Inspection Procedure (90-120-Day Inspection) (Cont)

TM 5-4220-201-12

WARNING

Do not submerge the mouth inflation valve

in water or allow water to enter the flotation

cell.

c. Keep the cells inflated for a minimum of 12 hours.

Record the room temperature and cell pressure at this time.

For each 1 degree rise in temperature, add 0.031 psi to the

final pressure reading.

For each 1 degree drop in

temperature, subtract 0.031 from the final pressure reading.

Cells having a corrected pressure of not less than 1.0 psi

are satisfactory for use. If cells show a marked decrease in

psi reinflate to 2 psi and check for leaks. If leaks cannot be

located, coat with a soap solution or submerge in a water

tank and observe clearly for bubbles.

d. Remove the cylinder and deflate the cells after they

have passed the inflation test. Check the cylinder valve for

proper operation and make sure gaskets (fig. 2-7) are

installed. Return the valve discharge lever (fig. 4-1) to the

closed position.

e. Check CO2 cylinder weight before reinstallation.

Scales calibrated in grams may be used for weight-checking

the cylinders. Remove from service and condemn cylinders

weighing less then the gross weight marked on the cylinder.

f. Upon completion of the periodic inspection and test,

mark the inspection date on each cell.

4-3