2 Turbine and Accessories

7/30/2019 2 Turbine and Accessories

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GUARANTEED TECHNICAL PARTICULARS(SCHEDULE I)

2. TURBINE AND ACCESSORIES

2.1. Guaranteed Technical Particulars

ITEM DESIGNATION UNITS VALUE REMARKS

1. General

1.1 Manufacturer/ Type designation - Voith Hydro

Pvt. Ltd. India.

1.2 Place of manufacture - India/Austria

1.3 Applicable standards - IS, DIN, BS,ASTM, ISO,

Voith Norms

Main data

2. Turbine output

2.1 Turbine rated output at rated net

head of 396.2 m 395.96 m, at rated

speed

kW 51020

2.2 Continuous overload output under

conditions at rated net head of 396.2

m 395.96 m, rated speed and less

than 100% nozzle opening.

KW 56122

2.3 Minimum output at the following

heads and at rated speed

Maximum net head of 400.70 m

400.46 m

kW 8500

Minimum net head of 387.20 m

386.96 m

kW 8500

2.4 Rated speed rpm 375

2.5 Maximum runaway speed at

following net head

at maximum net head of 400.70 m

400.46 m

rpm 657

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at minimum net head of 387.20 m

386.96 m

rpm 636

2.6 Water discharge under rated turbine

output as per 2.1 above

m/s 14.38

2.7 Maximum leakage through needles

at maximum static head of 400.70 m

414.1 m

L/s 0.00033 At maximum static

head

2.8.1 Maximum hydraulic axial thrust

under 2 jet /4 jet/multiple 6 jet

operation

kN 10/20/30

(approx)

Non Transient

2.8.2 Maximum total load on thrust

bearing generated from turbine

kN 150 (approx)

2.9 Axial thrust at 110 % rated load

rejection

kN 34 (approx) Transient

2.10 Fly wheel effect of turbine rotating

parts

kgm 6400 Polar moment of

inertia, J

2.11 Fly wheel effect required from thegenerator kg m 203600 Polar moment of inertia, J

3. Efficiency

3.1 Turbine efficiency at rated net head

of 396.20 m 395.96 m and rated

speed

at 110 % continuous rated output % 91.10*




3.2 Weighted average efficiency

(according to the particular technical

specification)

% 91.50 Weighted average

efficiency is

guaranteed at water

temperature of

10C.

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3.3 Turbine efficiency at maximum net

head of 400.70 m 400.46 m and atrated speed and at 100% continuous

rated output

% 91.51*

3.4 Turbine efficiency at minimum net

head of 387.20m 386.96 m and rated

speed and at 100 % continuous rated

output

% 91.41*

3.5Specific speed per jet of unit at rated

net head of 396.2 395.96 m with

100% nozzle opening & 110 %power

Rpm in

(m-KW)

20.533

3.6 Guaranteed minimum factor of

safety and name of the part under

worst conditions based on minimum

yield point of material

- 1.5, Runner.

3.7 Speed rise at a rated net head of

396.2 m 395.96 m

110% full load to zero % Less than 25%

Full load to zero % Less than 25%.

75% full load to zero %Less than 25%



3.8 Maximum water hammer pressure

rise when all 2 units at 110 % full

load simultaneously rejecting load

%Less than 15 %

of Maximum

static head

3.9 Critical speed of turbine power unit rpm822

4 Cavitation guarantee (Based on 24

months or 8000 hrs of operation)

kg0.95 kg As per page 2-5 of

Vol. 3 PART -I

(PTS)

d5. Maximum noise level at a distance

of 1 m at rated operation in turbine

pit

dB(A)90

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6.0 Weight of finished-machined runner

complete

Kg 8300(Approx)

a) Weight and designation of

heaviest part or assembly of the

turbine as prepared for shipment

kg 10000 (approx)

Distribution

pipe segment

Heaviest turbine assembly to be

handled by powerhouse crane

during installation

kg Same as above

7.0 Dimensions

Turbine shaft diameter

Turbine shaft Length

mm

mm

560mm

3500mm

(approx)

*Single point efficiencies & corresponding needle openings and discharges are not

guaranteed. The guaranteed weighted average efficiency is hydraulic efficiency of turbine.

2.2. Informative data


1. Turbine water discharge quantities

under rated output at rated head m/s 14.38

under maximum overload operation

at rated net head

m/s 15.88

at maximum runaway condition at

maximum net head

m/s 2.88 per nozzle

(approx)

at no-load at rated net head & rated

speed

m/s 1 (approx)

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2. Nozzle opening

at rated speed for no- load condition

at rated head of 396.20 395.96 m

% 22 % (for 1

nozzle)

at full- load condition at net head of

396.20 395.96 m

% 67 % (approx)

at 110% load condition at net head of

396.20 395.96 m

% 81 % (approx)

at 110% load condition at maximum

net head of 396.20 400.46 m

% 78 % (approx)

3. Turbine runner

inner wheel diameter mm During detailed

engg.

outer wheel diameter mm 2762 Outer most dia of

runner

pitch circle diameter mm 2169

peripheral velocity m/sec. 42.6 (approx) At pitch circle.

number of buckets Nos. 20

width of buckets mm 645 Inner width.

material & composition and

conforming standard

- EN-10250

X3CrNiMo13-4

or equivalent

+

EN-10283

GX4CrNiMo13-

4 or equivalent

Weight Kg 8300(approx)

Preventive coating against hydro

abrasion

- Hard HVOF

coating

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Lowering and runner removal

arrangement

- Lowering by

EOT craneRemoving with

trolly through

separate hatch.

Whether statically/dynamically

balanced in the shop

- Statically

4. Turbine Shaft

i) Material composition and

conforming standard

- ASTM A 668,

Grade-D

ii) Diameter

a) Shaft mm 560

iii) Length mm 3500(approx)

iv) Weight Tonnes 7.0(approx)

v) Type of coupling with generator

shaft and turbine runner

- Friction

Coupling

vi) No. and diameter of flange bolts No.

/mm

Friction

Coupling

vii) Material of coupling bolts, nuts,

washers at its end flanges

- 34CrNiMo6/

Equivalent

viii) Type of bolts - Suitable for

friction coupling.

ix) Provision made for shaft andrunner lifting

- During detailedengg.

Yes, Provision willbe made

5. Distributor

Type - Spiral

Material & composition and

conforming standard

- S355

J2G3/equivalent

Only for parts

under water

pressure like

segments, sickle

and flanges.

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internal diameter of inlet mm 1200

Material thickness mm During detailed

engg.

Number of prefabricated sections of

distributor

Nos. During detailed

engg.

Quadrant dimensions of the

distributor (Outline dimensions)

mm 10500 x 11000

(Approx)

Maximum design working pressure Kg/cm2 48

Test pressure Kg/cm2 72

Velocity of water at rated conditions m/sec 12.71

Size of manhole Mm x

mm

Dia. 600

Total weight of distributor Tonnes ~23

Weight of heaviest section Tonnes ~10

Method of embedding distributor in

concrete and details of flexible

packing/ wrapping material

- During detailed

engg.

Size of man door provided in the first

section

mm X

mm

Given under

manhole above

6. Nozzle

Inlet/outlet diameter mm

/mm

700/250

Material of Spear tip and conforming

standard

- X3CrNiMo13-4

EN10250/

Equivalent

Material of Nozzle tip and

conforming standard

- EN 10250 X 3

CrNi 13 4

+QT /Equivalent

Number of jets Nos. 6

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Range of Movement of Needle from

full close to full open

mm ~165

6.1 Brake jet

Material of brake jet and conforming

standard

- E355/iquivalent

Number Nos. 1

Diameter mm During detailed

engg.

Brake jet will be

applied at speed % 120

removed at speed % 20

7. Turbine housing

a) Top cover Outer Housing

Material and construction - IS2062 Gr. B/Equivalent

Dimension of head cover Outer

Housing

mm x

mm x

mm

Dia.7100 x

Hight. 3300

(Approx)

Thickness mm 20

Nos. of sections Nos. During detailed

engg.

Total weight Kg Approx. 15000

Means of handling top cover in the

pit

- During detailed

engg.

Elevation of highest and lowest point mm Highest -

1339.21m ,

Lowest - 1336.36

m.

Aeration pipes

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Material - Carbon Steel

Size mm DN 900

(Approx)

Size of main pipe

connected to the

tailrace

b)Turbine pit liner

Inside diameter mm 7039

Material of construction and

conforming standard

- IS 2062 Gr. B /

Equivalent

Material thickness mm 10

Elevation of

highest point mm During detailed

engg.

lowest point mm EL 1332.27 m

8. Guide bearing

Type - Segmented - Self

Pump

No. of pads No.s 8

Diameter mm 790

Height mm ~225 Pad height

Material of bearing pads and

conforming standard

Babitted Metal,

ASTM B23Alloy 2 lining on

S235 JRG2/

Equivalent

Type, number and location of:

a) Embedded temperature

detectors4

b) Dial type thermometer2

c) Thermostats 2

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Cooling arrangementExternal Oil

Cooler

No. of coolersNos 1

Maximum safe working pressureKg/cm2 ~6

Material of construction and

conforming standard- During detailed

engg.

Cooling water requirementlpm ~103

8.1 Maximum temperature rise abovecooling medium, measured by

embedded temperature detectors

at maximum continuous rated

operation

oC During detailed

Engineering

at most unfavourable operating

conditions as specified

oC During detailed

Engineering

8.2 Losses in the bearing at rated

operating conditions

kW 15 to 20

8.3 Oil specification grade and make - ISO VG46,

Reputed

8.4 Capability to withstand for

runaway speed with cooling water Min.15

rated speed without cooling water Min.15

runaway speed without cooling water Min 2

8.5 Capacity of bearing oil reservoir L During detailed

Engineering

9. Servomotors(deflector)

9.1 Number of servomotors Nos. 6

9.2 Full stroke mm ~130

9.3 Bore of cylinders mm ~125

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9.4 Active volume cm3 ~1600 per

servomotor

9.5 Maximum operating pressure bar

Kg/cm2120

9.6 Minimum operating pressure bar

Kg/cm280

9.7 Max. operating energy per

servomotor

kNm 97.2-Open

115.2-Close

Approx

9.8 Min. operating energy per

servomotor

kNm 64.8-Open

76.8-Close

Approx

9.9 Material of cylinder and piston and

Conforming standard

During detailed

Engineering

9.10 Arrangement details of Lock at

servomotor

During detailed

Engineering

9.11 Type of installation Mounted onNozzle

10. Servomotor (Nozzle)

10.1 Number of servomotors Nos. As per nozzle Internal

servomotor

10.2 Full stroke mm ~165

10.3 Bore of cylinders mm ~170

10.4 Active volume cm3 ~3600 per

servomotor

10.5 Maximum operating pressure Kg/cm2 120

10.6 Minimum operating pressure Kg/cm2 80

10.7 Max. operating energy per

servomotor

kNm 216-Open

259.2-Close

Approx

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10.8 Min. operating energy per

servomotor

kNm 144-Open

172.8-Close

Approx

10.9 Arrangement for selection of 3/4/5/6

jet operation

Yes/No Yes Shall be decided

for optimum

performance.

10.10 Material of cylinder and piston and

Conforming standard

During detailed

Engineering

10.11 Type of installation Inside the nozzle.

11. Load on thrust bearing

i) Due to turbine rotating parts Tonnes ~15

ii) Due to maximum hydraulic thrust Tonnes

a) under 3 jet operation Tonnes 1.5

b) under 4 jet operation Tonnes 2.0

c) under 5 jet operation Tonnes 2.5

d) under 6 jet operation Tonnes 3.0

12. Maximum unbalanced hydraulic

thrust during worst operating

condition(specify condition also)

Tonnes 3.4, Transient

condition

13. Turbine discharge flow-meter

i) Type Ultrasonic

ii) Make During detailed

engg.

iii) Range of flow measurement m3 /sec 0-20

iv) Accuracy % 2 to 3

14. Centralised grease lubrication system

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i) Capacity & Rating of equipment n/a

ii) Rating of pump kW n/a

iii) Type and make of pump & C.G.L

system

n/a

iv) Capacity of grease reservoir n/a

15. Lubricating Oil

i) Grade & conforming standard ISO VG46

ii) Make IOC/Casrtol/Mob

il /Reputed

iii) Equivalent -

iv) Quantity L During Detailed

Engineering

16. Inspection Platform Runner

a) Elevation m. During Detailed

Engineering

b) Material Structural Plate

Steel

(Galvanized)

17. Hydraulic Elevator and Trolley for

Runner

Please refer S no 3

also.

i) Make and type As per Voith

design

ii) Lift m During Detailed

Engineering

iii) Height of Runner and Trolley mm During Detailed

Engineering

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18. Instrumentation

(Following details for each type ofinstrument to be furnished)

Please refer

Control systemGTP

a) Make

b) Details of sensor

i) Make & type

ii) Principle of operation

d) Details of Indicatinginstrument/Controller

i) Make & type

ii) Analogue or Digital or LED

iii) Level switches for control

iv)Auxiliary Level Switch for

alarm

v) Output for Data acquisition

system

vi)Input voltage

Volt

vii) Special cables

Type

No. of cores Nos.

Size mm

Screening

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e) Vibration detector

i) Make

ii) Type

iii) Locations

B&K/Mc-

monitoring

Proximity sensor

Bearing

19 Time taken

i) To load the unit from zero

to rated output

ii) To reach runaway speed

from normal speed in case

of failure of governing

system

Sec.

Sec.

During Detailed

Engineering

During Detailed

Engineering

20. Weights

20.1 Total weight of complete turbine

a) Stationary parts

b) Rotating parts

Kg

Kg

During DetailedEngineering

~ 15000

20.2 Heaviest pieces for erection

distributor Kg ~10000

Distribution pipe

segment

21. Dimensions

21.1 Maximum diameter, length and

designation of turbine part to be

removed through generator stator

bore.

mm ~Dia. 1700

Bearing Outer

Hoursing

21.2 Minimum distance between

centrelines of adjacent units

mm ~14700

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21.3 Recommended setting elevation m 1337.90

2.2.1. Specification of Material of Turbine

Sl. No. Component Material &

Composition

Conforming

Standards

1. Spiral Distributor S355 J2G3

/Equivalent

DIN EN 10025-3

/Equivalent

2. Runner X3CrNiMo13-4

/Equivalent +

GX4CrNiMo13-

4/Equivalent

EN 10250 /Equivalent

+ EN

10283/Equivalent

3. Nozzle Tip Insert X3CrNiMo13-4

/Equivalent


4. Needles X3CrNiMo13-4

/Equivalent


5. Jet Deflector G - X 4 CrNi 13 4

/Equivalent

DIN EN 10283

/Equivalent

6. Servomotor Outsourced from

reputed make

-

7. Shaft Grade D ASTM A 668

8. Linkages (for deflector kinematics) X3CrNiMo13-4

/Equivalent


9. Pit Liner Structural Plate Steel IS 2062 Gr.B /

Equivalent

10. Bearing metal for guide bearing pads White metal lining on

Carbon steel

ASTM B23 - alloy2

lined on C10E

/Equivalent

11. Coolers

TubeTube plates

Cu-Ni 90/10 ASTM

3111 C706

ASTM/Equi

12. Any other item not given above

2.3. Recommended additional spare parts

List hereunder the spare parts which are recommended by the Bidder for purchase in

addition to the specified spare parts. The purchase of any or all of the recommended

spare parts will be at the option of HPPCL. The prices for recommended additional

spare parts for five (5) years shall therefore not be included in the bid prices.

ITEM DESCRIPTION UNIT PRICE/ UNIT

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Note : Use additional sheet, if required

2.4. Information to be supplied together with the bid

At least the information listed hereunder shall be given by the Bidder. The Bidder

may support advantages in his design or of special technical features of his offer by

additional documents / descriptions

1. Compute pressure rise at turbine inlet under the most unfavourable conditions

(load acceptance and rejection) as requested in Technical specification.

Conditions considered as well as governor acting times to be clearly indicated in

the computations.

[Voith Reply:] See attached preliminary Transient Calculation report as

attached in bid section. 2.4.1

2. Compute turbine speed rise under conditions as above and for following load

rejection parameters.

from 110 % rated output to zero





[Voith Reply:] Detailed calculation report shall be submitted during

detailed engineering.

3. Expected flow characteristics during closing and opening of nozzles as function

of time.

[Voith Reply:] Shall be submitted during detailed engineering.

4. Expected performance curves for the maximum, rated and minimum net heads.

The curves shall also show the overload output at maximum possible nozzle

opening extending beyond the guarantee points.

[Voith Reply:] Shall be submitted during detailed engineering.

5. Provide dimensional drawing (cross section) of turbine and associated equipment

showing main dimensions.

[Voith Reply:] Please refer power unit cross section drawing attached.

6. Describe proposed shaft seal systems, preferably illustrated by schematic

diagram.

[Voith Reply:] Not applicable being Pelton turbine.

7. Applicable method and type of vibration monitoring system.

[Voith Reply:] Please refer Monitoring system write up bid clause 9.1.4.8

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8. Provide information on model or field performance tests performed on a turbine

which is hydraulically similar to the proposed turbine. Indicate at least the

following:

place of model or field testsyear of model or field tests

designed rated turbine output

rated net head

rated speed

efficiency achieved

[Voith Reply:] Shall be informed during detailed engineering.

10. Calculation sheet for dimensions of turbine, generator and power house.

[Voith Reply:] Refer power house drawing for dimensions. Calculation sheet

shall be discussed during detailed engineering.

11. Calculation sheet of various heads like, rated net head, maximum net head and

minimum net head.

[Voith Reply:] Net head values given by the employer has been followed.

12. Drawings of cross-section of machine including turbine and complete power

house.

[Voith Reply:] Attached with Bid.

Complete details of tools in accordance of technical specifications.

[Voith Reply:] Please refer the scope of supply list.

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