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# Manufacturing & Maintenance of LPG Cylinders

At Proto Energy, we are the largest bulk, cylinder manufacturing and LPG re-filling company in Kenya initially founded to address the unmet demand for LPG in both the domestic and industrial sector. With the global push for industries to engage new avenues of energy optimization, we have since focused our expertise to provide industries with cleaner sources of energy and power while achieving higher efficiency. We deliver on quality, affordability, and reliability while adhering to the highest safety standards.

## Commitment to Safety & Quality

Over time, the physical condition of LPG cylinders can deteriorate with poor handling, use of inappropriate distribution equipment, and continued exposure to the elements.

Regular maintenance, repair, and requalification are necessary to ensure that they remain fit for service. Cylinders with defects and damage are segregated for appropriate action when brought into the filling plant.

Skipping maintenance increases safety risks. Cylinder maintenance and repair entail costs and should be done efficiently and properly.

## Cylinder Inspection Checklist

- Worn-out markings or faded paint/finish
- Leaking valves, missing rubber seals, or damaged valve parts
- Severe dents, bulges, gouges, and intersecting cuts
- Cracks, laminations, or weakened shell areas
- Fire damage, melted components, or heat distortion
- Corrosion (general, crevice, chain pitting, or isolated pits)
- Depressed valve boss or signs of arc/torch burns
- Pinhole weld leaks or deformation in collar/foot ring area
- Overdue for requalification or pressure testing

### Common Cylinder Defects

- Bulge: Visible swelling on the shell.
- Dent: A depression that exceeds 2% of the diameter.
- Gouge: Material removed or reshaped due to impact.
- Crack: Splitting or rifting of the shell.
- Corrosion: Pitting, scaling, or general surface reduction.
- Fire Damage: Charring, distortion, or melted components.

## Our Repair & Requalification Process

#### Minor Defect Repairs

Bent foot rings and collars are straightened using mandrills and hydraulic presses. This avoids costly welding and retains cylinder integrity.

#### Hot Work Repairs

For deeper damage, cylinders are gas-freed, cut with precision, and new parts welded on. Repaired units undergo heat treatment and hydro-testing.

#### Valve Handling

Damaged valves are removed, inspected, and replaced with ISO-compliant parts. Repaired valves are tested rigorously or scrapped if compromised.

## Requalification Standards

Our requalification process follows ISO 10464 and national regulations. Each cylinder is pressure tested, documented, and certified before returning to service.

Properly maintained cylinders can exceed expected service life, contributing to both safety and sustainability.