Blind Flange Manufacturer & Supplier in India

Hi-Tech Engineering is a Blind Flange Manufacturer & Supplier in India, offering forged blind flanges for industrial piping systems, pressure vessels, storage tanks, and process equipment. We supply carbon steel, stainless steel, and alloy steel blind flanges in accordance with ASME, ANSI, DIN, EN, and JIS standards for applications requiring secure sealing and system isolation.

Blind flanges are widely used in oil & gas facilities, power plants, petrochemical units, refineries, chemical processing plants, and heavy engineering industries where a piping system needs to be closed temporarily or permanently. Their solid construction provides reliable leak-proof sealing and allows easy access for inspection, maintenance, pressure testing, and future pipeline expansion.

Available in sizes from ½" to 60" NB and pressure ratings from Class 150 to Class 2500, our blind flanges can be supplied in standard as well as custom dimensions according to project specifications and customer drawings.

What is a Blind Flange?

A Blind Flange is a solid flange without a bore, designed to seal the end of a piping system, valve connection, vessel opening, or equipment nozzle. Unlike weld neck, slip-on, or threaded flanges, blind flanges do not allow fluid flow through the connection and are primarily used to isolate sections of a piping system.

Blind Flanges are also commonly known as ASME B16.5 Blind Flanges, RF Blind Flanges, RTJ Blind Flanges, and Class 150 to Class 2500 Blind Flanges depending on their design and pressure rating.

Blind flanges are commonly installed when future modifications, maintenance access, system expansion, or pressure testing may be required. Because they are subjected to internal pressure without a central opening, blind flanges are generally manufactured with greater thickness and strength compared to other flange types.

Their ability to provide complete system closure makes them one of the most important components in industrial piping installations.

Types of Blind Flanges

Raised Face Blind Flange (RF)

Raised Face Blind Flanges are the most commonly used type in industrial piping systems. The raised sealing surface provides improved gasket compression, resulting in dependable sealing performance under various operating conditions.

Ring Type Joint Blind Flange (RTJ)

RTJ Blind Flanges are designed for severe service conditions involving high pressure and elevated temperatures. They utilize metallic ring gaskets to achieve superior sealing performance in critical applications such as refineries, offshore installations, and petrochemical plants.

Flat Face Blind Flange (FF)

Flat Face Blind Flanges feature a flat sealing surface and are commonly used in low-pressure systems or installations connected to cast iron equipment requiring full-face gasket contact.

Technical Specifications

Available Material Grades

ASME B16.5 Blind Flanges

ASME B16.5 Blind Flanges are supplied in a wide range of sizes, pressure ratings, and material grades for industrial piping systems. These flanges are manufactured according to ASME dimensional standards to ensure accurate fitment, reliable sealing performance, and compatibility with standard piping components.

Class 150 to Class 2500 Blind Flanges

We supply Blind Flanges in Class 150, 300, 400, 600, 900, 1500, and 2500 pressure ratings for pipeline isolation, pressure vessel openings, maintenance shutdown points, and hydrostatic testing applications. The selection of the pressure class depends on operating pressure, temperature, and service conditions of the piping system.

Carbon Steel Blind Flanges

Carbon Steel Blind Flanges are widely used in industrial piping systems due to their excellent strength, durability, and cost-effectiveness. We supply ASTM A105, ASTM A350 LF2, and ASTM A694 grade blind flanges for oil & gas, power generation, refinery, and heavy engineering applications.

Stainless Steel Blind Flanges

Stainless Steel Blind Flanges are suitable for corrosive service environments where resistance to chemicals, moisture, and aggressive media is required. Available grades include ASTM A182 F304, F304L, F316, and F316L.

Alloy Steel Blind Flanges

Alloy Steel Blind Flanges are supplied in ASTM A182 F11, F22, and F91 grades for high-temperature and high-pressure applications commonly found in thermal power plants, petrochemical facilities, and process industries.

Applications & Industries Served

Blind Flanges are widely used in industrial piping systems where complete isolation, secure sealing, pressure testing, and future maintenance access are required.

Dimensions & Weight Chart

Blind Flange dimensions and weights vary according to pressure class, material grade, facing type, and applicable flange standard. Hi-Tech Engineering supplies Blind Flanges in accordance with ASME B16.5, ASME B16.47 Series A & B, DIN, EN 1092-1, and JIS standards. Standard sizes are available from 1/2" NB to 60" NB with pressure ratings ranging from Class 150 to Class 2500.

A Blind Flange is a solid flange without a bore, designed to seal the end of a piping system, pressure vessel opening, or equipment connection. Key dimensional requirements include outside diameter (OD), flange thickness, bolt circle diameter (BCD), number of bolt holes, facing dimensions, and overall flange weight. These dimensions are critical for achieving proper gasket compression, secure sealing, and safe operation under pressure.

We supply Carbon Steel, Stainless Steel, and Alloy Steel Blind Flanges for pipeline isolation, pressure testing, maintenance shutdowns, storage tanks, pressure vessels, refineries, petrochemical plants, power generation facilities, and other industrial applications. Custom dimensions and machining can also be provided according to customer drawings and project specifications.

Inspection, Testing & Certification

Every blind flange is supplied with strict quality control measures to ensure dimensional accuracy, material compliance, and project-specific requirements.

Apart from forged flanges, we also manufacture forged rings, forged shafts, and forging hammers for industrial applications.

For more information or to discuss your requirements, Contact us now for the best price and fast delivery. Call +91 9555009232 or email info@hitech-engineering.in.

Frequently Asked Questions (FAQ)