Threaded Flange

Product Description

1. Product Introduction

Threaded Flanges offer a unique advantage in industrial piping: they can be installed without welding, which eliminates the need for hot-work permits, certified welders, and weld inspection on the flange joint itself. The flange simply screws onto a male-threaded pipe end and is drawn up tight against the pipe face. A back-weld around the hub OD may be specified for higher-pressure or critical service to reinforce the thread joint. The primary limitation of threaded flanges is the thread itself: the stress concentration in the threaded bore and the limited engagement depth mean they are only suitable for lower-pressure service — typically CL300 or below. They are also not suitable for toxic, flammable, or high-pressure gas service where thread leakage would be hazardous. The key applications are in water distribution, compressed air, firewater, and utility systems where the ability to disassemble the joint without cutting the pipe is a significant maintenance advantage. In practice, threaded flanges are most commonly used for pipe sizes 1/2" to 4", as the torque required to make up the joint becomes impractical for larger sizes. The NPT (National Pipe Thread) form is the US standard; BSP (British Standard Pipe) is used in Europe and many export markets.

2. Product Features

- Sizes from 1/2" to 6" NPS — standard threaded connection range

- Pressure ratings up to CL300 (ASME B16.5); PN10/PN16/PN25/PN40 (EN)

- NPT (American) and BSP (European) thread forms available

- Weld-free installation eliminates hot-work permits and certified welding

- Demountable joint allows rapid pipework removal for maintenance

- RF, FF facing options for all standard gasket types

3. Core Specifications

Parameter	Specification
Size Range	1/2" – 6" NPS
Pressure Rating	CL150 – CL300 (ASME B16.5); PN10/PN16/PN25/PN40 (EN)
Thread Form	NPT (American), BSP (European/British)
Facing	RF (Raised Face), FF (Flat Face)
Installation	Weld-free — screws onto male-threaded pipe end
Demountable	Yes — can be removed without cutting pipe
Materials	Carbon steel, alloy steel, stainless steel
Standards	ASME B16.5, AWWA C207, EN 1092-1
Certifications	API, ISO 9001, ISO 14001, ISO 45001, CE

4. Materials

5. Product Standards

- ASME B16.5 — Pipe Flangesand Flanged Fittings (1/2" – 6")

6. Applications

- Water treatment plant and municipal water distribution piping connections

- Firewater ring main and hydrant connections in industrial facilities

- Compressed air distribution in factories and process plants

- Low-pressure steam and condensate return lines in heating systems

- Tank vent and overflow connections in storage tank farms

- Instrument air and plant air header connections in industrial facilities

7. Packaging

8. Customization

BSP and NPT thread combinations for different market requirements, special back-weld preparations for higher-pressure threaded service, and special alloys for seawater or corrosive water service.

For detailed specifications and applications, explore this product page.

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