UFC 4-390-01
23 July 2003
type and location of all gages.
Strain gages should be placed at
points of:
a)
General stress level
b)
Fatigue
c)
Low quality analysis
d)
Uncertain dimensions
e)
Geometrical discontinuities
f)
High stress between openings
The test procedure should duplicate the loading conditions
expected in service and, where applicable, should be such that
the mode of failure is identifiable. Upon completion of testing,
the recorded strain gage data should be used to verify the
calculated performance of the structure. The complete test
report should be provided to the SCA for review and approval.
B.4
DESIGN OF PRESSURE VESSELS TO COMMERCIAL CODES
Pressure vessels, within the scope of certification, should be
designed and fabricated in accordance with the ASME Boiler and
Pressure Vessel (BPV) Code, Section VIII, an equivalent published
design code, a standard approved by the SCA, or the design should
meet the applicable criteria of Sections B.2 and B.3 herein.
When designing to ASME BPV Code, Section VIII or other commercial
codes, the allowable stress values given in that specific code
are to be used. These allowable stress values reflect a factor
of safety empirically determined for the material and application
for each specific code.
B.4.1 Documentation Requirements for Pressure Vessels Built to
Commercial Codes. When using commercial codes in designing and
fabricating pressure vessels, the SCA requires documentation, as
outlined in the following subsections, in addition to that which
is specified in the commercial code.
B.4.1.1 Vessel Drawings. Drawings must completely identify the
vessel and all the appurtenances (foundations, penetrations,
attachments, etc). All welds should be detailed and fully
located. All components should be fully specified on the Bill of
Material and notes should fully explain or define processes,
specifications, procedures and/or special instructions. Vessel
weight, internal (floodable) volume and cycle life (when
required) should be stated on the Top Assembly Drawing for each
vessel.
B.4.1.2 Design Calculations. Design calculations should be
provided showing worst-case dimensions and tolerances, and
clearly stating all design assumptions and load conditions. The
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