The Health and Safety Executive (HSE) has warned Teekay following a “major” gas release on the Petrojarl Foinaven FPSO.

Teekay was issued with an improvement notice following the incident on August 24 last year at the BP-operated Foinaven field, west of Shetland.

HSE said the unintended release came after a failure of a small bore tubing assembly and that failure to carry out a suitable risk assessment was a contributing factor.

It said: “On the 24th August 2018 the failure of such actions were contributing factors that led to an unintended major release of hydrocarbon gas due to failure of a small bore tubing (SBT) assembly connected to a flange on the fuel gas compressor suction header.”

An HSE investigation found failures in the safety process for assumbling the tubing.

Teekay’s subsidiary, Golar-Nor UK, has until May 19 to comply with the notice.

Teekay has been contacted for comment.