Is dual independent starting systems required on the main generator for a 3-tier power system (emergency, essential and main)?
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Some information on Essential Power Generator and Emergency Power Generator:
Essential Power Generator
The essential generator(s), if required, should start automatically on main power failure.
The essential power generator should be diesel engine driven with a self-contained cooling system. There should be two independent starting systems capable of minimum three start attempts each allowing minimum six consecutive starts. Air receivers for an air starting system should be sized for 6 consecutive starts.
Emergency Power Generator
The emergency power generator should start automatically on main power failure.
The emergency power generator should be diesel engine driven with a self-contained cooling system. There should be two independent starting systems capable of minimum three start attempts each allowing minimum six consecutive starts. Air receivers for an air starting system shall be sized for 6 consecutive starts.
The emergency generator and its associated switchboard should be installed in its own compartment in a safe area and should operate in parallel with or independent of other TLWP power systems. The emergency generator should be capable of black-start.
Further information on the main generators for those who need to know
The main power generators should have sufficient capacity to supply power for all the Platform topsides, marine systems, accommodation and drilling package electrical loads, simultaneously. Main power generation system may be configured, installed and protected in such a way as to eliminate the need for an essential power generator.
All main power generators should be equipped for dual fuel operation. Fuel gas should be the primary fuel source and marine distillate fuel (all grades and all sulphur contents) should serve as the alternative. During initial drilling operational phase fuel gas will not be available.
Each generator should be equipped with automatic synchronizing capability to allow parallel operation for load sharing and power transfer between all units. The control systems should include functions for auto-starting each unit, auto-synchronizing of all units and manual synchronizing under test conditions.
The main power generators should be designed and sized to satisfy the following requirements: