Section IV. DIRECT SUPPORT MAINTENANCE

TM 10-4200-200-13

Section IV. DIRECT SUPPORT MAINTENANCE

Rinse cans in clean boiling water, turn upside down,

3-8. Repair Parts, Special Tools and Equip-

ment

and allow to dry.

d. Rinsing and Drying. Each can will be ade-

a. Special Tools and Equipment. The 5-gallon

quately rinsed to remove cleaning solutions Clean

water can does not require special tools and

hot water, maintained at temperature of 150F., will

equipment.

be used for rinsing. After the can is rinsed, it will be

b. Repair Parts. Repair parts issued with or

siphoned free of excess water and heated for a period

authorized for the 5-gallon water can are listed in the

sufficient to vaporize all remaining moisture. The

Repair Parts List, Section VI.

can will be purged with air, preferably hot, to

eliminate all excess vapor. It must be above room

3-9. Refinishing

temperature and free of all moisture and residue at

a. Removing Dents. No attempt will be made to

the completion of drying. Completion of drying can be

remove dents from cans. Dents in cans are accepta-

determined by a simple test. Hold a cool glass over

ble providing the cans are not ruptured and the

the can opening, if condensation forms on the glass,

dents are not so severe as to impair stacking.

the can is not sufficiently dry.

b. Cleaning Exterior. Flanges and plugs, especially

e. Replacing Parts. Install new washer (1, fig. 3-1)

threads and gasket seats, must be thoroughly

and replace closure assembly (5), pin (3), and washer

cleaned. Clean flanges and plugs with a solvent,

(4) as described in paragraph 3-7.

P-D-680, and a brush to remove all corrosion and

f. Leak Testing. Before the cans are painted or

other foreign matter. All gaskets should be removed

treated with preservative oil, they will be tested for

before cans are cleaned. All loose paint, rust, grease,

leaks. Cans with leaks in the body of the can will be

and other foreign matter will be removed from the

scrapped. The presence of leaks can be determined

exterior of the can. This will be done by chemical or

by either of the following tests:

mechanical means.

(l) Water tank test. Cans are subjected to internal

(1) Chemical cleaning. When cans are cleaned

air pressure and completely submerged in clean

chemically, they will be cleaned with solutions that

water. Air bubbles emitted from cans indicate the

do not dissolve or attack steel. Rust maybe removed

presence and location of leaks.

with solutions containing diluted phosphoric acid.

(2) Air pressure test. Cans are subjected to

The conditions of use; time, temperature, and

internal air pressure of 7-to 9-psi for a period of 45

concentration; of phosphoric acid solutions will be

seconds. A drop in air pressure, as indicated on an

such as to minimize damage to the steel.

accurate pressure gage during the test period, shows

(2) Mechanical cleaning. Before a can is cleaned

the presence of leaks.

mechanically, it should be free of excessive grease

g. Repairing Leaky Cans. Cans with leaks in the

and oil. Mechanical cleaning methods may include

body will be scrapped. Closure assembly leaks will be

buffing or blasting. Buffing consists of cleaning by

repaired.

means of rotating brushes or rotating the can

h. Painting Exterior. After cans have been

against converging brushes. Blasting consists of

repaired, thoroughly cleaned, leak tested, dried, and

pressure spraying the can with sand or grit or similar

rust freed, exteriors will be painted with one coat of

material. The operator must determine the extent to

rust-inhibiting enamel. Before cans are painted,

which blasting is feasible without excessive metal

plugs must be inserted and hand tightened. Paint

removal.

will be applied uniformly by spray. Cans will be either

c. Cleaning Interior. Cans will be thoroughly

heated to a temperature of 250F and dried in a

cleaned by washing in hot water containing a

suitable drying oven immediately after painting, or

hand-dishwashing compound, P-D410. Repeat this

baked at 250F for 45 minutes or an equivalent

until all loose rust, scale, or other foreign matter is

tire-temperature cycle.

removed. If rust other than pin-point of line (weld)

rust remains after cleaning, the can will be salvaged.

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