The Spring Rates given for Flexijoint bellows are the forces required to produce a unit movement of the joint. These movements can be axial (lbs/1/8"), lateral (lbs/ 1") or angular (inch-lbs/degree). These forces will be reduced by temperature and time. The higher the temperature the greater the reduction in force. Factors to compensate for this effect at various temperatures are given in the table above. Time will reduce the force by 50% over a 24 hour period.

To determine a spring rate for Flexijoint bellows at a known temperature, multiply the Spring Rate from the appropriate table by the Temperature Factor (Ft) given in the table above. This value is for instantaneous or rapid deflections.

Example Calculation: Axial spring rate for a 12 x 5 Conv. at 250°F.

F=100 X .39 = 39 (Lbs/ 1/8")
or
39 X 8 = 312 (Lbs / 1")