MIL-DTL-17813H
3. REQUIREMENTS
3.1 Specification sheets. The individual item requirements shall be as specified herein and in
accordance with the applicable specification sheet. In the event of any conflict between the requirements
of this specification and the specification sheet, the latter shall govern.
3.2 Standard commercial product. The expansion joint shall, as a minimum, be in accordance with
the requirements of this specification and shall be the manufacturer's standard commercial product.
Additional or better features which are not specifically prohibited by this specification but which are a part
of the manufacturer's standard commercial product, shall be included in the expansion joint being
furnished. A standard commercial product is a product, which has been sold or is being currently offered
for sale on the commercial market through advertisements, manufacturer's catalogs, or brochures, and
represents the latest production model.
3.3 First article. When specified (see 6.2), a sample shall be subjected to first article inspection in
accordance with 4.5.
3.3.1 Determination of movement. In determining the qualifying rated contraction or extension,
consideration shall be given to the equivalent axial movement due to lateral deflection and angular
rotation. Equivalent axial movement shall be added to the actual specified values of axial movement and
shall be computed in accordance with the EJMA Standards.
3.3.2 Universal, swing, and pressure-balanced expansion joints. Universal, swing, and pressure-
balanced expansion joints consist of two or more bellows connected by pipe sections or fittings. Since it
is not the intent of the specification to test these units as assemblies, only one prototype bellows is
required to approve any such combination of bellows.
3.4 Materials. Materials used shall be free from defects, which would adversely affect the
performance or maintainability of individual components, or of the overall assembly. Materials not
specified herein shall be of the same quality used for the intended purpose in commercial practice.
Unless otherwise specified herein, all equipment, material, and articles incorporated in the work covered
by this specification are to be new and fabricated using materials produced from recovered materials.
3.4.1 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.
3.4.2 Pipe and bellows materials. Material for the bellows shall be one or more of the
following:
a.
ASTM A240/A240M
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Types 304, 304L, 310, 316, 316L, 321, 347, or 348.
b.
ASTM B36/B36M
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70/30 Brass (UNS C26000).
c.
ASTM B103/B103M
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Grade A Phosphor Bronze (UNS C51100).
d.
ASTM B127
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Class A Nickel Copper Alloy.
e.
ASTM B152/B152M
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UNS C11000, C11300, C11400, C11600, C12000,
C12200, C12300, C12500, or C14200..
f.
ASTM B162
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Nickel
g.
ASTM B168
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Nickel-Chromium-Iron Alloy.
h.
ASTM B194
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Beryllium Copper.
i.
ASTM B265
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Titanium and Titanium Alloy
j.
ASTM B409
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Nickel-Iron-Chromium Alloy.
k.
ASTM B424
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Nickel-Iron-Chromium-Molybdenum-Copper Alloy.
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