Expansion Joint Molded Arch Type - Bachmann Dampjoint Inc.

MOLDED ARCH TYPE EXPANSION JOINTS

The arch type expansion joint is a flexible connector fabricated of natural or synthetic elastomers, to provide stress relief in piping systems due to thermal changes.

Engineers can solve anticipated problems of vibration, noise, shock, corrosion, abrasion, stresses and space by incorporating arch type expansion joints into designed piping sytems.

Advantages of this type of joints include:

Minimal face to face dimension
Light weight
Low movement force requirement
Reduced fatigue factor
Reduced heat loss
Corrosion resistance

Single Arch Type. Construction is of fabric and rubber, reinforced with metal rings or wire. The full face flanges are integral with the body of the joint and drilled to conform to the bolt pattern of the companion metal flanges of the pipeline. This type of rubber faced flange is of sufficient thickness to form a tight seal against the metal flanges without the use of gaskets. The shortest face-to-face dimensions are available with this type of construction.

Multiple Arch Type. Joints with two or more arches may be manufactured to accommodate movements greater than those of which a Single Arch Type joint is capable. Multiple arch joints are composites of standard sized arch-es and are capable of movements of a single arch multiplied by the number of arches. The minimum length of the joint is dependent upon the number of arches. In order to maintain lateral stability and prevent sagging when the joint is installed in a horizontal position, a maximum number of four (4) arches are recommended.

Filled Arch Type. Standard arch type expansion joints may be supplied with a bonded-in place soft rubber arch filler to provide a smooth interior bore. Filled arches built as an integral part of the carcass decrease the flexibility of the joint and should be used only when necessary. Movements of expansion joints with filled arches are limited to 1/2 the normal movements of comparable size expansion joints with unfilled (open) arches.

“TAPER” REDUCER TYPE: Tapered expansion joints are used to connect piping of unequal diameters. They may be manufactured as concentric taper joints with the axis of each end concentric with each other or as eccentric taper joints having the axis of each end offset from each other. Tapers in excess of 15° are not desirable. Recommendations concerning the degree of taper and working pressures should be obtained from the manufacturer of choice. Normally, pressures are based on the larger of the two inside dimensions. Available with or without arches.

OFFSET TYPE:

Offset joints are custom built to specifications to compensate for initial misalignment and nonparallelism of the axis of the piping to be connected. Offset joints are frequently used in close quarters where available space makes it impractical to correct misalignment with conventional piping.