I have had to send the Banksmeadow site manager (Rick Bevan) to Perth (along with equipment) to address this issue as it has significant ramifications regarding not only this very large account, but also the whole process for the safe management of ISO tanks for the assistory supply in the region and also for the GBU. The maintenance regime for the tanks within the group has some questions to answer in relation to how these tanks were not picked up as being unfit for service or if there is reason to review the filling procedures so as to avoid risk of full ISO tanks being dispatched with this potential hazard.
For these tanks, the cause of the problem has now been identified as being related to the design of the manlid on certain tanks, which does not allow the manlid to effectively seat on its tank rim due to the position of the manlid hinge. This means that the tank will not hold a seal and air discharge is unable to be carried out. We have also had one instance where product has also leaked out. It is unknown if small amounts of product has not leaked on other tanks as the ambient temperatures in Perth have been ~40 degrees C and small amounts may have dissipated accordingly. Clearly this defect leaves these tank exposed to product leakage at any point along the logistics supply chain and thus significant potential for a major incident response from ports, shipping companies, trucking companies and end users.