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A Look at Design in ASME Flanges for Pressure Vessel Connections

Pressure vessel connection manufacturers have a wealth of industrial flanges that are semi-forged to choose from for your project. But which pressure vessel connections are right for you? Here are three design considerations for ASME pressure vessel connection manufacturing products:


Steel is the most common material choice for forged flanges, but different steel grades are suitable for different pressure and temperature requirements. Steel grade A105, for example, is a carbon steel suitable for temperatures between -20°F and 1000°F. Grade A350-LF2 CL1 is another carbon steel produced for lower temperatures, from -50°F to 650°F. Alloy steels provide yet more temperatures options. A182-F11 CL2 steel contains 1.25 percent chromium and .5 percent molybdenum and works well from -20°F to 1100°F.


While there are a variety of structures for pipe flanges, only some can withstand high pressure. Socket-weld, threaded-neck, and slip-on, for example, do not meet the industry’s connection specifications.

  • Blind flanges, however, are a reliable option for connection manufacturers. Blind flanges are similar in structure to shell covers, though they can be disassembled more easily. Like shell covers and pipe caps, they provide a complete seal to block off the material flow.
  • Long weld necks are another popular choice for custom pressure vessel flange connections in the power and petroleum industries. Long weld necks allow for greater pressure control within pipes and can be butt-welded to the pipe for extra strength.

Flange Faces

These are another design factor. There are three general types of flange faces: flat face, raised face (RF), and ring-type joint (RTJ). Flat-face flanges are suitable only for low-pressure applications. RF and RTJ faces, however, are both common choices. RF flange faces are a cheaper option, but RTJ faces offer a better seal at higher pressures.

Call Our Pressure Vessel Connections Flange Manufacturers

Forged Components, Inc. provides carbon steel manufacturing, including blind, large diameter, and long weld necks. For more information on our forged pressure vessel components, contact us online or call us at (281) 441-4088.