Proco Products, Inc.

- Model Style 231 - Single Wide Arch Rubber Expansion Joints

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Proco Style 231 single wide arch rubber expansion joints are built to withstand even the most rigorous piping system configurations. They are single wide-arch products, specifically constructed to reduce or eliminate common occurrences such as noise and vibration, misalignment/offset, or turbulence. Style 231 expansion joints are appropriate for a wide variety of industrial applications, and are available in open arch and filled arch configurations.

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Some of the notable features and benefits of the Proco Style 231 are:

  • Absorption of Directional Movement
  • Less Turbulence or Material Entrapment
  • Absorption of Vibration, Noise and Shock
  • Compensation for Misalignment
  • Wide Range of Service and Lighter Weight
  • Easy Material Identification

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Absorbs Directional Movement
Thermal movements appear in any rigid pipe system due to temperature changes. The Series 230 wide arch expansion joints allow for axial compression or axial extension, lateral deflection as well as angular and torsional movements. (Note: Rated movements in this publication are based on one plane movements.

Multiple movement conditions are based on a multiple movement calculation.)

Less Turbulence or Material Entrapment
The Series 230 expansion joints are manufactured with the integral rubber flange joining the body at a true 90º angle. This ensures the product will install snug against the mating pipe flange free of voids creating less turbulence in the pipe system. The Series 230 is also available with a filled arch for applications that have 20% or more solids in the process.

Absorbs Vibration, Noise and Shock
The Proco Series 230 rubber expansion joints effectively dampen and insulate downstream piping against the transmission of noise and vibration generated by mechanical equipment. Noise and vibrations caused by equipment can cause stress in pipe, pipe guides, anchors and other equipment downstream. The Series 230 expansion joints will help relieve noise and vibration occurrences in a pipe system. Water hammer and pumping impulses can also cause strain, stress or shock to a piping system. Install the Series 230 to help compensate for these system pressure spikes.

Compensates for Misalignment
Rubber expansion joints are commonly used by contractors and plant personnel to allow for slight pipe misalignment during installation of new piping and or replacement applications. (Although rubber expansion joints can be made with permanent offsets, it is suggested that piping misalignments be limited to no more than 1/2 the rated catalog movement.)

Wide Service Range and Less Weight
Engineered to operate up to 200 PSIG (nominal size dependent) Or up to 250ºF (elastomer dependent), the Series 230 can be specified for a wide range of piping system requirements. The Series 230 rubber expansion joints are constructed in various elastomers with rubber impregnated polyester tire cord and reinforced with wire to create a product with greater operating performance.

Material Identification
All Series 230 expansion joints are strip branded with cure dates and elastomer designations.
All Neoprene Tube/Neoprene Cover (NN) and Nitrile Tube/Neoprene Cover (NP) elastomer designated joints meet the Coast Guard Requirements and conform to ASTM F 1123-87.

Large Inventory
Proco Products, Inc. maintains one of the largest inventories of rubber expansion joints in the world.

Notes:
All products are reinforced with Polyester Tire Cord

  1. Expansion Joint “Cover” can be coated with CSM UV Resistant Coating.
  2. All NN & NP elastomer designated joints meet the Coast Guard Requirements and conform to ASTM F 1123-87 and are marked accordingly.
  3. Branding Label will be marked as “Food Grade”.
  4. All elastomers above are not intended for steam service.
  5. BB or EE are good for 300°F blower service at 20 PSI or less.

A control rod unit consists of limit rods, tie rods, or compression sleeves, and a control unit assembly is a system of two or more control rod units placed across an expansion joint from flange to flange. Its purpose is to minimize possible damage caused by excessive motion of a pipeline. Control unit assemblies can be set at the maximum allowable expansion and / or contraction of the rubber expansion joint.

When used properly, control unit assemblies serve as additional safety enhancements, and can minimize possible damage due to adjacent equipment.

Rubber expansion joints should be installed between two fixed anchor points in a piping system. When proper anchoring can’t be provided, control units are required.When an un-anchored piping system is encountered, nuts should be tightened securely against the rod plate, to prevent over-extension due to pressure thrust caused by the expansion joint.

Listed below are three control unit configurations supplied by Proco that are commonly used with rubber expansion joints in piping systems.

  • Figure 1 – Limit Rod: A limit rod control unit configuration will allow an expansion joint to lengthen to a predetermined extension setting. Spherical washers can also be furnished (upon request) to combat any “nut to plate” binding during offset.
  • Figure 2 – Limit / Control Rod: This type of configuration is used to allow specified pipe expansion (expansion joint axial compression) and pipe contraction (expansion joint axial extension) movements. Spherical washers can also be furnished (upon request) to combat any “nut to plate” binding during offset.
  • Figure 3 – Compression Sleeve: A compression sleeve configuration is used to allow for specified pipe expansion (expansion joint axial compression) and pipe contraction (expansion joint extension) movements. Proco will supply each compression sleeve equipped to allow for no axial movement, unless otherwise specified at time of purchase. Spherical washers can also be furnished (upon request) to combat any “nut to plate” binding during offset.

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