Hangers are designed to support a given weight load through a specified travel with a minimum of load variation. Most often, the weight load is that of the pipe between an anchor and the hanger.
The travel is the displacement of the hanger node as it thermally expands away from the anchor. When weight sensitive anchors (such as equipment nozzles) are relatively close to the hangers (that is, less than four or five pipe diameters in the horizontal plane), the anchors should probably be freed during the hanger restrained weight run. When the anchors are freed, the weight of the pipe between the anchor and the hanger should fall almost in its entirety on the hanger.
Anchor nodes to be released are typed on the specific Hanger Auxiliary Data tab. The anchor degrees of freedom are released according to the specified Free Code value. Anchor degrees of freedom are released for the hanger design restrained weight run only. If the Free Code value is not specified for an anchor or restraint to be freed, all degrees of freedom associated with the anchor or restraint are released for the restrained weight solution.
Only linear restraints and anchors can be freed to cause additional weight to be carried by the hanger. See the following example for more information.
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The anchor at 5 is freed in the Y-direction; the anchor at 105 is freed in all directions. |
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