Method of increasing service interval periods in a steam...

Details Method of increasing service interval periods in a steam... Method of increasing service interval periods in a steam...

2011-06-07

2011-06-07

Denion, Thomas E (Department: 3748)

Power plants

Motive fluid energized by externally applied heat

Power system involving change of state

C411S378000, C411S914000

Reexamination Certificate

active

07954323

ABSTRACT:
A method of increasing service interval periods in a steam turbine by neutralizing sodium hydroxide in contaminated steam in a high temperature and a high pressure portion of a steam turbine by placing a protective covering over at least a portion of each of the bolts of a nozzle block assembly. The protective covering neutralizes contaminants in contaminated steam to reduce stress cracking of the bolts during steam turbine operation, and thus extend the useful life of the bolts and reduce the need for service work to repair or replace damaged bolts.

REFERENCES:
patent: 3298272 (1967-01-01), Henderson
patent: 4890967 (1990-01-01), Rosenbaum
patent: 6755613 (2004-06-01), Schmitz
patent: 6964554 (2005-11-01), Groenendaal et al.
patent: 2004/0208726 (2004-10-01), Bohme et al.

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