UFC 4-390-01
23 July 2003
pressure.
Fail Safe
Material or equipment designed
or arranged so that failure or
malfunction renders it harmless or
inert.
Fire resistant
A material that will
immediately self extinguish when the
source of ignition is removed, when
tested in an atmosphere representative
of its intended use environment.
Foundation
The permanently installed part
of a pressure vessel system which
serves exclusively to support the
Pressure vessel system.
Hard structure
Pressure resistant structures,
including reinforced openings and
penetrations, but other than the
pressure vessels, which may experience
high differential pressure and that
are designed to the same criteria as
the pressure vessel.
Heat resistant
A material that does not give
off noxious fumes at its operating
temperature or at any temperature
o
below 200 F and which is not degraded
in respect to performing its intended
function when exposed to a temperature
of 400oF for 5 minutes.
Implodable item
Any item containing a non-
compensated compressible volume that
has the potential for failure under
external pressure.
Material adequacy
Designed and constructed of proper
materials and (materially adequate)
performance tested in accordance with
accepted engineering principles to
provide for safety of the pressure
vessel system personnel.
Maximum operating
The highest pressure that can
pressure
exist in a system or subsystem during
any condition.
Maximum System Pressure
The maximum pressure that the
system can experience.
Milestone event
A list of sequential events in
the certification schedule process
with estimated completion dates.
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