MIL-DTL-17813H
common connector for the purpose of absorbing any combination of the three basic
movements, i.e., axial movement, lateral deflection, and angular rotation.
d. Swing expansion joint An expansion joint designed to absorb lateral deflection and
angular rotation in one plane only by the use of a pair of swing bars.
e. Pressure-balanced expansion joint An expansion joint designed to absorb axial
movement and lateral deflection while absorbing the pressure thrust by means of tie
devices interconnecting the flow bellows with an opposed bellows also subjected to line
pressure.
6.1.2 Pressure. Copper alloy expansion joints should be restricted to the pressure conditions
specified in 3.7.1. Corrugated, unreinforced expansion joints (except copper (see 3.7.1)) are commonly
limited to low-pressure services, with the upper limit being between 30 and 100 psig working pressure
depending on size and the specific design. Reinforced and fabricated expansion joints (except copper
(see 3.7.1)) are suitable for medium and higher pressures. All types are suitable for vacuum service.
6.1.3 Sizes. Expansion joints are custom engineered and fabricated for specified applications.
Because there are infinite number of sizes that might be required for use in piping systems which include
both standard and nonstandard sizes, specific sizes are not cited in the classification section 1.2.
6.2 Acquisition requirements. Acquisition documents should specify the following:
a.
Title, number, and date of this specification.
End connections (see 3.6.1).
b.
c.
If "Van Stone" facings are required and size of material and pressure class (see 3.6.1).
Whether limit stops are to be provided (see 3.6.2).
d.
e.
Guides, if required (see 3.6.4).
f.
Flow liners and material, if required (see 3.6.5).
Shrouds, if required (see 3.6.6).
g.
h.
When a cyclic endurance test is required for first article and production units and the
number of complete cycles required (see 4.8.2).
Other tests if required (see 4.8.4).
i.
Packaging (see 5.1).
j.
6.2.1 Data requirements. When this specification is used in an acquisition and data are required to
be delivered, the data requirements are developed as specified by an approved Data Item Description
(DD Form 1664) and delivered in accordance with the approved Contract Data Requirements List
(CDRL), incorporated into the contract. When provisions of DoD Federal Acquisition Regulations (FAR)
Supplement, Part 27, Sub-Part 27.475-1 (DD Form 1423) are invoked and the DD Form 1423 is not used,
the data should be delivered by the contractor in accordance with the contract or order requirements (see
4.8).
6.3 Performance. The following pertain to 3.5 and the following:
a. Bellows expansion joint design is dependent upon several variable conditions under which the
joint is intended to operate. It is therefore imperative that all applicable conditions under
which the joint is to operate be specified in the acquisition documents.
b. The type and degree of motion which the joint is required to absorb (see 3.5.1) is specified
separately from the requirement for extra traverse motion (see 3.5.1.1). It is suggested that
expansion joints are specified to be suitable for 25 percent more movement than the
calculated expansion of the piping. The type and amount of motion can be specified directly,
but a dimensioned and labeled sketch or drawing of the piping layout is generally preferred by
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