The 8-inch nominal bore, hydraulically operated MLA involved in the incident had been in service for 11 years and had been regularly maintained by various recognised industry contractors. It had a rigid link pantograph balancing system with independent primary and secondary counterweights linked to the inboard and outboard arms. The MLA failed as it was being manoeuvred towards a ship manifold for connection. A section of the MLA fell backwards onto a jetty handrail narrowly avoiding live plant and pipework on an upper-tier COMAH establishment.
Source: https://www.hse.gov.uk/safetybulletins/marine-loading-arm-failure.htm
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