Threaded flanges

Threaded flanges are a type of flange with an internal thread designed for mounting onto a pipe without the use of welding. This threaded connection ensures tightness and high mechanical strength while eliminating the need for thermal impact on the pipeline. These flanges are distinguished by their simplicity and ease of installation, providing reliable pipe fixation and making them well-suited for operation under medium pressure and temperature conditions.

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Name	Flange type	Nominal diameter, DN	Nominal size, NPS (inch)	Standard	Steel grade	Type of connecting surface	Weight 1 pc (kg)
Stainless steel threaded sleeve flange DN15 PN25 Type 13/B1 EN 1092-1	Type 13 - threaded	15	—	EN 1092-1	X2CrNiMo17-12-3 / 1.4432	Type B - with connecting projection	0.72
Stainless steel threaded sleeve flange DN15 PN25 Type 13/B1 EN 1092-1	Type 13 - threaded	15	—	EN 1092-1	X2CrNiMoN25-7-4 / 1.4410	Type B - with connecting projection	0.72
Stainless steel threaded sleeve flange DN15 PN25 Type 13/B1 EN 1092-1	Type 13 - threaded	15	—	EN 1092-1	X1NiCrMoCuN25-20-7 / 1.4529	Type B - with connecting projection	0.72
Stainless steel threaded sleeve flange DN15 PN25 Type 13/B1 EN 1092-1	Type 13 - threaded	15	—	EN 1092-1	X2CrNiMoN22-5-3 / 1.4462	Type B - with connecting projection	0.72
Stainless steel threaded sleeve flange DN15 PN25 Type 13/B1 EN 1092-1	Type 13 - threaded	15	—	EN 1092-1	X1NiCrMoCu25-20-5 / 1.4539	Type B - with connecting projection	0.72
Stainless steel threaded sleeve flange DN15 PN25 Type 13/B1 EN 1092-1	Type 13 - threaded	15	—	EN 1092-1	X1CrNiMoCuN20-18-7 / 1.4547	Type B - with connecting projection	0.72
Stainless steel threaded sleeve flange DN15 PN25 Type 13/B1 EN 1092-1	Type 13 - threaded	15	—	EN 1092-1	X6CrNiNb18-10 / 1.4550	Type B - with connecting projection	0.72
Stainless steel threaded sleeve flange DN15 PN25 Type 13/B1 EN 1092-1	Type 13 - threaded	15	—	EN 1092-1	X6CrNiTiB18-10 / 1.4941	Type B - with connecting projection	0.72
Stainless steel threaded sleeve flange DN15 PN25 Type 13/B1 EN 1092-1	Type 13 - threaded	15	—	EN 1092-1	X6CrNiTi18-10 / 1.4541	Type B - with connecting projection	0.72
Stainless steel threaded sleeve flange DN15 PN25 Type 13/B1 EN 1092-1	Type 13 - threaded	15	—	EN 1092-1	X6CrNiMoTi17-12-2 / 1.4571	Type B - with connecting projection	0.72

Threaded flanges for reliable pipeline connections. The range includes models made from carbon, alloy, corrosion-resistant, duplex, and super duplex steels in accordance with ASME standards, with internal threads in various diameters. Threaded flanges are designed to connect pipelines without welding, providing a leak-tight and reliable fastening in systems operating under high pressure and temperature. Their design allows quick installation and dismantling of pipeline components, which is especially important during maintenance or equipment upgrades. The flanges are manufactured from carbon steel, stainless steel, as well as corrosion-resistant and heat-resistant alloys that ensure stable performance, resistance to aggressive chemical environments, and a long service life. The products comply with ASME requirements (in particular ASME B16.5), confirming their reliability and international quality standards.

Threaded flange: design and types of connections

An ASME threaded flange is a disk with an internal thread that connects a pipe to another flange or fitting without welding. Depending on operating conditions, different types of sealing surfaces are selected:

- with raised faces;

- with grooves for sealing gaskets;

- with tongue-and-groove surfaces for precise alignment.

This design ensures tightness, installation accuracy, and reliability of the joint. Standardization according to ASME B16.5 guarantees compatibility with pipes, fittings, and industrial equipment, reducing the risk of leaks and simplifying maintenance of pipeline systems.

Application of threaded flanges

ASME threaded flanges are widely used in the oil and gas, chemical, and power generation industries. They are especially востребованы where quick assembly and disassembly of pipelines is required:

- in hot oil and gas transportation lines;

- in systems with aggressive chemical substances;

- in installations where welding is impossible or undesirable;

- at facilities where regular dismantling is required for maintenance and equipment upgrades.

Compliance with international standards such as ASME B16.5, API, and EN ensures reliable connections, compatibility with other pipeline components, and safe operation even under high loads and extreme temperatures.

FAQ

1. How do ASME threaded flanges differ from welded flanges?

Threaded flanges allow pipes to be connected without welding, which simplifies installation and dismantling of the system. Unlike welded connections, they allow quick replacement of components and convenient maintenance while maintaining tightness and strength.

2. In which industries are ASME threaded flanges used?

Threaded flanges are used in the oil and gas, chemical, and power generation industries. They are suitable for transporting oil, gas, and aggressive chemical substances, especially where welding is not possible or regular pipeline disassembly is required.

3. What standards regulate threaded flanges?

Threaded flanges are manufactured in accordance with ASME B16.5 as well as international standards such as API and EN. These standards define dimensions, bolt hole locations, wall thickness, and permissible tolerances, ensuring compatibility and safe operation of pipeline systems.

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