UFC 3-430-07
24 July 2003
including Change 1, Jan 2004 and Change 2, March 2005
CHAPTER 5
UNFIRED PRESSURE VESSEL INSPECTIONS
5-1
GUIDANCE. The activity operating and maintaining the pressure vessel
provides all material and labor necessary to prepare the unfired pressure vessel for
inspection in accordance with this UFC and the NBBI Code. The activity assists the
inspector as required during the inspections. Exception to this policy occurs when the
operation and maintenance of the pressure vessel is under the cognizance of a
contractor. In this case, the contractor provides material, labor, and assistance.
Inspections of pressure vessels located on Navy bases in foreign countries must comply
with this UFC under the constraints of the Status Force Agreement in effect. Inspectors
should not compromise safety issues, but should exercise restraint when interpreting
the fine points of the ASME Code. Obtain further guidance on foreign inspections from
the respective (East or West) NAVFAC Senior Boiler Inspector or the cognizant
geographic EFD of the NAVFACENGCOM serving the activity.
5-2
EXTERNAL INSPECTIONS OF UNFIRED PRESSURE VESSELS.
Perform external inspections of unfired pressure vessels in accordance with Part RB-
3200, Inspections of Pressure Vessels, of the National Board Inspection Code.
5-3
INTERNAL INSPECTIONS OF UNFIRED PRESSURE VESSELS.
Perform internal inspections of unfired pressure vessels in accordance with Part RB-
2030, Internal Inspections of Pressure Vessels, of the National Board Inspection Code.
Inspectors have the authority to order metal samples and/or ultrasonic tests for their
examination to ascertain the actual condition of the vessel.
5-4
MILITARY SPECIFICATION (MILSPEC) AND HYPERBARIC FACILITY
SUPPORT PRESSURE VESSELS
5-4.1
Internal and External Inspections. Examine vessels in accordance with
paragraphs 5-2 and 5-3. View internal surfaces using a borescope, if necessary,
supplied by the activity or by another acceptable method. Record areas of wear,
corrosion, abuse, and/or damage and attach to the inspection report.
5-4.2
Ultrasonic Examination. (Only for vessels constructed per military
specifications, the ultrasonic examination procedures in Naval Ship's Technical Manual
S9086-SY-STM-010, Chapter 551, 1.14.1.2 "Testing" may be used in lieu of the
following.) Subject vessels to an ultrasonic thickness measurement check. The activity
performs the checks while the inspector observes. Make the checks at the point of
tangency between the cylinder and the end heads. Take measurements at 50.8 mm (2-
inch) intervals around the circumference of the vessel. Take measurements on a line
along the head from the point of tangency, across the end of the head to the far point of
tangency; take measurements along a similar line at right angles to the first at the end
of the head. Take lines of measurement at each end of the vessel. Arrange the lines
so that the vessels low point, where water may collect and corrosion may form, is
measured. Take measurements every \ 3 /2/ years. Ultrasonic measurement points
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