Reliable High-pressure Piping Support
An Anchor flange is a forged fitting that looks like a weld neck flange with shape.
Reliable High-pressure Piping Support
An Anchor flange is a forged fitting that looks like a weld neck flange with shape. Anchor Flange is a device that is installed on the lines of the piping system to deal with the axial movement and prevent the movement of the pipeline.
Anchor Flanges are robust steel flanges designed to provide structural support and stability in high-pressure piping systems, adhering to ASME B16.5 standards as of August 23, 2025, 06:14 PM PDT. These Piping Stability Flanges ensure secure anchoring.
Available in sizes from 1/2” to 48”, Anchor Flanges support pressure ratings up to Class 2500 and temperature tolerances up to 650°C, depending on material, ideal for demanding environments.
Forged or machined with reinforced designs, these flanges offer exceptional durability, with coatings like FBE or galvanizing enhancing corrosion resistance as of August 2025. They are built for longevity.
Compared to standard flanges, Anchor Flanges provide superior stability for pipelines, offering a service life of 20–40 years with proper maintenance and protective measures.
Anchor Flanges address challenges like pipeline movement and vibration, delivering reliable high-pressure flange support as of August 23, 2025.
Quality Standard for Anchor Flanges
High quality Anchor Flanges all made and controlled to the relevant standards such as: ASME, ASTM, BS and DIN/WERKSTOFFE.
Sizes for Anchor Flanges
Welded into the line and encased in concrete, they immobilize the pipe at predetermined locations and transfer built-up stresses to external structures. For example, in cross-county pipelines end forces of considerable magnitude are generated by internal pressure and temperature changes. A 24″ O.D. x 0.594″ wall pipe in a pipeline operating at 1100 psi and subjected to a 90° rise in metal temperature, for example, will develop total thrust of 1,000,000 lbs.
Unless these forces are properly controlled, they can damage pumps, valves and other close-tolerance equipment. Anchor Flange may be used to secure subsea piping and risers to platform structures.
The Anchor flange is designed for immobilization of high pressure pipe lines.
The Anchor flange is a one-piece combination reducer and welding neck flange designed expressly for effecting pipe size increases at flanged connections to pumps, valves, compressors and other equipment. It provides a more compact, more efficient and frequently a more economical means than is permitted by the conventional two-piece combination of a concentric reducer and welding neck flange.
The following information must be provided while ordering an anchor flange.
Orifice flanges, abbreviated as ORFF, are for metering the volumetric flow rate of liquids and gasses through a pipe. Two orifice flanges are called an orifice flange union. Each flange comes with two pipe taps for measuring the pressure drop of the flow through an orifice plate. Orifice plates do not come with the flanges and are sized based on the requirements of the process. Two jack screws are used to spread the flanges apart in order to change the orifice plate. This flange is normally available in weld neck, slip-on, and threaded flanges. These flanges have a raised face.
Orifice flanges are installed in a straight run of pipe in order to avoid turbulence at the plate. As a rule of thumb, an orifice flange has ten diameters of straight pipe upstream and five diameters of pipe downstream. There are guidelines set out in (American Gas Association) AGA Report #3 which is the Orifice Metering of Natural gas.
When installing the orifice plate flange the pressure taps need to be at the same elevation to each other. The assumption when making the calculation for the orifice plate is that static head of the tubes is the same on both sides of the orifice plate. Pressure taps should not be installed facing down as the taps could become plugged with debris in the line.
Weldneck orifice flanges are butt-welded into the pipeline. The inside diameter (bore diameter) of the pipe should be specified when ordering. Weldneck orifice flanges are available in ANSI classes 300, 600, 900, 1500 and 2500. They are not available in ANSI 150 sizes because the thickness of ANSI 150 flanges are not enough to allow for drilling pressure taps.
The range of orifice flanges covers all standard sizes and ranges, and all common flange materials. Flanges are available in Welding Neck, Slip On, and Threaded form, and are typically supplied with two 1/2″ NPT tappings in each flange.
ASME B16.36 covers Dimensions and dimensional tolerances from orifice flanges (similar to those covered in ASME B16.5) that have orifice pressure differential connections.
The range of orifice flanges covers all standard sizes and ranges, and all common flange materials. Flanges are available in Welding Neck, Slip On, and Threaded form, and are typically supplied with two 1/2″ NPT tappings in each flange.
One of the common characteristics of a metal pipeline is the inherent movement caused by fluid flow, as well as expansion and contraction from temperature changes.
When a pipeline makes a sharp turn, the fluid attempts to push the pipe in the direction of flow. By installing an anchor flange and securing it into a reinforced concrete block buried deep underground, these forces are safely transferred to the earth.
For large-diameter, high-pressure, long-distance oil and gas pipelines, anchor flanges serve as critical structural supports. They are typically installed underground or buried to ensure stability and long-term performance.
Copper Plated Anchor Flange
Anchor Flange is a device that is installed on the lines of the piping system to deal with the axial movement and prevent the movement of the pipeline.
So, in the continuation of this article, we will discuss the applications, features and raw materials of this type of flange.
Finally, Anchor Flange is a type of flange that is mainly used to connect pipes to other structures. This type of flange is usually made of carbon steel, alloy steel and stainless steel.
Anchor flanges are critical components used to restrain pipeline movement, designed with precision to handle high loads and ensure long-term reliability.
Designed with weld chamfers that precisely match the wall thickness of the pipeline.
Common materials include SA 105 and high-strength alloys such as SA 694 F52, F60, F65, F70.
Standard sizes up to 42 inches, with larger custom sizes available upon request.
Engineered in compliance with ASME VIII Div.1, based on customer-provided process data sheets.
Commonly used to restrain pipeline axial movement and absorb high-load stresses in critical systems.
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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