Apparatus and methods for minimizing or eliminating solid partic

Details Apparatus and methods for minimizing or eliminating solid partic Apparatus and methods for minimizing or eliminating solid partic

1991-12-31

1993-10-05

Kwon, John T.

Rotary kinetic fluid motors or pumps

Casing and spaced housing with space vented to working fluid

4152092, 4152093, F01D 514

Patent

active

052499189

ABSTRACT:
The reheat tub in a double-flow steam turbine is provided with additional setback from the rotor buckets by forming a three-part reheat tub construction including first and second discrete diaphragm segments and third inner ring segments. The annular arrays of these segments are dimensioned to enable greater axial spacing between the nozzles and buckets. To refurbish an in-service double-flow turbine, the damaged reheat tub is removed and cut along axial and radial part lines to form discrete first and second diaphragm segments. The diaphragm segment nozzles are then refurbished by adding weld material and machined to the appropriate configuration. Material is added to the downstream and removed from the upstream faces of each diaphragm so that it may be located in the turbine shell similarly as the removed tub, but with the nozzles spaced further axially upstream of the buckets.

REFERENCES:
patent: 4015910 (1977-04-01), Harmon et al.
patent: 4029432 (1977-06-01), Meylan et al.
patent: 4634340 (1987-01-01), Stetter
patent: 4764084 (1988-08-01), Parker et al.
patent: 4776765 (1988-10-01), Sumner et al.
patent: 5024579 (1991-06-01), Groenendaal, Jr.
patent: 5104285 (1992-04-01), Groenendaal, Jr.
"Reducing Solid Particle Erosion Damage in Large Steam Turbines" Sumner et al., GE Turbine Reference Library, Copyright 1985, General Electric Co.

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