Safety alert 12/2009 - Bulk dry powder discharge tanker

• The pressure vessel and its repairs were not inspected by a competent person.
• The air supply was not correctly regulated.
• The shell of the tank could not withstand the pressure imposed by the compressed air. 

• Follow the designer’s and/or manufacturer’s instructions for safe tanker operation.
• Supplied air pressure must be displayed by a calibrated pressure gauge, should and not exceed the designer’s and/or manufacturer’s instructions.
• Provide safety devices of the correct size to relieve excess pressure, without accumulation and set at or below the design pressure of the pressure vessel. 
• Pressure vessels must be inspected periodically, in accordance with AS/NZS 3788 Pressure equipment In-service Inspection.
• Pressure vessel repairs and/or alterations must be inspected by a competent person. 
• Dry bulk powder discharge tankers are a category of pressure equipment which requires a current registration with WorkSafe or another regulatory authority responsible for plant safety.

• AS/NZS 3788 Pressure Equipment In-service Inspection
• AS 4458 Pressure Equipment - Manufacture

Further information can be obtained from WorkSafe’s website or by contacting customer service on 1300 307 877 or email safety@demirs.wa.gov.au