MIL-STD-1622 Cleaning Of Shipboard Compressed Air SystemsThis standard provides the requirements for cleaning of compressed air systems and components.

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MIL-STD-1622B(SH)

(e)Test, charge with system fluid, and return to operational conditions.

5.7  System solvent cleaning processes.

5.7.1  Applicability.  The system solvent cleaning processes are given in Table VII.

TABLE VII.  Solvent cleaning processes.

1/   If moisture can be removed from the piping or item being

cleaned, it may be cleaned as specified in 5.6 instead of 5.7.3.

5.7.2  Nitrogen plants.

5.7.2.1  Material and equipment.

(a)A supply of cleaning solvent as specified in 4.2.5.

(b)The required equipment depends on the specific plant configuration

encountered which dictates what procedure will be employed to

clean the plant.  Specific procedures and equipment are not

specified in this standard.  The equipment shall be compatible

with the cleaning solvent.

5.7.2.2  Cleaning solvent.  The cleaning solvent for cleaning nitrogen plants shall be a NAVSEA approved halogenated solvent as specified in 4.2.5.

5.7.2.3  Cleaning method.  The cleaning method consists basically of dividing the plant's producer, storage, and pump-vaporizer process piping into a number of separate piping circuits by using the equipment's isolation valves and temporary jumper hoses and pipe closures.  Each piping circuit is leak- checked prior to filling with solvent.  Solvent is then circulated through

each piping circuit to be cleaned.  A fill-and-soak method may be used for large vessels such as distillation columns and storage tanks.  Consult NAVSEA, the vendor, or the ship's planning yard if necessary to identify previously used cleaning procedures or to develop a specific procedure for the make and model of the equipment to be cleaned.

5.7.2.4  Sample and removal of cleaning solvent from system.  The nitrogen plant shall be certified clean and free of cleaning solvent as specified in 5.7.3.4(b) and 5.7.3.4(c).

5.7.3  Cryogenic nitrogen or liquid air piping.

5.7.3.1  Material and equipment.  The following material and equipment are required.

(a)A supply of cleaning solvent as specified in 4.2.5. (b)A supply of nitrogen.

(c)A vacuum pump capable of pulling a minimum of 25 inches mercury (Hg) vacuum for removing the cleaning solvent.  The pump design shall preclude pump lubricant from being drawn into the system

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