LPG Cylinder Re-Validation Process Flow

Re-Validation Process

LPG Cylinder Re-Validation process generally consists of following steps. Some detailed procedures may be added in some countries that require further validation.

  • 1. Off Loading Cylinders

    Unload all LPG Cylinders that require re-validation after visual inspection process

    100

  • 2. Valve Unmounting

    100

    Valves are removed with Valve Screwing/Unscrewing Machine to ensure valves are not damaged

  • 3. De-Canting

    100

    Transfer all LPG Cylinder gas content to other LPG container to begin re-validation process with empty cylinder

  • If Guard Ring and Foot Ring is Damaged

    100

  • 4.1. Guard Ring and Foot Ring Repair

    100

    Grinding 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

    100

    Extremely 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

    100

    Grinding of welded parts (Body-to-Guard Ring and Body-to-Bottom Ring)

    100

  • 5. Heat Treatment

    100

    Heat treatment of the existing cylinder body to clean the outer surface to make it ready to paint

  • 6. Hydro Static Testing of LPG Cylinder

    100

    Hydro static testing of LPG Cylinder to check pressure resistance under extreme conditions compared to the usual pressure of the cylinder

  • 7. Stamping

    100

    Stamping of the test date to the proper place on LPG Cylinder. It depends on the adopted regulation of the manufacturer company

  • 8. Shot Blasting

    100

    LPG Cylinder is shot blasted with a proper sized blasting material. Shot blasting cleans the surface for the painting operation

  • 9. Preparation for Painting

    100

    Cleaning off the dust from the LPG Cylinder surface for better paint adhesion

  • 10. Painting

    100

    Painting the LPG Cylinder with a new coat with manufacturer’s RAL coded color

  • 11. Drying

    100

    Drying the LPG Cylinder paint

  • 12. Pneumatic Testing

    100

    Pressurized air is applied into the LPG Cylinder to check any leakage from the valve

  • 13. Purging the Air

    100

    Inside of the cylinder must be eliminated of air. It should have some free expansion area for enabling gas inside of the cylinder

  • 14. Quality Control Inspection

    100

    General overall quality of the LPG Cylinders are inspected