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|  MIL-D-18641F(SH)
2.3 Order of precedence In the event of a conflict between the text of this document and
the references cited herein, the text of this document takes precedence. Nothing in this document,
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however, supersedes applicable laws and regulations unless a specific exemption `has been obtained.
3. REQUIREMENTS
3.1 Qualification. Water distillation units furnished under this specification shall be products
which are authorized by the qualifying activity for listing on the applicable qualified products list
at the time of award of contract (see 4.2 and 6.5).
3.2 Shock resistance. Shock tests of complete distillation units or separately mounted
components thereof weighing approximately 400,000 pounds (this weight includes the weight of the
unit or component, test fixture, ancillary equipment and fluids) or less are required (see 4.4 and
6.2).
33 Dynamic analysis. Distilling units which cannot be shock tested shall be dynamically
analyzed in accordance with NAVSEA 0908-LP-000-3010. The distilling units, sub-bases, feet,
structural members and hold down bolts shall be included in the analysis.
3 . 4 vibration
Distilling units shall be subject to the requirements of MIL-STD-167-1
(see 4.5).
3.5 Airborne and structureborne noise. Distilling units shall meet the requirements of -
MIL-STD-740-1 for airborne noise of grade B equipment and in accordance with MIL-STD-740-2
for structureborne noise (see 4.6).
3.6 Reliability. The mean-time-between-failures (MTBF) and mean-time-to-repair (MTTR)
shall be as specified (see 6.2 and 6.3).
3.7 Maintainability. The distilling unit shall be such that al! maintenance, both corrective and
preventive, can be accomplished at the organizational level with no outside assistance. Preventive
and corrective maintenance shall be demonstrated by successful completion of the maintainability
demonstration (see 6.3). Demonstration within the maintenance envelope dimensions is required.
3.8 Safety. Safety design features, including fail safe features, shall be incorporated into the
design to prevent damage to equipment and to ensure optimal personnel protection during
operation, repair or interchanging of any component or assembly.
3.8.1 One-button shutdow. Distilling units for submarines shall accommodate a one-button
shutdown of the unit which will safely secure all steam supply, seawater feed, and brine dilution,
trip all solenoid-operated dump valves, and secure all distilling plant pumps. The one-button
shutdown system will be provided by the shipbuilder.
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