Amitwa Report
Amitwa Report
Amitwa Report
ON
I hereby, certify that the work, which is being presented in the Seminar Report, entitled
The results embodied in this report have not been submitted by me or anybody else to any
other University or Institute for the award of Degree.
AMIT KUMAR
13EJEME014
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MECHANICAL ENGINEERING DEPARTMENT
CERTIFICATE
This is to certify that the above statement made by the Student is correct to the best of our
knowledge.
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MECHANICAL ENGINEERING DEPARTMENT
ACKNOWLEDGEMENT
I express my sincere thanks to my Seminar guide, Mr. Arun Kumar dubey for guiding me
right from the inception till the successful completion of the seminar. I sincerely
acknowledge him for extending their valuable guidance, support for literature, critical
reviews of seminar and this report and above all for the moral support he provided me at all
stages of the training.
I would also like to thank the supporting staff of Mechanical department, for their help and
cooperation throughout my seminar.
Last but not the least I would like to thank all my Faculty members, friends and family
members who have helped me directly or indirectly in the completion of the project
AMIT KUMAR
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MECHANICAL ENGINEERING DEPARTMENT
ABSTRACT
The Jalgon Maharashtra site of L.D. POWER ENGINEERS located at jalgon Maharashtra.
Erection, setting, adjustment, cantering and alignment of hydro generating unit is a very
complicated and specialized job. This has to be carried by expert. The guide covers planning,
pre-erection activities erection sequence of both horizontal and vertical machine, pre-
commissioning checks, commissioning checks and tests. It also gives tolerance to be
achieved during erection and testing. The erection technologies though explained quite in
detail but as hydro machines are tailor made, the technologies may differ for a particular
machine which has to be obtained from the manufacturer.
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MECHANICAL ENGINEERING DEPARTMENT
CONTENT
Acknowledgement .................................................................................................................... 3
Abstract. ................................................................................................................................ 4
Contents.. 5
Chapter 1
ERECTION OF SHP GENERATING UNIT
1.0 INTRODUCTION
1.1 purpose.. 7
Chapter 2
CONCLUSION 43
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MECHANICAL ENGINEERING DEPARTMENT
LIST OF DIAGRAM
FIG.-1 [Goncharov] 10
FIG.-2 [Goncharov] 12
FIG.-3 [Goncharov] 20
FIG.-4 [Goncharov] 24
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MECHANICAL ENGINEERING DEPARTMENT
LIST OF TABLE
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MECHANICAL ENGINEERING DEPARTMENT
Chapter 1
1.0 INTRODUCTION
1.1 Purpose
Erection, setting, adjustment, cantering and alignment of hydro generating unit is a very
complicated and specialized job. This has to be carried by expert and experienced team of
engineers, technicians and helpers. This guide, therefore, has been prepared with intent to
provide guide lines to such team for carrying out erection testing and commissioning of
either horizontal or vertical machines upto 25 MW capacity successfully. The guide covers
planning, pre-erection activities erection sequence of both horizontal and vertical machine,
pre-commissioning checks, commissioning checks and tests. It also gives tolerance to be
achieved during erection and testing. The erection technologies though explained quite in
detail but as hydro machines are tailor made, the technologies may differ for a particular
machine which has to be obtained from the manufacturer.
1.2 Reference
3. Installation of Vertical Hydraulic Turbine Driven Generator & Reversible G/M for
Pumped Storage Installation, National Electrical Manufacturers Association (NEMA)
Guide 5.2, NEMA, 1989.
4. Hydro Power Station Generating Equipment and its Installation by A.N. Goncharov.
The entire process of erection, testing and commissioning may be divided into three main
categories: - Pre-erection activities to be completed before starting of erection of the plant. -
Erection of built in parts of the plant. - Erection of main operating components of hydro set.
2.1 Pre-erection Activities Mainly Covers following: - Preparation of a plan to carry out
erection work and sequence of different activities. - Preparation for site storage and pre
assembly of the equipment, construction of roads, accesses for delivery of plant to assembly
area. - Erection of temporary structures, living quarters necessary for carrying out site work
smoothly and speedily. - Arrangement of construction power water, compressed air for the
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MECHANICAL ENGINEERING DEPARTMENT
erection activities. - Arrangement of lighting of erection site and nearby area - Setting layout
of erection bay as shown in fig. 1.
- Ensuring delivery of equipment and materials necessary for continuity of erection work as
per charts and plan.
- Providing hoisting, handling mechanisms, tools and devices for erection as also making
arrangement of transportation of material to the site.
FIG.-1 [Goncharov]
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MECHANICAL ENGINEERING DEPARTMENT
Erection of built in Turbine Parts
Erection of these items starts as soon as the underwater concrete structure has reached the
required elevation below the lining of DT cone. At this stage permanent crane is not available
as such temporary gantry crane has to be installed whose lifting capacity, travel upward,
downward, forward and backward is decided by the size and weight of heaviest and largest
part to be handled by the crane.
- The first stage is to prepare a well coordinated over all plans for construction of civil
activities and activities related to erection of hydro mechanical items and hydro generating
units.
- The second stage is the detailed planning stage and it should include following information
concerning erection of main equipment. The amount of installation work by years according
to overall construction of the project Sequence, speed and technologies for erection activities
Requirement as regards workers, engineers, and technicians Basic material and their expected
deliveries to the site. The second stage planning consists in preparing special plan for erection
of main equipment based on overall coordinated construction plan, delivery schedule of main
plant and availability of funds.
- The technical features of main equipment, weight and size of parts and subassemblies.
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MECHANICAL ENGINEERING DEPARTMENT
- A time schedule for carrying out erection work matching with delivery schedule and civil
construction activities for each generating set and for all sets together. This should give
sequence and duration of all critical as well as parallel activities for completion of erection
work as per overall schedule.
- All relevant plan, assembly and erection drawings and details of required technologies.
Mainly two types of horizontal generating unit are used these days: A. Units with turbines
having spiral casing. B. Tubular /Bulb type units there may be other variations also but this
guide will be confined to deal with erection of these two types of hydro units.
Spiral Casing - Principal axes of the generating set are fixed by reliably secured brackets
and bench marks - The perpendicular position of each component is checked by stretching
piano wires along the principal axes.
First of all proper positioning of spiral casing is done. As this is the base part of generating
unit its correct positioning will determine the correct installation of entire generating set.
Spiral casing is normally received in two parts and assembled & positioned at site. - Lower
half is installed and adjusted on select beams embedded in concrete in advance. - Then upper
half is placed on it and secured. - Correct position relative to principal axes, elevation &
horizontal position relative to turbine cover plate and inlet flange are adjusted. A level or
plumb line is used for this. - Attention is required in matching centre lines of spiral casing
inlet and penstock. - Once the elevation is adjusted by placing steel blocks beneath its claws,
spiral casing is bolted to the supporting beams.
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Turbine Operating Mechanism
AHEC / MNRE / SHP Standards / E&M Works-Guidelines for Erection, Testing and
Commissioning 7 of Small Hydro Power Plants/May 2011 Turbine bearings
- The housing of turbine bearings should be installed together with their base plates on
properly cleaned and levelled surface of foundation.
- The transverse axes of the bearings are found by measurements from the centre line of spiral
casing and are marked on the foundation.
- The alignment of bearings and coincidence of their centre line with longitudinal axis of
generator are checked by stretching piano wire through spiral casing along the bearing centre
line centring of horizontal piano wire in spiral casing is checked by micrometers.
- The bearing housings are centred relative to the longitudinal axis of generating set with an
end gauge inserted in the bores for the bearing shells.
- After check of bearing housings, the foundation bolts are secured in their recesses so that
they are located vertically in the centres of holes in base plates and should not move during
concreting.
- The foundation bolts are then grouted - The supporting beams of spiral casing and draft
tube are also concreted, if not done earlier.
Guide Apparatus
- Insert bushings in the turbine cover plates and bolt them provisionally.
- Then this cover plate is placed in position and bolted and secured.
- The joint between cover plate and scroll casing is sealed with rubber cord
- All the guide vanes are then installed in closed position of guide apparatus - Rear cover
plate is mounted and sealed in the same way as front one, and provisionally secured with
bolts.
- The clearance between guide vane ends and turbine cover plates must be uniform on both
sides and total should be between 0.2 to 0.6 mm.
- These are checked by feeler gauges and adjusted by tightening bolts of bushing flnges.
- There should no clearance between guide vane to guide vane when closed position.
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MECHANICAL ENGINEERING DEPARTMENT
- The levers are then installed and regulating ring is installed. The levers are fixed to G.V.
pivots by dowel pins.
- The guide vanes are turned through regulating ring to fully open position and width between
each pair of vanes are measured in this position
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FIG.-3 [Goncharov]
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Cantering of stator should be done with respect to the axis of hydro set and stator level should
be kept as indicated in the drawing. Carry out laying, jointing and insulation of winding.
AHEC / MNRE / SHP Standards / E&M Works-Guidelines for Erection, Testing and
Commissioning 31 of Small Hydro Power Plants/May 2011
- Carry out full assembly of rotor in erection bay. - Carry out full assembly of upper bracket
and thrust bearing oil bath at the erection bay.
- With the help of special device the assembly of rotor with shaft shall be carried from
erection bay and lowered inside the stator bore and shall rest on the brakes. The cantering of
rotor is done primarily along the air gap. By adjusting the height of brakes, the shaft flange
level shall be adjusted as indicated in the drawing.
- Assemble thrust bearing and mount thrust bearing collar. - Assemble the guide bearings;
adjust zero gap between pad and journal
- Centre generator shaft as per turbine shaft - Transfer the weight of rotor on thrust bearing -
Check the wobbling of thrust bearing mirror disc mounted under thrust collar.
- Lift the rotor on jacks. Finally centre the stator and upper bracket as per rotor
- Carry out coupling of turbine shaft and generator shaft. - Carry out checking of shaft
alignment and its perpendicularity.
- Carry out repeat checks for air gap between stator and rotor.
- Carry out inspection and final assembly of thrust bearing and guide bearings.
- Assemble lower bracket and install it on the foundation with fixed foundation plates and
centre with reference to the axis of hydro set and along its height.
- Carry out the assembly and installation of the stator on the stator foundation with the fixed
foundation plates. Stator is cantered with respect to the axis of hydro set and is adjusted at the
design level. Carry out laying, jointing and insulation of windings.
- Carry out complete assembly of the rotor at erection bay. - Carry out assembly of upper
bracket at erection bay. - Assemble thrust bearing at erection bay and install it in the oil bath
of the lower bracket.
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- With the help of special device assembled rotor with the shaft is brought from erection bay
and lowered into the stator bore to rest on the thrust bearing. The rotor is centred
preliminarily as per the air gap. By regulating thrust bolts as well as brakes bring the shaft
flange at design level.
AHEC / MNRE / SHP Standards / E&M Works-Guidelines for Erection, Testing and
Commissioning 32 of Small Hydro Power Plants/May 2011
- Centre the generator shaft with turbine shaft. - Centre the stator with respect to rotor. -
Perform coupling of generator and turbine shafts.
- Mount the assembled upper bracket on the stator and centre it with respect to shaft.
- Assemble the guide bearing. Set zero gap between the surface of the collar and pad.
- Perform checking of the shaft alignment and wobbling of thrust bearing mirror disc.
- Finally centre the stator as per air gap and along height. - Check the cantering of lower
bracket.
- Carry out concreting of the foundation plates of stator and lower bracket.
- Perform high voltage test of the generator and testing of hydro set with load.
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Preassembly:-
FIG.-4 [Goncharov]
Preassembly of separate parts is done on a special stand equipped with jacks and provisional
bearing is shown in [FIG.-5].
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MECHANICAL ENGINEERING DEPARTMENT
Chapter 2
(i) DT Cone - Check form before installation - Check correct position in unit pit relative to
principal axes
AHEC / MNRE / SHP Standards / E&M Works-Guidelines for Erection, Testing and
Commissioning 33 of Small Hydro Power Plants/May 2011
- Check elevation
- Check elevation
- Check horizontal position relative to turbine cover plate and inlet flange - Check matching
of centre lines of spiral casing inlet and penstocks
(a) Turbine Bearing - Check foundation surface, these must have proper level - Check
transverse axes of bearing with respect to centre line of spiral casing.
- Check alignment of bearing, the centre line of bearing should coincide with longitudinal
axis of generator - Check centering of bearing housing relative to longitudinal axis of
generating set.
- Check clearance between guide vane ends and turbine cover plates. This must be uniform
on both sides and total should be between 0.2 to 0.6 mm
- Check there is no clearance between guide to guide vane when in closed position
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- Measure width between each pair of guide vane in fully open position of guide vanes
- Check guide vane servomotor for its alignment, positioning, elevation and its connection
with regulating ring and also check for proper installed of links & levers between regulating
ring and guide vanes.
(c) Runner and shaft - The centering of shaft relative to labyrinths is to be checked by end
gauge before mounting of runner.
(d) Checking and centering of rotating parts - Measure clearance between shaft and lower
bearing shell with a feeler gauge - Check horizontal position of the rotating turbine parts by
placing levels successively on both bearings. Repeat the same after turning the level through
180o. The two measurements should not be more than one scale division.
AHEC / MNRE / SHP Standards / E&M Works-Guidelines for Erection, Testing and
Commissioning 34 of Small Hydro Power Plants/May 2011
- Check radial clearances between the runner and turbine cover plates (should not exceed 2.5
to 3 mm)
- Check gaps between static and rotating labyrinths (should not exceed 0.5 to 0.6 mm)
- Check axial play of rotating turbine parts through length wise displacement of thrust bearing
to its extreme position
The gap in labyrinths seals should be 5 to 6 mm Axial clearance between thrust collar
and shell should 0.2 to 0.3 mm
- The above checks should be repeated after rotating turbine by 180o & 360o
- Check clearance between turbine shaft and upper bearing shell with 1 mm thick lead wire
of 0.3 to 0.5 mm length. The thickness of flattened wire indicates the clearance on top of
shaft.
- Check lateral clearance between shaft and lower shell. These should be one & half times
the clearance between upper shell and shaft.
(e) Governor - Check governor for its positioning, elevation, horizontal position, location
relative to turbine - The governor mechanism should be checked for
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(i) Turning of manual control should be smooth
(ii) Verify tightness of distributors when closed
(iii) Check for absence of backlash in the mechanism of regulating system
(iv) Measure maximum opening of guide vanes
(v) Verify servomotor stroke v/s guide vane opening relation should be as per design
From design and construction point of view normally following two types of horizontal
hydro generators are available.
(a) Low power hydro-generator with bearing located directly inside generator housing. Such
generators are delivered duly shop assembled on foundation frame.
(b) Large generators whose bearings are located on separate pedestals are delivered with
generator exciter and bearings assembled on common foundations.
AHEC / MNRE / SHP Standards / E&M Works-Guidelines for Erection, Testing and
Commissioning 35 of Small Hydro Power Plants/May 2011
(ii) To be assembled in erection bay Large generators are delivered in separate components
viz. shaft with generator rotor, exciter rotor assembled on it, stator frame, exciter frame and
fly wheel (in two parts). First category generators are delivered fully assembled or mounted
on rigid foundation are assembled unblocked after checking alignment and adjustment of its
elevation relative to half coupling of turbine shaft. Second category generators are
completely assembled in erection bay and then installed in unit pit. Following checks are
necessary:
- Check elevation and horizontal position by wire centered in the bores of bearing shell.
- Check centring and positioning of generator rotor and exciter rotor relative to half coupling
of turbine and half coupling of generator respectively
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2.1.3 Horizontal Tubular Generating Set
All parts forming water passage from speed ring to DT cone of this type of unit is delivered
split horizontally
Alternatively if lower halves are not to be concreted, these should be provided with strong
enough supporting structure. Horizontal tubular generating set may have a single shaft or
separate each for turbine and generator
The installation technology differs greatly depending on whether the annular parts of water
passage are concreted or not and also whether these are single shaft or separate shafts for
turbine and generator
It is preferred maximum preassembly is completed in erection bay and then lifted, carried
and lowered in the unit pit with the help of EOT crane.
1.2.1 Single Shaft Generating Unit 1.2.1.1 Checks for pre-assembly in the erection bay
Check form and dimensions annular parts of generating unit after completion of assembly
in erection bay.
Check form and dimensions of throat ring foundation ring and DT cone.
AHEC / MNRE / SHP Standards / E&M Works-Guidelines for Erection, Testing and
Commissioning 36 of Small Hydro Power Plants/May 2011
- check inner diameter, its cylinder city and concentricity Check preassembly of distributor
assembled with speed ring or on assembly stand for cylinder city, concentricity with inner
distributor ring. Also check elevation.
After assembly in pit-check for its correct positioning, elevation matching with unit axes,
its verticality concentricity and horizontality
Check generator rotor for its form and dimensions After assembly of stator, rotor and
runner
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- Check horizontality of shaft - Position of rotor and runner - Check air gaps between stator
and rotor 1.2.1.3 Assembly in pit - Before boxing up of generating unit
Check cylindricity by stretching piano wire and dropping plumb lines from transverse axis
as soon as the speed ring is lowered, centred and adjusted to its design position.
Check assembly of all other parts for proper positioning, elevation, centring and matching
with unit axes. - After boxing up
Check all parts delivered for proper form and dimensions, diameter and their horizontality
or verticality
Assembly of generator
AHEC / MNRE / SHP Standards / E&M Works-Guidelines for Erection, Testing and
Commissioning 37 of Small Hydro Power Plants/May 2011
- Check horizontality, elevation, stator rotor air gaps, bearing settings exciter gaps
After lowering of preassembled runner in pit in position following checks are done
- Horizontal position of shaft and its concentricity with speed ring - Check parallelism of
turbine shaft flange with respect to flange of speed ring. It must be within 0.1 mm.
- After lowering preassembled generator in unit pit following checks are required -
Horizontal position of generator of generator shaft - Concentricity with turbine shaft.
- Parallelity of coupling relative to turbine coupling (0.06 mm) - Alignment of generator and
turbine shaft is carried out before and after coupling
Detailed procedure is given in Annex I. The maximum permissible wobble of shaft is 0.2
mm.
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- Check gaps between stator and rotor 2.0 VERTICAL HYDRO-GENERATING UNIT 2.1
Hydro-Turbine & Accessories.
Check positioning, level, elevation of embedded pipe lines and other embedments to be
provided as per drawing
- Check form, centring, elevation of draft tube and draft tube cone.
- Check levelling and centring of speed ring foundation plates - Check centring, levelling,
elevation, axes of speed ring before and after tightening of foundation bolts.
- Check spiral casing for its form, positioning, alignment of inlet piece with penstock -
Pressure testing of spiral casing after assembly in position and anchoring
- Checking centring, levelling, elevation and setting of axes of runner chamber (in case of
Kaplan)
- Checking centring, levelling, elevation and setting of axes (in case of Francis) of static
labyrinths
AHEC / MNRE / SHP Standards / E&M Works-Guidelines for Erection, Testing and
Commissioning 38 of Small Hydro Power Plants/May 2011
- After this checking top cover can be taken out and kept in EB
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(b) Preassembly of runner and shaft
- Check shaft after thorough cleaning for dimension, check both flanges by surface plate,
check machined surface of flanges
- Check runner for its proper shape and dimensions, check labyrinths (upper & lower) in case
of Francis Runner
- Check diameter of assembled runner (Kaplan), carry out pressure testing of runner hub and
seals for leakage, check movement of servo mechanism in EB before trial assembly.
- Check clearances between rotating surfaces of runner and associated static surfaces (runner
chamber in case of Kaplan and labyrinths in case of Francis)
- Check after mounting of top cover on to turbine shaft with runner in Erection bay for its
tightening, doweling, positioning, horizontality and verticality
- Check cleaning, form and dimensions of the bearing housing - Check bedding of guide
pads by blue matching with bearing journal
SSSS - Check insulation of bearing pad - Check mounting arrangement of bearing pad
(i) Servo motors - Check servomotors for cleaning, check machined surfaces of piston and
cylinder, check seals etc.
(ii) Regulating ring - Check static portion closely - Check rotating porting closely
- Check free movement of rotating ring after assembly - Check all levers, links, bushes for
cleaning and dimensions
(iii) Guide Vanes - Check all guide vanes for dimensions machined journals and general
condition of rubber seal groove etc.
- Check all bushes (top and bottom) for dimensions machining and general conditions
AHEC / MNRE / SHP Standards / E&M Works-Guidelines for Erection, Testing and
Commissioning 39 of Small Hydro Power Plants/May 2011
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2.1.3 Assembly of Vertical Hydro-turbine in Unit Pit
- Check that top cover is tightened properly and locking pin provided - Check labyrinth
clearances (Francis) and clearance between runner & runner chamber (Kaplan)
- Check servomotor stroke between fully open & closed position of guide vanes
- Check guide bearing for proper clearance between pad & journal
- Check leakage of oil through servomotors, turbine guide bearing housing governing system
and all oil pipe lines.
- Two halves or in three sectors for bigger dial machines After carrying out stator assembly,
laying of coils in slots at joints, making over hang connection check following points: - The
stator is properly dried out
- Check circularity of inner bore - Testing of stator as per norms may be carried out to
ascertain proper winding and insulation
(ii) Lower Bracket this may also be received in single piece or two halves. After assembly
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AHEC / MNRE / SHP Standards / E&M Works-Guidelines for Erection, Testing and
Commissioning 40 of Small Hydro Power Plants/May 2011
(iii) Rotor For smaller dial machine rotor is received in fully assembled condition but for
larger diameter machine these are assembled at site in erection. But in any case poles are
assembled in erection bay.
- Check and test all the poles duly assembled before and after soldering of flexible
connections
- Check all the poles are keyed properly and wedged in slots - Check over all dimensions of
rotor
After lowering and adjusting all turbine parts the lower bracket and stator are lowered one
by one and placed on sole plates
- Check placement, unit axis, inner bore, elevation, setting on foundation plates before
concreting of foundation Rotor is lowered after centring of stator and assembly of thrust
bearing static portion with thrust bearing pads and thrust collar with mirror disc
- Check thrust bearing collar with mirror disc is properly resting on pads - Check deflection
of thrust bearing housing after total load of rotor is rested on thrust bearing pads - Check
verticality, centring, unit axes of rotor shaft.
- Check magnetic axis Coupling of Generator and Turbine Shaft: With the help of jack bolts
turbine shaft is pulled up, flanges of both shafts are properly cleaned and then coupled with
each other with coupling bolts .
- Check centring, verticality and alignment of couple shafts (Procedure is given in annexure-
II)
- Check assembly of thrust bearing & its coolers, guide bearings and their coolers - Check
assembly of brakes
- Check assembly of excitation system and AVR - Check assembly of upper and lower rotor
fans
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MECHANICAL ENGINEERING DEPARTMENT
CONCLUSION
Industrial training plays a vital role in the progress of future engineers. Not only does it
provide insights about the industry concerned, it also bridges the gap between theory and
practical knowledge. I was fortunate that I was provided with an opportunity of undergoing
industrial training at L.D. POWER ENGINEERS jalgon, Maharashtra. The experience gained
during this short period was fascinating to say the least. It was a tremendous feeling to
observe the operation of different equipments and processes. It was overwhelming for us to
notice how such a big Terminal is being monitored and operated with proper coordination to
obtain desired results. During my training I realized that in order to be a successful engineer
one needs to possess a sound theoretical base along with the acumen for effective practical
application of the theory. Thus, I hope that this industrial training serves as a stepping stone
for me in future and help me carve a niche for myself in this field.
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REFERENCE
https://en.wikipedia.org/wiki/hydrolic
Book provided by company
Material given to me by the company
Fluid mechanics by Dr. r. k. Bansal
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