Steam Turbine Code Types

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GE Power Systems

Code Designation Book for Steam Turbines

These instructions do not purport to cover all details or variations in equipment nor to provide for every possible contingency to be met in connection with installation, operation or maintenance. Should further information be desired or should particular problems arise which are not covered sufficiently for the purchaser’s purposes the matter should be referred to the GE Company.

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GEK 1 03567J C ode Des ign ation Boo k for Ste am Tu rb ine s

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I. CODE DESIGNATION BOOK FOR STEAM TURBINES

Revision Log Sheet

GEK 103567 – Revision I

SERIES REV LEVEL-TYPE OF CHANGE DATE

Code Book Rev. 4 - title page May 1999

A Series Rev. 2 - added new design A13 July 1997

A9 Rev. 1 - graphic change May 1996

A10 Rev. 1 - graphic and text change May 1996

A11 Rev. 1 - graphic and text change May 1996

A12 Rev. 1 - added design May 1996

A13 Rev. 0 - added new design July 1997

D10 Rev. 1 - graphic and text change May 1996

G Series Rev. 2 - added ship date G10 July 1997

G8 Rev. 1 - graphic change May 1996

G9 Rev. 1 - added design May 1996

G10 Rev. 2 - added ship date July 1997

SC Series Rev. 1 - added one design May 1996

SC5 Rev. 1 - added design May 1996

G Series Rev. 3 - revised turbine for design G8 July 1998

G Series Rev. 3 - added new design G11 July 1998

G11 Rev. 3 - added design July 1998

C Series Rev. 4 - added new design C9 May 1999

C9 Rev. 4 - added design May 1999

D11H Rev. 5 - added text for new design June 2001

D11H Rev. 6 - added new graphic and text June 2002

D8H Rev. 6 - added new graphic and text June 2002

G12 Rev. 6 - added new graphic and text June 2002

A14 Rev. 6 - added new graphic and text June 2002

A series Rev. 6 - updated schematics and added A14 June 2002

B series Rev. 6 - updated schematics June 2002

C series Rev. 6 - updated schematics June 2002

D series Rev. 6 - updated schematics June 2002

DP/DS series Rev. 6 - updated schematics June 2002

E series Rev. 6 - updated schematics June 2002

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GEK 103567J Code Designation Book for Steam Turbines

SERIES REV LEVEL-TYPE OF CHANGE DATE

F series Rev. 6 - updated schematics June 2002

FP/FS series Rev. 6 - updated schematics June 2002

G series Rev. 6 - updated schematics and added G12 June 2002

H series Rev. 6 - updated schematics June 2002

I series Rev. 6 - updated schematics June 2002

J series Rev. 6 - updated schematics June 2002

K series Rev. 6 - updated schematics June 2002

L series Rev. 6 - updated schematics June 2002

M series Rev. 6 - updated schematics June 2002

N series Rev. 6 - updated schematics June 2002

S series Rev. 6 - updated schematics June 2002

T series Rev. 6 - updated schematics June 2002

SC series Rev. 6 - updated schematics June 2002

SAC series Rev. 6 - updated schematics June 2002

SANC series Rev. 6 - updated schematics June 2002

DAC series Rev. 6 - updated schematics June 2002

DANC series Rev. 6 - updated schematics June 2002

Introduction Rev. 6 - updated drawing orientation and nomenclature June 2002

A series Rev. 7 - updated schematics July 2002

DP/DS series Rev. 7 - updated schematics July 2002

H series Rev. 7 - updated schematics July 2002

L series Rev. 7 - updated schematics July 2002

M series Rev. 7 - updated schematics July 2002

A Series Rev. 8– added new design A15 January 2003

A Series Rev. 8– added A15 to A series schematics January 2003 Introduction Rev. 8– updated for Fitchburg closing January 2003

A Series Rev. 9– updated A15 November 2003

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II. STEAM TURBINE CODE SYSTEM

Steam turbines designed and manufactured by GE in Schenectady, NY have been classified by an alpha-numeric code system since 1941. This booklet defines that system and lists the code designations of past and current designs. The code system categorizes steam turbine designs on the basis of overall construction configuration, and is not intended to define the detailed design of any specific unit. The configuration code type, however, is the most basic description of steam turbine design, and with the addition of specific information on megawatt rating, last stage bucket length, and steam conditions can be a useful description for many purposes.

Prior to 1987, GE produced large steam turbine generators for electric utility applications in Schenectady, medium steam turbine generators in Lynn, Mass., and small industrial units and mechanical drive turbines in Fitchburg, Mass. Since closing of the Lynn plant in 1987, turbines in the former Lynn product scope rated above approximately 40 MW have been produced in Schenectady and the smaller units in Fitchburg. The 40 MW division in product scope is only approximate and is subject to change in the future. Since closing the Fitchburg, Mass., 1998 all smaller size units have been produced in Schenctady.

The code system has been extended to include those designs previously built in Lynn and now produced in Schenectady. The addition of the Lynn turbine designs for industrial applications and the new designs developed in Schenectady for combined cycle greatly increases the variety of designs and the number of different code types in active use. Furthermore, many of the new code types are for relatively simple, single-casing, non-reheat machines, for which the relatively complex rules for defining new code types in use for more complex designs are not appropriate. Therefore, the code system has been divided into two sections. Section I, Reheat and Multi-Casing Non-Reheat Turbines includes the more complex configurations, and new code types are established in accordance with the traditional practice of the Schenectady code system. The reheat and two-casing, non-reheat designs previously produced in Lynn are included in Section I. The turbines of Section II, Single-Casing, Non-Reheat Turbines, are of relatively simple design with limited configuration variation and less complex rules are applied for defining code type.

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GEK 1 03567 J C ode Des ign ation Boo k for Ste am Tu rb ine s

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III. DRAWING ORIENTATION AND NOMENCLATURE CONVENTION

Because of the many turbine configurations that are in use it is necessary to adhere to a standard convention for defining direction of rotation, and in the use of nomenclature for identifying such components as valves, bearings and couplings.

The orientation shown below is standard practice for this code book and all other diagrams and cross sec-tions for technical and commercial purposes.

Orientation

Generator shown on the right, turbine on the left. Turbine End and Generator End of the turbine and Turbine End and Collector End of the generator oriented as shown. Left and right sides defined viewing from turbine to generator.

Rotation

Standard direction of rotation for all GE steam turbine generators covered by the code system is CCW, viewing the generator from the turbine end. It is important to recognize that rotation is defined for the unit and not for the steam turbine alone, and is independent of code type or the direction of steam flow. Non-standard rotation may be used in circumstances such as for a replacement turbine required to match rotation of an existing non-GE generator, and single-shaft combined cycle applications in which rotation is required to match the gas turbine’s, which is not consistent across the product line. Also, in the mid-1980’s a small number of units were produced in Lynn with non standard rotation based on designs previously applied in single-shaft combined cycle, and in the transition of product scope from Lynn to Schenectady, this was repeated on a small number of units.

Bearings

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Bearings are numbered sequentially beginning with the furthermost from the generator CE. For single shaft combined cycle applications that include the steam turbine in the middle of the train, bearing numbering starts with the gas turbine. Steam turbine bearing numbering designations in these configurations will typically begin with T3 vice T1. See the D10 Schematic as an example.

Couplings

Shaft couplings (when more than one) are designated A, B, C etc. from left to right. (In direction of increasing KW loading)

Packings

Packings are numbered sequentially beginning with the furthermost from the generator CE. Turbines that have a double shell may have two adjacent packing sections. In this situation the juxtaposed sections only receive one label designation. See the A8 schematic packing section N2, as an example.

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TABLE OF CONTENTS SECTION I

REHEAT AND MULTIPLE-CASING, NON-REHEAT STEAM TURBINES

SERIES

FULL-SPEED, REHEAT, SINGLE-FLOW CONDENSING TURBINES A

NO CURRENT USE B

FULL-SPEED, NON-REHEAT, DOUBLE-FLOW CONDENSING TURBINES C

FULL-SPEED, REHEAT, DOUBLE-FLOW CONDENSING TURBINES D

FULL-SPEED, TANDEM-COMPOUND, DOUBLE-FLOW, PRIMARY (DP) AND SECONDARY (DS) CONDENSING ELEMENTS FOR CROSS-COMPOUND, FOUR-FLOW, REHEAT TURBINES

DP/DS

NO CURRENT USE E

FULL-SPEED, REHEAT, TRIPLE-FLOW CONDENSING TURBINES F

FULL-SPEED, TANDEM-COMPOUND, TRIPLE-FLOW, PRIMARY (FP) AND SECONDARY (FS) CONDENSING ELEMENTS FOR CROSS-COMPOUND, SIX-FLOW REHEAT TURBINES

FP/FS

FULL-SPEED, REHEAT, FOUR-FLOW CONDENSING TURBINES G

FULL-SPEED, NON-CONDENSING ELEMENTS OF CROSS-COMPOUND

TURBINES H

HALF-SPEED, SINGLE-FLOW CONDENSING TURBINES J

HALF-SPEED, DOUBLE-FLOW CONDENSING TURBINES K

HALF-SPEED, TANDEM-COMPOUND DOUBLE-FLOW CONDENSING TURBINES L HALF-SPEED, TANDEM-COMPOUND FOUR-FLOW CONDENSING TURBINES M HALF-SPEED, TANDEM-COMPOUND SIX-FLOW CONDENSING TURBINES N

FULL-SPEED, REHEAT, SIX-FLOW CONDENSING TURBINES S

FULL-SPEED, NON-REHEAT, SIX-FLOW, CONDENSING TURBINES T

SPECIAL DESIGN SERIES Special

Design SECTION II

SINGLE-CASING, NON-REHEAT STEAM TURBINES CONDENSING TURBINES WITH NO CONTROLLED EXTRACTIONS OR ADMISSIONS

SC NON-CONDENSING TURBINES WITH NO CONTROLLED EXTRACTIONS OR

ADMISSIONS

SNC CONDENSING TURBINES WITH A SINGLE CONTROLLED EXTRACTION OR

ADMISSION

SAC NON-CONDENSING TURBINES WITH A SINGLE CONTROLLED EXTRACTION

OR ADMISSION

SANC CONDENSING TURBINES WITH TWO CONTROLLED EXTRACTIONS OR

ADMISSIONS

DAC NON-CONDENSING TURBINES WITH TWO CONTROLLED EXTRACTIONS OR

ADMISSIONS

DANC

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IV.

SECTION I

REHEAT AND MULTIPLE-CASING, NON-REHEAT STEAM TURBINES

This category of turbines includes all reheat designs and all non-reheat designs of more than one casing. Designs in this category previously produced in Lynn, Mass. are included. However, the listing of prototype turbines for each code in the pages that follow refers to the first unit made in Schenectady.

A. Rules for Establishing Code Designations

For any new turbine design, selecting the proper code classification, assigning new classifications, etc., is governed by the following basic rules:

1. The basic code-series designation, (A, B, C, D, etc.) the first characteristic in the code, is deter-mined by the following characteristics:

a. Full speed (3000, 36000 rpm) vs. half speed (1500, 1800 rpm) b. Tandem vs. cross-compound

c. Number of Low Pressure flow paths (single, double, triple-flow, etc.) d. Reheat vs. non-reheat

e. Condensing vs. non-condensing

2. Variation in any one or more of the following basic details, within any given code classification, will result in the assignment of a new code number (1, 2, 3, etc.) for any specific turbine. a. Location of main steam control valves (separate chest vs. shell mounted)

b. Location of Intercept Valves (on the upper shell vs. separately-mounted) c. Internal vs. external low-pressure crossover pipes

d. Relocation of thrust bearing

e. Change in number or location of main journal bearings or couplings

f. Conventional bolted-in first stage nozzle (including the expanding nozzle-chest design) vs. the separately supported nozzle boxes

g. HP-IP sections in combined casing vs. separate casings h. Conventional bolted-in partial arc nozzle vs. 360 nozzle

3. Additional breakdown of important characteristics within a certain code number is indicated by the final letter of the designation. The following is a definition of those suffixes:

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a. A - HP section turned 180

b. D - Double shell construction at the reheat inlet

c. E - LP sections using exhaust hoods with the casing exposed at the center portion

d. H - LP section exhaust hood designed for high temperature due to high backpressure appli-cation

e. R - Reheat turbine to be used with light- or heavy-water reactors f. X - Specialized application not likely to be repeated

4. In order to limit the multiplicity of turbine code number assignments and to keep these in accord with the basic objective of the code designation system, the following basic variations in similar turbines are not considered relevant enough to change the code designation:

a. Top, bottom single or double cross-over pipe connections

b. Reheat shells with separately mounted intercept valves may have either four steam inlet con-nections (two upper and two lower shell) or simply two lower concon-nections

c. 3000 rpm (50 cycle) units relative to 3600 rpm (60 cycle) machines. Similarly, no change in code classification of 1800 rpm units will be made for similar designs at 1500 rpm, 1200 rpm, etc.

d. The control valve casings mounted on the high pressure shell may be either flanged or welded construction, and individual or multiple valve chest assemblies

e. Turbines employing the expanding-nozzle-chest type inner high-pressure shell will still carry the same code designations as used for similar units with the earlier-type inner shell arrange-ment

f. Overload stage valves (considered as an integral component of the main control valves) g. Combined reheat valves instead of separate intercept and reheat stop valves

h. Single flow vs. double flow nozzle boxes. 90 vs. 180

i. One or two reheat stages in the moisture separator/reheater, or 2 vessels vs. 4 vessels j. Down or side exhaust on LP section(s)

k. Partial arc admission nozzle box vs. 360 nozzle box

l. Sliding or flexible leg support under front or middle standards

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V.

A SERIES

FULL-SPEED, REHEAT, SINGLE-FLOW CONDENSING TURBINES

The A series, in modern practice, includes single-casing and multiple-casing designs and is restricted to reheat turbine only. The earlier definition for the A series code included non-reheat designs. The non-reheat code types A1, A2, A3 and A4 have not been built since the early 1950’s.

Code Type Prototype Turbine Ship Date

A1 80967 8/48 A2 80974 2/48 A3 93374 10/52 A4 34665 9/41 A5 108827 11/51 A6 198057 5/89 A7 198082 4/91 A8 270T236 12/92 A9 270T250 6/95 A10 270T320 5/95 A11 270T335 12/95 A12 270T369 12/96 A13 270T412 8/99 A14 270T646 9/03 A15 5/04 13

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A14

Off-Shell Control Valves(s), Double-Shell High Pressure

Section With Reaction Staging, Generator on High

Pressure End, Sliding Support of Shell on Front Standard.

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Off-Shell Control Valves(s), Double-Shell High Pressure

Section With Reaction Staging, Generator on High

Pressure End, Sliding Support of Shell on Front Standard.

For Single Shaft Combined Cycle and Multi Shaft

Combined Cycle.

A15

Low Pressure

Section _SectionReheat High PressureSection

Reheater

GEK 103567J

Code Designation Book for Steam Turbines

Off-Shell Control Valves(s), Double-Shell High Pressure

Section With Reaction Staging, Generator on High

Pressure End, Sliding Support of Shell on Front Standard.

Fixed Support of Shell on Fixed Mid Standard, Sliding Low

Pressure Exhaust Hood. For Single-Shaft and Multi-Shaft

Combined Cycle.

A15

Low Pressure

Section _SectionReheat High PressureSection

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VI.

B SERIES NO CURRENT USE

The B series, in modern practice, is reserved for future use. Formerly, the B series code types were applied to full-speed, non-reheat, double-flow designs having one end of the low-pressure rotor supported by the TE generator bearing. These designs have not been built since about 1951. Any future use of a B series code would begin with B3 since some B1 and B2 type turbines many still be in service.

B1 80992 3/48

B2 93337 8/51

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VII.

C SERIES

FULL-SPEED, NON-REHEAT, DOUBLE-FLOW CONDENSING TURBINES

These designs, in code types C1, C2 and C3, were built in Schenectady until the early 1950’s and then exclusively in Lynn until the first C4 was built in Schenectady in 1987.

C1 80945 1/48 C2 none none C3 87459 5/51 C4 270T174 12/87 C4E 198063 11/89 C5E 198096 8/91 C6 198072 5/90 C7 270T256 7/93 C8 270T268 9/93 C9 270T456 8/00 27

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VIII.

D SERIES

FULL-SPEED, REHEAT, DOUBLE-FLOW CONDENSING TURBINES These double-flow, reheat designs have been built in large numbers since 1950.

D1 99648 8/53 D2 83679 6/50 D3 108841 12/55 D4 108855 4/57 D5 118317 9/60 D6 128950 1/61 D7 170X227 1/64 D8 170X253 6/65 D8D 170X380 12/69 D8H 170X672 7/75 D9 170X401 5/70 D10 270T195 5/94 D11 270T209 8/92 D11H 270T528 2/02 35

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D8H

Same as D8 Except Special Low-Pressure Section Design for High Back Pressure Condition and Mid-Standard.

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D11H

Same as D11 Except Special Low-Pressure Section Design for High Back Pressure Condition and Mid-Standard.

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IX.

DP/DS SERIES

FULL-SPEED, TANDEM-COMPOUND, DOUBLE-FLOW, PRIMARY (DP) AND SECONDARY (DS) CONDENSING ELEMENTS FOR CROSS-COMPOUND, FOUR-FLOW, REHEAT

TURBINES

The turbines in this group represent the Primary and Secondary elements of cross-compound machines. Considerable similarity in general design and arrangement exists between this code series and the D series, however, the two are classified separately because the DP and DS individual elements are not designed to operate as independent tandem units.

The term primary identifies the element of the cross-compound turbine that contains the highest (initial steam) pressure; the term secondary identifies the mating element of the turbine

DP1 118389 4/60 DP2 128902 9/59 DP3 128931 1/63 DS1 128903 9/59 DS2 128934 2/63 45

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X.

E SERIES NO CURRENT USE

The E series, in modern practice, is reserved for future use. Formerly the E series applied to full-speed, non-reheat, triple-flow turbines. Code type E1 turbines were built prior to about 1953. Any future use of an E series code would begin with E2 since some E1 units may still be in service.

E1 80958 7/48

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XI.

F SERIES

FULL-SPEED, REHEAT, TRIPLE-FLOW CONDENSING TURBINES

These triple-flow, reheat units were built in large numbers between 1951 and the mid-1960’s. With devel-opment of longer last stage buckets, triple-flow designs are no longer produced.

F1 87463 7/51 F2 99639 6/52 F3 93354 10/52 F4 101606 7/54 F5 115019 10/57 F6 108881 10/57 F7 115073 3/58 F8 115035 6/58 F9 118322 8/58 F10 118369 11/59 F11 128952 8/61 F12 170X197 12/63 55

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XII.

FP/FS SERIES

FULL-SPEED, TANDEM-COMPOUND, TRIPLE-FLOW, PRIMARY (FP) AND SECONDARY (FS) CONDENSING ELEMENTS FOR CROSS-COMPOUND, SIX-FLOW REHEAT TURBINES The turbines in this group represent the Primary and Secondary elements of cross-compound machines. Considerable similarity in general design and arrangement exists between this code series and the F series, however, the two are classified separately because the FP and FS individual elements are not designed to operate as independent tandem units.

Each element has either a high-pressure or reheat section and, depending upon whether the design is for single or double reheat, a reheat and/or intermediate-pressure section, both elements have a triple-flow, condensing low pressure section.

The term primary identifies the element of the cross-compound turbine that contains the highest (initial steam) pressure; the term secondary identifies the mating element of the turbine.

FP1 118307 3/59

FP2 118356 11/59

FS1 118308 3/59

FS2 118357 11/59

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XIII.

G SERIES

FULL-SPEED, REHEAT, FOUR-FLOW CONDENSING TURBINES

These designs are all tandem-compound, four-flow, condensing turbines except for code type G1 which was used as the secondary element of a cross-compound turbine.

G1 93340 3/52 G2 170X188 10/62 G2D 170X191 6/67 G3 170X228 1/66 G3D 170X284 12/65 G4 170X321 1/67 G5 170X297 9/67 G5E 170X362 6/68 G6 170X456 8/71 G7 170X541 12/72 G8 270T159 5/86 G9 270T345 3/96 G10 270T380 6/98 G11 270T427 2/00 G12 270T638 12/03 67

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G12

Double-Shell High Pressure (HP)/Intermediate Pressure (IP) Section with Combined HP/IP inner shell, Nozzle Boxes, Separate Control Valves, and Separate Intercept Valves, Tandem Double-Flow Exhaust Hoods, Two Separate Condenser Openings, and Thrust Bearing in Front Standard.

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XIV.

H SERIES

FULL-SPEED, NON-CONDENSING ELEMENTS OF CROSS-COMPOUND TURBINES This series includes all of the non-condensing elements of cross-compound steam turbines. All are reheat except code types H1 and H2 which were either used with non-reheat units or the reheat section was on the secondary element. Some H1 Turbine built in the 1930’s may have been used as back-pressure machines exhausting into headers rather than to the secondary shaft of a cross-compound unit.

H1 80993 10/48 H2 83601 3/49 H3 93339 8/58 H3A 108872 3/57 H4 93390 12/52 H5 99667 7/54 H6 101651 10/54 H7 108870 2/57 H8 108866 9/57 H9 115006 7/57 H10 101650 9/57 H11 115099 7/58 H12 115053 8/58 H12A 128924 9/60 H13 128927 12/59 H14 170X114 8/61 H15 170X122 5/63 H16 170X142 7/63 H17 170X224 5/64 H18 170X264 7/65 H19 170X177 1/64 H19A 170X181 6/67 75

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XV.

J SERIES

HALF-SPEED, SINGLE-FLOW CONDENSING TURBINES

These turbines are single-flow, 1500 and 1800 rpm machines. Code type J1 is tandem-compound but all of the others have been used as the secondary shafts of cross compound turbines. It is not expected that these designs will be built in the future because full-speed, tandem-compound designs can be built for the same rating at less cost.

J1 56625 1/48

J2 108873 2/57

J3 115023 7/57

J4 170X265 8/65

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XVI.

K SERIES

HALF-SPEED, DOUBLE-FLOW CONDENSING TURBINES

These half speed designs are used as the low-pressure element of cross-compound turbines. There is likely to be limited application for these designs in the future because full-speed, tandem-compound turbines can generally be built at the same rating for less cost.

K1 83631 7/50

K2 99678 3/54

K3 115007 6/57

K4 128925 9/60

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XVII.

L SERIES

HALF-SPEED, TANDEM-COMPOUND DOUBLE-FLOW CONDENSING TURBINES These designs have a high-pressure or reheat section and a separate double-flow low-pressure section. Fossil plant applications have been both as non-reheat, tandem-compound turbines and as the secondary element of reheat cross-compound turbines. Neither has been produced since the 1950’s. Code types L4, L5 and L6 were used as small nuclear applications.

L1 83600 4/49 L2 87465 3/51 L3 83642 5/49 L4 170X210 4/64 L5 170X349 10/68 L6 170X484 7/72 97

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M SERIES

HALF-SPEED, TANDEM-COMPOUND FOUR-FLOW CONDENSING TURBINES These designs have been used as the low-pressure element of cross-compound turbines in two and three casings, and as complete tandem-compound turbines in three casings.

M1 170X115 9/61 M2 170X247 10/64 M3 170X182 12/66 M4 170X343 4/68 M4R none none M5 170X346 6/68 M5R 170X684 9/75 M6 170X417 3/70 M6R 170X465 8/72 M7 170X408 none M7R 170X468 10/71 103

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XIX.

N SERIES

HALF-SPEED, TANDEM-COMPOUND SIX-FLOW CONDENSING TURBINES This tandem-compound, six-flow design has been used for the largest nuclear applications.

N1 170X326 2/68

N1R 170X290 8/66

N2 170X399 7/70

N2R 170X392 6/70

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XX.

S SERIES

FULL-SPEED, REHEAT, SIX-FLOW CONDENSING TURBINES

These tandem-compound, six-flow turbines can be used for the very largest tandem units. Initial steam con-ditions have been sub-critical and super-critical with single-reheat, and super-critical with double-reheat.

S1 170X270 10/65

S1E 170X332 10/67

S2 170X540 10/72

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XXI.

T SERIES

FULL-SPEED, NON-REHEAT, SIX-FLOW, CONDENSING TURBINES

This design is for use in non-reheat applications where erosion considerations limit last stage bucket length. The only unit designed was for application with a breeder reactor providing steam at 1450 psig and 900 F. The plant was never completed.

T1 170X844 none

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XXII.

SPECIAL DESIGN SERIES

The following units represent turbine designs for specialized application with little probability of being applied again. The first letter of each code number indicates the appropriate code series for the design configuration and the following “X” indicates that the unit is for specialized application. These machines are included for general information and future reference.

DX1 101685 2/56

FX1 108812 4/56

FX2 108863 6/56

LX1 115064 11/58

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XXIII.

SECTION II

SINGLE-CASING, NON-REHEAT STEAM TURBINES

The turbines in this category are all full-speed, non-reheat, single-casing, single-flow, two-bearing designs and are simpler in configuration and construction than those of Section I. Fewer variations in configuration within each code series are possible. Most of these configurations were produced in Lynn prior to 1987. However, the Lynn plant did not have a formal system of configuration codes. The listing of prototype turbines identifies the first unit of each code type made in Schenectady. Where applicable, these code designations may be applied to turbines built earlier in Lynn. In general, however, new code types are not established for turbine configurations made in Lynn that have not since been produced in Schenectady. A. Rules for Establishing Code Designations

1. The basic code series is defined by a combination of two or more letters based on whether a. Condensing or non-condensing

b. Number of controlled extractions or admissions (0,1 or 2)

2. Code numbers (1, 2, 3 etc.) within a code series are assigned to identify whether a. Generator driven from the HP or LP end

b. Shell-mounted control valves and inlet governing stage or full-throttling, off-shell valve(s)

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XXIV.

SC SERIES

CONDENSING TURBINES WITH NO CONTROLLED EXTRACTIONS OR ADMISSIONS

SC1 198068 3/90 SC2 198055 9/88 SC3 270T238 12/92 SC4 198052 7/88 SC5 270T347 6/96 XXV. SNC SERIES

NON-CONDENSING TURBINES WITH NO CONTROLLED EXTRACTIONS OR ADMISSIONS

No code types assigned.

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XXVI.

SAC SERIES

CONDENSING TURBINES WITH A SINGLE CONTROLLED EXTRACTION OR ADMISSION

SAC1 198058 11/88 SAC2 198060 7/89 SAC3 270T294 11/94 SAC4 270T296 8/94 XXVII. SANC SERIES

NON-CONDENSING TURBINES WITH A SINGLE CONTROLLED EXTRACTION OR ADMISSION

SANC1 198064 12/89

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XXVIII.

DAC SERIES

CONDENSING TURBINES WITH TWO CONTROLLED EXTRACTIONS OR ADMISSIONS

DAC1 198062 9/89

DAC2 270T218 8/92

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XXIX.

DANC SERIES

NON-CONDENSING TURBINES WITH TWO CONTROLLED EXTRACTIONS OR ADMISSIONS

DANC1 198067 5/90

DANC2 270T291 10/94

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GE Power Systems

General Electric Company

One River Road, Schenectady, NY 12345 518 • 385 • 2211 TX: 145354