50MW Steam Turbine
Generator
THE ENGLISH ELECTRIC
COMPANY LIMITED
STEAM TURBINE NO. S.T.
1143
BRIEF TECHNICAL PARTICULARS
| Maximum Continuous Rating | 50 M.W. |
| Speed | 3,600 r.p.m. |
| Inlet Steam Pressure | 1,450 psig |
| Total Temperature | 1000 F |
| Vacuum at Exhaust (Bar 30") | 29" Hg. at 50MW |
| Final Feed Temperature | When feed heating 449 F at 50MW |
As shown on the accompanying Sectional Arrangement Drawing
R277/621 the turbine is of the two cylinder impulse-reaction type.
The
machine comprises an H.P. cylinder having one Curtis stage and 17 impulse stages
and double flow L.P. cylinder having a first stage of the impulse type and five
reaction stages in each flow. The H.P. cylinder is so arranged that the
steam flow is away from the rest of the turbine and alternator. By tending
to balance the thrusts, the arrangement relieves the load on the single thrust
bearing provided to control the axial flow of the whole turbo-alternator
unit.
The H.P. and all but the last stage of the L.P. blades are mounted
in grooves in the forged steel rotors. The final stage of the L.P. has, for each
flow, a forged steel disc which is shrunk and keyed on to the shaft. The
last row L.P. blades are of the side entry type in which each root is in a
separate groove cut across the disc head.
The nozzles of the H.P. turbine
are carried in built up type diaphragms. Cast iron diaphragms are provided
to carry the first stage impulse nozzle and the final stage fixed blading in the
L.P. cylinder.
Steam packed labyrinth glands are provided for each
cylinder.
Turbine/Generator Details
| Unit Design Rating | 50 MW |
| In Service Date | November 1961, Manufactured by English Electric |
| Operating Hours to Date | 85,273, last operation 1995 |
| Number of Starts to Date | Cold Starts 267, Hot Starts 788 |
| Design Steam Conditions | Steam Flow 415,000 pph, Inlet steam pressure/temperature - 1450 psig/1000 F, Exhaust Pressure 1.0 Abs. |
| Turbine Details | Single flow HP Turbine, 1 Curtis stage, 17 rows impulse blading, with four extractions. Double flow LP Turbine - 6 rows reaction blading with one extraction. |
| Generator Details | Hydrogen Cooled Generator at 45 psig pressure. 13800 volts, 58824 KVA 2462 A, 0.85 P.F. |
| Maintenance History | HP Turbine last inspection 1989. LP Turbine last inspection 1985 |
Contact Lane Kadel for more
details. Phone:
503-239-5157
Fax:
503-239-5136
Email:
lane@rmaglobal.com
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