HYDRO STATIC PRESSURE TEST

 

PROCEDURE FOR HYDROSTATIC PRESSURE TEST

SCOPE:

This procedure establishes the steps to be followed fir conducting the Hydrostatic test in pressure vessel constructed in accordance with the rules of the ASME Boiler and pressure vessel code section VIII Div. 1.

PURPOSE:

Purpose of this procedure is to lay down the system for inspection during Hydrostatic pressure Test.

RESPONSIBILITY:

The Production shall be responsible for conducting Hydrostatic Test.

The Quality shall be responsible for approval of the test and get the same witnessed by the Customer/Client/TPI.

METHOD:

1.      Visual Examination, Dimension verification, NDE, PWHT (if applicable) shall be completed along with verification of internal QC records NCR’s as per approved drawing and QAP to ensure that the Equipment is ready for the Hydrostatic Testing.

                  

2.      Equipment shall also be cleared by QC for visual, dimensional, material, NDE and PWHT (if applicable) before Hydrostatic Testing Ensure no grinding & welding work balance on pressure part.

3.      Calibrated Dial indicating pressure gauges used in testing for Pressure Vessel and their parts as per ASME Section VIII Div. 1 shall be graduated over a range of about double the intended maximum test pressure, but in no case shall the range be less than 1 ½ nor more than 4 times that pressure.

                    

4.      All safety precaution to be taken before carrying out Hydro test.

                         

5.      Quality of Water to be use for hydro must be as per specification (PH value).

6.      The spacing between graduations shall be such that the inspector and the operator controlling the test shall be able to determine when the required test pressure has been applied.

7.      At least two pressure gauges one at the top of vessel and one at bottom of vessel shall be used during hydrostatic testing.

8.      The equipment shall be suitably placed & be stable for Hydrostatic Pressure Testing.

9.      The body metal temperature during Hydrostatic Test shall be maintained within the range minimum temperature 17°C & Maximum temperature 48 °C. The test pressure shall not be applied until the equipment and its contents are at about the same temperature. The calibrated temperature indicator shall be used for measurement.

10.  All the surrounding and the Equipment are to be kept clean and dry so that if any leak is there it can be easily detected

11.  Vents shall be provided at all high points of the Equipment in the position in which it is to be tested to purge possible air pockets while the Equipment is filling.

12.  Raise the pressure slowly to the Hydrostatic Test Pressure and hold it for at least 30 Minutes or more as mentioned in the Drawing / QAP.

13.  The close visual inspection shall be made at a pressure not less than the test pressure divided by 1.3 as per ASME Section VIII Div 1 and inspection shall be made of all joints and connections.

14.  Equipment shall be visually inspected for any leakage with adequate lighting and for pressure change if any on the pressure gauge.

15.  Observations shall be recorded.

16.  Once the hydraulic test is accepted, release the pressure gradually and drain the water.

ACCEPTANCE CRITERIA

           The equipment is accepted if there is no leakage, no pressure drop and no deformation is found.