Limit rods are similar, however they accommodate a specified axial capability. Designs that have only two tie rods have the additional ability to accommodate angular rotation. Traceability of each bellow is maintained throughout the. Axial movement is prevented with the use of tie rods. Company uses EJMA based software along with our professional designers for bellow designing. Tie rods eliminate pressure thrust and the need for main anchors required in an unrestrained piping system.
Some insulating materials, if wet, can leach chlorides or other substances that could damage a bellows. Covers also provide a suitable base forĮxternal insulation to be added over an expansion joint. Covers prevent direct contact with the bellows, offering personnel protection, as well as protection to the bellows from physical damage such as falling objects, weld splatter or arc strikes. which require heavy gauge liners.Įxternal covers are mounted at one end of the expansion joint, providing a protective shield that spans the length of the bellows. Actual or factored flow velocities should always be included with design data, particularly flow that exceeds 100 ft./sec.
The actual flow velocity should be multiplied by 4 to determine if a liner is required per the above guidelines. Expansion joints that are installed within ten pipe diameters downstream of elbows, tees, valves or cyclonic devices should be considered to be subject to flow turbulence.
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