Figure 11-20.--Specify tests to be made all around.
Figure 11-17.--Location of specification, process,
classification, or reference.
Figure 11-18.--Specifying length and exact location of area to
Figure 11-21.--Combining nondestructive testing symbols
and welding symbols.
Figure 11-19.--Specify number of tests to be made at random.
The length of the section to be tested is specified as
shown in figure 11-18. To specify tests of welds or parts
Fluid systems are hydrostatically tested during
where only the length of the section need be considered,
initial construction, subsequent to repairs, and
the length in inches is shown to the right of the basic
periodically to verify the integrity of the system. All
piping sections that have been removed for repairs and
test symbol (fig. 11-18, view A). To show the exact
newly fabricated sections must be hydrostatically tested
location of the section to be tested as well as its length,
before installation to make sure that there will be no
dimension lines are used as shown in view B. When the
leaks under operating conditions. Operational tests are
full length of a part is to be tested, no length dimensions
also preformed, instead of hydrostatic tests, after certain
need be shown on the testing symbol.
repairs involving mechanical joints. The basic purpose
If a number of tests are specified to be taken at
of all such tests is to ascertain that the system can
random, the desired number of tests are placed in
perform its intended function safely and reliably. This
parentheses, as shown in figure 11-19.
section will discuss hydrostatic tests, operational tests,
and the equipment used to conduct these tests.
To specify tests that are to be made all around a part,
the test-all-around symbol is used with the basic test
symbol, as shown in figure 11-20.
Nondestructive testing symbols may be combined
Hydrostatic testing of piping systems is
with the standard welding symbols previously
accomplished whenever repairs are made to piping
discussed. This feature increases the scope of all
system or any related components. Hydrostatic testing
welding symbols. The length of a section to be tested
of ships' systems is required every 8 years, and should
can be indicated, and individual areas for testing can be
be conducted before or during the early stages of a
specified by means of these symbols. Figure 11-21
scheduled major overhaul of the ship. Regardless of the
shows the combining of nondestructive testing symbols
reason for testing, all hydrostatic testing is
accomplished in the same general manner using the
and welding symbols.