MIL-DTL-17813H
l.
ASTM B443
-
Nickel-Columbium-Molybdenum Alloy.
m.
ASTM B575
-
Low-Carbon Nickel-Chromium-Molybdenum, Low-Carbon
Nickel-Chromium-Molybdenum-Copper, Low-Carbon Nickel-
Chromium-Molybdenum-Tantalum, and Low-Carbon Nickel-
Chromium-Molybdenum-Tungsten Alloy
Material not definitely specified shall be of the quality used for the purpose in commercial practice
(see 6.2).
3.5 Performance.
3.5.1 Movement. The expansion joint shall be capable of absorbing the normal operating movement,
such as axial, lateral, angular, or a combination of these movements as specified (see 6.2 and 6.3).
3.5.1.1 Additional movement. When specified (see 6.2), the expansion joint shall be physically
capable of absorbing an additional movement in an amount up to the rated movement of the joint (see
6.3). This movement can be installation tolerances or upset conditions; the nature of this movement must
be specified (see 6.2).
3.5.1.2 Cyclic endurance (see 4.8.2). The capacity of the expansion joint to withstand the number of
cycles specified shall be determined in accordance with the EJMA Standards, a history of successful
operation of similar bellows, or by a qualification test, and shall be specified (see 6.2). The manufacturer
shall certify compliance with these requirements.
3.5.2 Deflection force (see 4.8.4). The force required to deflect the expansion joint shall be equal to
or less than the force specified (see 6.2). The connecting piping shall be properly guided and anchored in
accordance with the EJMA Standards.
3.5.3 Expansion joint stability. The expansion joint shall be designed as to preclude instability when
the joint is tested in accordance EJMA Standards. Instability shall be as specified in the EJMA
Standards.
3.5.4 Hydrostatic. When tested as specified in 4.8.1, the expansion joint shall be free of leaks,
resistant to plastic deformation, and found to be stable as specified in EJMA Standards.
3.6 Construction. The expansion joints covered by this specification shall be designed and
constructed in accordance with the generally accepted engineering principles set in ASME B31.1, or
section VIII, division 1, of the ASME Boiler and Pressure Vessel Code, and/or the EJMA Standards.
3.6.1 End connections. The connecting ends of the joints shall be provided with pipe flanges or
welded nipples as specified (see 6.2). Flange dimensions shall conform to the diameter and drilling of
ASME B16.5. The size, material, and pressure class shall be as specified (see 6.2). Facing shall be as
specified. Unless otherwise specified (see 6.2), the manufacturer may furnish "Van Stone" facings, made
by turning or flaring the ends of the bellows over the flange face. The outside diameter of the Van Stone
facing is to be the same as an equivalent lap stub end, or the raised face of the mating flange if different.
The face of the Van Stone, however is not a machine finish and it may not comply in every respect with
the ASME B16.5 dimensions for a raised face. A lap joint stub end may be provided when necessary.
Welding nipples shall be of a size, material, and nominal wall thickness designation specified, and shall
be beveled for welding.
3.6.2 Limit stops. When required for proper operation (see 6.2), limit stops shall be provided and
arranged to limit the movement of the joint to that for which it is designed.
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