Dual Arch

Rubberexpansionjoint.com DA style molded dual arch rubber expansion joints are designed to absorb movements and stress on piping systems, compensate for pipe misalignment, reduce vibration and system noise. The style DA protects against start-up forces as well as system surges. All DA style joints come standard with ANSI 150# solid floating metallic flanges and metallic root rings. The design of the DA style does not contain any metallic reinforcement in the carcass of the bellows. Instead the carcass has a minimum of four layers of high tensile synthetic fabric. Each layer is impregnated with a rubber or synthetic compound. This allows movement and flexibility between the layers of fabric. The DA style design has a long radius arch allowing for self cleaning and thus eliminating the need for a filled arch. The DA style is the most economic choice when it comes to dual arch rubber expansion joints. The DA is available on request to meet the requirements of the U.S.C.G.

Remarks:

• The joint body is available in 3 standard combinations of the (tube/cover): EPDM/EPDM, Neoprene/Neoprene, and Nitrile/Neoprene. The body components (tube/cover) are also available in a combination of the following additional materials on special order: Neoprene, EPDM, Chlorobutyl, Butyl, Nitrile, Hypalon®, Viton®, natural rubber etc. Please see the materials table to determine what material is best for your application.
• Standard flange drilling is ANSI 150#. Also available ANSI 25/125/250/300#, Navy, DN, BS, and JIS Drilling as well as others.
• Standard flange material is carbon steel with a plated rust inhibitor. Also available T-304, T-316 and other alloys.
• All Movements are non-concurrent. Contact www.rubberexpansionjoint.com to determine if your concurrent movements are acceptable.
• See the “Control Unit” page to determine if your application requires control units. Control units must be used to protect the joint if the piping is not properly anchored. Control units are sold separately from the rubber joint.
• Gaskets are not required with the DA series rubber joint as long as a “flat-face” type mating flange is used. If this is not an option and a “raised face” type flange is used then a ring gasket should be used to avoid cutting the sealing face of the rubber bead.

Notes:

1. Control unit (3 Rod) Standard
2. Control unit (4 Rod) Standard
3. Maximum working pressure is based on 190° F. See Temperature vs. Pressure chart for operating temperatures above 190° F.
4. Test pressure is 1.5 times working pressure. Burst pressure is approximately 4 times maximum working pressure.
5. The vacuum rating is based on the joint installed in the neutral length. Joints should not be installed in the extended position on vacuum applications. Please advise if the joint will be subjected to full vacuum. The use of an internal vacuum ring may be necessary.