Commonly referred as blanking flanges, Blind pipe flanges are widely used in high pressure applications. Blind flanges are generally used to seal the end of a piping system to prevent flow of liquids or gases. The use of blind flanges allows ease of access to a piping system once it has been closed. Our blind flanges are available with raised or RTJ faces and also with female threads. Blind flanges can be supplied with or without hub as per the customer requirements. We offer blind plate flanges manufactured at our facility to companies in various industries including shipbuilding, power generation, petrochemical plants, oil refineries, waste water treatment plants, paper mills, pharmaceutical plants and turnkey projects among others.
| Material Category | Available Grades |
|---|---|
| Stainless Steel Blind Flanges | ASTM A182 / A240 F304, F304L, F304H, F316, F316L, F316Ti, F310, F310S, F321, F321H, F317, F347, F347H, F904L. |
| Duplex & Super Duplex Steel Blind Flanges | ASTM/ASME A/SA 182 F44, F45, F51, F53, F55, F60, F61. |
| Carbon Steel Blind Flanges | ASTM/ASME A/SA 105, ASTM/ASME A350, ASTM A181 LF2, ASTM A516 Gr.70, ASTM A36, ASTM A694 F42, F46, F52, F60, F65, F70. |
| Low Temperature Carbon Steel Blind Flanges | ASTM A350 LF2, LF3. |
| Alloy Steel Blind Flanges | ASTM/ASME A/SA 182 & A387 F1, F5, F9, F11, F12, F22, F91. |
| Copper Alloy Blind Flanges | ASTM SB61, SB62, SB151, SB152, UNS C70600 (Cu-Ni 90/10), C71500 (Cu-Ni 70/30), C10100, C10200, C10300, C10800, C12000, C12200. |
| Nickel Alloy Blind Flanges | ASTM SB564, SB160, SB472, SB162, Nickel 200 (UNS N02200), Nickel 201 (UNS N02201), Monel 400 (UNS N04400), Monel K500 (UNS N05500), Inconel 800 (UNS N08800), Inconel 825 (UNS N08825), Inconel 600 (UNS N06600), Inconel 625 (UNS N06625), Inconel 601 (UNS N06601), Hastelloy C276 (UNS N10276), Alloy 20 (UNS N08020). |
Our Blind Flanges are used for line blanking and end-closure applications in pressure systems. We maintain focus on standards compliance, dimensional accuracy, and material traceability to support project and replacement requirements.
Industries Served: oil & gas, petrochemical, refineries, power generation, EPC projects, marine, water treatment, and general engineering.
Supply Regions: India, GCC/Gulf markets, and global export projects with commercial support for manufacturer, supplier, stockist, and exporter requirements.
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Certified stainless steel billets are selected according to ASTM, ASME, and EN standards.
Billets are heated and forged into the required flange shape for maximum strength.
Precision machining creates the bore, facing, bolt holes, and required dimensions.
Stress relieving and solution annealing are performed whenever required.
PMI, dimensional inspection, hydrostatic testing, and NDT ensure product quality.
Flanges are cleaned, pickled, passivated, and finished as per customer requirements.
Each flange receives grade, size, heat number, and standard identification markings.
Products are packed securely with flange protectors, wooden pallets, and export-ready crates.
Under what circumstances is a Blind Flange subjected to the highest stress?
Unlike open flanges such as Slip-On or Weld Neck Flanges, a Blind Flange functions as a flat plate bolted across a pressurized pipe opening. It experiences substantial bending stresses near the center because the full force of the internal system pressure acts directly against its flat face, making it one of the most highly stressed flange types in a piping system.
What is the main function of a Blind Flange (BLRF)?
A Blind Flange is manufactured without a center bore and is used to safely seal the ends of piping systems, valves, or pressure vessel openings. It is commonly used for maintenance isolation, system testing, and future pipeline expansion while withstanding significant bending stresses.
Can Blind Flanges handle high-pressure applications?
Yes. Blind Flanges are highly robust and designed to withstand high internal pressure. We manufacture them up to ASME B16.5 Class 2500 and regularly supply them for demanding oil and gas, refinery, and petrochemical shutdown projects.