| The flange clamping pressure
is derived from the clamping bolts and directly relates to the tightening
torque. Numerous variables in bolting efficiencies prevent charting
from being exact. The following chart assumes the bolts are not
dry, rough, or rusted and that high friction items are not used,
also that the flanges and bolt spacings are such that the pressure
is constant over the entire gasket area. The chart gives a range
of estimated pressure. The compression pressure will normally fall
in this range near the lower figure. The high figure should be considered
as the possible load applied to the bolt at this rate of torque.
The compression in pounds per bolt is multiplied by the number of
bolts to determine the total gasket load in pounds.
BOLT TORQUE LOADS
(CHART)
(click image to enlarge)
MARKINGS ON BOLT HEADS (CHART)
(click image to enlarge)
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