Expansion joints are essential for allowing piping systems to accommodate thermal expansion, contraction, and movement. But before they ever go into service, there’s another component that plays a critical role — shipping bars. Proper handling during shipping, staging, and installation helps ensure these joints arrive intact and perform reliably. Triad Bellows uses best practice techniques to protect your investment from the moment we build it.
What Are Shipping Bars?
A shipping bar is a temporary support structure attached to expansion joints by the manufacturer. Its purpose is to maintain the shape, alignment, and structural integrity of the bellows during transit and prior to installation. Often painted a high‐visibility color (e.g., yellow), the bars make it obvious that the joint must stay rigid until it’s installed. Without the shipping bars, the bellows could get deformed, stressed, or damaged during handling.
When Should You Remove the Shipping Bar?
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Keep the shipping bars attached during transportation from manufacturer to site.
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Keep them in place even while attaching the expansion joint to the pipes; the joint should not be allowed to move or flex until all installation connections are secured.
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Only after the expansion joint is fully installed — all flanges or ends aligned and tightened — should the shipping bar be removed. Once removed, the joint can begin to move as designed.
What Not To Do With Shipping Bars
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Do not use shipping bars to suppress thrust during pressure tests. They are not engineered for test loading.
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Do not use them to lift the expansion joint or to bear handling loads beyond what the manufacturer specifies. Improper lifting can warp or damage the joint.
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Always follow the manufacturer’s instructions for moving, supporting, or manipulating the joint — misusing the bars can result in damage that undermines performance.
Triad Bellows’ Value‑Added Proposition for Shipping Bar Use
When you choose Triad Bellows, you benefit from more than just well‑made expansion joints — you get protection, reliability, and engineering integrity from day one:
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Quality Assurance from Fabrication to Delivery — We attach shipping bars as part of our finishing process to ensure the bellows hold their shape and alignment during shipping and handling.
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Clear Instructions & Best Practices — Triad provides installation guidance so your team knows when and how to remove shipping bars properly, process pressure tests, and handle joints safely.
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Materials & Build That Respect Shipping Needs — We design bellows, flanges, and joints with enough rigidity and dimensional stability so that shipping bars support them effectively without compromising performance once installed.
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Reduced Risk of Damage & Warranty Claims — By protecting bellows in transit and staging, we reduce the likelihood of deformation, misalignment, or handling damage that might otherwise result in early failure or additional repair/replacement costs.
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Support Throughout Lifecycle — From order and packing to installation and field use, Triad Bellows remains involved. If there are questions about shipping bar removal, lifting, handling, we are available to ensure best practices are followed.
Frequently Asked Questions (FAQs)
Q: What if the shipping bar is removed early — before installation is complete?
A: If the shipping bar is removed before the joint is fully secured to the pipe, the bellows can shift, deform, or become misaligned. That deformation may lead to leaks, reduced expansion capacity, or early failure. It’s best to keep the bar on until all connections are tight and the joint is ready to move in service.
Q: Can shipping bars be reused or repositioned if the joint must be moved after delivery but before installation?
A: No. Shipping bars are designed for specific attachment points and loads and are not meant for lifting or moving the joint once removed or relocated. If you must move the joint prior to installation, consult the manufacturer for proper handling instructions. Triad provides guidance to avoid misuse.
Q: Are shipping bars designed to withstand pressure testing?
A: No. They are not meant to suppress thrust during pressure tests. Using them in this way can lead to damage because they’re not engineered for those loads. Use proper anchors, restraints, or test fixtures specified by the manufacturer.
Q: What happens if shipping bars are painted or marked? How will field crews recognize that they are temporary?
A: As standard practice, shipping bars are often painted bright colors (e.g., yellow) to alert installers they are temporary. Triad Bellows ensures clear marking and documentation so there’s no confusion in the field. If you receive a joint and there is uncertainty, contact us for verification.
Why Shipping Bars Matter
Because expansion joints are designed to flex, move, and absorb stress during operation, any damage or misalignment before service can severely reduce their life, impair performance, or lead to failures. Correct use and timing of shipping bars protect critical dimensions, maintain joint integrity, and ensure that the installed joint performs as expected under load, pressure, movement, and thermal cycles.
Contact Triad Bellows
Shipping bars may seem like a small accessory in the grand scheme of piping systems, but they serve a critical role in protecting expansion joints from the moment they leave the factory. At Triad Bellows, we treat handling and shipping with as much care as design and fabrication — because we know your system’s performance begins long before first startup.
Need guidance on how to handle, install, or maintain expansion joints (including shipping bar removal)? Contact Triad Bellows’ engineering team. We can walk you through your specific project and ensure your joints are delivered, installed, and operate optimally.