MIL-PRF-2939G
AMERICAN WELDING SOCIETY (AWS)
B2.1-84
Welding Procedure & Performance Qualifications, Standard
B2.2-91
Procedure and Performance Qualifications & Performance
Quality, Standard Brazing
(Applications for copies should be addressed to the American Welding Society
(550 NW LeJeune Road, Miami, FL 33216.)
SHEET METAL AND AIR CONDITIONING CONTRACTORS' NATIONAL ASSOCIATION, INC.
(SMACNA)
Eads, William G., Testing, Balancing and Adjusting of Environmental
Systems, Sheet Metal and Air Conditioning Contractors' National
Association, Inc., Vienna, VA, 1981.
(Application for copies should be addressed to the Sheet Metal and Air
Conditioning Contractors' National Association, Inc., 8224 Old Courthouse
Road, Tysons Corner, Vienna, VA 22180.)
2.4 Order of precedence. In the event of a conflict between the text of this
document and the references cited herein, the text of this document takes
precedence. Nothing in this document, however, supersedes applicable laws and
regulations unless a specific exemption has been obtained.
3. REQUIREMENTS
3.1 First article. A sample shall be subjected to first article inspection
(see 6.3) in accordance with 4.2.
3.2 Materials. Materials shall be corrosion-resistant or material shall be
protected against corrosion after fabrication. Material degraded during the
fabrication process shall be normalized to restore any recoverable properties
before being assembled in any filter. Selected materials shall be capable of
meeting all of the operational and environmental requirements specified
herein.
3.2.1
Hazardous materials. Materials for use in the construction of
cooling coils shall have no effect on the health of personnel when the
materials are used for their intended purpose. Regardless of other
requirements, materials and parts containing asbestos, cadmium, lithium,
mercury, or radioactive material shall not be used.
3.2.2
Fasteners. Material for all bolts, nuts, studs, screws and similar
fasteners shall be corrosion-resistant, passivated, or of a material rendered
resistant to corrosion. Sheet metal screws shall not be used. Galling shall
be prevented. Tapped holes shall be reinforced where shearing of thread can
occur.
3.2.3
Dissimilar metals. Cooling coils shall not be degraded due to
electrolysis (see 6.6).
3.2.4
Nonmagnetic material. When nonmagnetic cooling coils are specified
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