OB 14 Blast Valve Lifting Rig
National Grid Electricity System Operator
National Grid TO Innovation Team
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Innovation Funding Incentive
Health and Safety
During an outage in November 2009 an Maintenance Delivery Electricity (MDE) operative sheared off
the end of his finger. This unfortunate incident occurred during the routine
maintenance of the OB14.
In order to carry out the maintenance of the circuit breaker the work involves the removal of
3 blast valves, 1 per phase, in order to refurbish the contacts and seals.
The CB has to be stripped of various components and a valve cover to expose
the blast valve. The blast valve is then extracted by using 2 jacking bolts which
lift the blast valve away from its housing). When you reach the limit of
the jacking bolts the valve is manually handled to remove the valve to a barrow
to be transported away to a workshop for repair. Once complete the process is
reversed and the blast valve replaced in the blast valve housing and the cover
The project will deliver a safe method of manual handling the 70kg blast valve
and the blast valve cover during its removal for maintenance purposes.
The key objective is to safe guard the current workforce, This will be delivered in
an effort to reduce the manual handling requirements for MDE Substation staff to
complete maintenance activities in a manner which will not place unnecessary
stresses on their bodies and thus reduce occupational health issues.