An air supply hose on an air-driven tugger winch snapped out under pressure, and IMCA analyzes the incident to provide lessons learned.
An air supply hose on an air-driven tugger winch snapped out under pressure from the cam lock adapter. A main deck air-driven tugger winch supplied through a 5cm air hose with a nominal pressure of 8 bar was connected by a cam lock coupling to the winch.
This arrangement had been in place for several months. Shortly after using the winch the supply hose ejected from the cam lock adapter.
- The wrong type of adapter had been installed on the air hose. Why this was, could not be determined;
- Investigators assumed that the final check to ensure that the work equipment could be operated safely had been not performed properly, since a pre-use visual check should have highlighted the issue;
- The “male thread” adapter was inserted inside the hose and had been tightened by a hose clamp using a “homemade” connection;
- Whip checks, also known as safety whiplash arresters, to prevent serious injury from hose or coupling failure were in place, but not installed correctly;
- A company internal safe use of work equipment assessment checklist had not been used and filled in as required;
- There was inadequate maintenance, control and supervision on materials and equipment used.
- The crew installed the correct type of coupling as an immediate corrective measure;
- Install “hose barb” type cam lock adapters according to the manufacturer hose couplings and accessories specifications;
- Always use whip checks at each hose connection and from equipment to hose to prevent serious injury from a hose or coupling failure;
- Ensure regular, adequately resourced, and planned maintenance of equipment;
- Re-emphasise the hazards of stored pressure.
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