MIL-DTL-81716A
143 TO 157 PERCENT PEAK
THE SLOPE OF THIS CURVE GIVES
THE RATE OF PRESSURE RISE
RATED PRESSURE
(3000 PSI)
(20.68 MPa)
75 PSI (.52 MPa)
BACK PRESSURE
The curve shown above is the approximate pressure time cycle determined to be of proper
severity for impulse testing of hydraulic packings. Although it is mandatory only that pressure
peak rises to 143 to 157 percent of the rated pressure (3000 psi) (20.68MPa) at some point prior
to leveling off at rated pressure, it is considered highly desirable that the pressure time curve be
confined to the shaded area indicated. One very desirable benefit to be gained in this manner is
that results of tests performed on different test machines will be more nearly comparable.
Figure 6. Graph of pressure impulse cycle for impulse test.
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