Hastelloy Flanges
Hastelloy flanges are specialized connection components used to securely join pipes, valves, or equipment within corrosive and high-stress environments. These flanges are precisely machined to ensure tight sealing and alignment, even under thermal expansion, vibration, or pressure fluctuations. Their design minimizes crevice areas where corrosion typically initiates, making them especially useful in systems with frequent temperature cycling or aggressive cleaning processes. These flanges are used extensively in process lines where disassembly and maintenance are required, such as in chemical plants, offshore platforms, and high-purity systems. Their ability to maintain mechanical integrity over long service cycles reduces the risk of joint failure and system downtime.
Hastelloy Flanges - Specification Table
| Parameter | Details |
|---|---|
| Manufacturing Standards | ASTM B564 (Alloy Flanges), ASME B16.5 (Pipe Flanges), ASME B16.47 (Large Diameter Flanges) |
| Flange Types | Weld Neck, Slip-On, Blind, Threaded, Socket Weld, Lap Joint |
| Material Grades | C-4, C-22, C-22HS, C-276, C-2000, B, B-2, B-3, G, G-2, X, N, W |
| Size Range | ½" to 24" (larger sizes available on request) |
| Pressure Ratings | Class 150, 300, 400, 600, 900, 1500, 2500 |
| Facing Types | Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ) |
| Surface Finish | Machined, Serrated, Smooth, Pickled & Passivated |
| Dimensional Standards | ANSI/ASME B16.5, B16.47, MSS SP-44 |
| Heat Treatment | Solution Annealed or Stress Relieved |
| Tolerances | As per ASTM B564 and ASME flange standards |
| Typical Applications | Corrosive piping systems, chemical reactors, offshore platforms, power generation plants |
Flange Type
| Flange Type | Description | Applications |
|---|---|---|
| Weld Neck Flange | Features a long tapered neck that is welded directly to the pipe. | High-pressure applications, reactors, heat exchangers, pipelines. |
| Slip-On Flange | Slip over the pipe and then welded both inside and outside. | Ideal for low-pressure systems, valves, tanks. |
| Socket Weld Flange | A flange with a socket for the pipe to be inserted and welded. | High-pressure, small-bore piping systems, hydraulic lines. |
| Blind Flange | Used to seal the end of a pipe or valve. | For closing pipe ends, maintenance ports, and vessel openings. |
| Threaded Flange | Flange with internal threads that screw onto the pipe without welding. | Low-pressure systems, for quick installation without welding. |
| Lap Joint Flange | Designed for easy disassembly, with a stub end that fits into the flange. | Marine systems, easy access for inspection or cleaning. |
| Orifice Flange | Has built-in orifice for measuring fluid flow using orifice meters. | Flow measurement systems in pipelines, especially in gas lines. |
| Ring-Type Joint (RTJ) Flange | Flange with a groove for a metal ring gasket, used in high-pressure systems. | Critical pressure applications, oil & gas, petrochemical plants. |
| Expander Flange | Flange that is used to connect pipes of different diameters. | Systems that require a change in pipe size (e.g., compressor systems). |
| Reducing Flange | Connects pipes of different diameters, reducing the size of the pipe. | Suitable for pressure systems with varied pipe sizes. |
| Long Weld Neck Flange | Similar to Weld Neck but with an extended neck. | High-temperature systems, reactors, and vessels under pressure. |