Quantcast Establish PDT contribution of exterior shell

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MIL-HDBK-1013/1A
Column C of the new construction worksheet (Table A-1) under the first layer
option (which may or may not be the building exterior depending on the
preliminary layout).  In the case of a retrofit design, the minimum
construction also applies to the first layer which may or may not be the
exterior of the building depending on the layout.  In some cases, a new
interior layer may be required (e.g., a vault).  In this case, the minimum
construction should be entered in the Retrofit Worksheet (Table A-2) under
"Existing" or Row C for each layer element (walls, doors, etc.).
<39> Establish penetration delay time (PDT) for each component.
The penetration delay time for each prescribed component construction should
be obtained from Paragraph 5.4 and entered appropriately into Column D of the
New Construction Worksheet (Table A-1) or Row D of the retrofit worksheet
(Table A-2).  The appropriate forced entry threat severity level identified
under the Design Threat Item 3 of the worksheet should be used.
<40> Is PDT plus ingress/egress greater than or equal to the guard
response overall components?  If one or more of the building component PDT
plus ingress/egress times (both interior and exterior to the building) does
not equal or exceed the guard response time, additional delay is required.
In this case, the flow chart branches to Element <41>, otherwise to Element
<55>.
<41> Is risk acceptable?  If the PDT plus ingress/egress times for
one or more of the building components does not equal or exceed the guard
response, the designer should decide if the risk is acceptable considering
other factors such as the cost of additional hardening, etc.
<42> Has the building exterior been designed for blast, standoff
weapons, or ballistics?  If the facility exterior has been previously
designed with specific construction identified under "Facility Exterior" in
the worksheet, the flow chart branches to Element <43> to establish the
forced entry penetration delay offered, otherwise to Element <46>.
<43> Establish PDT contribution of exterior shell.  The PDT data
for each component should be obtained from par. 5.5 for new construction, or
par. 5.6 for existing and retrofit construction, and entered appropriately
into Column D under "Facility Exterior" of the worksheet for new construction
(Table A-1) or Row D and F for existing and retrofit construction (Table
A-2).
<44> Is exterior layer PDT plus ingress/egress times greater than
or equal to the guard response over all components?  If one or more of the
exterior layer component PDT (Column D in Table A-1, Column G in Table A-2)
plus ingress/egress times (both interior and exterior to the building) does
not equal or exceed the guard response time, additional delay is required.
In this case, the flow chart branches to Element <45>, otherwise to
Element <55>.
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