged stubs generally have a maximum forming diameter of only DN600, and diameters exceeding this cannot be integrally stamp-formed, large-diameter projects commonly adopt the production method of steel plate rolling, butt welding, and integral precision machining. Products are divided into two structures: long type LP and short type SP, used in conjunction with loose flanges, with one end connected to the main pipe by a butt-weld bevel, and the other end's flanged sealing face matched with a slip-on flange, achieving a detachable, rotatable, and maintenance-friendly flexible connection. Suitable for engineering scenarios such as municipal water supply and drainage, large storage tanks, chemical industrial parks, and power generation smoke exhaust.
Key Features
First, strong diameter coverage capability, customizable DN600–DN3000 ultra-large diameters, filling the market gap for large-diameter connecting pipe fittings. Second, strict process control, adopting multiple processes such as CNC rolling, bevel precision machining, flanging face turning, roundness correction, and non-destructive testing, controlling ovality and end-face flatness. Third, flexible structural choices, long type LP isolates the welding heat zone, short type SP saves cost, selectable according to working conditions. Fourth, wide material adaptability, supporting carbon steel, stainless steel, duplex steel, alloy steel, etc., and can also adopt a combined solution of corrosion-resistant plate-formed pipe fittings paired with carbon steel flanges. Fifth, the flanged end face matched with a slip-on flange can achieve 360° rotational alignment, reducing the on-site installation difficulty of large-diameter pipelines.
Applications
Plate-formed flanged stubs are mainly used for ultra-large-diameter, large-flow large pipeline systems that require frequent maintenance and modification. In municipal infrastructure, used for urban main water supply and drainage pipe networks, large pipe network laying in new districts, ultra-large pipeline renovation in old urban areas, and park centralized transmission main pipelines. In environmental protection and water treatment, suitable for large sewage plant main pipes, large-flow water reuse pipelines, exhaust gas treatment ventilation main pipes, and seawater desalination plant inlet main pipelines. In the chemical industry, used for ultra-large process transmission pipelines in chemical industrial parks, inlet and outlet connections of large storage tanks, and large-diameter pipelines of circulation systems. In power and energy, used for power station ventilation and smoke exhaust pipelines, large-diameter pipelines of cooling systems, and public transmission pipe networks in energy plant areas. Also suitable for large factory-area equipment-dense pipelines, outdoor open-air large-diameter pipe networks, and large industrial pipeline systems that require regular disassembly for cleaning or maintenance and replacement.
Specifications
Plate-formed flanged stubs are non-standard custom products, with conventional diameter coverage of DN600–DN3000, and structures divided into long type LP and short type SP. Compatible materials include series such as carbon steel, stainless steel, duplex steel, and alloy steel; specific material grades, wall thickness, flange thickness, pressure rating, and sealing face precision can be confirmed according to project drawings. The connection method is one end connected to the main pipe by a butt-weld bevel, and the other end's flanged sealing face matched with a loose flange for slip-on connection. Supports customization according to customer drawings for diameter, straight pipe length, flange thickness, pressure rating, and outer packaging markings. If you need to confirm specific specification parameters, please contact us and provide diameter, quantity, material, and working condition requirements, and we will assist in confirming the configuration.
Procurement & Delivery
Plate-formed flanged stubs are large-diameter non-standard custom products, and we set tiered minimum order quantities. For conventional DN600–DN1200 mainstream large diameters, conventional wall thickness, and common specifications of carbon steel and 304/316 stainless steel, the MOQ is as low as 1 piece. For conventional carbon steel and 304/316 stainless steel DN600–DN1200 standard specifications, the production lead time is 5–7 working days; for other specifications and materials, please contact us to confirm the lead time. Packaging adopts a large-scale foreign trade protection scheme: thickened anti-scratch protective film is applied to the sealing face, anti-collision protective rings are added to the bevels, the pipe fitting body is wrapped with waterproof winding film and shock-absorbing pearl cotton, single pieces are reinforced and then strapped with steel bands, and large batches are loaded on reinforced and thickened export solid wood pallets, conforming to sea freight loading standards for oversized cargo. Supports customization of customer-exclusive English shipping marks, project numbers, batch markings, and specification labels.
Service & Support
We provide pre-sales, in-sales, and after-sales support for engineering customers and foreign trade merchants purchasing plate-formed flanged stubs. The pre-sales technical team can assist with large-diameter working condition selection, pressure rating matching, material adaptation, flange matching, and on-site installation plan guidance. Products undergo multiple quality inspections before leaving the factory, including rolling and shaping re-inspection, dimensional precision verification, end-face flatness testing, weld non-destructive testing, and pressure-bearing adaptation testing. After-sales provides technical support for large pipeline welding processes, hoisting and installation, and pipeline operation and maintenance, with full-process oversized logistics tracking for orders, assisting overseas customers with customs clearance and receiving goods. The product warranty period is 18 months; during the warranty period, quality problems caused by non-human damage are repaired or replaced free of charge, with 7×24-hour foreign trade engineering after-sales response.
FAQ
What is the difference between plate-formed flanged stubs and ordinary stamped flanged stubs?
Ordinary stamped flanged short ends are generally limited to small and medium diameters of DN15–DN600; beyond DN600, they cannot be integrally stamped and formed. Plate-made flanged short ends use steel plate rolling and welding, integral shaping, and end-face finish turning processes, and are specifically used for extra-large diameter pipelines above DN600. They are a commonly used process solution for large-diameter lap joints and are suitable for projects such as municipal engineering, storage tanks, and large pipeline networks.
Will large-diameter plate-made flanged short ends easily deform?
Before leaving the factory, the product undergoes multiple roundness corrections, stress relief, and finish machining and shaping. The ovality is controlled within the allowable range of the standard, and the sealing surface is flat and stable. During packaging, thickened anti-scratch protective film is applied to the sealing surface, and anti-collision protective rings are installed on the beveled ends. During transportation, steel strip bundling and solid wood pallets are used for fixation to reduce the risk of deformation.
Can plate-made flanged short ends be used for large outdoor pipeline networks?
Yes. The plate material is stable and the structure is firm, making it suitable for large-diameter outdoor open-air pipeline networks. The specific material selection must be confirmed according to the medium, temperature, and corrosion conditions. Please contact us to provide the working conditions information, and we will assist in confirming the appropriate material and anti-corrosion solution.
What are the minimum order quantity and delivery time for plate-made flanged short ends?
For conventional DN600–DN1200 mainstream large diameters, conventional wall thicknesses, and commonly used specifications of carbon steel and 304/316 stainless steel, the MOQ is as low as 1 piece, and the production delivery time is 5–7 working days. For other diameters, materials, and specially customized specifications, please contact us to confirm the minimum order quantity and delivery time.
How can I obtain a quotation for plate-made flanged short ends?
Please provide the required size, quantity, material, pressure rating, structural type (long pattern LP or short pattern SP), and whether there are drawings or technical agreements. We can confirm the configuration and assist with the quotation according to the project requirements. Special sizes, special lengths, and special flange thicknesses can all be customized according to drawings.
