Near-miss: Broken chain on self-propelled hyperbaric lifeboat (SPHL) recovery rigging
- Safety Flash
- Published on 9 June 2017
- Generated on 25 January 2026
- IMCA SF 14/17
- 2 minute read
A self-propelled hyperbaric lifeboat (SPHL) was being lifted to the main deck for an hyperbaric reception facility (HRF) mating trial.
What happened?
During this activity, the aft lifting chain on the SPHL broke whilst transferring the weight of the SPHL from the davits to the crane.
The SPHL was approximately 50 mm clear of the cradle when the aft chain snapped. At the time of the incident the crane reported an 8-tonne load. The dry weight of the SPHL was 13 tonnes.
No persons were in the SPHL or in the immediate vicinity at the time of the incident. There were no injuries.
What went wrong? - Investigation and findings
- The rigging had been sent ashore for annual testing and failed on-board the vessel, shortly after it had been inspected by a 3rd party.
- The rigging was not tested as per 3rd party inspection procedures.
- The rigging was being stored outside in open environment – this will have contributed to the condition of the chain.
- A canvas sock around the rigging made it more difficult to inspect and see corrosion.
- A chain link failed at 2 positions and appears to not be deformed – indicating existing crack propagation.
What were the causes of the incident?
- Storage of the recovery rigging on top of SPHL exposed chain to the external environment – this contributed to the chain becoming corroded.
- The Inspector:
- Checked lower links of the chain only and did not inspect the section hidden by the protective cover.
- Assumed that he had inspected sufficient percentage of the chain from which to infer the condition of the entire length; the chain under protective cover had significant corrosion.
- Checked lower links of the chain only and did not inspect the section hidden by the protective cover.
What lessons were learned? And what were the actions?
- All chain slings older than 12 months to be destroyed.
- SPHL recovery rigging to be stored below decks and fitted only when SPHL is required.
- Audit to be conducted of 3rd party to ensure compliance with inspection procedures. Improved liaison and communication with 3rd party auditor.
Related safety flashes
-
IMCA SF 21/16
10 August 2016
-
IMCA SF 11/15
10 August 2015
IMCA Safety Flashes summarise key safety matters and incidents, allowing lessons to be more easily learnt for the benefit of the entire offshore industry.
The effectiveness of the IMCA Safety Flash system depends on the industry sharing information and so avoiding repeat incidents. Incidents are classified according to IOGP's Life Saving Rules.
All information is anonymised or sanitised, as appropriate, and warnings for graphic content included where possible.
IMCA makes every effort to ensure both the accuracy and reliability of the information shared, but is not be liable for any guidance and/or recommendation and/or statement herein contained.
The information contained in this document does not fulfil or replace any individual's or Member's legal, regulatory or other duties or obligations in respect of their operations. Individuals and Members remain solely responsible for the safe, lawful and proper conduct of their operations.
Share your safety incidents with IMCA online. Sign-up to receive Safety Flashes straight to your email.