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Based on ASME Section VIII Division I, hydrostatic pressure is conducted on the pressure of just one.Half a dozen times design pressure.

In case a vessel is design for holding 1.0 kg/cm2.g pressure, the hydrostatic pressure test has to be done at 1.5 kg/cm2.g.

Hydrostatic test can also be placed on existing equipments and pipe lines to evaluate for leakage after being repaired or maintained. Hydrostatic job number increases during plant Turnaround period. Because then, the majority of equipments are opened for checking, inspection, clean-up, repairing, replacing certain parts or performing internal modification.

Using high pressure will be the main way to obtain hazards associated with hydrostatic pressure test. Hydrostatic test stores energy. Underhand could damage the facilities and endanger worker's safety. You need to have included this into the own hazard identification.

Safety Checklist:

In order to prevent accident from hydrostatic test operation, we must make good preparation before perform the test, in the pressurization process and depressurizing operation. These jobs should be produced in the form standard operating procedure. And here are the security checklists per stage.

Hydrostatic test preparation:

Specification sheet of the equipments and even pipe line, which mentions pressure and temperature designs can be obtained and finish.

reference: hydrostatic valve
 * Hydrostatic test pressure and temperature standard are actually clearly defined in the related document.
 * Supported documents for example P&ID and isometric drawing are available and adapt to as built facilities with the field.
 * Pressure test planning needs to be distributed to all relevant sections inside the plant site no less than a couple of days before the execution date.
 * Make good coordination among related sections which involve in the test.
 * All test equipments and tools should be inspected for wear and damage.
 * Pressure measurement tools are calibrated along with their statuses of calibration are nevertheless valid.
 * Pressure gauges utilized in test have adequate capacity. The gauges are recommended to possess 150% with the maximum allowable working pressure.
 * Pressure gauge is safety type, with blowout back.
 * Pressure gauges have to be installed at a proper location then it can be simply read, nor create additional hazards to the hydrostatic test or expose personnels on the vessel being tested.
 * All the temporary tools (including valve, fitting, hoses, flanges, blind plate, etc) should be rated over the absolute maximum hydrostatic pressure.
 * Isolate other equipments and pipe lines that won't use in the hydrostatic test.
 * Vents can be obtained and installed the high points to vent air. Confirm the vent line before testing and make certain it's not at all blocked.
 * Choose drain valve at the smallest time order to completely empty the vessel and pipe.
 * Safety relief valve is already installed. Safety relief valve setting is 1.More maximum allowable working pressure.
 * Safety relief valve is calibrated.
 * Isolate quality area and surround it with safety line. Put appropriate safety sign as well area.
 * Do not allow individual that does not have any relation while using hydrostatic test, to enter the exam area.
 * Whenever possible carry out the test from a remote area.
 * Be sure that all pipe and vessel supports have been in good and also have been inspected.
 * All hoses has to be tied down.
 * Water temperature should be greater than 16oC (60 F).
 * The hydrostatic-pressurizing pump is finished with safety relief valve.
 * Wear proper personal protective equipments.
 * Do not start the test if your concern is identified.
 * Issue a piece safety permit by authorized personnel.