How long do LPG cylinders last? What determines cylinder service life

New dealers buying cylinders, filling plant owners and consumers have all asked: how long do LPG cylinders last? The short answer is that there is no fixed figure that applies to every cylinder. A cylinder stays in circulation while it continues to pass periodic inspections under current regulations, and is withdrawn when it no longer passes.

Periodic inspection determines service life

An LPG cylinder is pressure equipment and must be inspected before being put into use and re-inspected periodically under current regulations. At each inspection, an authorised body checks the condition of the cylinder, carries out a pressure test and checks the valve. Cylinders that pass have a new inspection date marked on the cylinder; cylinders that fail must be withdrawn.

A well-made, carefully maintained cylinder can pass many inspections; a poor-quality cylinder that has been knocked about or has rusted may be withdrawn early. For inspection dates and the accompanying documents, see LPG cylinder inspection records.

Factors that wear cylinders out quickly

• Rust: cylinders stood on damp floors, left out in the rain, or with scratched paint exposing the steel; deep rust on the base, the foot ring and around the welds is a common reason for withdrawal.
• Dents and deformation: dropped from vehicles, knocked during loading and unloading, stacked incorrectly.
• Exposure to fire or high heat: cylinders with scorched paint or caught in a fire must be reassessed by an inspection body.
• Poor storage and handling: laid down or kept near heat sources; throwing cylinders damages the foot ring, handle and valve.

How to recognise this damage is covered in can you use a rusty or dented gas cylinder.

Factors that help cylinders last

At the manufacturing stage

• The correct grade of steel, with thickness to the design — see LPG cylinder steel.
• Fully fused, even welds, inspected to the applicable standard — see LPG cylinder welding and weld inspection.
• Surface treatment and coating carried out to the correct procedure so the paint adheres firmly and resists rust — see LPG cylinder powder coating.
• VietnhatGas cylinders are manufactured to TCVN 6292:2013, with reference to ISO 22991, and delivered with inspection records for each batch.

At the use and storage stage

• Keep cylinders upright in a dry, well-ventilated place, raised off the floor — see storing LPG cylinders in a dealer’s warehouse.
• Load and unload gently; do not roll, drag or throw cylinders.
• Check the exterior each time a cylinder returns to the filling plant, and deal early with cylinders whose paint is peeling.

When a cylinder can no longer be used

Cylinders that fail inspection or have damage that cannot be remedied are withdrawn and may not be filled or circulated. Destroying cylinders, so that they can no longer be reused as gas containers, is carried out under current regulations. Do not sell withdrawn cylinders to establishments of unclear origin because of the risk of illegal reuse.

How should dealers plan cylinder replacement?

1. Manage by serial number: record the year of manufacture, inspection date and condition of each cylinder — see LPG cylinder management for dealers.
2. Track the withdrawal rate to forecast how many cylinders need to be added.
3. Replace gradually by batch, avoiding concentrating costs at one time.
4. Order ahead of the peak season to have enough cylinders in rotation — see ordering LPG cylinders in batches.

Whether a cylinder stays in service or is withdrawn is decided through its inspections; our article on what periodic cylinder inspection involves explains who carries it out, the technical basis and the usual inspection steps.

Frequently asked questions

Written by the VietnhatGas technical and sales team — a batch manufacturer of LPG cylinders. This content is for reference; regulations and standards may change, so please check the current texts.