Threaded Flanges Suppliers

Threaded flanges are primarily used in low-pressure, non-cyclic applications where welding is either not possible or not recommended.

These flanges are ideal for flammable, hazardous, and high-temperature environments because they eliminate the need for welding — which can ignite volatile substances. Threaded connections allow for easy assembly and disassembly, making them ideal for:

1. Petroleum and gas systems where explosive gases are present
2. Chemical processing pipelines with reactive substances
3. Steam lines with moderate pressure and temperature
4. Fire protection and sprinkler systems
5. Marine and offshore platforms, especially for quick repairs

Threaded flanges offer convenience in maintenance and are often chosen when the piping system needs to be frequently dismantled or modified without compromising safety.

Threaded flanges can be used in underground or buried piping systems, but with limitations and specific considerations:

• Corrosion Protection: Since buried conditions expose flanges to moisture and chemicals, coatings like epoxy, galvanization, or wrapping are essential to prevent external corrosion.
• Sealing Concerns: Threaded joints can loosen over time due to thermal expansion or soil movement. Using thread sealants or PTFE tape is mandatory, but not always sufficient for high-reliability systems.
• Access Requirements: Unlike welded flanges, threaded flanges are easier to assemble or disassemble, making them suitable for locations that may need future maintenance access.

Best Practice: In critical underground systems, especially those handling hazardous or high-pressure media, welded flanges or other robust joint types are typically preferred over threaded connections due to their superior sealing reliability.

Yes, but only under specific conditions and material compatibility.

Threaded flanges (also known as screwed flanges) are generally preferred for low-pressure and non-cyclic services, but they can be used in high-temperature or even cryogenic environments if:

1. The material grade is suited to the temperature range (e.g., Stainless Steel 304/316 for high-temp, Inconel or Monel for cryogenic).
2. Proper thread engagement and sealing method (like PTFE tape or sealant) are applied to prevent leaks.
3. There is no excessive vibration or thermal expansion, which could damage the threads.

For extreme temperatures or pressure fluctuations, weld neck or socket weld flanges are typically recommended due to their better mechanical strength.

Threaded flanges stand out for their ease of installation, especially in systems where welding is not feasible or allowed, such as flammable or hazardous environments. Unlike Socket Weld and Weld Neck Flanges, threaded flanges do not require welding — the pipe is simply screwed into the flange using a tapered thread (typically NPT or BSP).

In terms of performance:

• Threaded flanges are ideal for low-pressure and non-cyclic systems, where quick disassembly is needed.
• Socket Weld flanges offer a stronger connection for small-bore high-pressure pipelines, requiring a fillet weld.
• Weld Neck flanges, with their tapered hub and butt-welded design, are best suited for high-pressure, high-temperature, and critical stress applications.

Each flange type serves a distinct purpose, and the choice depends on pressure rating, piping environment, and maintenance requirements.

Threaded flanges are manufactured with different thread standards, most commonly NPT (National Pipe Thread) and BSP (British Standard Pipe). The thread type directly affects compatibility with the connected pipe:

• NPT Threads (used in the USA and ANSI systems): Feature a tapered design that provides a tight seal through thread interference. Commonly used with ASME B1.20.1 specifications.
• BSP Threads (used in Europe, Asia, and Middle Eastern countries): Available in two variations – BSPT (tapered) and BSPP (parallel). BSPT is more similar to NPT, but not interchangeable due to different thread angles and pitch.

Why it matters:
Using the wrong thread standard can lead to leaks, mechanical failure, or unsafe connections. Always verify that both the pipe and flange have matching thread types and standards before installation.

Nutech Overseas is a globally recognized manufacturer and exporter of high-quality threaded flanges, delivering to clients across multiple continents. We specialize in supplying threaded flanges in Stainless Steel, Carbon Steel, Alloy Steel, Duplex, Super Duplex, and Nickel Alloys, tailored to meet international standards.

Our key export destinations include:

• United States – Supplying to oil & gas, refineries, and pressure equipment fabricators.
• Europe – Including Germany, France, Italy, Spain, and Eastern European countries.
• Middle East – UAE, Saudi Arabia, Qatar, Oman, and Kuwait, for petrochemical and offshore platforms.

With on-time delivery, competitive pricing, and adherence to ASME, EN, DIN, and ISO standards, we have built a strong global footprint. Custom markings, third-party inspections (TPI), and country-specific documentation are also provided based on client needs.