MIL-PRF-2940D
The material used in the body of the snubber shall be included in the marking
(see 3.3.4) using the Unified Numbering System (UNS) designation in accordance
with SAE J 1086, and ASTM E 527.
3.2.1 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.
3.2.2 Nonmetallic materials. Nonmetals shall be moisture and flame
resistant, shall not support fungus, insect, or bacteria growth, and shall not
be adversely affected by the ambient environments specified in the
configuration and performance requirements of this specification. Nonmetals
shall not chemically react, degrade, or outgas when subjected to the
following: air, distilled water, seawater, salt, petroleum and silicone based
oils, oil solvents, prolonged (greater than one month) periods of exposure to
ambient temperatures, prolonged periods of exposure to elevated temperatures
(up to 350 degrees Fahrenheit (°F)), and exposure to prolonged cycling periods
from ambient to elevated temperatures. Any material which provides a nutrient
medium for fungus and insects shall not be used.
3.2. Porous metal. Snubbers with a porous metal composition (internal
parts and configuration) are prohibited for gas (type 3) and for seawater
(type 4) service (see 1.2.1). When used for oil or water (type 1 or 2)
service, snubbers with porous metal compositions shall only be employed in
systems with particulate contaminants less than 25 micrometers in size.
3.3 Configuration.
Snubbers shall contain no electrical or electronic
components.
3.3.1 Snubber body size. The length of the assembled snubber body
shall be not greater than 4 inches. The body shall have hexagonal cross-
sections of sufficient widths to allow the use of a wrench for installing and
removing. The distance across the flats shall be not less than 0.375 inch nor
greater than 1.25 inches. The maximum diameter of the snubber body shall be
not greater than 2.0 inches.
3.3.2
End connections.
3.3.2.1 General pressure gauge applications.
Snubbers used in pressure
gauge applications shall be as follows.
3.3.2.1.1 O-ring union connection. Snubbers used for O-ring union
pressure gauge application shall have 9/16-18 UNF-3A external threads on the
inlet connection and 9/16-18 UNF-3B internal threads on the outlet connection
in accordance with Drawing 803-1385850. When specified (see 6.2), each
snubber shall be furnished with a union nut, tailpiece, and O-ring.
3.3.2.1.2 Flareless (bite type) connection. Snubbers used for
flareless (bite type) pressure gauge applications shall have 7/16-20 UNF-2A
external threads on the inlet connection and 7/16-20 UNF-2B internal threads
on the outlet connection in accordance with MIL-F-18866, 6000 psi for 1/4-inch
tubing.
3.3.2.2 General pressure transducer applications. Snubbers used for
pressure transducer applications shall have a 7/16-20 UNF flareless tube
connection (1/4 inch outside diameter (od)) in accordance with MIL-F-18866 on
the inlet connection. The outlet connection shall be 7/16-20 UNF-2A external
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