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Page Title:
Cleaning test, ceramic ring/graphite |
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|  MIL-C-24196A(SH)
(c)
The cleaning solution in the ultrasonic cleaner under evaluation
shall have a concentration recommended by the contractor and
approved by the Government agency concerned and shall be
heated to a temperature between 140 and 160F. The solution
shall be deaerated for 30 minutes before cleaning the filters,
by energizing the sonic generator on the unit under evaluation.
Three preloaded filters shall be cleaned one at a time in the
(d)
cleaner under evaluation as specified in 4.6.4(a). The filters
shall be cleaned for a duration of time not greater than 15 minutes.
The three filters shall be cleaned one after another using the
same solution. Solution shall be circulated following the
cleaning operation of each filter.
(e)
The filters shall be tested as specified in Field Service Report
No. 10C, except cleaned dirt capacity for each filter shall be
at least 70 percent of actual dirt capacity.
(f)
The ultrasonic cleaner contractor shall conduct the above filter
cleaning test in the presence of and to the satisfaction of the
Government agency concerned.
4.6.5 Cleaning test, ceramic ring/graphite. Immediately following the
hydraulic filter test (see 4.6.4), a cleaning performance test shall be performed.
A detergent solution from the hydraulic filter test shall be used or a new
solution shall be prepared to demonstrate the cleaning ability of the unit by
cleaning six graphite coated ceramic rings as follows:
Six each aluminum oxide, unglazed, porous surface rings 1-5/8
(a)
(id) by l/8-inch thickness shall be used. One flat surface of
each ring shall be contaminated by rubbing 2-gauge graphite lead
against the ring's surface. The contaminated rings shall stand
at room temperature for not less than 1 hour and not more than
4 hours before testing.
(b)
Cleaning solution temperature shall be maintained at 150
(c)
The solution shall be allowed to de-gas for 15 minutes.
(d)
The rings shall be placed in a wire basket, with the contaminated
side up and equally spaced.
(e)
The basket with rings shall be immersed into the cleaning tank
to a position 1 inch from the bottom. The sonics shall be
activated for 1 minute.
(f)
The basket with rings shall be removed from the tank, rinsed
in clean water and observed for the amount of carbon removed
by comparing the color of the previously contaminated surface
to the color of the clean surface. Black graphite on the
white ceramic surface shall cover less than 25 percent of the
surface of each of the rings.
4.6.6 Loaded cleaning test. A load test shall be performed as follows:
A dummy load of 1/2 to 1 inch stainless steel cubes shall be randomly (not
oriented) distributed directly on the bottom of the ultrasonic tank. The load
shall be at least 10 pounds of stainless steel per square foot of tank bottom.
The ceramic ring cleaning test specified in 4.6.5 shall be repeated above the
dummy load. At least 50 percent of the ring surface shall be free of the black
graphite.
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