TEMPSC support structure – loss of integrity

Cause & Consequence

• Other

Incident Location

Fixed Installation

Incident Activity

Lifting, crane, rigging, deck operations

Specific Incident Equipment

Support structure for TEMPSC winch housing

Lessons Identified

Greater understanding required of `types’ of structure (I beams or box section) and potential internal corrosion issues (such as water ingress in box section beams) of these types of structure – Box section beam is seen to be unusual in the construction of installations

General visual inspection methods were utilised in these areas. The Risk Based Inspection (RBI) program is to be reviewed to ensure risks from potential internal corrosion are understood with a view to enhancing to close visual inspection and non-destructive testing (NDT) techniques

Ensure that any external survey report information is circulated to relevant colleagues and transferred to workpacks. In this instance, this could have been improved.

Incident Recommendations

Conduct investigatory surveys on other installations in the field to identify all locations where RHS beams are installed and determine their inspection technique and frequency in the RBI program, this may include NDT to determine wall thickness and potential internal corrosion

Ensure that specific survey information from commisioned reports and actions are registered and transferred to workpack scopes. Actions to be raised as work orders in MMS. Ensure that individuals associated with these actions are clear on their responsibilities in terms of information flow and capture.

When considering installing replacement or new equipment on to ageing installations, to extend service life of associated facilities, it is vital that the existing structure forming or providing a foundation for the new installation shall be throroughly inspected to confirm it is fit for purpose. This must be formally recorded in the Management of Change procedure.