Description

Threaded flanges, also known as screwed flanges, are a type of flange with threaded holes that allow for easy installation onto pipes or fittings with matching threads. Here’s a detailed description of threaded flanges:

  1. Threaded Holes: Threaded flanges have internal threads machined into their bore. These threads are typically tapered to create a tight seal when the flange is screwed onto a pipe or fitting with matching external threads.
  2. Pipe Compatibility: Threaded flanges are designed to be compatible with pipes or fittings that have external threads of the same size and thread type. Common thread types include NPT (National Pipe Thread), BSP (British Standard Pipe), and others.
  3. Sealing: Threaded flanges rely on the threads to create a seal between the flange and the pipe or fitting. To ensure a leak-proof connection, thread sealant or thread tape is often applied to the threads before installation.
  4. Installation: Installing threaded flanges involves simply screwing them onto the pipe or fitting until they are snug and the threads are fully engaged. Care should be taken not to over-tighten the flange, as this can damage the threads or distort the flange.
  5. Applications: Threaded flanges are commonly used in low-pressure piping systems, particularly in smaller pipe sizes where welding may be impractical or where frequent disassembly is required. They are often found in applications such as plumbing, water supply, and low-pressure steam systems.
  6. Materials and Standards: Threaded flanges are available in a variety of materials, including carbon steel, stainless steel, brass, and others, to suit different applications and operating conditions. They are manufactured according to industry standards such as ASME B16.5, ASME B16.11, and others.
  7. Limitations: While threaded flanges offer ease of installation and disassembly, they may not be suitable for high-pressure or high-temperature applications due to the potential for leakage at the threaded connection. In such cases, welding neck or slip-on flanges may be preferred.

Threaded flanges are a versatile option for connecting pipes and fittings in a wide range of industrial and commercial applications. They offer convenience, ease of installation, and flexibility, particularly in situations where welding is not feasible or practical.

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