MIL-DTL-82068D
d. While maintaining pressure at a minimum of 90 percent of operating pressure (see
3.6.1), and with the spray gun shut off, unwind the hose to maximum reach, open and close the
spray gun, and rewind the hose to determine leaks in hose or at connections, operation of hose
reel brake, tension control, operation of the retraction crank or handwheel, tendency toward hose
twist, and ease of handling. Make observations also for leaks at valves, packing about the pump,
strainer, and elsewhere in the piping system.
e. With the gun closed, observe indications on the pressure gage at not less than 5
different settings between 50 psi and the operating pressure (see 3.6.1), to determine steadiness
of pressure control. Readable variations in excess of 50 psi that are not due to changes in
settings shall be cause for rejection of the pressure-regulating valve assembly.
f. Attach the spray gun over the tank opening in a position suitable for continuous
discharge into the tank and, using an intermediate capacity flow control disk, operate the sprayer
at the operating pressure (see 3.6.1), for the remaining time in the test.
g. On completion of 100 hours of operation with pesticide, the tank bottom, the suction
strainer basket, and all accessible surfaces which were continually exposed for 100 hours to the
pesticide solution, shall be examined for signs of flaking, peeling, blistering, or dissolution of the
tank coating. Detection of any such signs shall be cause for rejection of the sample.
h. The sprayer shall be completely drained, after inspection for leaks, and shall be
examined for signs of stoppage, sediment accumulation, traps, and air lock conditions. Pump
cylinders, piston cups, and o-rings shall be disassembled and examined for breakage, tolerance of
fit, and wear.
4.5.4 Refiller assembly test. The flow rate capability of the refiller assembly (see 3.7.9),
shall be determined by timing the change of level of water in a source container calibrated in
gallons. The replenishment source shall be at least 10 feet below the pump inlet. Set the
pressure control for the operating pressure level and determine the rate of delivery of water into
the sprayer tank using the refiller hose.
4.5.5 Spray boom test. When a spray boom is provided, the boom shall be operated at a
pressure of 50 psi to determine uniformity of distribution (see 3.7.10) and the capability of the
spray boom wings to return to operating position without damage after deflection. The shape of
the spray shall be visually determined. The flow rate through each nozzle shall be determined by
timing the flow into a calibrated container.
4.5.6 Sprayer hose test. Hose shall be tested in accordance with the standard methods of
ASTM D380 and ASTM D622, or shall be certified by the hose manufacturer that the hose meets
the requirements of 3.7.8.1. Hose tested and accepted during fabrication need not be retested.
4.5.7 Electromagnetic radiation test. When electromagnetic radiation suppression is
testing to determine compliance with SAE J551-1, the manufacturer may furnish a certification
that the sprayer meets the requirements, together with a list of the suppression devices installed.
The suppression device list shall be sufficiently detailed to allow visual determination that the
specified devices are installed.
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