Appendix I
Crack Testing
Crack testing is an optional test in which the Sprint LC is used to detect a
slight opening or change in pressure. Crack testing is used in devices such
as valves intended to open a certain pressure range. Because a crack is
desired, a pass indication is given if the crack happens within established
tolerances.
Crack testing is related to burst testing. A burst test is used with products
that open quickly to atmosphere and create a dip in pressure called an
event. In some products the event is too small or the pressure does not
drop at all. A crack test uses a second sensor downstream from the part to
catch a pressure rise or flow coming out of the part.
Crack Test Pass
FIGURE 100
TestCouple
Pressure
Sensor 1
Zero
(upstream)
Sensor 2
(downstream)
E
Zero
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