Why to test LPG Cylinder? Gas cylinder testing is essential for tradespeople using gas powered equipment. It is also a requirement that cylinders used at the home are tested on a regular basis. All cylinders must be inspected and tested after manufacture. LPG cylinders need to be tested every ten years. Refill LPG Cylinders only when they have a current, legible test mark of a certified gas cylinder test station. LPG Gas cylinders should be be maintained in an upright position.