UFC 4-390-01
23 July 2003
B.5.3 Toxicity. As a precaution, the designer should consider
the toxic effects of materials. Materials, such as paints,
insulations, sealants, adhesives, plastics, fabrics, fittings,
and other items and equipment containing material or components
which may give off noxious fumes at any temperature below 200
degrees Fahrenheit or which could cause occupational illness,
should not be installed or applied within the unmanned pressure
test facility. For paints, sealants or adhesives, this
requirement applies after drying or curing. The SCA may require
Material Safety Data Sheets (MSDSs) for materials used inside
pressure vessels and on other surfaces in contact with
pressurization media.
Mercury, asbestos, cadmium, magnesium and beryllium are examples
of materials that should not be used in an unmanned pressure test
facility without adequate protection and justification.
B.5.4 Flammability. Every effort should be made to eliminate,
or at least minimize, flammable material in the unmanned pressure
test facility. It should be understood that materials that are
nonflammable at atmospheric pressures might be highly flammable
when subjected to increased oxygen concentrations and/or elevated
pressure.
If aluminum paint is used inside an unmanned pressure test
facility, precautions should be taken to ensure that it is not
applied over rusted steel. A primer, not containing red lead or
iron oxide, should be used under the aluminum paint.
Magnesium and alloys containing significant amounts of magnesium
should not be used in the unmanned pressure test facility because
of their high combustibility.
The applicant should provide sufficient information to permit an
independent evaluation of the suitability and adequacy of the
materials used.
B.6
DESIGN OF PENETRATIONS INTO AND THROUGH THE PRESSURE VESSEL
The applicant for the unmanned pressure test facility is
responsible for the safe and adequate design of all openings or
penetrations in the pressure envelope. When using the ASME
pressure vessel code as a guide, the designer must carefully
consider additional loads such as piping loads and make provision
for them.
All possible modes of failure, including leakage, must be
considered during the design phase of the system. Sufficient
testing must be performed and documented to confirm the
structural integrity and leak tightness of each penetration.
All vents, drains, exhausts, or other exits from the pressure
envelope, should be equipped with a means of positively securing
or locking against accidental opening or closing.
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