LEYBOLD RUVAC WS 251 Manuale utente

RUVAC WS/WSU

251/501/1001/2001

Roots pump with mineral oil,

synthetic oil or PFPE filling

Cat.-No.

101 83

117 22/32/42/52

117 23/33/43/53

117 27/37/47/57

117 28/38

118 33/43/53

150 44/95/96

167 007

917 48

155 000

Operating Instructions

GA 03.108/14.02

Vacuum Solutions Application Support Service LEYBOLD VACUUM

Contents

Contents Page

IMPORTANT SAFETY CONSIDERATIONS . .4

1 Description . . . . . . . . . . . . . . . . . . . . . . . . . .6

1.1 Design and function . . . . . . . . . . . . . . . . . . . .6

1.2 Standard specification . . . . . . . . . . . . . . . . . .9

1.3 Technical data . . . . . . . . . . . . . . . . . . . . . . .10

1.4 Accessories . . . . . . . . . . . . . . . . . . . . . . . . .11

2 Transportation and storage . . . . . . . . . . . .12

3 Installation and connection . . . . . . . . . . . .13

3.1 Installation . . . . . . . . . . . . . . . . . . . . . . . . . .13

3.2 Filling in of the lubricants . . . . . . . . . . . . . . .13

3.3 Electrical connections . . . . . . . . . . . . . . . . . .14

3.4 Connection of the flanges . . . . . . . . . . . . . . .16

4 Operation . . . . . . . . . . . . . . . . . . . . . . . . . .17

4.1 Start-up . . . . . . . . . . . . . . . . . . . . . . . . . . . .17

4.2 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . .17

4.3 Shutdown and storage . . . . . . . . . . . . . . . . .18

4.4 Changing from vertical to horizontal flow . . . .18

5 Maintenance . . . . . . . . . . . . . . . . . . . . . . . .19

5.1 Safety information . . . . . . . . . . . . . . . . . . . . .19

5.2 Exchanging the lubricants . . . . . . . . . . . . . . .19

5.3 Cleaning the fan cowl and the cooling fins . .20

5.4 Cleaning the dirt trap . . . . . . . . . . . . . . . . . .20

5.5 Cleaning the pumping chamber . . . . . . . . . .21

5.6 Cleaning the valve of the pressure

balance line . . . . . . . . . . . . . . . . . . . . . . . . .21

5.7 Leybold service . . . . . . . . . . . . . . . . . . . . . .22

6 Troubleshooting . . . . . . . . . . . . . . . . . . . . .23

EEC Declaration of Conformity . . . . . . . . .24

Indicates procedures that must be strictly

observed to prevent hazards to persons.

Indicates procedures that must strictly be

observed to prevent damage to, or destruc-

tion of the equipment.

Figures

The references to figures, e.g. (1/2) consist of the Fig.

No. and the Item No. in that order.

2GA 03.108/14.02 - 01/03

Warning

Caution

Contents

Leybold-Service

If a pump is returned to Leybold, indicate whether the

pump free of substances damaging to health or whether

it is contaminated.

If it is contaminated also indicate the nature of the

hazard. Leybold must return any pumps without a

„Declaration of Contamination“ to the sender’s address.

Disposal of waste oil

Under the amended law relating to waste disposal dated

November 1, 1986 (valid in the Federal Republic of Ger-

many) the disposal of used oil is subject to new provi-

sions. According to legislation relating to waste disposal

the so-called principle of causality is applied. Hence,

anyone in possession of used oil is responsible for its

proper disposal.

Used oils coming from vacuum pumps must not be

mixed with other substances.

Used oils from vacuum pumps (LH-oils on the basis of

mineral oils) having been affected by normal contamina-

tion due to oxygen from the ambient air, increases in

temperature and mechanical wear, must be disposed of

as used oil in accordance with the regulations.

Used oils from vacuum pumps that have been contami-

nated by other substances must be labelled, stored and

disposed of as special waste with reference to the kind

of contamination.

If you send a pump to LEYBOLD for repair please indi-

cate any harmful substances existing in the pump oil or

around the pump.

When disposing of used oil please observe the safety

regulations that are valid in your country.

We reserve the right to modify the design and the speci-

fied data.The illustrations are not binding.

GA 03.108/14.02 - 01/03

4GA 03.108/14.02 - 01/03

Safety considerations

IMPORTANT SAFETY CONSIDERATIONS

The Leybold RUVAC vacuum pump is designed for safe and efficient operation when used properly and

in accordance with this manual. It is the responsibility of the user to carefully read and strictly observe

all safety precautions described in this section and throughout the manual.This product must be ope-

rated and maintained by trained personnel only. Consult local, state, and national agencies regarding

specific requirements and regulations. Address any further safety, operation and/or maintenance que-

stions to your nearest Leybold Vacuum office.

Warning Failure to observe the following precautions could result in serious personal injury.

• Before beginning with any maintenance or service work on the RUVAC, disconnect

the pump from all power supplies.

• Do not operate the pump with any of the covers removed. Serious injury may result.

• If exhaust gases must be collected or contained, do not allow the exhaust line to

become pressurized.

• Make sure that the gas flow from the exhaust port is not blocked or restricted in

any way.

• The standard version of the RUVAC is not suited for operation in explosion hazard

areas. Contact us before planning to use the pump under such circumstances.

• Before starting up for the first time, the motor circuit must be equipped with a suitable

protective motor switch. Please take note of the information in these Operating

Instructions or on the electric motor (wiring diagram).

• The RUVAC is not suited for pumping of

- combustible and explosive gases or vapours

- radioactive and toxic substances

- pyrophorous substances.

• The RUVAC must be integrated in the system control arrangement so that the pump

can not run-up automatically after it has been shut down by the temperature switches

in the motor.This applies equally to emergency shut-down arrangements. After having

determined the fault cause, the pump should be switched on manually again.

• Avoid exposing any part of the human body to the vacuum.

• Never operate the RUVAC without a connected intake line or blank flange.

• The location at which the RUVAC (including its accessories) is operated should be

such that angles over 10° from the vertical are avoided.

• The location of the RUVAC should be such that all controls are easily accessible.

• Under certain ambient conditions the RUVAC may attain a temperature of over 80 °C

(176 °F).There then exists the danger of receiving burns.

Note the symbols on the pump pointing to the hazards, and in the case of a hot pump

wear the required protective clothing.

GA 03.108/14.02 - 01/03

Safety considerations

Warning • The noise level produced by the RUVAC is about 63 to 72 dB(A).

Make sure that suitable protection measures are taken to protect the hearing.

• Before pumping oxygen (or other highly reactive gases) at concentrations exceeding the

concentration in the atmosphere (> 21 % for oxygen) it will be necessary to use a special pump.

Such a pump will have to be modified and de-greased, and an inert special lubricant (like PFPE)

must be used.

• Before commissioning the RUVAC, make sure that the media which are to be pumped are

compatible with each other so as to avoid hazardous situations.

All relevant safety standards and regulations must be observed.

• It is recommended to always operate the RUVAC with a suitable exhaust line which is properly

connected.

• When moving the RUVAC always use the allowed means.

A lifting eye is provided as standard on the pump.

Caution Failure to observe the following precautions could result in damage to the pump:

• Do not allow the ingestion of small objects (screws, nuts, washers, pieces of wire, etc.)

through the inlet port. Always use the screen which is supplied with every pump.

• Do not use the pump for applications that produce abrasive or adhesive powders or

condensable vapors that can leave adhesive or high viscosity deposits. Please contact Leybold Sales

for selecting the right separator.

• Before pumping vapors, the RUVAC should have attained its operating temperature.

The pump will have attained its operating temperature about 30 minutes after starting the pump.

During this time the pump should be separated from the process, by a valve in the intake line,

for example.

• In the case of wet processes we recommend the installation of liquid separators upstream and

downstream of the pump so as to avoid a massive influx of liquid into the pump.

• The exhaust line should be laid so that it slopes down and away from the pump so as to prevent

condensate from backstreaming into the pump.

• In order to prevent the transfer of vibrations from the RUVAC to other parts of the system we

recommend the use of corrugated hoses or compensators on both the intake and the exhaust sides.

• The entry of particles and fluids must be avoided under all circumstances.

• Corrosion, deposits and cracking of oil within the pump are not allowed.

Description

6GA 03.108/14.02 - 01/03

1 Description

1.1 Design and Function

The RUVAC WS and RUVAC WSU are Roots pumps dri-

ven by a canned motor.

The WSU types have a pressure balance line between

the discharge and intake flanges.

The RUVAC WS and WSU are lubricated with mineral oil

or perfluorized polyether (PFPE) in the case of the PFPE

models. Apart from the lubricant the mineral oil and

PFPE models are identical in type.

Only the RUVAC WS/WSU PFPE can be used for pum-

ping greater than atmospheric concentrations of oxygen

or very aggressive or hazardous gases.

1.1.1 Principle of Operation

Roots pumps - also known as Roots blowers - contain in

their pump casing (1/3) two symmetrical impellers (1/4)

rotating in opposite directions. The impellers have roug-

hly the cross section of a figure „8“ and are synchronised

by a toothed gearing so that they move past each other

and the casing without contact but with a small clearan-

ce.

The principle of operation is explained in Fig. 2.

In impeller positions I and II, the volume in the intake

flange is increased. When the impellers rotate further to

position III, part of the volume is sealed off from the inta-

ke side.

In position IV, this volume is opened to the discharge

side, and gas at backing pressure (higher than the inta-

ke pressure) flows in. The inflowing gas compresses the

gas volume pumped from the intake side. As the impel-

lers rotate further, the compressed gas is ejected via the

discharge flange.

This process occurs twice per complete revolution of

each of the two impellers.

Due to the non-contacting rotation in the pumping cham-

ber, Roots pumps can be operated at high speeds (stan-

dard n = 3,000 rpm at a mains frequency of 50 Hz).Thus

a relatively high pumping speed is attained with small

pumps.

The pressure differential and compression ratio between

the intake and discharge sides are limited on Roots

pumps.If the allowable pressure differential is exceeded,

the pump overheats.

In practice, the maximum attainable pressure differential

is significant only in the rough vacuum range (p > 10

mbar), whereas for pressures in the fine vacuum range

(p < 1 mbar) the attainable compression ratio is decisive.

Fig. 2 Functional diagram of a Roots pump (vertical flow)

Key to Fig. 1

1 Intake flange

2 Pumping chamber

3 Casing

4 Impeller

5 Discharge flange

Fig. 1 Schematic cross-section of a Roots pump (vertical flow)

Description

GA 03.108/14.02 - 01/03

RUVAC pumps from the WS/WSU range have been spe-

cifically designed for operation in the rough and fine

vacuum ranges.They are thus either used in connection

with backing pumps or in closed gas cycles.The pump’s

power consumption depends not only on the pumping

chamber volume and the rotational speed of the pump,

but also on the pressure differential between the dischar-

ge and intake flanges (see Fig. 7).

1.1.2 Design

RUVAC Roots pumps can pump gas in the vertical or

horizontal direction.

Although the pumping chamber of Roots pumps is free

of sealing agents and lubricants, the two gearwheels of

the synchromesh gearing (3/1) and the bearings (3/2)

are lubricated with mineral oil or with PFPE. The gear-

wheels and bearings of the RUVAC are located in two

side chambers which also contain the oil supply.

These two side chambers are separated from the pum-

ping chamber by the impeller seals (3/3).During operati-

on of the pump, the side chambers are evacuated via the

impeller seals.

The side chambers are linked to each other by two pas-

sages (3/12). These passages are arranged so that for

either horizontal or vertical flow the pressure will be

equalised between the oil supplies.

In both side chambers there are integrated oil pumps to

ensure that the bearings and gearwheels receive suffi-

cient lubricant at all recommended speeds.

RUVACWS/WSUs are driven by a canned motor.In such

a motor, the rotor and stator coils (3/6) are separated by

a vacuum-tight can (3/7) made of non-magnetic materi-

al. The rotor runs in the vacuum on the pump’s drive

shaft (3/10); thus a shaft feedthrough to the atmosphere

is not needed.

With the standard motors, the RUVAC WS/WSUs can

run on either 50 Hz or 60 Hz power supplies.

For the permissible electrical connection data with res-

pect to these frequencies, see Section 1.3.

Fig. 3 Longitudinal section of a RUVAC WS 1001 (horizontal flow)

Key to Fig. 3

1 Gearwheels 8 Fan cowl

2 Bearings 9 Fan

3 Impeller seals 10 Drive shaft

4 Impellers 11 Centrifugal disc lubricator

5 Driven impeller shaft 12 Equalisation passage

6 Stator 13 Intake port

7 Can 14 Centrifugal disc lubricator

Description

8GA 03.108/14.02 - 01/03

Incorporated in the motor’s stator winding is a thermal

switch which turns off the pump when the motor tempe-

rature is too high.

RUVAC WS/WSUs are air-cooled.The airflow for cooling

the motor and pump is produced by a fan (3/9) with its

own drive motor under the motor’s fan cowl (3/8).

When operating the pump via a frequency

converter you must ensure that the drive

motor for the fan is connected to the mains.

1.1.3 Pressure Balance Line

The RUVAC WSU has an integrated pressure balance

line (4/1). It links the discharge and intake flanges via a

pressure balance valve.

If the pressure differential between the flanges is too

large, the valve opens (4/2). Some of the gas which has

already been pumped then flows back through the line to

the intake flange.

The valve is weight- and spring-loaded so that it works

with both vertical and horizontal flow of the pump.

As a result of this pressure balance line, no additional

devices are needed to protect the pump against exces-

sive pressure differentials.The RUVACWSU can be swit-

ched on at atmospheric pressure at the same time as a

backing pump. As a result, the pumping speed of the

pump combination is increased even at high intake pres-

sures.

1.1.4 Lubricants

RUVAC WS/WSU pumps are, as standard, prepared eit-

her for operation with mineral oil, synthetic oil or the spe-

cial lubricant perfluoropolyether PFPE).

Other types of oil (white oil, for example) upon request.

If mineral oil and PFPE come into contact

they will emulsify. That’s why the pumps

must only be run with the type of lubricant

specified for the pump. If you want to chan-

ge the type of lubricant LEYBOLD should

do the change.

In case of operation with mineral oil we recommend our

vacuum pump oil N 62 (HE-200 in the USA). In case of

operation with PFPE we recommend our NC 1/14

(HE1600 in the USA).

PFPE pumps are marked by an additional red label at

the oil-fill screw.

The Operating Instructions GA 07.009 „PFPE for Vacu-

um Pumps“ will be enclosed with any RUVAC PFPE.

Observe the handling notes for PFPE collected in these

Operating Instructions.

1.1.5 Flange Connections

The cast flanges on the pump’s body comply with DIN

2501, nominal pressure 6.

The pumps are supplied with different collar flanges:

Pumps with Cat.Nos.beginning with 117... are equipped

with ISO-K collar flanges. This standard can be applied

in all other parts of the world.

Fig. 4 Schematic diagram of a Roots pump with pressure balance line

Caution

Key to Fig. 4

1 Pressure balance line

2 Pressure balance valve

Caution

Description

GA 03.108/14.02 - 01/03

1.2 Standard Specification

RUVAC WS/WSUs are supplied for vertical flow as stan-

dard unless you specifically request horizontal flow.

Before delivery the oil has been drained out. The

quantity of mineral oil, synthetic oil or PFPE oil required

for operation has been included separately.

Pumps with Cat. Nos. beginning with 117... are supplied

with a sealing disc, a blank flange and an ISO-K collar

flange fitted with the required number of screws.

The intake flanges of all pumps contain a wire mesh dirt

trap and have been vented with nitrogen for protection

against corrosion.

Fig. 5 Dimensional drawing for the RUVAC WS/WSU

DN 1

h51)

DN1

b2DN1

b1b

a5a2a1a

a4DN

DIN 2501 DN

WS/WSU 251 65 63 ISO-K

WS/WSU 501 65 63 ISO-K

WS/WSU 501H 65 63 ISO-K

WS/WSU 1001 100 100 ISO-K

WS/WSU 1001H 100 100 ISO-K

WS/WSU 2001 150 160 ISO-K

WS/WSU 2001H 150 160 ISO-K

RUVAC WSU only DN

= ND 6 pump flange in accordance with DIN 2501

= Collar flange with gasket for connecting ISO-K standard components

697 405 365 14 212 120 250 270 210 280 230 170

745 486 450 14 239 155 307 299 229 320 271 201

887 560 520 16,5 300 180 372 352 278 370 320 246

1065 800 740 18 370 220 457 518 388 460 422 292

71)

51)

24 305 285 300 160 280 180 306 360 307

24 390 313 340 180 320 194 348 430 332

24 414 330 340 180 320 194 348 450 350

24 490 366 396 211 370 227 414 532 392

24 524 398 396 211 370 227 414 564 424

24 635 456 530 300 460 351 578 753 523

24 642 460 530 300 460 351 578 760 530

Fig. 6 Pumping speed characteristics for operation at 50 Hz

The ultimate pressure (Pult.) depends on the backing

pump used. Fig. 7 Power consumption of the RUVAC WS/WSU

Saugvermögen

Druck

Description

10 GA 03.108/14.02 - 01/03

1.3 Technical Data

(SI units)

RUVAC WS / WSU 251 501 1001 2001

Nominal pumping speed 1) m3· h-1 253 505 1000 2050

Maximum pumping speed (at a pumping

speed for the backing pump of) m3· h-1

m3· h-1 210

65 450

160 890

250 1850

630

Possible cut-in pressure (RUVAC WS at a

pumping speed for the backing pump of) mbar

m3· h-1 31

65 37

160 27

250 22

630

Leak tightness mbar · l ·s-1 1 · 10-4

Permissible ambient temperatures

(Mineral oil and PFPE) °C12 - 40 °C

Permissible voltages at the motor’s fan AC 230 V / 50/60 Hz and 265 V / 60 Hz

Maximum allowable pressure differential in

continuous operation mbar 80 80 80 50

Mains voltage at the motor, 50 Hz V200 V (-5 %) - 230 V (+10 %) / 400 V (±10 %)4)

Motor power, 50 Hz kW 1,1 2,2 4,0 7,5

Nominal speed, 50 Hz min-1 3000 3000 3000 3000

Max. permissible speed min-1 6000 6000 6000 42003)

Motor protection category IP 20 20 20 20

Lubricant filling6)

• PFPE - vertical flow

- horizontal flow

• other types of oil

- vertical flow

- horizontal flow

1.Filling5) / 2.Filling

0,6 0,55

0,5 0,45

0,65 0,6

0,5 0,45

1.Filling5) / 2.Filling

0,85 0,75

0,75 0,7

0,9 0,8

0,75 0,7

1.Filling5) / 2.Filling

1,95 1,75

1,2 1,1

2,0 1,8

1,2 1,1

1.Filling5) / 2.Filling

3,8 3,5

2,6 2,4

3,85 3,6

2,6 2,4

Weight WS / WSU kg 90 / 95 130 / 135 228 / 233 458 / 465

Collar flanges DN 63 ISO - K 63 ISO - K 100 ISO - K 160 ISO - K

Noise level 2) dB (A) < 63 < 63 < 68 < 72

Cat. Nos.

RUVAC WS 117 22 117 32 117 42 117 52

RUVAC WSU 117 23 117 33 117 43 117 53

RUVAC WS PFPE 117 27 117 37 117 47 117 57

RUVAC WSU PFPE 117 28 117 38 - -

1) as per DIN 28400 ff

2) at an operating pressure < 10-1 mbar at 1 meter distance

3) upon request also available with a speed of 6,000 rpm

4) at Kat.-Nr. 150 44 - 230/400 V ±10 %, 50/60 Hz

5) after a complete disassembly

6) authoritative, however, is the oil level at the oil-level glass, see Fig. 8 and 9

7) horizontal flow

8) Impeller, balanced

Mains voltage at the motor, 60 Hz V200 V (-5 %) - 265 V (+10 %) / 460 V (±10 %)4)

RUVAC WS ANDEROL 555 101 83 7) 150 44

155 0003)

RUVAC WSU (H)

with ACE vibration absorber -118 33 118 43 118 53

RUVAC WS 100 Hz 8) - - - 167 007

RUVAC WSU 100 Hz 8) - - - 150 96

RUVAC WS - PFPE 100 Hz 8) - - - 150 95

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