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Everything listed under: Expansion Joints

  • How Expansion Joints Prevent Catastrophic Failures

    To avoid catastrophic failutres a critical requirement in any steam system is accounting for pipe expansion. 

    As pipes heat up with high pressure steam, pipes can grow up to 8 inches for every 100 feet. That growth can exert forces that break loose pipe guides and cause catastrophic failures. In order to avoid that two highly effective ways to accommodate thermal expansion is with slip and ball type expansion joints. Check out the video above which illustrates how both types of joints work. 

    Slip Type Expansion Joints

    Advanced Thermal Systems (ATS) offers packed slip type expansion joints that provide an economical, safe, and reliable method of absorbing large amounts of axial pipe expansion and are ideal for systems with long straight pipe runs. Special configurations are available to accommodate as much as 24" of expansion in both single and double (48" total) expansion joints for service conditions to 1000 psig at 750°F. 

    Flexible Ball Type Expansion Joints

    ATS packed ball type expansion joints provide an economical, safe, and reliable method of absorbing large amounts of single and multiple plane displacements including rotation. Ball joints are ideal for systems with vertical pipe runs and/or natural offsets. These joints are designed to accommodate 15° to 33° of angular flex and 360° of rotation.

    Standard ball and slip joints include such special features as:

    • A high performance injectable packing which is suitable for operation at temperatures up to 1000°F.
    • Packing cylinder designs that allow in service packing of the joint and uninterrupted process at pressures up to 1000 psig.
    • Low friction nonmetallic internal and external guides to offer further protection of the hard chrome plated sliding slip.

    Because expansion joints’ internal and external guides must be concentric it's important to have the most reliable joint possible. For recommendations on the right slip or ball type expansion joints for your system, contact the team at Campbell-Sevey

     


  • Having issues with Pipe Expansion? Install Expansion Joints

    A critical requirement in any steam system is accounting for pipe expansion as the lines are heated. With high temperature steam, pipes can grow up to 8 inches for every 100 feet.

    Without specifically engineered equipment to take these expansions into account, the pipe growth can exert forces that break loose pipe guides and cause catastrophic failures.

    Two highly effective and safe ways to accommodate for the thermal expansion is with slip and ball type expansion joints. Check out the video above which illustrates how both types of joints work. 

  • Advantages and Disadvantages of Bellows and Packed Slip Type Expansion Joints

    The following is a comparison of the advantages and disadvantages of both bellows and
    packed slip type expansion joints.

    Bellows Type Expansion Joints 

     
     Advantages  Disadvantages
     

    • Bellow joints do not require access; i.e. They can be direct buried, however a telltale is recommended
    • No maintenance is required.


    • Bellows joints can fail catastrophically.
    • No in place maintenance or repair can be performed - they must be replaced if damaged.
    • Require that the system be shut down when a failure occurs.
    • Chance of personal and/or property damage when failure occurs.
    • Installer can easily misuse joints when correcting for pipe misalignment.

     
     

    Packed Slip Type Expansion Joints

     
     Advantages  Disadvantages
     

    • No catastrophic failure mode.
    • Fabricated from materials similar to the pipe line.
    • Rugged construction - the wall thickness of every part of the expansion joint is at least as heavy as that of the system in which they are installed.
    • In the event that a leak occurs there is no need to shut the system down for repairs.
    • Allow for safe packing injection under full line pressure.


     

    • Must be located to allow access for inspection and maintenance.
    • May require occasional addition of injectable packing.


     Contact Campbell-Sevey to learn more about how we can assist you with your expansion joint needs.

  • Beware of Low Priced Expansion Joints

    Everybody loves a bargain, however some bargains come at a high price. Expansion joints are designed with internal and external guides, which are integral with the joint’s stuffing box. The guides require close tolerance for effective guiding of the sliding slip and are critical to leak-free operation, but to be effective these guides must be concentric with each other. This requires costly manufacturing expense.

    Over the years Advanced Thermal Systems (ATS) has experimented with the welding techniques of the weld between the joints stuffing box and the traverse chamber. After numerous tests on concentricity of close tolerance machined guide surfaces they concluded that for joints up to 10” in size they could machine the guides surfaces concentric and hold the concentricity of these guide surfaces after welding the stuffing box to the traverse chamber.

    However, for sizes 12” and larger they found that the guide surfaces would distort from the heat of welding. Therefore, for joints of that size, machining the guide surfaces concentric needs to be done after the stuffing box to traverse chamber weld. This requires additional labor hours adding to costs.

    Consulting engineers agree that the expansion joints’ internal and external guides must be concentric and they agree that the heat of welding may destroy any previously machined concentricity. That’s why when you need the most reliable joint possible, beware of low priced expansion joints. They may cost much more in the end.

    Contact Campbell-Sevey to learn more about how we can assist you with your expansion joint needs.



     

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