MIL-PRF-2939G
(see 6.2), parts shall be fabricated of nonmagnetic material which has a
permeability of less than 2.0 (Air = 1.0) after fabrication.
Recovered materials. Unless otherwise specified herein, all
3.2.5
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 of
the above shall be interpreted to mean that the use of used or rebuilt
products is allowed under this specification unless otherwise expressly
stipulated.
3.3 Painting. Equipment and component items shall be delivered with the
manufacturer's standard finish, except as to comply with the requirements of
3.2.
3.4 Welding and allied processes. Surfaces of parts to be welded or brazed
shall be free from rust, scale, paint, grease, and other foreign matter.
Welding and allied processes shall be performed by personnel certified to
American Welding Society standards. NAVSEA Technical Publication S9074-AR-
GIB-010/278 may be used for guidance.
3.5 Identification. Each type of cooling coil shall be provided with a
permanently attached corrosion-resistant identification plate. Attachment
method shall be corrosion-resistant. The plate shall contain the following
information.
a.
Nomenclature (U.S. Navy Standard Cooling Unit).
b.
Size (see 3.13.2).
c.
Part or identifying number (see 3.5.1).
d.
Manufacturer's part number, name, and address.
3.5.1
Part or identifying number (PIN). Cooling coils should be
identified by a code number arranged sequentially by specification number,
class, size, and composition as defined in 1.2 and the following example:
-
1
68
N
M
2939
Composition
Size
Class
Specification Number
Inch - Pound identifier
3.6 Interchangeability. In no case shall parts be physically interchangeable
or reversible unless such parts are also interchangeable or reversible with
regard to function, performance, and strength.
3.7
Operating life. The equipment shall have an operating life of 40 years.
5
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