LPG Cylinder Re-Validation process generally consists of following steps. Some detailed procedures may be added in some countries that require further validation.
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1. Off Loading Cylinders
Unload all LPG Cylinders that require re-validation after visual inspection process
100
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2. Valve Unmounting
100Valves are removed with Valve Screwing/Unscrewing Machine to ensure valves are not damaged
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3. De-Canting
100Transfer all LPG Cylinder gas content to other LPG container to begin re-validation process with empty cylinder
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If Guard Ring and Foot Ring is Damaged
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4.1. Guard Ring and Foot Ring Repair
100Grinding of the Guard Ring and Bottom Ring for making these parts ready to welding in the next steps -
4.2. Foot Ring and Guard Ring Production
100Extremely damaged Foot Ring and Guard Ring of the cylinders are re-produced in order to get high success on re-validation process
- Assemble new produced Guard Ring and Foot Ring with the existing Cylinder Body Grinding of welded parts (Body-to-Guard Ring and Body-to-Bottom Ring)
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5. Heat Treatment
100Heat treatment of the existing cylinder body to clean the outer surface to make it ready to paint
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6. Hydro Static Testing of LPG Cylinder
100Hydro static testing of LPG Cylinder to check pressure resistance under extreme conditions compared to the usual pressure of the cylinder
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7. Stamping
100Stamping of the test date to the proper place on LPG Cylinder. It depends on the adopted regulation of the manufacturer company
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8. Shot Blasting
100LPG Cylinder is shot blasted with a proper sized blasting material. Shot blasting cleans the surface for the painting operation
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9. Preparation for Painting
100Cleaning off the dust from the LPG Cylinder surface for better paint adhesion
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10. Painting
100Painting the LPG Cylinder with a new coat with manufacturer’s RAL coded color
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11. Drying
100Drying the LPG Cylinder paint
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12. Pneumatic Testing
100Pressurized air is applied into the LPG Cylinder to check any leakage from the valve
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13. Purging the Air
100Inside of the cylinder must be eliminated of air. It should have some free expansion area for enabling gas inside of the cylinder
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14. Quality Control Inspection
100General overall quality of the LPG Cylinders are inspected