Testing Process

Cylinder-Testing Process

 

Steps of testing the CNG  cylinder:

1-Making sure that the vehicle was converted by a certified authority, through reviewing the certificate of origin, the maintenance book, quittance, fueling card or a work order addressed to the cylinder-testing center from the certified authority.
                                                                                                             

2- Preparing the cylinder for testing.


3- Deflating the cylinder of gas.


4-Inspecting the external surface after cleaning it to make sure that there is no hole, rust, corrosion, inflation, charring or any other defects in the cylinder’s body. In case there is any of the subject defects, the validity of the cylinder shall be determined according to the cylinder’s specification of manufacturing or the following specifications:

The New Zealand Standard NZS 5454 – The Australian Standard AS 2030 1 -1999 – The Egyptian Standard – The ISO Standard 11439 - The ISO  Standard 19078.


5-The cylinder’s weight: In case the cylinder’s weight is less than 95% of the weight printed on the cylinder, the cylinder shall be rejected.


6-Inspecting the screw: the internal screw and the valve screw of the cylinder are to be inspected to ensure that they  safe and void of any distortions.


7-Testing the cylinders manufactured as per the ISO Standard / FDIS 11439 is undertaken through a hydrostatic test. As for testing the cylinders manufactured as per the New Zealand Standard and the Australian Standard AS 2030 1 -1999, it is undertaken through a hydraulic pressure test. As for the cylinders manufactured as per the ASMI Standard, it is undertaken through an ultrasonic device and the cylinder’s thickness shall be compared to that stated in its utilization manual.


8-Drying the cylinder: through lifting the cylinder from the pressure device and putting it on the drying device and installing the relevant connections of the drying device, then, pressing the START key so that the drying circle starts which takes 6 minutes.


9-Painting: through removing the corrosion from the cylinder, as in case there is corrosion, the old painting shall be removed from the corroded part utilizing a paint remover; the cylinder’s body shall be completely repainted with white color.


10-Typing the date of testing: the date of testing is to be typed on the cylinder through markers dedicated for such purpose.


11-Assembling the cylinder in the vehicle: the cylinder valve is installed utilizing the torque wrench allocated for that and installing the cylinder in the vehicle; then, the cylinder shall be fueled with gas upon finalizing connecting it to the vehicle. Afterwards, the valve is to be checked using water and soap to observe any leak. Eventually, a certificate of the test will be issued.

In case the cylinder is not valid, it shall be junked through making a hole in its body at 5 cm * 5cm and cutting its top, so that it will not be valid for utilization again – in accordance with the applied standards; an authenticated certificate of this action shall be issued and a copy of which shall be kept to be delivered to the customer.


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