May 2011

Columns

HP Reliability: Consider ‘water washing’ for steam turbines

Occasions may arise when deposits form on the internal parts of steam turbines. The accumulation of these deposits may be indicated by a gradual increase in stage pressures over time with no evidence ..

Bloch, H. P., Hydrocarbon Processing Staff; Dowson, P., Elliott Group

Occasions may arise when deposits form on the internal parts of steam turbines. The accumulation of these deposits may be indicated by a gradual increase in stage pressures over time with no evidence of vibration, rubbing or other distress. Such deposits have a marked detrimental effect on turbine efficiency and capacity. When deposits cause extensive plugging, thrust-bearing failure, wheel rubbing and other serious problems can result. Deposit types. Deposits are classified as water insoluble and water soluble. The characteristics of these deposits should be determined by analyzing samples, and corrective measures should be taken to eliminate such deposits during future operation. When it

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