detergent per liter gallon of tap water for about 20 minutes.
Agitate and use brush as necessary.
b.
Rinse parts thoroughly in hot water at a minimum of 49 degrees C
120 degree F.
c.
Dry the parts in accordance with paragraph entitled "Drying
Requirements."
3.2.6.4
Ultrasonic Cleaning
Cleaning methods using ultrasonic equipment may be used.
3.2.7
Drying Requirements
Accomplish drying by still or forced clean air or inert gas, drying oven,
or by evacuation. When using evacuation, exercise care to prevent
evacuating-pump lubricant from entering the equipment. Check compressed
air used for drying to ensure cleanliness by blowing through a clean,
white, cotton filter cloth for about 5 minutes at full drying velocity.
3.2.8
Inspection and Acceptance Criteria for Cleanliness
Conform to ASTM A 380 and the following:
3.2.8.1
Cleanness Criteria
All surfaces of piping material, equipment, instruments, and other
components which will come in contact with compressed air shall be clean to
the extent that no contamination is visible to a person with normal visual
acuity (natural or corrected) under a lighting level of at least 1076 lux
100 footcandles on the surface being inspected. Cleanness of surface which
cannot be visually inspected due to inaccessibility or geometry shall be
determined by an interpretation of the discoloration or dirt obtained by
wiping with a clean, white, wet or dry cloth. Free of contamination shall
mean free of oil, dirt, metallic flakes, preservatives, paint, and any
other substances which may present a safety hazard or impair the quality of
the compressed air.
3.2.8.2
Critical Surfaces
No rust shall be allowed on valve seats, orifice plates or other critical
surfaces. Thin films of rust are acceptable on other corrosion-resistant
material surfaces provided there is no visible thickness or evidence of
pitting and the total area involved does not exceed one percent of the
total surface area of the component in contact with compressed air.
3.2.8.3
Carbon and Low Alloy Steels
A uniform light rust that can be removed by brushing or wiping is
acceptable.
3.2.9
Maintaining Cleanness During Installation
Maintain cleanness of piping, components, and equipment during
installation. Dirt and debris producing operations shall be performed so
that dirt and debris fall away from system openings; otherwise, provide
covers over openings to preclude contamination. Cap, plug, cover, or bag
openings and pipe ends and secure with tape when they are not required to
SECTION 15212N
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