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Scabbing Thickness.
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DOE Standard Accident Analysis For Aircraft Crash Into Hazardous Facilities
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Perforation Thickness. - Continued - std30140179


DOE-STD-3014-96
APPENDIX C
A few of the other formulas, such as the Modified Petry, Ammann and Whitney,
and Army Corps of Engineers formulas, suffer from limitations in the range of
available test data.
As discussed above, the Modified NDRC formula gives the penetration depth, x,
using Equation C 6-3 or C 6-4 as applicable. Once this is known, the scabbing
thickness, ts, of a barrier is given by:
ts
x
2.12
1.36
D
D
(C 6-5)
x
for 0.65 <
< 11.75
D
or
ts
2
x
x
7.91
5.06
D
D
D
(C 6-6)
x
for
< 0.65
D
To prevent scabbing, minimum concrete thickness, td, shall be > 1.1ts.
C.6.3.2.1.2
Perforation Thickness.
As discussed earlier in Section C.6.3.2.1.1, the Modified NDRC formula gives the
penetration depth, x, using Equation C 6-3 or C 6-4 as applicable. Once this is
known, the perforation thickness, tp, of a barrier is given by:
C-8


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