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The threaded Flanges is used for special circumstances

2017-11-14 11:47:57   COMMENT:0 HITS:
  The threaded Flanges is used for special circumstances with their main advantage being that they can be attached to the pipe without welding.  Sometimes a seal weld is also used in conjunction with the threaded connection.  This special type of flange is generally used for high pressure piping system, yet smaller diameter applications.  Obviously, the larger the flange is, the harder the ability to machine a thread would be.

  The Threaded flanges are usually supplied with a raised face (RF) or flat face (FF) sealing face. When a raised face is necessary for threaded pipe flanges, the standard height should be 1/16″ for the face under class400, If the threaded pipe flanges is same or more than class 400 , the standard threaded pipe flange raised face height should be 1/4″.

  The A182 F53 150# RF Stainless Steel Threaded Flange commonly used in a small sizes and not very high pressure situation. The threaded flange is no welding in the joint ,it means the flange could be used for some situations which is not able to arrange a welding work.

  These pressure classes also have differing pressure and temperature ratings for different materials. Unique pressure classes for piping can also be developed for a process plant or power generating station; these may be specific to the corporation, engineering procurement and construction (EPC) contractor, or the process plant owner. The ANSI/ASME pressure classes for Flat-Face flanges are 125# and 250#. The classes for Ring-Joint, Tongue & Groove, and Raised-Face flanges are 150#, 300#, (400# - unusual), 600#, 900#, 1500#, and 2500#.

  The flange faces are also made to standardized dimensions and are typically "flat face", "raised face", "tongue and groove", or "ring joint" styles, although other obscure styles are possible.

  Flange designs are available as "weld neck", "slip-on", "lap joint", "socket weld", "threaded", and also "blind".

  ASME standards (U.S.)

  ASME type flange on a gas pipeline

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