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Failure of pipeline emergency shut-down valve

Health and Safety Executive - Safety Alert
Department Name: Hazardous Installations Directorate (Gas and Pipelines)
Bulletin No: HID 3-2010
Issue Date: 06 April 2010
Target Audience: Offshore Industry
Key Issues:

Failure of a safety critical element- spring return pipeline emergency shut down valve (ESDV)

Immediate inspection of actuator spring housings and retaining rods

Introduction:

This alert is issued following the failure of a spring return pipeline emergency shut down valve (ESDV). The failure left the primary platform isolation device inoperable with the valve failed in the open position. Other ESDVs have been examined and have found to be at risk of failing in this manner. Spring return valves other than ESDVs are equally vulnerable.

Background:

Investigation is ongoing but initial indications are that the actuator spring end plate retaining tie rods failed due to corrosion leading to the spring being released from the ESDV. This made the platform primary isolation device inoperable.

The end plate and springs were released at velocity due to stored energy presenting a hazard to personnel and topside process plant.

The open end design of tie rods made them susceptible to water ingress and corrosion from trapped moisture.

Action required by duty holders:

Immediate action- identify spring return valves and carry out risk assessment

Longer term duty holder actions

Relevant legal documents:

Pipeline Safety Regulations (1996), Health and Safety at Work Act etc. (1974) as amended

References:

Further information:

Further enquires should be made to HSE Gas and Pipelines team:

Scotland and Scottish Waters:

Health and Safety Executive
Hazardous Installations Directorate
Gas and Pipelines Unit
Lord Cullen House
Aberdeen
AB25 3UB

Rest of GB, territorial waters and UK continental shelf:

Health and Safety Executive
Hazardous Installations Directorate
Gas and Pipelines Unit
Lakeside 500
Old Chapel Way
Norwich
NR7 0WQ

General note:

This safety alert is targeted at pipeline operators but installation operators also have legal responsibilities to those who may be at risk from failure of spring return valves.

Regulation 8 of the Offshore Installations and Pipeline Works (Management and Administration) Regulations 1995 (MAR) requires co-operation between everyone who has a contribution to make towards ensuring health and safety on the offshore installation or in activities involving the installation. Regulation 8 aims to ensure that those who have duties under the Regulations (owners, operators, employers, installation managers etc) should not be prevented from complying with their legal duties by the actions or failures of others to act. It does not mean that duty holders can evade their responsibilities by seeking to pass their responsibilities to others. HSE therefore expects pipeline operators and installation operators to work together to address this matter.

Please pass this information to a colleague who may have this equipment or operate this type of system.

2015-06-17