TM 5-4220-226-14&P
NOTE
Scheduled coupling pull-out test is not normally required on
leader hoses. Perform test on leader hose only if test a.
reveals suspicious conditions.
Perform coupling pull-out test three years from manufacture
date and every two years thereafter and at any time the
hose is suspect.
Grip on the hose should be made approximately one foot
back from the fittings with a standard support grip.
(a) Install standard support grip one foot behind fitting.
(b) Fill hose with clean fresh water before installing test tee.
(c) Install hydrostatic pressure source.
(d) Install scale (0-300 LBS).
(e) Install chain hoist for an even pull.
(f) Subject hose to a pressure of 600 psig concurrent with axial tensile load of 250 LBS and hold for one
minute.
(g) Release pressure and tension from hose.
(h) Disconnect chain hoist, scale, hydrostatic pressure source, and test tee from hose.
(i) Drain water from hose.
(j) Discard hose and coupling that fail this test.
6-5
