NG TGN(E) 282
Technical Guidance Notes - Reyrolle Air Blast Circuit Breaker OIBR140 Silencer Dome Installation Procedure
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| Organization: | NG |
| Publication Date: | 1 April 2015 |
| Status: | active |
| Page Count: | 4 |
scope:
PURPOSE AND SCOPE
Following the recent failure of OIBR 140 ABCB at Bolney X110, it is considered the 5/8W x4" Cap Head screws used to secure the Silencer Domes are a driving factor in the failure. All cap head screws require to be replaced to remove the requirements detailed within OESB 15/2014.
The following procedure shall be followed to change and tighten the Silencer Dome cap head screws to a set torque.
Torque values as agreed with the manufacturer and endorsed by ERA Technologies LTD and National Grid Network Engineering.
Document History
NG TGN(E) 282
April 1, 2015
Technical Guidance Notes - Reyrolle Air Blast Circuit Breaker OIBR140 Silencer Dome Installation Procedure
PURPOSE AND SCOPE
Following the recent failure of OIBR 140 ABCB at Bolney X110, it is considered the 5/8W x4" Cap Head screws used to secure the Silencer Domes are a driving factor in the failure....