Knowledge Series: Special Flange Type Expansion Joints
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Special Flange Type: Introduction
• What is a Special Flange Type rubber expansion joint?
• A special flange type rubber expansion joints is an expansion joints with modifications to their flanges including enlarged flanges, different drill patterns and weld-end stubs.
• Benefits of a Special Flange Type rubber expansion joint:
• Can be furnished with custom drill patterns other than standard available flange drillings
• Can have custom drill pattern on each end of expansion joint for unique installations
• Included in this section:
• Enlarged Flange Type
• Weld-End Type
• Raised face flanges
Special Flange Type: Enlarged Flange Type
• Enlarged Flange Type:
• Expansion joints utilizing a full-face integral flange design can be furnished with an enlarged flange on one end. (For example, an 8” (203 mm) expansion joint can be fabricated with a flange to mate to an 8” (203 mm) pipe flange on one end; and a 12” (305 mm) flange on the other end to mate to a 12” (304 mm) pipe flange.) Additionally, drilling of different specifications may be furnished. For example, an expansion joint can be furnished with one end drilled to ANSI B16.5, Class 150, and the other end drilled to MIL-F-20042C.
• Design Notes:
• Expansion joint with full face integral flanges of dissimilar drill patterns
• Example: one flange drilled to ANSI 150# and opposite flange drilled to ANSI 300#
• Special/customized drilling configurations available
Special Flange Type: Weld-End Type
• Weld-End Type:
• Several manufacturers offer an expansion joint with weld-end nipples which allow the unit to be directly welded into place on the job or welded to associated equipment before final installation. The design is basically the Sleeve Type expansion joint bonded to matching steel weld-end nipples. Normally, there are steel band clamps around the periphery of the rubber sleeve end to reinforce the rubber-metal bond.
• Design Notes:
• Design notes
• Expansion joint furnished with weld-end fittings instead of integral rubber flanges
• Rubber is bonded with metal coupling and clamped for reinforcement
• Coupling ends can be welded to adjacent pipe sections
Sleeve Type
For additional technical information regarding Sleeve Type rubber expansion joints as well as other rubber expansion joint designs consult the Fluid Sealing Associations Technical Handbook for Expansion Joints Piping (https://www.fluidsealing.com/)
