Steam Turbine Start-Up Failure – Blackstone Technical Services

Rubbing of Blades

Sketch of casing bow

Bottom half insulation blanket thickness

LocationU.A.E

ApplicationFloating Storage & Regasification Unit (FSRU)

Machine TypeN. 2 Steam Turbines

ServicePower generation

Power10 MW

Turbine trip during start-up on both units. Severe damage to the rotors due to rubbing against the stator

RCA indicated casing bow (non uniform expansion), resulting from an insufficient thermal insulation of the casing
Re-calculation of the thickness of the thermal insulation
Suggested new procedure for turbine warm-up
Revised seal radial clearance

Turbine started up and is now working correctly