Steam Turbine Generator
Root cause of failure identified, preventive action provide. Apportion responsibility and liability
Steam Turbine Failure Investigation
Identify the root cause of catastrophic steam turbine failure and detail action required to prevent re-occurrence.
Our client asked us to carry out an investigation on a steam turbine blade failure onboard their FPSO (Floating Production Storage and Offloading) vessel, which had suffered previous blade related failures since it had been commissioned. Our brief was to identify the root cause of the failure and to recommend solutions to prevent any future problems identified.
During the investigation two independent failures were identified, the second and final event occurred as a direct result of the first failure.
Producing a report that represents the facts of the case, that is supported by objective evidence in the form of data, images, and where required external expert supplementary reports.
We keep in continuous communication with our client’s leadership and operations teams to ensure they are up to date as the inspection progresses.
The Gland steam condenser was not operational (fans stopped) once started the delta T across the cooling water supply and discharge proved that the system is not working due to the fan having insufficient suction capacity for the 4.5m head.
A drain was marked on the P&ID, but was not found, there was no steam trap in the system, and therefore it is almost certain that the pipework is flooded with water.
There was evidence on the exhaust end of the starboard turbine that condensate from the glands was leaking onto the casing, it was recommended that a steam trap be fitted on these lines.
The root cause of this failure was due to the 10th stage blades rubbing against the diaphragm blade shield, on multiple occasions over an undetermined period of time. This was likely caused by insufficient blade to diaphragm shield clearance and / or rotor displacement (hogging).