243187646-Heat-Exchangers-Hydrostatic-Test-Procedure

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SAFCO-INSPECTION DEPARTMENT
Heat Exchangers Hydrostatic Test Procedure
Prepare the Exchangers for hydro test by providing necessary blinds and
venting arrangements.
If it is shell side pressure test, Open tube side channels for inspection of tube
sheet areas. Tubes and TTS welds shall be clean and dry.
Minimum 2 calibrated pressure gauges shall be used for testing. The dial of
the gauges shall be positioned in such a way that they are clearly visible to
the operator controlling the pressure during the test. One of the pressure
gauges shall be located in the highest point. Pressure gauges used for testing
shall have dial graduated over range of double the intended test pressure.
Minimum of one PSV shall be installed in the test loop to avoid accidental
over pressurizing. PSV set pressure shall be 105 % test pressure.
Fill-up shell side with DM water and ensure water fills up fully by opening the
vents.
The metal temperature of the pressure parts shall not be lower than 17°C &
not higher than 50°C during pressure test.
The test pressure shall not be applied until the vessel and the test fluid are at
about the same temperature.
Gradually increase the pressure. For high test pressures, increase the
pressure in steps and hold the pressure for duration of 5 Minutes at each
step at 50%, 60%, 70%, 80% and 90% of test pressures.
Pressurization rate shall not be more than 0.5 Kg/cm2 per minute.
Pressure shall be further increased until the hydrostatic test pressure is
reached.
Hold the test pressure until complete check of the Tube, Tube sheet, TTS
joints & shell pressure parts and at least for Minimum (1.0) one Hour.
After complete inspection of all equipments, gradually depressurize the
system from the highest vent point. Complete gradual depressurization of
the test pressure shall be done in 1.5 Hr.
Depressurization should not be more than 0.5 Kg/cm2 per minute.
After depressurization, completely drain the water. Dry and carry out purging
for thorough removal of water as per the requirement
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