GB Project (WP and CPP) location is in an open sea with relatively high lightning activity. When completed this project shall bring gas to Singapore through a 300km subsea pipeline. The facilities at WP and CPP are electrical system, radio telecommunication system (VSAT), Instrumentation system and pipelining. The electrical system is in construction stage. A lightning protection design is completed by client. powerQ was requested to review design and provide practicle recommendation for site implementation considering practical installation difficulties.
2. Project Description
Two GTGs, one duty and one standby, are provided at CPP as main power generation. CPP and WP are steel structures of which all major structural components are intended welded firmly to deck. The earth bars are intended to be bonded to platform legs.
3. Objective and Scope
This review was intended to address the need for lightning protection and electronic surge protection on CPP and WP. PowerQ Technology Pte Ltd was asked by EPC contractor to carry out a comprehensive evaluation of design and existing design of Lightning and earthing Protection System and make practical recommendation considering that the construction is ongoing.
The objectives of the lightning protection review study was to
- Review the design and recommendation
- To review whether external lightning terminal are required
- To review extend of SPD,s necessary and required
- Review the proposed lightning protection system against standards
- Suggest suitable practical recommendation based on current project status.
To address objectives PowerQ had undertaken following tasks:
a) Review of Design and specifications
b) Review Offshore code and standard
c) Review of various lightning protection measures
d) Review of current practice in offshore installation
The intent of review is to provide practical guidance and not to emphasis on theory of lightning. PowerQ evaluated several offshore installtion design and provided the best implementable Option to adopt and provide sufficient justifications for the recommendation thus meeting codes but minimising cost of installtion.
The work was performed in 2010 and shall be under continious review . PowerQ is also providing Power System Studies for this project and shall be providing services to client till 2011 as per contract.