WORKCOVER NSW has issued a reminder to operators who work with gas supply lines and gas installations to use adequate safety precautions.
According to WorkCover NSW, the warning follows the injury of two apprentice plumbers in March 2009 after a large gas explosion.
Acting Workcover Chief Executive Officer Rob Thomson says it is important employers and workers are aware of associated risks involved in gas installations.
Mr Thomson claims purging of a gas installation should be completed and verified before maintenance or repair work is commenced on the system.
Purging avoids the possibility of an explosive air and gas mixture forming in piping, appliances or confined spaces.
WorkCover NSW says workers should ensure the purge outlet is at least six metres away from ignition sources and building openings.
WorkCover NSW is continuing to investigate the incident, where it appears flammable gases from the supply line ignited when released in a plant room which contained multiple ignition sources.