API - Turbine Shutdown system

12.3.1.2 . If the turbine Vendor provides the shutdown system with the turbine, the turbine Vendor shall have unit responsibility for the entire shutdown system. If the trip system is not supplied by the turbine Vendor, the Supplier has to supply the response time of the trip systems component and the turbine Vendor shall review and comment on the proposed system.
12.3.1.3. The turbine system shall include on-line diagnostics, testing functions and be able to be repaired on-line .

12.3.3. Electro-hydraulic solenoids valves
12.3.3.5 The trip solenoids valves shall be provided with facilities to allow testing of the solenoid valve function while the turbine is in operatio n.

12.4 Other alarms and shutdowns

12.4.11. With the exception of the steam trip and throttle valve, it shall be possible to test every component of every shutdown function while the equipment is in operation. The testing of component associated with a shutdown function shall not require disarming of any other shutdown function nor any alarm function.

16.3.4.7. Field system overspeed shutdown systems response test

If specified, after complete field installation, the Vendor is responsible or responsible party is required to provide Purchaser with actual measured total shutdown response times for at least four overspeed trip events as proof that the total system response time.

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