Flat and Lap Joint flanges

Flat and lap-joint flanges: a wide range of diameters, designs, and materials. Check prices and order directly from the manufacturer. Delivery to the destination point. ASME flat and lap-joint flanges are designed to provide reliable and leak-tight connections in pipeline systems operating under high pressure, temperature fluctuations, and exposure to aggressive chemical environments. They are widely used in the oil and gas, chemical, power generation, and thermal energy industries. The flanges are manufactured from carbon steel, stainless steel, as well as duplex and super duplex alloys, ensuring strength, durability, and corrosion resistance. Deliveries are carried out on schedule, enabling the implementation of projects of any complexity, supporting uninterrupted equipment operation, and maintaining construction or reconstruction timelines for industrial facilities.

Types of ASME flat flanges

Flat flanges are classified according to the design of the sealing surface and their intended application, which makes it possible to select the optimal option for specific operating conditions. The main types include:

- flanges with a smooth flat face;

- flanges with raised faces or grooves for sealing gaskets;

- ASME lap-joint flanges with bolt holes used for reinforced connections;

- designs with large or small raised faces or recesses for pipes of different diameters and systems with increased requirements for joint accuracy.

All products are manufactured in accordance with ASME B16.5 and ASME B16.47 standards, ensuring compatibility with international industrial systems.

Dimensions of flat flanges according to ASME

Standardization of ASME flat flange dimensions ensures precise matching with pipeline diameter, operating pressure, and temperature conditions. ASME B16.5 standards regulate flange diameter, wall thickness, bolt hole location, and allowable tolerances. This guarantees reliable connections and compatibility with valves, pipes, and other equipment.

Products made from carbon steel (ASTM A105), stainless steel (ASTM A182 F304/F316), and duplex alloys provide resistance to corrosion and thermal stress. Due to compliance with ASME and ASTM standards, flat flanges retain their performance characteristics even under intensive operation in demanding industrial environments.

FAQ

1. What is the difference between a flat flange and a weld neck flange?

A flat flange has a smooth seating surface and is attached to the pipe by welding or bolting, unlike a weld neck flange, which has a tapered neck and is used in high-pressure applications.

2. What are flat steel flanges used for?

They are used for leak-tight connections of pipelines in gas supply systems and at industrial facilities.

3. What types of flat flanges exist?

Common types include butt-weld, threaded, smooth (lap-joint), and versions with different materials or coatings such as carbon steel or stainless steel.

4. How do you choose a flat flange according to pipe diameter?

The flange diameter must correspond to the outer diameter of the pipe, while also considering the number of bolt holes and the system’s operating pressure.

5. What standards are considered in the manufacturing of flat flanges?

Flat flanges are produced in accordance with DIN and other international standards. These standards regulate dimensions, manufacturing materials, pressure class, and welding requirements to ensure reliable and leak-tight pipeline connections.

Comments

Comment 1: Which flat flange sizes are most commonly used for water pipelines?

Flanges with diameters DN 50, DN 80, and DN 100 are commonly used. The exact size depends on the pipe diameter and system pressure. The dimensions and number of bolt holes are specified according to EN and DIN standards.

Comment 2: Which flat flanges are recommended for outdoor water pipelines?

For outdoor systems and aggressive environments, stainless steel flanges are recommended. They are resistant to corrosion and last significantly longer than standard steel alternatives, especially in conditions of constant humidity.