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|  MIL-C-24196A(SH)
3.4.2 Transducers. The transducers shall be zero spaced, nickel
laminate, magnetostrictive stacks, geometrically arranged on the tank bottom to
ensure uniform energy distribution in the cleaning tank. The transducers'
stacks shall be silverbrazed to a 316L stainless steel tank bottom. The
transducer coils shall be made field replaceable.
3.4.3 Cleaning tank. The cleaning tank shall hold objects being cleaned
in the system. Unless otherwise specified (see 6.2.1), the tank shall be of
the minimum working dimensions for the size specified in table II. The tank
shall be made from 316L stainless steel. The inside of the tank shall have a
no. 63 finish. The tank shall be arranged so that long objects may be cleaned
by being immersed one half at a time. The tank shall have the necessary
fittings for attaching to the recirculation system. The tank shall be fitted
with a drain connection and a drain valve. The tank shall be marked showing
the proper fluid level in order to avoid spillage when inclined, as specified
in 3.2.2.
3.4.4 Rinsing tank. A rinsing tank shall be provided for rinsing objects
after cleaning. The tank shall be made of 316L stainless steel. Unless other-
wise specified (see 6.2.1), the tank shall have the minimum working dimensions
specified in table II for the size specified. The inside of the tank shall have
a no. 63 finish. The rinsing tank shall be arranged so that long objects may be
rinsed by being immersed one half at a time. The tank shall be fitted with a
drain connection and drain valve. The tank shall have provisions for handling
the overflow during rinsing and the overflow shall be brought out separately
from the drain system.
3.4.5 Recirculating system. When specified (see 6.2.1), a recirculation
system shall be provided to pump, filter, and heat the solution in the ultra-
sonic cleaning tank. The system shall consist of a pump, filter, heater and
connecting piping. The system shall have a minimum flow rate of 50 percent of
the tank volume per minute. Means shall be provided to shut off the heater and
pump when the system filter is clogged.
3.4.5.1 Pump. A stainless steel pump suitable for use with all commonly
used aqueous cleaning solutions shall be provided. The pump shall be directly
driven by an electric motor rated for continuous duty without exceeding the
contractor's allowable temperature rise. The motor shall be protected from
damage by fluids. The motor shall operate properly after being subjected to
the shock and vibration tests (see 4.6.14 and 4.6.15).
3.4.5.2 Filter. A filter or filters (throw away element) and strainer
or strainers shall be provided to maintain a useful cleaning solution life span.
The strainer/filter capacity and retention capability shall be governed by the
intended use of the ultrasonic cleaning system and shall be as specified (see 6.2.1).
The filter shall be fitted with a device to indicate the need for filter cartridge
replacement and to remove power to the heater and recirculating pump when the filter
is clogged (see 3.4.7). The filter cartridge shall be readily accessible for
replacement without emptying the cleaning tank.
3.4.5.3 Heater. An electric heater for heating the cleaning solution in
accordance with type III of MIL-H-22577 shall be provided in the recirculating
system. The heater tank and heater element sheaths shall be of nonmagnetic
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