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Acceptability criteria for shock tested equipment cont'd |
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|  NIL-G-24477(SHIPS)
APPENDIX
Damage that renders inoperative any item or device installed to protect the
(b)
equipment or operating personnel, such as speed limiting governors, overspeed
trips, low rpm shutdown devices and high temperature low lube oil pressure
alarms.
Shock-induced actuation of safety devices specified in 30.4.1, item (b).
(c)
(d)
Damage or shock-induces misadjustment of speed governing systems that results
in inability to maintain speed automatically within the limits imposed by
the individual equipment specifications until repairs or adjustments are
made.
Loosening or shifting of any item affixed to a rotating part.
(e)
Damage that causes any assembly or subassembly to come adrift from any of its
(f)
intended restraints.
Damage that requires repairs of any type to be made before equipment operating
(g)
parameters can be adjusted to suit operational requirements.
Damage that creates a safety hazard to personnel or equipment.
(h)
(i)
Complete fracture of any unit or welded assembly.
Complete stripping or complete failure by gross distortion of all engaged
(j)
threads (male or female) of any threaded part.
Increase of dynamic unbalance of any rotating part or assembly to such an
(k)
extent that the vendor must re-balance the affected item prior to delivery
of the equipment or prior to conducting field balancing operations.
30.4.2 Damage from shock tests as characterized or specified herein will be permitted
to the extent or under the conditions listed for each item.
30.4.2.1 Damage that shortens the useful life of wearing parts by initiating or
aggravating some long-term detrimental effect such as wear, fatigue, or erosion is permis-
sible if the useful life of wearing parts is, reduced by no more than 25 percent.-/
1
30.4.2.2 Damage resulting in minor leaks of fluids or gases is permissible insofar as
no portion of this appendix is violated by any consequences of the leakage.
30.4.2.3 Loosening of hold-down is permissible if no portion of this appendix is
violated as a consequence of such loosening.
30.4.2.4 Damage that brings about a requirement to adjust control apparatus or equip-
ment setpoints in order to regain the pre-attach mode of operation, or damage that brings
about a requirement for timely repairs or compensatory action in order to prevent further
(and eventually unacceptable) damage that is related to increased wear rates or other long
term effects, is permissible only if the following conditions are met:
If NAVSEC agrees that the damage or its effects are of such a nature that
(a)
timely and proper damage diagnosis and compensation would certainly be made
by ship's force personnel familiary with the equipment.
(For purposes of
this appendix, it is considered that misalignment (if any) or shafting can-
not be corrected by ship's force.)
(b) If the equipment status before adjustment/repairs are made is such that no
portion of this appendix is violated by the immediate effects of the damage
or by requirements for repair of the damage.
30.4.2.5 Damage that results in continuous or intermittent rubbing contact between
stationary and moving parts (during equipment operation) in areas where it was not originally
intended that such contact be made is generally not permitted. NAVSEC may choose to permit
on a case basis, rubs which quickly wear away without causing adverse effects that otherwise
violate any portion of this appendix.
Due to difficulties associated with estimating reduction of useful life, equipment
acceptability shall be determined with consideration for the accuracy of the estimate.
In cases where it is especially difficult to estimate percent reduction of useful life,
equipment will not be rejected for this cause unless in the opinion of NAVSEC that the
limits specified herein have been grossly exceeded. In cases where the availability of
test or maintenance information permits a more accurate estimate of useful life reduction
to be made, appropriately less leniency will be allowed when determining acceptability
of the equipment of this basis.
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