Integral Flange IF
IF integral flanges are formed by one-piece forging of the body itself, with no spliced weld seams. They are mainly used for the ports of valves, centrifugal pumps, pressure vessels, heat exchange equipment, and high-pressure units, serving as the equipment's own connection end to achieve sealed docking of piping systems. They are used for pipeline connections involving high pressure, high temperature, flammable and explosive, and toxic media, and bear the core pressure-bearing sealing role between equipment and pipelines. They can achieve permanent and stable connections, eliminating problems such as weld seam cracking, leakage, and stress deformation, and are suitable for main process pipelines of plants, high-pressure equipment connections, and high-risk chemical pipeline systems. Unlike ordinary welded flanges, they do not require on-site welding installation, have extremely strong overall rigidity, and have no risk of loosening during long-term operation. They are essential core connection fittings for special equipment, pressure equipment, and high-end chemical plants.
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- The biggest advantage of IF integral flanges is one-piece forging, zero welds, and ultra-high rigidity
- Integrated structure with the equipment body
- Completely eliminates the hidden risks of weld cracking, air leakage, oil seepage, and deformation in welded flanges. Uniform stress distribution
- Resistance to high pressure, high temperature, fatigue, and vibration far exceeds ordinary butt-welding and slip-on flanges. High-precision finish machining of the sealing surface
- Superior pressure-tight sealing
Detailed Introduction
Integral Flange (IF) is a key component in industrial pipeline connections. Its uniqueness lies in the fact that the flange and the equipment body (such as valves, pumps, pressure vessels, etc.) are manufactured as a single integrated unit through integral forging or casting processes, forming an inseparable whole. Therefore, it has no weld seams like traditional welded flanges, features high structural rigidity, and uniform stress distribution, capable of withstanding high pressure, high temperature, vibration, and alternating loads, making it particularly suitable for harsh media such as flammable and explosive, toxic and hazardous substances. This product complies with domestic and international standards such as HG/T20596, GB/T9113, ASME B16.5, EN1092-1, with a nominal diameter range of DN15-DN600, pressure ratings of Class150-2500LB or PN16-PN160, and various sealing face forms. We offer multiple materials including carbon steel and stainless steel, and support non-standard customization to meet the special requirements of different projects.
- Integrally forged and formed, no weld seams, high structural strength, eliminating hidden dangers of weld seam cracking and leakage
- Uniform stress distribution, resistant to high pressure, high temperature, vibration, and fatigue, suitable for harsh working conditions
- Precision-turned sealing face, reliable sealing performance, suitable for flammable, explosive, and toxic media
- No on-site welding required, easy installation, high stability, long service life
- Complies with standards such as HG/T20596, GB/T9113, ASME B16.5, EN1092-1, precise dimensions, strong interchangeability
- Supports multiple materials, high pressure, non-standard customization, meeting the supporting needs of special equipment
| Product Name | Integral Flange IF |
| Product Category | Contact Us to Confirm |
| Standard | HG/T20596, GB/T9113, ASME B16.5, EN1092-1; Nominal diameter: DN15-DN600; Pressure rating: Class150-2500LB, PN16-PN160; Sealing face forms: RF, FF, MFM, TG, RJ; Processes: integral forging, heat treatment, precision turning, non-destructive testing; Structural features: one-piece seamless weld, high-rigidity pressure-bearing structure; Connection method: bolt and gasket fastening for sealing; Working temperature: carbon steel -20℃~425℃, stainless steel -196℃~600℃; Applicable media: steam, oil and gas, high-temperature and high-pressure fluids, flammable and explosive, corrosive chemical media. All parameters strictly benchmark against international standards, |
| Customization | Our factory possesses full-dimensional IF integral flange high-end non-standard customization capabilities, and can customize extra-large diameter, ultra-high pressure thickened, non-standard irregular dimensions, and special neck length integral flanges. Supports customization of high-precision RJ high-pressure ring grooves, special sealing surface polishing, irregular bolt hole spacing, and eccentric structure flanges. Can perform sandblasting, blackening, hot-dip galvanizing, high-temperature resistant anti-corrosion, and acid-alkali resistant special coating treatments. Can reverse-customize integrated flanges according to customer equipment drawings, pump and valve interface parameters, and pressure vessel matching dimensions. Supports laser marking, LOGO engraving, batch code customization, and exclusive OEM packaging. Can produce low-temperature steel, duplex steel, nickel-based alloy and other high-precision material products, adapting to the customization and matching needs of domestic and international high-end special equipment and high-pressure devices. |
| MOQ | Our factory's IF integral flanges adopt a flexible and relaxed foreign trade minimum order model. The MOQ for conventional standard in-stock specifications is as low as 1 piece, which can meet the needs of equipment repair and replacement, project trial samples, small-batch replenishment, and urgent engineering restocking. Commonly used carbon steel and stainless steel conventional diameter, medium and low pressure grade specifications on the market support scattered purchasing, mixed batches of multiple specifications, and combined order shipment, with no mandatory minimum order threshold. Large-batch full |
| Lead Time | Conventional national standard and American standard IF integral flanges are kept in regular stock. Conventional specifications are shipped quickly within 24 hours, solving equipment emergency repair and project replenishment needs. The production lead time for standard batch conventional orders is 3-7 working days, with stable production capacity and on-time shipment. The lead time for ordinary non-standard orders such as modified bolt holes, modified sealing surfaces, and slightly adjusted dimensions is 7-10 working days. Extra-large diameter, ultra-high pressure 2500L |
| Packaging | Our factory's IF integral flanges adopt special high-end protective packaging for foreign trade export, strictly protecting high-precision sealing surfaces and forged bodies. The flange sealing surfaces are affixed with thickened anti-scratch and anti-rust protective film to eliminate transportation collisions and scratches, oxidation and rust, and precision damage. Products are individually wrapped and isolated with thickened bubble film to avoid friction and impact; conventional specifications are classified and packed into high-strength export cartons, and large-batch orders are packed with fumigated solid wood pallets, reinforced with steel straps, stable and secure against loosening, suitable for long-distance ocean shipping. The outer packaging is clearly printed with model, standard, material, pressure, specification, batch, and export shipping marks. Supports neutral packaging, customer LOGO OEM, exclusive shipping marks, and customized packaging boxes, fully complying with export commodity inspection, customs clearance, and overseas high-end warehousing standard requirements. |
| Reference Price | Inquiry |
Applications
- High-pressure pipeline connections in petrochemical plants, such as reactor and heat exchanger ports
- Steam systems in thermal power plants, boiler feedwater pipeline connections
- Coal chemical high-pressure reaction systems, gasification plant pipeline connections
- Natural gas processing plants, equipment connections in long-distance transmission pipelines
- Pressure vessels, pumps, valves, and other equipment are factory-supplied with flanged ports for connection to piping systems
Overview
Integral flange IF, also known as long-neck flange, is an indispensable connecting component in high-pressure equipment in the chemical, power, coal chemical, and other industries. It is manufactured by integral forging with the equipment body, with no weld seams, so it has high structural strength and can withstand extremely high pressure. Our integral flanges comply with standards such as HG/T20596, GB/T9113, ASME B16.5, and EN1092-1, with nominal diameters from DN15 to DN600 and pressure ratings covering Class150 to 2500LB, meeting the needs of different operating conditions.
Key Features
Integrally forged, no weld seams, eliminating the common cracking and leakage problems of welded flanges; uniform stress distribution, excellent resistance to high pressure, high temperature, and vibration; precision-turned sealing surface ensures reliable sealing; no on-site welding required, convenient installation, and shortened construction period; precise product dimensions, strong interchangeability, and easy maintenance and replacement.
Applications
Integral flange IF is mainly used in pressure vessels, valves, pumps, and other equipment in industries such as petrochemical, thermal power generation, coal chemical, and natural gas processing, as a standard port for connecting equipment to piping. It is suitable for high-pressure, high-temperature, flammable and explosive, toxic and hazardous media, and is a key component for ensuring the safe operation of the plant.
Specifications
We provide integral flanges from DN15-DN600, with pressure ratings of Class150-2500LB or PN16-PN160, and sealing surface forms including RF, FF, MFM, TG, RJ, etc. Materials include carbon steel, stainless steel, etc., and the specific choice can be made according to operating conditions. All products are strictly produced in accordance with standards and have undergone non-destructive testing.
Purchase & Delivery
We provide flexible foreign trade minimum order models, with MOQ for standard specifications as low as 1 piece, and support mixed batch consolidated orders. Regular specifications are in stock and can be shipped within 24 hours; batch orders have a delivery time of 3-7 working days; non-standard customized orders have a delivery time of 7-10 working days. Packaging uses export standards to ensure transportation safety.
Service & Support
We provide comprehensive after-sales service, including quality assurance, free replacement, technical consultation, etc. All products undergo strict quality inspection before leaving the factory to ensure they are defect-free. We support long-term matching, inventory custody, and provide selection guidance. If you have any questions, please feel free to contact us at any time.
FAQ
What is the difference between integral flange IF and welded neck flange WN?
Integral flange IF is part of the equipment body itself, forged integrally with the valve body, pump body, etc., with no weld seams and high structural strength, suitable for high-pressure and high-risk working conditions; while the welding neck flange WN is an independent pipeline flange that needs to be welded to the pipeline, suitable for ordinary pipelines.
Does the integral flange IF require on-site welding?
Not required. The integral flange IF is integrally formed with the equipment body. During installation, it only needs to be connected to the external pipeline flange through bolts and gaskets, without on-site welding, making installation convenient and safe.
Can integral flange IF be used in high-temperature and high-pressure working conditions?
Yes. The integral flange IF is formed by integral forging, with no welds, and offers excellent resistance to high temperature and high pressure. We provide carbon steel and stainless steel materials. Carbon steel is suitable for temperatures from -20°C to 425°C, while stainless steel can reach -196°C to 600°C. The specific choice can be made according to the operating conditions.
Can you provide non-standard customized integral flanges?
Yes. We support non-standard customization, including extra-large diameters, special materials, special sealing surfaces, etc., and can customize according to your drawings or requirements. Please contact us to confirm the specific requirements.
Q1: What is the difference between an IF integral flange and a WN welding neck flange? Answer: IF is integrally forged with the equipment and has no weld seam
Please contact us and provide specific specifications, purchase quantity, and delivery requirements, and we will assist in confirming a suitable solution.
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