UFC 3-430-07
24 July 2003
including Change 1, Jan 2004 and Change 2, March 2005
CHAPTER 6
PRESSURE TESTS
6-1
HYDROSTATIC TESTS. Make hydrostatic tests in accordance with the
paragraphs below and the National Board Inspection Code, Part RB-3140 Evidence of
6-1.1
Strength Test Pressure. Base strength tests on the maximum allowable
working pressure (MAWP) of the boiler or pressure vessel as marked or as recalculated
as a result of previous tests. All boilers and unfired pressure vessels covered by ASME
Section I or Section VIII, Division 1 subjected to internal pressure will be tested
hydrostatically at a pressure of 1-1/2 times the highest safety valve popping pressure or
1-1/2 times the MAWP, whichever is less. Unfired pressure vessels constructed by the
standards of ASME Section VIII, Division 2 subjected to internal pressure will be tested
hydrostatically at a pressure of 1-1/4 times the highest safety valve popping pressure or
1-1/4 times the MAWP, whichever is less. Exceptions follow:
Vessels not capable of supporting the weight of liquids (see Chapter 10,
MAWP and paragraph 6-2, Pneumatic Tests).
Vessels not readily dried that are to be used in services where traces of
the testing liquid cannot be tolerated (see Paragraph 6-2, Pneumatic
Tests).
The test pressure for enameled vessels will be at least equal to, but need
not exceed, the maximum allowable working pressure marked on the
vessel.
The test pressure for glass-lined vessels will not exceed the maximum
allowable working pressure.
The test pressure for cast iron vessels will be 2 times the maximum
allowable working pressure for maximum allowable working gage
pressures greater than 206.84 kPa (30 psig) and 2-1/2 times the
maximum allowable working pressure but not to exceed 413.69 kPa (gage
pressure) (60 psig) for maximum allowable working gage pressures under
206.84 kPa (30 psig.)
The test gage pressure for vessels and piping in high-pressure air
systems (20684.27 kPa (3,000 psig and over)) will not exceed 1-1/2 times
the maximum allowable working pressure of the system.
6-1.1.1
Vacuum Vessels. Single-wall vessels designed for a vacuum or partial
vacuum only, and chambers of multi-chamber vessels designed for vacuum or partial
vacuum only, need not be subjected to a hydrostatic test.
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