PRESSURE GAUGES.--When performing
same equipment. Hydrostatic testing of systems or
components is commonly referred to as "H" pressure
tests. These tests of piping systems should be at a
These two gauges will indicate actual hydrostatic test
pressure of 135 percent above the maximum system
pressure. One of the gauges will be the master gauge
design pressure, but in no case less than 50 psi. The line
and the other will be the backup gauge. Use the master
drawing in figure 11-22 shows a simple hydrostatic test
hydrostatic test gauge readings as the true hydrostatic
setup and associated equipment.
test pressure throughout the test.
Master Gauge. --Master test gauges are used to
Hydrostatic Testing Equipment
indicate actual hydrostatic test pressures. The scale
range of the master test gauge should be greater than the
Shop hydrostatic testing of piping systems or
maximum test pressure, but should not exceed 200
components should be conducted in an area that can be
percent of the maximum test pressure. Master test
secured from all traffic. This area should also provide
gauges shall have a valid calibration label according to
the operator protection in event of component failure.
NAVSEA OD 54845, Metrology Requirements List.
When hydrostatic testing the ship's piping system, set
Backup Gauge. --A backup gauge is used to check
up the equipment in an area that can be secured from all
and verify the accuracy of the master test gauge. Like
unwanted traffic. The equipment required for
the master gauge, the backup gauge is also subject to
hydrostatic testing includes a pump, two pressure
actual test pressure. The scale range of the backup test
gauges, two relief valves, a cutoff valve, blank flanges,
gauge should also be greater than the maximum test
gaskets, and clamps.
pressure, but should not exceed 200 percent of the
PUMPS.--There is no specific requirements for
maximum test pressure. Backup test gauges shall also
the type of pump to be used for hydrostatic testing. The
pump must be large enough to deliver the required
54845, Metrology Requirements List.
pressure and water volume to the system being tested.
RELIEF VALVES. --Relief valves provide for
Pneumatic pumps are the most common type of pump
overpressure protection of the system or component,
used for hydrostatic testing and are operated by the
equipment, and safety of personnel. The relieving
ship's compressed air system. These pumps are usually
rated in gallons per minute.
capacity, at test pressure of relief valves used for
Figure 11-22.--Hydrostatic test equipment and set up.