MIL-PRF-16552F
(Application for copies should be addressed to the American Society of
Heating, Refrigerating and Air Conditioning Engineers, Inc., Publication
Sales, 1791 Tullie Circle, NE, Atlanta, GA 30329)
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)
2.4 Order of precedence. In the event of a conflict between the text of
this specification and the references cited herein, the text of this
specification takes precedence. Nothing in this specification, 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 used for the filter shall be corrosion-
resisting or material shall be protected against corrosion after fabrication.
Material degraded during the fabrication process shall be normalized to
restore those properties before assembled in any filter. Selected materials
shall be capable of meeting all of the operational and environmental
requirements specified herein.
3.2.1 Composite material.
3.2.1.1 Filter components. Composite material to be used for filter
shall be subject to small scale material specimen fire tests.
3.2.2 Hazardous materials. Material for use in the construction of
filters 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.
3.2.3 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.
3.2.4 Nonmagnetic construction. When
nonmagnetic filters are specified
(see 6.2) all filter parts including frame,
filter media, fasteners, and
fittings shall be of nonmagnetic material.
Nonmagnetic material is defined as
a material which has a maximum permeability
of less than 2 after fabrication.
3.2.5 Dissimilar metals.
Filters shall not be degraded due to
electrolysis (see 6.8).
3.2.6 Recovered materials. Unless otherwise specified herein, all
equipment, material, and articles incorporated in the products covered by this
specification shall be new and may be fabricated using recycled, recovered or
environmentally preferable materials. Recycled, recovered, or environmentally
preferable materials should be used to the maximum extent possible provided
that the material meets or exceeds the operational and maintenance
requirements, and promotes economically advantageous life cycle costs. None
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