How does the height of the base (F-type) spring have to be specified with downward movement?

Steps for height of the base (F-type) spring specified with downward movement:

Step 1: For example, using the PTP-1 100-F with downward movement of 1/4 inch, review the loaded length x minimum (9 1/16") and maximum (10 1/16") dimensions.

Step 2: Take the mid-point between those two dimensions which would be 9 9/16"

Step 3: Add the load flange thickness which is 1/2" which gives you 10 1/16"

Step 4: Add the amount of downward deflection (1/4 inch) for 10 5/16" as the installed height.

Variable Spring Supports for an Off-Shore Oil and Gas Refinery

F-Type Variable Spring Support

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How does the height of the base (F-type) spring have to be specified with downward movement?