High-pressure Sealing Solution For Pipelines
Blind flanges offer reliable end sealing for industrial piping, ensuring pressure containment and corrosion resistance in oil, gas, and chemical systems.
High-pressure Sealing Solution For Pipelines
Blind flanges offer reliable end sealing for industrial piping, ensuring pressure containment and corrosion resistance in oil, gas, and chemical systems.
Blind Flange is a solid disc used to seal the end of a piping system, preventing flow and providing pressure containment. Conforming to ASME B16.5, ASME B16.47, and DIN standards, it is crafted from materials like carbon steel, stainless steel, and alloys for durability in harsh conditions.
The Sealing Flange Solution features a flat or raised face with bolt holes for secure attachment, available in sizes from 1/2” to 60” and pressure ratings up to 2500 PSI. Its design allows for easy inspection or future expansion by removing the flange, making it ideal for temporary or permanent closures.
Blind Flange undergoes hydrostatic and ultrasonic testing to ensure leak-proof performance. Coated with galvanizing or FBE for corrosion resistance, it withstands temperatures from -20°C to 600°C, depending on the material, and is suitable for high-pressure applications in oilfields and refineries.
Compared to pipe caps, Blind Flange offers greater accessibility and reusability, enabling system modifications without cutting pipes. Proper bolt torque and gasket selection are key to maintaining its seal integrity. With a service life of 20–40 years, it is a cost-effective closure option.
Blind Flange addresses challenges like pressure leaks and corrosion in industrial piping, providing a reliable, durable, and adaptable solution for sealing oil, gas, and chemical pipelines.
DIN16 Blind Flange
Blind flanges are providing a means to seal off the end of a pipe or vessel.
These flanges are typically solid discs bolted onto the pipe’s end, typically with a defined facing for sealing. Blind Flanges are used for many applications, including:
1. Blind flange 2. Stud Bolt 3. Gasket 4. Other flange
The blind flange is used to close ends of piping systems.
It is a kind of round plate with no center hold but with all the proper bolt holes. This blind flange is available in various sizes and materials and is used to provide positive closer on the ends of pipes, valves or equipment nozzles. This flange helps in easy access to a line once it has been sealed. The blind flange is sometimes custom made or machined to accept a nominal sized pipe to which reduction is being made.
A blind flange is useful for making repairs to a pipeline further up the line. In fact, during construction of a pipeline, a blind flange may be built into the final length of pipe. This allows for expansion or continuation of the pipeline simply by adding onto the final flange.
Features a raised ring around the face for improved sealing, suitable for high-pressure connections.
Uses a metal ring gasket for sealing, excellent for extreme pressure and temperature conditions.
Designed with a flat face, mainly used in low-pressure applications where sealing demands are moderate.
Attached by a circular weld around the neck, providing excellent strength and durability under harsh conditions.
Similar to weld neck design but with a shorter neck, ideal for installations in tight spaces.
Forged blind flanges have better mechanical properties, higher strength, and superior resistance to shear and tensile forces.
Casting blind flanges are more economical to produce, with accurate shapes but inferior mechanical performance.
Forged Blind flange Appication
Without a blind flange, it would be next to impossible to repair or perform ongoing maintenance to a pipeline unless the flow was shut off at a earlier valve, which could affect miles of pipeline.
The use of flanged pipe has significantly sped up the process for constructing pipelines. It has also made the task of repair and sectional replacement easier.
A blind flange may be used for isolating a pipe, valve, or pressure vessel. Our flanges are extensively used in the oil, gas and petroleum industries.
Blind flanges can be supplied with NPT fittings, allowing pressure test connections.
They are commonly used to blank off the ends of pipes, providing complete closure.
Also used to blank off the ends of valves and pressure vessel openings.
Blind flanges are the most highly stressed type, especially in larger sizes, due to internal pressure and bolt loading.
They can safely withstand higher bending stresses at the center compared to other flanges.
Blind flanges are manufactured to fit standard pipe sizes, ensuring wide compatibility.
Explore Blind Flange with targeted long-tail keywords for specifications, applications, and sealing solutions.
Note: Blind Flange meets ASME and DIN standards, ensuring reliable sealing. Contact suppliers for detailed specs.
The most common type, featuring a raised sealing surface that concentrates the bolting force on a smaller area.
Has a flat sealing surface, commonly used with cast iron flanges and for low-pressure applications.
Features a groove for metal ring gaskets (oval or octagonal), providing metal-to-metal sealing.
Features matching tongue and groove surfaces, providing self-alignment and confined gasket area.
Flange faces have to be smooth enough to ensure a tight, leak-free seal for bolted flanges.
| Flange Face Type | Flange Face Type | Flange Face Type |
|---|---|---|
| Type A: flat face | Type D: groove face | Type G: O Ring recess |
| Type B: raised face | Type E: spigot | Type H: O Ring groove |
| Type C: tongue face | Type F: recess |
| ASME B16.5 | Pipe Flanges NPS 1/2 - 24 |
| ASTM A105 | Forged Carbon Steel |
| ASTM A350 LF2 | Low-Temperature Service |
| ASTM A182 | High-Temperature Service |
| ASTM A694 | High-Pressure Transmission |
| DIN EN 1092-1 | European Standard PN 2.5-400 |
Most commonly used, forged with machined surfaces
Corrosion resistant, grades 304, 316, etc.
High-temperature and high-pressure applications
Cast iron, aluminum, brass, bronze, plastic
| Material Category | Fittings (ASTM Grade) | Flanges (ASTM Grade) | Valves (ASTM Grade) | Bolts & Nuts (ASTM Grade) |
|---|---|---|---|---|
| Carbon Steel | A234 Gr WPA | A105 | A216 Gr WCB | A193 Gr B7 A194 Gr 2H |
| A234 Gr WPB | A105 | A216 Gr WCB | ||
| A234 Gr WPC | A105 | A216 Gr WCB | ||
| Carbon Steel
Alloy (High-Temperature) |
A234 Gr WP1 | A182 Gr F1 | A217 Gr WC1 | A193 Gr B7 A194 Gr 2H |
| A234 Gr WP11 | A182 Gr F11 | A217 Gr WC6 | ||
| A234 Gr WP12 | A182 Gr F12 | A217 Gr WC6 | ||
| A234 Gr WP22 | A182 Gr F22 | A217 Gr WC9 | ||
| A234 Gr WP5 | A182 Gr F5 | A217 Gr C5 | ||
| A234 Gr WP9 | A182 Gr F9 | A217 Gr C12 | ||
| Carbon Steel
Alloy (Low-Temperature) |
A420 Gr WPL6 | A350 Gr LF2 | A352 Gr LCB | A320 Gr L7 A194 Gr 7 |
| A420 Gr WPL3 | A350 Gr LF3 | A352 Gr LC3 | ||
| Austenitic Stainless Steel | A403 Gr WP304 | A182 Gr F304 | A182 Gr F304 | A193 Gr B8 A194 Gr 8 |
| A403 Gr WP316 | A182 Gr F316 | A182 Gr F316 | ||
| A403 Gr WP321 | A182 Gr F321 | A182 Gr F321 | ||
| A403 Gr WP347 | A182 Gr F347 | A182 Gr F347 |
ASTM standards define the specific manufacturing process of the material and determine the exact chemical composition of pipes, fittings and flanges, through percentages of the permitted quantities of carbon, magnesium, nickel, etc., and are indicated by "Grade".
The usual materials of flanges include stainless steel, carbon steel, aluminum and plastic. The choice of the material largely depends on the purpose of the flange. For example, stainless steel is more durable and is necessary for heavy use. On the other hand, plastic is more feasible for use in the home because of its reasonable price and easy installation. The materials used for flanges are under the designation of the American Society of Mechanical Engineers.
The most common materials for pipe flanges (forged grades) are: ASTM A105 (carbon steel high temperature to match A53/A106/API 5L pipes), A350 Grades LF1/2/3 (carbon steel low temperature to match A333 pipes), A694 Grades F42 to F80 (high yield carbon steel to match API 5L pipe grades), ASTM A182 Grades F5 to F91 (alloy steel flanges to match A335 pipes), A182 Grade F304/316 (stainless steel flanges to match A312 SS pipes), A182 Gr. F44/F51/F53/F55 (duplex and super duplex to match A790/A928 pipes) and various nickel alloy grades (Inconel, Incoloy, Hastelloy, Monel).
The material qualities for these flanges are defined in the ASTM standards.
Metal flanges are classified from 150 to 2500 # rating for different pressure applications.
Incoloy 825 Flange
Industries Using
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