FED-STD-791D
7.4 Change hardness of rubber cup.
H = H2 - H1
where:
H = change in durometer hardness.
H1 = original hardness value.
H2 = final hardness value.
7.5 Change in fluid pressure.
P = P2 - P1
where:
P = change in system pressure.
P1 = original pressure value.
P2 = final pressure value.
7.6 Change in fluid volume
V =V 2 -V 1
where:
V = change in fluid volume.
V1 = original volume.
V2 = final volume.
8. REPORTING
8.1 Summary. A summary of the test conditions and the inspection results shall be made
at the completion of the stroking test. Reports shall be made on the following:
a.
Degree (slight, moderate, or excessive) of corrosion, scoring, and galling of metal parts.
b.
Change in the initial diameter of the cylinders and pistons (see 7.1).
c.
Change in the base and lip diameters of the rubber cups (see 7.2).
d.
Percentage of lip diameter interference set (see 7.3).
e.
Change in the durometer hardness of rubber cups (see 7.4).
f.
Degree (slight, moderate, or excessive) of swelling, tackiness, scoring, scuffing, or
blistering of the rubber cups.
g. Pressure change in the system at end of each successive 12-hour interval (see 7.5).
h. Volume loss of fluid due to leakage or evaporation, at the end of each successive
24,000-stroke interval during the test (see 7.6).
i. Volume loss of the fluid at the end of the test (see 6.2.1 and 7.6).
58
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business