MIL-STD-1411B
cylinder on its side, and rotate it for approximately 15 minutes. The cylinder can be rotated either with a mechanical rotating machine or by rolling back and forth on the floor. It should be rocked from side to side periodically so as to contact all interior surfaces. Empty the cylinder and observe the discharge solvent. If the solvent is dirty, repeat the cleaning procedure using fresh solvent. Do not use the original solvent as it could redeposit contaminants. When a solvent reclaiming procedure is available, some solvents may be reclaimed by boiling and condensing the vapors. Otherwise, the solvent shall be discarded. After cleaning, the cylinder shall be dried and purged to remove all residual solvent. This is especially important for cylinders in oxygen service, as residual organic solvents pose a serious safety concern.
5.3.2.4.3 Vapor degreasing of cylinders. Solvent cleaning by vapor degreasing uses a tank with immersed heaters to vaporize the solvent. The solvent vapor is discharged through an injection tube over which a cylinder is placed. The hot vapors condense on the internal walls of the cylinder being cleaned, dissolve the oil contamination, and return to the tank by gravity. The solvent thus becomes contaminated with oil and the boiling temperature of the mixture of solvent and oil increases slightly. Even though the solvent becomes contaminated, the vapor driven off by heating is clean solvent. The cylinder is thus cleaned at all times with clean solvent.
5.3.2.4.3.1 Procedure for vapor degreasing.
dried.
a. The cylinder should be rinsed with water internally and externally and then thoroughly
b. Invert cylinder with an appropriate hanger and lower it over the injection tube of the vapor degreaser cleaner. The injection tube must almost reach the base of the cylinder. Various sizes of tubes should be available for use with each unit.
c. The cylinder should be left on the cleaner for 15 to 45 minutes after vapor starts to issue from the neck of the cylinder. The time required depends upon the type and quantity of the contamination.
d. Remove the cylinder from the vapor degreaser and immediately purge it with at least
100 cubic feet of oil-free compressed air or nitrogen. Exhaust the cylinder to the outside of the building.
e. Immediately dry the cylinder thoroughly to avoid the possibility of corrosion. Avoid hazardous concentrations of the degreasing vapor in the area.
5.3.2.4.4 Mechanical cylinder cleaning. When the internal surfaces of a cylinder have become oxidized or corroded to the extent that an internal inspection cannot be made, the oxidized material shall be removed by iron based abrasives, by shot blast, or by uses of a spinning mandrel and a steel chain.
5.3.2.4.4.1 Shot blast. A shot blast system utilizes high-pressure air to drive particles of iron or steel of a uniform size against the internal surface of the cylinder. The action will cut coatings, rust, scale, or corrosive build-up free from the reduced steel of the cylinder. A free
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