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|  MIL-D-18641F(SH)
requirements specified herein, unless disapproved by the Government. The Government reserves
the tight to perform any of the inspections set forth in this specification where such inspections
are deemed necessary to ensure supplies and services conform to prescribed requirements.
4.1.1 Responsibility for compliance. All items shall meet all requirements of sections 3 and
5. The inspection set forth in this specification shall become a part of the contractor's overall
inspection system or quality program (see 6.2). The absence of any inspection requirements in the
specification shall not relieve the contractor of the responsibility of ensuring that all products or
supplies submitted to the Government for acceptance comply with all requirements of the contract.
Sampling inspection, as part of the manufacturing operations, is an acceptable practice to ascertain
conformance to requirements, however, this does not authorize submission of known defective
material, either indicated or actual, nor does it commit the Government to accept defective
material.
4.1.2 Critical materials. For parts of distilling units subjected to submergence pressure, the
following items are designated as critical materials. Each of these items shall have material
traceability including heat lots, chemical and physical test reports. Critical materials shall consist of
the following:
a. Tube sheets
b. Seawater vent and drain connections including double tube sheet void space vents and
drains
c. Heat transfer tubing
d. Water boxes, including all parts (except gaskets), subparts and access covers
e. Nuts, studs, and bolts joining seawater containing parts
f. Permanent tube plugs including blind nipples.
Traceability records shall be retained by the contractor for 7 years from delivery. At the expiration
of the retention period, all records shall be made available to NAVSEA or its authorized
representative by written notification If no disposition is authorized within 6 months, the records
may be destroyed
4.2 Qualification tests. Qualification tests shall be conducted at a facility satisfactory to
NAVSEA These tests shall consist of the tests specified in 4.21 and 433. The tests shall be based
only on the use of natural seawater. These tests shall be run continuously shutdowns for weekends
.
during the duration of the test will be permitted.
4.2.1 Operation. The unit shall be mounted on a stable foundation and operated under the
conditions specified in 3.121 or 3.124 for a sufficient time, to be determined by NAVSEA to
allow evaluation of the suitability of design and materials, and to determine conformance to 3.13,
and the distillate purity requirements of 3.13.1. Normal scale preventive treatment (see 3.13) may
be used during this test.
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