Professional CNG Solutions
Our Expert Services
At MGR Hydrotest Inc, we follow a rigorous and PESO compliant hydrotesting process to ensure
every CNG cylinder is thoroughly inspected, tested, and certified for safe use. The procedure
includes the following steps:
Cylinder Removal
Cylinder is safely removed from the vehicle by trained technicians following all safety protocols to prevent damage or gas leaks.
Gas Venting
Residual gas is safely vented out in a controlled area to eliminate internal pressure and ensure operator safety.
Valve Removal
Cylinder valve is removed and threads are inspected to ensure they are not damaged or worn out.
De-oiling
All residual oil is removed from the inside of the cylinder to prevent contamination during testing.
Visual Examination
Detailed visual check for dents, corrosion, burns, or wear. Cylinders with critical damage are rejected.
Cleaning
Mechanical and chemical cleaning is done internally and externally to remove rust, oil, and contaminants.
Weight Check
Cylinder weight is compared to tare weight. Any major loss may indicate material degradation.
Borescope Inspection
A borescope visually inspects the internal surface for pitting, corrosion, or hidden flaws.
Ultrasonic Thickness
Measures cylinder wall thickness to verify structural integrity using ultrasonic testing tools.
Ultrasonic Flaw Detection
Internal flaws such as cracks or weld defects are identified using ultrasonic detection systems.
Hydrostatic Stretch Test
Cylinder is pressurized with water to test for expansion and structural strength. Rejected if limits are exceeded.
Draining & Drying
All water is drained and interior is dried with compressed heated air to prevent rust formation.
Valve Refitting & Leak Test
Valve is reinstalled and pneumatic testing is done to confirm leak-proof sealing.
Marking & Certification
Cylinder is stamped with test details and issued a hydrotesting certificate with all technical parameters.
Compliance Plate Fixing
A compliance plate is affixed to the cylinder, indicating serial number, test date, and next due date.