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Appendix Requirements for High Impact (HI) Shock Equipment |
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|  MIL-G-24477(SHIPS)
APPENDIX
APPENDIX
REQUIREMENTS FOR HIGH IMPACT (HI) SHOCK EQUIPMENT
10.
SCOPE
10.1 This appendix covers the design, test, and acceptance requirements for diesel
generator sets which must withstand HI shock.
20.
APPLICABLE
DOCUMENTS
20.1 The following documents, of the issue in effect on date of invitation for bids
or request for proposal, form a part of the appendix to the extent specified herein:
SPECIFICATIONS
MILITARY
MIL-S-901 - Shock Tests, HI (High Impact) Shipboard Machinery, Equipment
and Systems, Requirements for.
MIL-S-21952 - Steel (HY-80 and HY-100) Bars, Alloy, Hot Rolled.
MIL-S-22664 - Steel, Alloy, Extrusion, Structural Shapes (HY-90 and HY-100).
MIL-S-22958 - Steel, Alloy, Shapes, Hot Rolled Structural (HY-90 and HY-100).
MIL-S-23008 - Steel Castings, Alloy, High Yield Strength (HY-80 and HY-100).
MIL-S-23009 - Steel Forgings, Alloy, High Yield Strength (HY-80) and HY-100).
(Copies of specifications, standards, drawings, and publications required by suppliers
in connection with specific procurement functions should be obtained from the procuring
activity or as directed by the contracting officer. )
30.
REQUIREMENTS
30.1 The requirements of MIL-S-991 shall apply except as otherwise specified herein.
30.2 Diesel generator sets and all attached and detached accessories shall conform to
the requirements for type A, class I of MIL-S-901 and the shock test criteria specified in
30.4. Acceptance of generator set and accessory designs which have been subjected to shock
tests shall be based on the ability of the equipment to conform to acceptability criteria,
as revealed by its performance during and after shock tests and the results of post-test
examination and operating tests conducted at the supplier's plant. In the event that the
acceptance criteria are not met, acceptance will also depend upon the corrective action
proposed by the contractor. A detailed report of the inspection along with the contractor's
proposals for shock hardening (if necessary) shall be forwarded to NAVSEC. Review by NAVSEC
of the results of shock tests, the pre-shock and post shock test inspections, and the correc-
tive action shall be required.
30.3 Intended function. The intended function of shockproof generator sets is to
continuously deliver electrical power conforming to required performance characteristics
throughout and after being subjected to shock of the magnitude experienced during shock
tests as specified in MIL-S-901. Further, a shockproof generator set, when subjected to
shock, shall not suffer damage to the extent that it creates a possible hazardous situation
such as fire or injury to operating personnel, or such as to result in likely failure of
major units of the set if the set if not immediately shut down for corrective action. In
determining if equipment has passed shock tests, the criteria in 30.4 herein shall be used.
30.4 Acceptability criteria for shock tested equipment.
In determining if a shock
tested equipment has passed shock tests, the criteria specified hereinafter shall apply.
NAVSEC shall be the final judge of whether an equipment shall be accepted or rejected on the
basis of shock test requirements: however, the manufacturer shall have the option of conven-
ing a conference with NAVSEC to discuss questionable situations involving acceptance or re-
jection of shock-tested equipment.
30.4.1 Damage as characterized or as specified herein shall not be permitted as a result
of shock tests. In the following, as elsewhere in this section, shock tests are sometimes
equated to an attack upon a Navy ship.
(a) Damage which causes or necessitates reduction of equipment output to a level
below rated for any length of time within 30 days after attack.
35
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