Page 290 - Subyek Teknik Mesin - Forsthoffers Best Practice Handbook for Rotating Machinery by William E Forsthoffer

Steam Turbine Best Practices Be st Practice 5.2

Fig 5.1.8 Efficiency of single stage turbines (Courtesy of IMO Industries)

Best Practice 5.2

Size critical (un-spared) steam turbines for the maxi- and compared to the cost of re-rating the turbine after plant
mum possible driven equipment load (full curve power) start-up.
for maximum driven equipment flow rate, revenue and Lessons Learned
cost savings over costly driver re-rates after plant
Potential increased production rates have been negated by
start-up.
insufficient steam turbine power caused by steam condi-
Present industry practice for steam turbine power is to size the tion inadequacy and/or fouling, resulting in lost opportunity
driver for 10% greater power than the rated point of the driven
equipment. revenue until a costly re-rate project is approved, resulting
in millions of dollars of lost revenue.
Turbine fouling, lower than anticipated steam conditions and/or
driven equipment fouling will limit driven equipment flow rate and result
in reduced plant revenue. Benchmarks
The potential revenue increase from sizing the steam turbine This best practice has been used since 2000, when mega projects
for full curve power should be evaluated in the pre-FEED phase of have become the norm, and have allowed pre-investment in additional
the project against the added cost and reduced turbine efficiency, driver power based on additional revenue potential.

B.P. 5.2. Supporting Material

See B.P. 5.1 for supporting material.

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