r

The Opercatin Mllllual of2MCL458 Compressor 100.489H 489 SY 2/85

Content Index ............................... ................... .......... ......... .... ........... ... ......... .. ............ ......... ............................ ....... .... 4 I. Sum mary ...................... .......................... .............. ......... ...... ..................... .. .. ....... ............. ..... ............... 7

1. 1 General lnstruction .. . .. .. . . . .. . . . . . . . . . ... .. ... .. .. . .. . . . . ..... .. .. .. .. .. . .. . . . .. .. . . . .. .. .. ... . . . .. .. . . ... . . ... . . . . . .. . . . .. . . . ... 7 I .2 The main datas of compressor train . .. . . . .. . .. . . . . .. .... . . . . . .. . . . .. .. . . . . . . .. . . .. .... . .. . .. .. .. .. .. .. .. .. . .. .. .. .... . .. . . . 8

2. Description of the structure of the proper of centrifugal compressor ......................................... I 0 ' 2. I Symbology of the compressor. ................ .................................................. ...... ....................... 1 0

2.2 Stator and Its components .................................... .. .............................. .................... ..... .......... I 0 2.3 Rotor and its components .............................. ................................ ... ........ ... .... .............. .... ..... . l2 2.4 Journal bearing ............................ .............................. ....................................................... .. ..... 14 2.5 Thrust bearing ....................... .. : ...................................................................... ......................... 15 2. 6 Shaft end sealing .. ...................................................................................... ...................... ........ 16 2.7 Coupling ................... ... ....... ...... .... ........................................................................................... 16 2.8 Coupling guards ......... .. ......................... ............. .... ................. ........... .... .... .... ... ... .. ... ..... .......... 16 2.9 Baseplate of compressor ............................. ...... ... ........................................... ... .......... ............ 17 2. I 0 Shaft monitoring ................ .... ..... ............. ........................................ ..... ....... ....... ..................... 17

3. Erection of centrifugal compressor .. .... ... ........................... .............................................................. 18 3. I Base of centrifugal compressor .................................. .................................................... ......... 18 3.2 lnstalling and aligning of compressor unit ..... ... ...... .................. ............ ................................. 18 3.3 Aligning and joining of compressor ..................................................... .. ............................... 21

4. Operation of cent rifugal compressor .................... ......................... .. ........................................... .. .34 4. I Pre-measurement prior to starting..... ................. .......... ........................................... .. . .. . . . 34 4.2 Starting ............................................ ............... .... ... .. ........... .. ............ ............ ... ........ ............ ..... 35 4.3 Monitoring during operation .................................................................................................. 36 4.4 Shut down normally .......................... ..... ............................................................................ .39 4.5 Abnormal shut down (trip shut down) .............................................................................. .40

.

4.6 Tn)ub!e a'1alysis a'ld removal during operation ............... ........ ....... ...................................... .40 4. 7 Preparation before long-term operation ............. .. .... ........................ ... .................. .. ............ .43 4.8 Maintenance during the compressor shut down................................................ . ............. 43

5. Maintena nce of centrifugal compressor ........... ................................................................... .. ....... 46 5. 1 Maintenance instruction .................................................................................. .. . ............. .. .46 5.2 Inpscetion list. .. ... ........ ............. ................................................................................... ......... 46 5.3 Trouble shooting during compressor running. .. ..... ... .............. ....... ................ . .... 49 5.4 Important point of maintenance ............. .... .... ........ ....... .. .. .. ...... ...... ... ..................... ..... ... 50 5.5 Assembly ............................................................... ..... ..................................... ....... . ...... .58 5.6 Assembly and Disassembly of Adjustment Device and Instrumentation of Compressor .... 59 5. 7 Protection Measure of Compressor Transportation .. ........................................ .............. .... 60 5. 8 Dry gas seal (refer to instruction of dry gas seal) .. .. . .. . .. .. . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . .. . .. . .. . 61

6. Spare parts of the compressor t r.t in ........... ... ...... .... ........................................................ . 62

.. .

6.1 The order of spare parts ................. ...................................................................... ....... .' 6: The long-tcnn storage of spare parts ..... The J~rous spare parts! .. . ..

Lube o il un it .....

. . . . 6:2

7. 1 - ., '-- .. I J

7 4 7 5

Thi! Operearin Manual of 2MCL458 Compn:ssor 100489H 489$Y 3/ 85

Pwpose of lube otl urut: ..................................... ..... ............................ ... ... ........... ...... 63 \!fake up of lube oil urut ............................................................................................... 63 Structure feature and operation of main parts.... . ... ......... ... . .. .. ...... ...... .... ..... .... . ... 63 Startup of the lube otl unit................ ................ ....... ... ................... ... ... ... .... ...... . .... 67 Set value .. . ...................... ............................... ............. ......................................... ........... 68

7 6 Character of lube oil ............ .................................... .................................... .... ....... ... ..... ...... 68 8. Gear Box ..... . .. .............. ........ ................... .................... ................ .......................... ......... ~ .... 69

8.1 Servtce ................................ .. ... .. ........ ....... ... ........ .. .............................. .......................... ~ ........ 69 8.2 Structure ......... .. .............. ............. .. ............. ........................ ......................... .. .. ............. .......... 69 8 3 (nstallation, alignmg and running test of gearbox ......................... ... .. ..... .................... .. .......... 70 8 4 Operation ............... .......... ...... ...... .. ... ..... ............................................................................. 72 8.5 Maintenance ................................. : ..................................... ........ ........ ... ........... ... .................. 76

9. Controls and Instruments ............................ ....... ... ...... ... ........ ........... .... ...................... ... ............... 79 9 I Gas path system .. .. .. . . .. .. ... .. ... .. .. .. . .. . ...... .. .. .. .. .. . .... .. . . ... . .. ... .. ..... .. . . .. . . . ....................... 79 92 Lube oil system .. ................................................ ..... ...... ....... ...... .. ... . ... ... . .......... 83

8.

7.1 - ? I-..,.., I ,J

7 4 75

Th.: Opereatin Manual of 2MCL458 Compressor 100.489H 489 SY 3/ 85

Purpose oflube oil unit: .... ................ ....... ...... ....... ......... .. ..................................................... 63 Make up of lube oil unit: .............. ................................. .... .................... ............................... 63 Structure feature and operation of main parts: ................. ............................ ........................... 63 Startup of the lube otl unit .................................................................................. .. ................. 6 7 Set value ..... ...... ..... .......... .. ... ..... ....... ....... .. ... .. .... ......... ... ....... ................................................ 68

7.6 Character of lube oil ........... ........ ........... ... .. .... .......... .............. ........ ... ..................................... 68

. ' GearBox .......................................................... .... .... ..... .... .. ............................................ ........ ... ... .... . 69 8.1 Servtce ..................... ............... ... ....... ............ .. ...... ..... ... .. .... ............ ..... ... .. .... .. ....... ......... ~, ...... 69 8.2 Structure .... ....... ............... .... ....... ........... .... ....... .... .... .......... ......... .. ............. .. .......... .................. 69 8.3 Installation, aligning and running test of gearbox .. ..... ...................... ..................................... . 70 8.4 Operation ........................... .. .... .. .. ...... ......................... ............................................................ 72 8.5 Maintenance .......... ..... ..... ... ........ .. .-.... .. .. ..... ... ....... .. ...... .... ........... ... .......................................... 76

9. Controls and Instruments .. .............. ................ .. ............................................................................ .. 79 9.1 Gas path system .................... .. .. ... ... ....... ..... .. ................ .... ...... .. .............................................. 79 9.2 Lube oil system .............................. .... .................................... .. ........... .. .............................. 83

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Thl! Opereatin Manual of2MCL458 Compressor 100.489H 489 SY 3/ 85

7.1 Purpose oflube oil unit: ................................................... ....... ......... .... ... ................................ 63 7 2 Make up oflube oil unit: .. .. ......................................................................... .................... 63 7 J Structure feature and operation of main parts: ........................................................................ 63 7 ..J Startup of the lube otl unit.. .............................. ..................................................................... 67 7 5 Set value ..... .... .. ... .. ... ..... ... ..... ........................................ .. .. ........... ..... .......... ............................ 68 7.6 Characteroflube oil ...................... ........ ... ................ ........ ................................................ ... ... 68

8. '

Gear Box ................................................. ...... ... ... .... ........ ........ .. ........... ....................... ...... ........... .... . 69 8.1 Service ............... ... ... ............. ..... ........ ................... ................................................. ......... ~ ....... 69 8.2 Structure ....... .............................. ........... ........... ... ....... .............. ................................................ 69 8.3 Installation, aligning and running test of gearbox ................................................................... 70 8.4 Operation ............................... ...................................................... ........................................... 72 8.5 Maintenance ................................. : ............... .............. ............................................. ................. 76

9. Controls and Instruments ................................ .... ....... ..... .............................................................. .. 79 9.1 Gas path system ...................................................................................................................... 79 9.2 Lube oil system ................................................................................... ... ............. .................... 83

,.

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The Opcreatin Manunl of2MCL458 Compressor 100.489H 489 SY 4 / 85

Index

This operation manual helps those technicians to know more about the 2MtL series ,.,

centrifugal compressor system.

This operation manual include important documents help you to use this machine safely,

properly and economically. And it also helps you to avoid damage to the machine, save

your maintenance job and improve the safety and operation life. Wben the machine is running, this operation manual cannot take place of the site trairung

.

from the operator. We can provide such training separately if customer feels necessary.

Responsibility: We will not responsible for the damage due to fault operation and impro

treating.

Note: This compressor is not allowed to work beyond the operation range that is listed in

the data sheet. We will not be responsible for the damage caused by overload (too big flo rate) or under load (pulse). Attention: The operation point listed in the data sheet is the design point of this machine.

the operation point needs to be changed, must get the confirmation from SBW before the

startup of the machine. The inlet pressure may vary I 0% in a short period. It may happen

during startup and shutdown procedure.

This operation manual shall be kept for easy availability at site.

Before operate this machine, the operator must read this operation manual careful!~ . Onl.

aft.::r get the necessary training of the mach me, can he operate this mach me.

SB W can provide you a strong and fast after sales service team. For further information,

please ~ontact our local agency or directly contact us. When you need spare parts, please mention our product code (H445)in your purchase order.

The Opereatin Manual of 2MCL458 Compressor 100.489H 489 SY 4 / 85

Index

This operation manual helps those technicians to know more about the 2MCL.series

centrifugal compressor system.

This operation manual include important documents help you to use this machine safely,

properly and economically. And it also helps you to avoid damage to the machine, save

your maintenance job and improve the safety and operation life. When the machine is running, this operation manual cannot take place of the site trainin~

from the operator. We can provide such training separately if customer feels necessary . ..

Responsibility: We will not responsible for the damage due to fault operation and impn

treating.

Note: This compressor is not allowed to work beyond the operation range that is listed

the data sheet. We will not be responsible for the damage caused by overload (too big fl1 rate) or under load (pulse). Attention: The operation point listed in the data sheet is the design point of this machin

the operation point needs to be changed, must get the confirmation from SBW before th

startup of the machine. The inlet pressure may vary l 0% in a short period. It may happe

during startup and shutdown procedure.

This operation manual shall be kept for easy availability at site.

Before operate this machine, the operator must read this operation manual carefully. Or.

Tite Opereatin Manual of2MCL458 Compressor 100.489H 489 SY 6 / 85

1.13 Protection device and manual shall be provided as per standard.

1.14 Fire detection and distinguisher device shall be provided as per standard.

2.15 The operator must be informed about the position of fire distinguisher and usage.

3 Personnel qualification and training.

3.1 Only those qualified personnel are allowed to operate the turbo blower.

3.2 Responsibility of operation, assembly, maintains should be clearly set.

4 Precautions:

4. 1 When the machine is running, it is not allowed to remove those protection devices,

which is contact with rotation part.

4.1 If the leakage is there during running, there should be necessary measure especially for

dangerous gas .

..J..3 Only when the machine is fully stopped can the repair and maintenance job be done. 4.4 Before start the repair and maintain job, if the compressed medium is dangerous to

hwnan being, it should be removed first.

..J..5 After the repair and maintain job, all the protection device shouJd be installed back. Note: For those whole package units, to prevent the movement of rotor during the

transportation, some copper sheets have been inserted to the bearing gap during packing.

After the installation, those sheet coppers should be removed before startup.

The Opereaon Manual of 2MCL458 Compressor 100.489H 489 SY 7/85

1. Sum~ary

1. l General Instruction

This compressor is used as the nature gas compressor for 80MW Gas turbine of Tongi

Power Plant, Bangladesh, the model of which is 2MCL458. The Motor is adopted to

drive this compressor through the gearbox and the diaphragm coupling. The motor and

gearbox are installed on the common base plate, so that this is convenient for

installation and centering. The lube oil for compressor, motor and gearbox will be

supplied by the common lube oil system.

The diagrammatic layout of the compressor train as the follo~ng:

- II ..... Ul ::I c+ ~ ~ Q) ::t

The Operentin Mnnual of 2MCL458 Compressor 100.489H 489 SY 8 / 85

1.2 The main datas of compressor train

1.2. l The Performance parameters of compressor

Normal A B

' Medium Methane gas Methane gas Methane gas ~.

Average molecular weight 17.248 16.182 16.182

Flow rateNm3/H 36000 33100 36000

Inlet press. bar (G) 3.7868 3.7868 3.7868 . Inlet Temp. c 35 35 35

Outlet Press. bar (G) 27.1 25.647 21.19 Outlet temp. c 134.8 134.8 134.8

Shaft power K W 3218 2889 2853

Speed r/min 12474 12474 12474

1.2.2 Outline dimension, parameter and weight _ Model 2MCL458

Stage

Inlet tlange dimension

Press. MPa(AJ Facing type

Directiov

Outlet flange dimension

Press. MPa(A) Facing type

Direction

I Stage Og400 4.0

Butt-welding forging

s tee 1 flange

upward Dg300 4.0

Butt-welding forging

steel flange

II Stage Dg300 4.0

Butt-welding forging

steeL flange

lpward Dg250 -4. 0

Butt-weld!ng forging

steel r langt:

The Operentin Manual of 2MClA58 Compressor I 00.489H 4l!9 SY 9 / 85

The whole train outline dimension (including motor):

LXWXH: 6820X2800X2950 Critical speeds:

' F irsi Critical speed: 4334.7 r/min ~.

Second Critical speed: 15561 r/min

Rotor Weight: 470 kg

Max. weight of the hoisting part: 8000 kg

Compressor Body Weight: 12800 kg

Total weight of compressor train -33000 kg

1.2.3 Driving method

Flexible coupling is adopted between motor & gearbox and gearbox & compressor.

1.2. 4 Main driver: Motor

Type: Explosion-isolation

Model: YAKS710-2WTH

Rated speed: 2985 r/min

Output shaft power (rated): 3600 kw

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The Opereatin Manual of 2MCU58 Compressor 100.489H 489 SY 10 I 85

2. Description of the structure of the proper of centrifugal compressor

Model 2MCL compressor is of multi-stage centrifugal compressor with horizontally

splltted casmg. The compressor consists of stator (casing, diagphrims, seals. and seals for balance disc), rotor (main shaft, impellers, sleeves, balance disc, shaft sleeve. half coupling), JOurnal bearings and thrust bearings.

2 1 Symbology of the compressor

Model 2MCL compressor, means there are two stages within one casing, and the gas

wtuch from first stage goes into the second stage through inter-cooler and to the

discharge status, finally reached to its fmal pressure. The impellers of two stages are

back-to-back layout.

2.2 Stator and fts components

2.1.1. Casmg

According to the requirement of different pressure and medium compressed, the casing

of a Model 2MCL centrifugal compressor can be constructed in use of fabricated steel,

iron casting and steel casting.

Based on the regulation of the contract and technical specification tabncatied casing ts

adopted for this specific compressor.

The upper and lower halves of the horizontally spLitted casing are tightened in use af

bolts and the central splitted surface of the casing is high procisely machined for

supetior tightness. and sealing glue is applied on the surface for ensuring even better

tightness at assembly of the casing.

There ts one screw hole for guide pole at each one of the 4 comers at the splined

surface of lower half casmg and a ring is set on each pole whtch acts as a guide during

assembly and disassembly of upper casing, for ensuring the r?tor and seal inside casing

not being damaged when working on the upper casing. These 4 guide poles are also

used as screw bolts tor tightening the upper and lower casmgs. 4 legs are protruded

from the two sides of the central splitted surface of the lower casing to support the

compressor on Its baseplate.

Thcrt: ..1r-:! normaih -+ .... uppun k~s bcnc:Hh ht: .::1sing ane rhcr-: ..tre t'v\U landscape

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The Opereatin Manual of 2MCL458 Compressor 100.489H 489 SY II I 85

oriented keyways on two of the legs, which are used for axially positioning of a

compressor. For the 2MCL compressor, there are two vertical keys at outsides of inlet

and outlet franges for laterally positioning the compressor. The position displacement

of the casing can be eliminated by using these keys for keeping good alignmen of the

compressor train and can also be suitable of the deformation caused by the tbf;rrnal

expansion of the casing due to temperature variation.

The bearing case and lower casing are integral piece for increasing the rigidity of the

casing. Bearing case and sealing chamber are seperated with labyrinth seals and oil

seals. The upper bearing case is removable.

Therefor, it is possible to inspect the bearing by dismounting the upper case only,

without disassembly of the compressor casing. The inlet and outlet nozzles of the

compressor are welded on the upper casing and upward oriented.

2.2.2. Diaphragm

Normally, the grey cast iron, nodular cast iron, and fabricated steel plate are used for

the diaphragms of the 2MCL compressor. Grey cast iron is used for this specific

compressor.

The function of the diaphragms is to separate each stages of the compressor and to

create a continuous flow chaiUlel through enclosure of each impeller. The contigeous

plain of the diaphragm constitutes the passage of diffuser and the kinetic energy of the

gas from the impeller is converted into pressure energy via diffuser. The inner side of

t:..'te diaphragm is return channel (swiri chamber). The gas turns to the entry of the next stage impeller through the return channel. There is a group of guide vanes at inner side

of the return channel for guiding the gas evenly flowing into the entry of next stage

impeller.

The diaphragms are horizontally splittted into upper and lower two halves. The casing

and diaphragms are fitted with rabbets and the diaphragms of each stage are inserted

onto the casing against the rabbets one by one. The upper diaphragms are fixed onto the

up'Pslightly moved around the central line. whil~ the lm'

The Opereatin Manual of 2MCL458 Compressor 100.489H 489 SY 12 I 85

horizontally splitted surface of the diaphragms is slightly lower then the central splitted

surface of the casing.

2.2.3. Seals among stages

The labyrinth seals are used among the stages of2MCL compressor. The labyrinfP. seals

are mounted at exterior edges of suction rings of each stage impeller of the compressor

for reducing the return flow of each stage. Normally the labyrinth seals are made of

aluminium alloy that is of soft material for avoiding .the shaft sleeves and impellers

being damaged.

In order to avoid the deformation of the seals due to the thermal expansion and so as to

create incident of shaft clasping, normally a "L'' type clip step is formed for the seals.

The teeth of the seal like the comb teeth. The upper parts of the exterior rings of the

seals are fixed onto the upper diaphragm or casing in use of counter sunk bolts, but not

completely fixed ,and the lower halves of the exterior ring are freely mounted onto

the lower diaphragms or casing.

The seals in larger size may cut into halves and there must be gaps between segments

for meeting the requirement of thermal expansion.

2.2.4. Seals for balance disc

Normally there will be labyrinth seals at the balance disc of a compressor for reducing

the gas leakage at both side of the balance disc. The structure of this seal is somehow

similar to the ones of inter stage.

2.3 Rotor and its components

The rotor of a compressor consists of main shaft, impeller, shaft sleeve, shaft srew nut,

sleeve, balance disc and thrust disc etc.

2.3.1. Main shaft

The major function of the main shaft of the compressor is to transferthe power and the main shaft must have certain vidigity and strengh.

=

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TI1e Oj>~..'Teatin Manual of2MCL458 Compressor 100.489H 489 SY 13 I 85

2.3.2. Impeller

Normally the impeller used in this compressor is of closed type and back ward vanes.

There must be interference between impeller and shaft and the impellers shall be hot-

shrunk on the shaft. For the wider impellers such as three-dimensional impellers, the ;\

plate disc, shroud and bades are welded into an integral piece. For the impeller with

normal width the blades are usually milled out from the plate disc and then the shroud

will be welded on afterward. For the narrow impeller, when it becomes very difficult to

stretch the fillet for welding at seams between bending blades and shroud, the blades

may be milled out on the shroud. It is relatively easier to weld blades onto the plain

shroud. For more narrow impellers the groove welding teclmique is adopted.

Over speed test shall be implemented for all impellers as per the stipulation of API 617.

2.3.3. Sleeves

The sleeves are hot-shrunk on the shaft to fix the impellers at suitable position and to

protect the unshielded portion of shaft beyond the impellers for avoiding the shaft from

exposure to the gas, and it can also actuate for diversion.

1.3.4. Shaft screw nut

Its main function is for positioning the impellers and shaft end seals.

2.3.5. Balance disc

Due to the pressure difference created by gas at shroud and plate disc of an impeller,

) the rotor of the ~ompressor is acted by the thrust force which is generated towards the entry of the impeller, and certain portion of the thrust force will be counter balanced by

the balance disc.

For the model 2MCL compressor, the balance disc is located between the outlets of two

stages. The residue thrust force is designed to act against the thrust bearing, therefor, the

axial displacement of the rotor can be eliminated.

The Opereatin MllDual of2MCL458 Compn:ssor 100.489H 489 SY 14/85

2.3 6 Thrust disc

The impellers encounter a force which is directed to suction side once they start to

rotate; this is due to the uneven thrust caused by different pressure acting on the plate

disc and shroud. The axial thrust force acted on the impeller to push the sh~ and

impeller axial ly along the shaft Normally, the general thrust force of a com~sor direct towards the suction of the compressor. For balancing the thrust force, the balnace

disc and thrust bearing are installed. The residue thrust force after balance disc acts

on the thrust bearing through the action of balance disc. "f:he balance disc is normally

made from forgings.

2.4 Journal bearing

The bearings with el1iptic bushes or tilting pads bearings are selected for model 2MCL

compressor. For this compressor, the tilting pads bearing are selected as the journal bearing. The forced lubrication oil is supplied from the oil unit The bearings are

mounted in the bearing case at the two sides of the compressor casing. The bearing case

can be independently opened for internal inspection.

The oil flow into the shaft bushes can be controled with the degree of the openess of the

oil flow controler according to temperature of the shaft bush. The pressurized lube oil

flows into the shaft bushes for lubrication and same time ~ring away the gemerated

heat.

There are 5 bearing pads at one tilting bearing (reter to fig. for detail), which are c4ua.iiy spaced mounted in the groove oi the bearing body. The pads can nit around its

pivot by using a specially made set of screws to ensure the optrnum position when it

operates. A layor of bearing alloy has been poured on the inner surface of the bearg

pads, the beaaring made from steel forgings are seperated mto upper and lower two

halves along the horizontally splitted surface and

tightened with pin positioning bolts. A rotating

pints applied at the upper part of the bearing body

ddending the rotating of the bearing body.

proof

for

)

)

The Opcrcatin Manual of2MCL458 Compressor l00.489H 489 SY 15 /85

2.5 Thrust bearing

The Michil bearings are used in this compressor unit, for counteracting the residue

thrust force which is not completely balanced by the compressor as well as the axial

thrust force created at coupling.

The thrust bearing is mounted at the exterior of the journal bearings as per the design . ~

requirement.

Michil bearing (refer to fig.2 for detail) The Michil bearing is a

double plate anti-thrust

bearing and the bearing body

is devided to upper and

_ lower two halves. This type

bearing has two groups of

anti-thrust elements, and the

8 pads in each group are

located at both sides of the

rotating thrust disc.

Fig.2

I ,2 Tirrust s~at

4. Semi-circle fixed block

6 Seting screw

8. Screw

3. Thrust pads

5. Shim

7. Pin

The Opereatin Manual of 2MCL458 Compressor 100.489H 489 SY 16 / &5

On the back of a group of thrust elements there is a shim for adjusting the clearance of thrust bearing. A layor of bearing alloy is poured on the working surface of the thrust

pads which are equally spaced mounted on the thrust ring and positioned with seting

screws. The thrust pads may tilt around their pivots for evenly bearing the axial thrust.

Oil wedges are fonned by lube oil during operation.

On the thrust ring a rotating proof pin is clamped inside the shaft bush for defending

looseness. Above the shaft bush there is a pin that is cliped into the hole of bearing

gland to eliminate rotating of the bearing body.

2.6 Shaft end sealing

There are many types for shaft end sealing, such as t1oating ring, mechanical seal, dry

gas seal, gas extraction seal and gas charge seal etc. It will be detennined by customers

to take which sealing type. Dry gas seal is adopted for this compressor train.

2. 7 Coupling

The coupling is a unit for connecting driving shaft and driven shaft and trnasmiting

movement and torque. For centrifugal compressor application, a tooth coupling, a

membrance coupling or a laminated coupling can be used. Flexible disc couplings are

used for this specific machine train.

2.8 Coupling guards

!t is made in aluminium alloy casting and it is of a closed spark proof type. The main

function of the unit is for the safty of personnels, defending entry of foreign object and drainage of oil. Some time it can also work as a simple conjunction box for the bearing temperature sensing elements, and wiring at lower part of the guards. There wil be no

influence to the dismounting of the case for inspection.

I

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The Opereatin Manual of 2MCL458 Compressor l00.4l!9H 489 SY 17/85

2. 9 Baseplate of compressor

The baseplate of the compressor is fabricated with steel plate and its function is to

support the compressor, gear box and driving unit. The claw pedestals welded onto the

baseplate for connecting with the claws of compressor casing. These claw pedestals are

also fabricated with steel parts. For the safety of the operator the free zone, which ts

located between the baseplate frame and suction nozzle of.compressor, Is shielded with

steel sheet. As stipulated in the contract, this job shall be completed by customer. As per the regulation of the contract, the baseplate of the compressor shall be apart

from the baseplate of the driver. A common baseplate for compressor and gear box is

more facil itating the alighnment ofthe whole machine train .

2.10 Shaft monjtoring 1.1 0.1. Probe for shaft displacement

In order to monitor the axial position of compressor rotor and sound alann when it is

necessary (lf it is regulated in the contract, it may be also used for pillion and bull gear shaft of gear unit). The shaft displacement probes are installed by thrust beearing side in the compressor (gear unit) and operated based on the vertex flow principle. If the thrust bearing doesn't work or the shaft displacement becomes too much and the alann

value is exceeded, a warning alarm will be issued from the displacement probes;

furthermore, if trip value is exceeded, the driver of the compresor wil1 be automatically

shut do'"'ll .

.:;. i 0.2. Shaft vibration indicator

In order to monitor the vibration of the compressor rotor and issue out alarm whenever

necessary, total 4 vibratiob probes are installed at each casing of the compressor, two

probes at each side form an inclination of 90 def,Tfee,and operate in the principle of

vertex flow.

If the vibration of the compressor rotor is too much, and exceeds the alarming value or

even the trip value, then the warning alarm or shut down command will be issued

respectively.

-\ r later case. a ti.!nc relav ..::an be used O ensure the :.;omoressor should not be actuated . .

at short t ime peak value period so as to avoid an in