MIL-PRF-22594C(SH)
AMERICAN WELDING SOCIETY (AWS)
AWS B2.1/B2.1M
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Specification for Welding Procedure and Performance Qualifications
AWS B2.2/B2.2M
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Standard for Brazing Procedure and Performance Qualification
(Copies of these documents are available from the American Welding Society, 550 N.W. LeJeune Road, Miami, FL
33216 or online at www.aws.org.)
ASTM INTERNATIONAL
ASTM F1166
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Standard Practice for Human Engineering Design for Marine Systems, Equipment,
and Facilities
(Copies of this document are available from ASTM International, 100 Barr Harbor Drive, P.O. Box C700, West
Conshohocken, PA 19428-2959 or online at www.astm.org.)
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. When specified (see 6.2), a sample shall be subjected to first article inspection in accordance
with 4.2.
3.2 Materials. Materials shall be corrosion-resisting. Materials degraded during the fabrication process shall
be normalized to restore those properties before assembly in any heater. 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 heaters 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. Self-tapping 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. Heaters and components shall not be degraded by electrolysis as specified in
MIL-STD-889.
3.2.4 Nonmagnetic material. When nonmagnetic heater assemblies are specified (see 6.2), parts shall be
fabricated of nonmagnetic material which has a relative permeability of less than 2.0 after fabrication.
3.2.5 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.
3.3 Painting. Interior and exterior surfaces of the heater, except the heating elements and those surfaces
constructed of brass, copper, or corrosion-resisting steel, shall be painted as specified (see 6.2). If not specified, the
heater shall be unpainted.
3.4 Welding and allied processes. Welding and allied processes shall be performed by personnel certified to
AWS B2.1/B2.1M and AWS B2.2/B2.2M. S9074-AR-GIB-010/278 shall be used for guidance.
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