MIL-DTL-17813H
4.7 Examination. Each expansion joint shall be examined for compliance with the requirements
specified in section 3 of this document. Any redesign or modification of the contractor's standard product
to comply with specified requirements, or any necessary redesign or modification following failure to meet
specified requirements shall receive particular attention for adequacy and suitability. This element of
inspection shall encompass all visual examinations and dimensional measurements. Noncompliance with
any specified requirements or presence of one or more defects preventing or lessening maximum
efficiency shall constitute cause for rejection.
4.8 Tests. The following tests shall be performed. Failure of any expansion joint to pass any
specified test shall be cause for rejection.
4.8.1 Hydrostatic test. Each joint shall be subjected to a hydrostatic pressure equal to the maximum
4.8.1.1 First article hydrostatic test. The following details shall apply to first article hydrostatic tests:
a.
This test shall be performed first with the joint compressed to its qualifying rated
compression and then with the joint extended to its rated extension.
b.
When no extension is specified, this second test shall be made with the joint in its
neutral position.
c.
The hydrostatic pressure shall be 1-1/2 times the rated pressure unless otherwise
specified (see 6.4).
4.8.1.2 Standard production hydrostatic test. This test shall be performed with the assembly in the
neutral length. If the shipping length is different from the neutral length, and extends the convoluted
length of the bellows, the test shall be performed with the joint at its shipping length.
4.8.2 Cyclic endurance test (see 3.5.1.2). When specified (see 6.2), a cyclic endurance test shall be
performed on joints selected with the number of complete cycles as specified (see 6.2) and shall meet the
requirements of 3.5.1.2. The test shall be performed under pressure at ambient temperature and the joint
shall be cycled in axial movement only. During the test, the pressure in the joint shall be adjusted to
simulate, as closely as possible, the maximum design conditions of the joint to be qualified. Thus, the
maximum design pressure specified for the group shall be adjusted in accordance with ASME Boiler and
Pressure Vessel Code, based on the ratio of the stress values for the bellows material. The pressure
may vary from zero to this value during each cycle, providing the pressure reaches its maximum when the
joint is compressed to its qualifying rated compression. Upon completion of the required number of
cycles, each test joint shall be pressure-tested as before. If the joint fails to pass this cyclic endurance
test, it shall be rejected and a new joint of improved design shall be fabricated and tested. Any change in
the test joint must be reflected in the final production units.
4.8.3 Tests for pressure service. When the design pressure is equal to or larger than 15 psig the
joint shall be subjected to a hydrostatic test pressure equal to 1-1/2 times the design pressure. When the
design is less than 15 psig an air and soap leak test shall be performed in lieu of the hydrostatic pressure
test.
4.8.4 Other tests. Examinations may also consist of one or more of the following examinations
conforming to EJMA Standards:
a.
Radiographic
b.
Liquid penetrant
c.
Fluorescent penetrant
d.
Magnetic particle
e.
Ultrasonic
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