catalago sapatas wauk

8/8/2019 catalago sapatas wauk

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ConTenTs

Benefts 2

General Description 3

Lubrication Systems and Sealing 5

Alternative Pad Materials & Design 6

Bearing Selection 7

Optional Features 11

Installation 17

Rotordynamic Studies 19

Size Tables 19

Size Codes 20

Enquiry Data Sheet 25

Waukesha Bearings 2002-2009

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Benefts o Tilting PadRadial Bearings:

Hydrodynamically stable athigh speed

Less sensitive to load direction

Less sensitive to shat misalignment

Oil ow can be minimised

Able to use standard components

Spares consist o pads only

Benefts o WaukeshaBearings:

The strength o a worldwidebearing group

Unique material options providethe widest range o hydrodynamicbearing solutions

Engineered designs that can becustomised or specifc needs

Complete design responsibility

Full technical support service including rotordynamics

Quality assurance approved to ISO 9001

Magnetic Bearings oer a totallydry solution

The widest range o test rigvalidation and support

Benefts o WaukeshaTilting Pad RadialBearings:

Simple design no seals required

Optimised lubrication or minimumpower loss and bearing temperature

Alignment capability to suit allrequirements

Compact designs o combinedaxial/radial bearings

Provision o static and dynamicperormance data as standard

Contract drawings provided orevery application

Optional North American rangebased on inch sizes

BenefiTs

Standard TJ Series bearings

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Fig 1 (a) TF Series Bearing Arrangement

Fig 1(b) TJ Series Bearing Arrangement

TF & TJ Series Bearings

Waukesha Tilting Pad Radial

Bearings in these series consist

o 4 or 5 pads located both

circumerentially and radially by

stop pins, and axially by end plates.

See Fig 1a and b. The stop pins

as well as locating the pads also

unction as oil supply nozzles.

Standard pads are centre pivoted

and are thereore suitable or either

direction o rotation.

Bearings are available with one piece

or split housings to comply with

machine assembly requirements.

Waukesha Tilting Pad Radial Bearings

are designed to transer radial loads

rom rotating shats with minimum

power loss and optimum dynamic

characteristics. They are available

in three main ranges:

TF series these are 4 pad

bearings or shat sizes 20-300mm.

TJ series these are 5 pad bearings

or shat sizes 20-300mm.

Large range (TFB & TJB series) -

these are 4 or 5 pad bearings or

shat sizes rom 300mm upwards.

The TF (4 pad) and TJ (5 pad)

series are designed on similar

principles and have identical outside

dimensions. The large range has some

dierent design eatures which are

described separately below.

The dimensions o these ranges

are given in the Size Tables

on Pg. 19.

geneRal desCRiPTion

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Fig 2 Defnition o Clearance Terms (Preset Ratio)

TJB400-280/2DF bearing with jacking combined with high perormance

copper chrome backed thrust pads

Large Range BearingsTFB & TJB series

For larger shat sizes it is usually

necessary to consider improved

orms o pad pivot design to

ensure high stiness combined

with ability to tilt and align;

sealing requirements also can

oten be more onerous. The

range shown in Table 4 o the

Size Tables has been ormulatedto deal with these requirements

and in particular a spherical pad

pivot is provided which combines

high stiness with good alignment

capability. Dimensions given in

Table 4 are or b/d = 0.7 bearings:

other b/d ratios can be supplied

i required.

Note that the various optional

eatures available with the Style

TF and Style TJ series are also

available in the Large Range.

Materials

Standard pads are steel backed,

lined with tin based whitemetal

(babbitt) to specifcation ISO Sn

Sb8 Cu4. Equivalent specifcations

are BS 3332/A and SAE12.

The housings and endplates are

steel or the standard bearing

arrangement. Floating seals when

used are normally manuactured

in lead bronze and knie edge end

plates in aluminium alloy.

Preset

Standard pads are supplied

with positive preset (or preload)

ratio in the range 0.35-0.55

when used with shat diameters

as recommended on Pg. 18.

The defnition o preset ratio

is shown in Fig 2.

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Fig 3 End Plate and Seal Options

luBRiCaTion sysTeMs & sealing

The standard Waukesha Tilting

Pad Radial Bearing as shown

in Fig 1(a) and (b) has the oil

ow controlled by Directed

Lubrication nozzles between

each pad with the oil exits rom

each end o the bearing being

largely ree, only large clearance

baes being provided. This

arrangement minimises power

loss and oil ow while keeping

pad temperatures low.

While the standard system

described above is ideal or

the bearing itsel, the machine

location in which it is installed

sometimes requires restriction

o the end ow rom the bearing,

either at one or both sides:

Floating seals reduce the ow

along the shat to a minimum;

i two oating seals are used,

the main ow is directed through

an orifce outlet usually at the

bottom o the bearing. Details

o the Waukesha range o

oating seals are available

on request.

Knie edge endplates, while less

eective than oating seals, oersome control o end leakage.

The our most common

combinations o seal/end plate

are shown in Fig 3 with the

identiying Style codes.

Oil supply pressure should be

between 1 and 1.5 bar though

in some circumstances pressures

down to 0.5 bar can be used.

These pressures should be

available at the oil inlet annulus

o the bearing; the bearingnozzles, orifces etc will be sized

to give the correct ow at the

specifed supply pressure.

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TJ 160-112/0 bearing with RPB25P aced pads or application with low viscosity

hydrocarbon lubricant

Whitemetal aced pads with copper

chrome backing

alTeRnaTive Pad MaTeRials

and design

Higher speeds, loads and

operating temperatures o

modern machines are

increasingly taking bearing

design beyond the limits o

whitemetal. Heat soak at

standstill can also be a problem.

Waukesha can oer the widest

choice o bearing materials

where applications exceed the

selection parameters indicated

on Pg. 7 or lubricants other

than oil are envisaged. Options

available include:

RPB25P, an engineering

polymer, especially oers

outstanding potential or high

ambient temperature

applications and water

lubrication, as well as being an

electrical insulator and resistant

to chemical attack. It can

operate at temperatures up to

120C higher than whitemetal.

Copper chrome backed pads

aced with whitemetal typically

will reduce the pad surace

temperature by 20C at higher

speeds.

Steel backed pads aced

withcopper lead can operate at

temperatures up to 40C higher

than whitemetal but require a

hardened shat surace.

Pivot PositionCentre pivoted pads are

standard as they are preerred

or bi-directional running,

oolproo assembly and

minimum spare stocks. At

higher speeds (above 60m/s)

oset pivots can oer some

bearing surace temperature

reductions and the dynamic

characteristics (stiness and

damping) may also be preerable

or some applications; allbearings can be supplied i

required with oset pivot

pads (Style OP).

Bearing with copper lead aced pads

or 50 mm shat at 60 000 min-1

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Small TJ050-035/2D bearing with Directed Lubrication or high speed

gearbox application

BeaRing seleCTion

A preliminary selection o

bearing size should be made

using the Size Tables on Pg. 19

as ollows:

1. Firstly or the shat diameter

required reer to the b/d = 0.4

Size Table and check that the

maximum load given is

adequate.

2. I the load capacity is not

adequate reer to the b/d = 0.7maximum loads and then, i

necessary, the b/d = 1.0 loads

or the required shat size.

3. I the required load capacity

is still inadequate it will be

necessary to consider using

a larger diameter bearing.

4. Waukesha would normally

propose 5 pad, TJ series,

bearings; the characteristics

o 4 pad, TF series, bearings

may be preerred or specifcapplications.

Load Capacity

The load capacity o Tilting Pad

Radial Bearings depends upon a

number o dierent actors,

principally shat speed, lubricant

viscosity and inlet temperature.

Within the speed ranges and or

the oil conditions shown in Fig

4(a), 4(b) and 4(c), the load

capacities given in the Size

Tables can be used. At speedsabove and below these ranges,

the load capacity o the

standard bearing will be

reduced and advice should be

obtained rom Waukesha.

Other actors which need to

be considered when assessing

load capacity are:

a) Direction o load the load

capacity o a tilting pad radial

bearing is aected by the

direction o the load relative tothe pad positions. In the Size

Tables the nominal load capacity

is given or the two common

orientations load on pad and

load between pads. Note that

or maximum load capacity with

a vertically downward load,

bearings can be supplied with

two pads at the bottom (Style

BP) as shown in Fig 6.

b) Load at instant o start at

this condition the specifc load*

or a TJ series bearing should

not exceed 1.4 MPa or on pad

loading or 2.2 MPa or between

pad loading. For a TF series

bearing the loading should not

exceed 2.0MPa or between

pad loading. I these loads are

exceeded the application may

need either a larger bearing (to

reduce the specifc load) or the

use o a hydrostatic (jacking)

system or use at starting and

low speed: see Pg. 13 Style J

and Fig 10.

Power Loss & Oil Flow

Power loss data or Series TJ

bearings is given in Fig 4(a),

4(b) and 4(c) or b/d = 0.4, 0.7

and 1.0 respectively. This is

based on the oil conditions

stated. Recommended oil

ows are given or a 20C

temperature rise through the

bearing. These fgures can also

be used or Series TF bearings

with standard 75 arc pads.

Pad width (mm) X shat dia (mm)

*Specifc load (MPa) =

Load (N)

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Fig 4(a) Power loss and Oil Flow. TJ series.B/D = 0.4

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Fig 4(b) Power loss and Oil Flow. TJ series.B/D = 0.7

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Fig 4(c) Power loss and Oil Flow. TJ series.B/D = 1.0

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Fig 5 Adjustable Pad Pivot Style AP

Fig 6 Two Pad Orientation Style BP

Fig 7 Curved Line Pivot Style CL

oPTional feaTuRes

Standard bearings are

available with a number o

optional eatures identifed

by Style Codes as ollows.

Adjustable Pivots.Style AP

In some cases especially on

prototype units it is desirable

to have the ability to alter the

bearing clearance: this can beachieved within standard

dimensions by having pads with

adjustable pivots see Fig 5.

Pad Arc Length.Style AR

Four pad bearings (Series TF)

and fve pad bearings (Series TJ)

are normally supplied with 75

and 60 arc pads respectively.

Series TF bearings can also be

supplied with 60 arc pads by

speciying Style AR60.

Two Pad Orientation.Style BP

This style see Fig 6 may be

required either or maximum

load capacity with a vertically

downward load (see Pg. 7)

and/or or its particular stiness

and damping characteristics.

Curved Line Pivot.

Style CL

Standard Waukesha pads have

a line pivot over hal the pad length.

While this oers signifcant ability

to deal with misalignment, in

some cases increased ability to

deal with axial misalignment is

required and the Style CL can be

used this oers a line pivot on

a curved surace. See Fig 7.

External dimensions o the

standard bearing are not aected.

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Fig 8 Temperature Sensor Installation Style IT2

Fig 9 Proximity Probe Installation Style IR

Floating Seals.Style FL

Where oil leakage along the

shat rom one or both ends

o the bearing must be kept to

a minimum, oating seals are

recommended see Pg. 5.

Temperature Sensors.

Style IT1 & IT2Bearings can be supplied

either with provision or ftting

temperature sensors (Style IT1)

or, i desired, already ftted with

sensors o Waukesha supply

(Style IT2). A typical installation

is shown in Fig 8.

Inormation required when

speciying Style IT1 is:

Sensor hole size required.

Number o sensor holes andin which pads (or Waukesha

choice).

Position in pad and at which

end (or Waukesha choice).

When speciying Style IT2,

inormation required is

similar. In addition we need

to know:

Type o sensor (RTD or

thermocouple, single or

duplex).

Electrical characteristics

or example 2 or 3 wire circuit

or RTDs, material pair or

thermocouples.

Cable length and termination

or example is a terminal head

required and i so what specif-

cation has it to meet.

Proximity Probes.Style IR

Bearings can be supplied

with provision or mounting

proximity probes on the end

plates see Fig 9. Inormation

required when speciying

this option is:

Sensor size details

o astening required.

Number and positiono probes.

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oPTional feaTuRes(ConTinued)

Fig 10 Hydrostatic jacking Style J

TJB series bearing with Flooded Lubrication or large turbo generator

TJB series bearing with hydrostatic jacking in two lower pads

Hydrostatic Jacking.Style J

Bearings can be supplied with

hydrostatic jacking in cases

where there is a high load at

the instant o start (see Pg. 7

Load Capacity). Waukesha

will speciy the required oil

supply quantity and pressure

or the hydrostatic system

when given the starting loadconditions. See Fig 10 or a

typical installation arrangement.

Knie-edge End Plates.Style KN

Where some control o the oil

leakage rom one end o thebearing is required, knie-edge

end plates may be used

see Pg. 5.

Oset Pivot Pads.Style OP

Oset pivot pads, instead o the

standard centre pivot pads, can

be supplied as outlined on Pg. 6.

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TJ250-140/0D bearing combined with high performance thrust bearing using copper chrome backed thrust pads

Axial Loads.Styles TL & TP

Bearings can be supplied with

either single or double axial aces

to accommodate axial loads

see Figs 11 and 12.

The most compact arrangement

is the Style TL with either uni-

or bi-directional taper land aces

or plain grooved aces load

capacities o these alternatives

are given in Fig 11.

To speciy these the ollowing

Style codes should be used:

Style TLG Plain grooved ace

Style TLU Taper land ace

(uni-directional)

Style TLB Taper land ace

(bi-directional)

For higher axial loads Style

TP should be used which

incorporates tilting pad aces

rom the Waukesha MS rangeas described in Designers

Handbook No 5A. The unique

system o Directed Lubrication

with centre pivot pads will

normally be used or Style TP

axial aces.

The codes TLG, TLU, TLB and

TP speciy a single axial ace: i

a double axial ace is required

a 2 sufx should be added i.e.

TLG2 etc.

I these eatures are required,

the value o the axial load atthe instant o start up as well

as during running should be

stated in the enquiry.

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Sizes and Axial Load Capacity or Style TL(or single letter dimensions see main dimension tables Pgs. 21-23)

NOTE Load capacities or taperland aces are or preliminary guidance only: they are based on the high speed

dotted line in FIG 4(a) with the same oil conditions

Fig 11 Plain/taper land Axial Faces Style TL (Assemblies with low/medium axial load capacity)

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Sizes and Axial Load Capacity or Style TP(or single letter dimensions see main dimension tables Pgs. 21-23)

NOTE Tilting pad axial bearings are rom the MS range as described in Designers Handbook 5A: see bearing selection comments or restrictions in

use o maximum load capacity.

Fig 12 Tilting Pad Axial Faces Style TP (Assemblies with high axial load capacity)

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Fig 13 Alternative Bearing Location Methods

Methods o LocationBearings are available with alternative methods o location see Fig 13.

Diametral Clearance& Shat Diameter

This range o Tilting Pad Radial Bearings

is based on a standard bearing bore or

all operating conditions; the necessary

change in diametral clearance or various

shat speeds is obtained by varying the shat

diameter. This enables standard pads or

each size to be used which simplifescustomer records and minimises inventory.

Waukeshas recommended minimum

diametral clearance at the pivots or

normal usage is shown in Fig 14. In

some circumstances clearances obtained

rom this fgure can be reduced, but it

is recommended that Waukesha be

consulted beore reductions are made.

Note: Bearing clearance ratio =

Diametral clearance over pivots

Nominal bearing boreFig 14 Minimum Diametral Clearance

BEARING CLEARANCE RATIO

insTallaTion

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Fig 15 Bearing and Shat Tolerances

The example below will show how maximum/minimum fgures can

be established or both diametral clearance and shat diameter

when Waukesha standard Tilting Pad Radial Bearings are used.

Example:

It is desired to establish the clearances and shat diameter or a

TJ050-020/2DF which has to run at 17 385 min-1 maximum speed.

(1) rom Fig 14 bearing clearance ratio or 17 385 min-1 = 0.00173

thereore minimum diametral clearance =

0.00173 X 50= 0.087mm.

(2) rom Fig 15 tolerance on diametral clearance or 50 = 0.051mm

thereore maximum diametral clearance = 0.087 +0.051

= 0.138mm.

(3) maximum shat dia = nominal size minimum dia clearance

= 50.000 0.087

= 49.913mm

(4) tolerance on shat dia rom Fig 15 or 50mm = 0.016mm

thereore minimum shat dia

= 49.913-0.016

= 49.897mm

Shat surace fnish varies with size. A typical fgure is 0.4 micron Ra

(approx. 16 microinch CLA) or a diameter o 100mm. A hardenedshat is not usually required.

Load Direction

Relative to Pads

The load capacity o a Tilting

Pad Radial Bearing is aected

by the direction o the load as

mentioned on Pg. 7. When the

load vector alls on the centre

o a pad, the maximum specifc

load recommended is approxi-

mately 2.1 MPa, and when it

alls between the pads it isapproximately 2.8 MPa. These

values are used or the

maximum loads given in the

Size Tables on Pg. 19.

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RoToRdynaMiC sTudies

Waukesha can undertake ull rotating machine studies,

including response to unbalance and stability, and

undamped natural requency. These studies utilize

bearing coefcients obtained rom in-house computer

design programmes.

This calls or an exchange o data in some detail, and

the eect o design eatures on machine stability can

oten be examined live on our computer screens.

size TaBles

Table 1: b/d = 0.4 bearings TF & TJ series 20-300mm shat dia



Table 4: b/d = 0.7 bearings TFB & TJB series 300-700mm shat dia

These tables show the sizes o the bearings which have been selected as described on Pg. 7.

When the sizes have been confrmed rom these tables, reer to Pg. 20 which shows how

the ull size code is produced by adding sufxes.

All dimensions in these tables are in millimetres unless otherwise stated.

Undamped Natural Frequency Analysis

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size Codes

Code Nomenclature

Waukesha Tilting Pad Radial Bearings are identifed by a two part code which consists

o the bearing size ollowed by a sufx indicating the type o construction.

The size designation is shown in the let-hand column o the Size Tables on Pg. 19 while

the sufx options are shown below.

In addition to the basic two part code, various additional eatures can be specifed by

reerencing an appropriate Style option rom Pg. 11. Note than in many cases the use

o the Style designation does not completely describe the eature required and additional

inormation is required.

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Orders & Enquiries

When enquiring or or ordering

Waukesha Tilting Pad Radial

Bearings rom this Handbook,

we recommend that the

anticipated operating conditions

are given so that confrmation can

be given or the bearing selection.

Please use the Data Sheet on

Pg. 25 or state the ollowing:

1. Application.

2. Shat diameter

with tolerance i

non-standard shat

to be used.

3. Shat speed normal and

maximum.

4. Load normal, maximum and

at start-up, also angle and

whether steady or rotating.

5. Oil grade to be used

also inlet temperature

and pressure at entry

to the bearing.

6. Optional eatures

I these are required,

additional inormation

may be needed as indicated

in the appropriate

Style description.

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enquiRy daTa sHeeT

foR WaukesHa TilTing Pad Radial BeaRingComplete data and send to:

E-mail: [email protected]

or, or additional contact inormation, visit: www.waukeshabearings.com

Please confrm bearing selection and give estimated operating data or the ollowing:

Name:

Company:

Contact E-mail:

Project Re:

Date:

1. General

application

4. Lubricant

type

size code or ISO viscosity grade

shat diameter or viscosity at stated temperature

quantity temperature at bearing inlet

pressure at bearing inlet

2. Radial Load

normal

5. Shat Speed

normalmax continuous

at instant o start up

max continuous

direction

overspeed

steady or rotating

6. Special Needs3. Axial Load i present

normal

max continuous

at instant o start up

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engineeRed BeaRing

soluTions

The type o bearing described

in this Handbook is one o a

complete range o shat support

products which Waukesha Bearings

manuactures or rotating

machinery (turbines, compressors,

pumps, gearboxes, motors,

generators, couplings, etc).

Some other products in the

Waukesha Bearings range:

Equalised and Unequalised Tilting

Pad Thrust Bearings.

Horizontal Bearing Assemblies,

Sel Contained and Force

Lubricated.

Vertical Bearing Assemblies, Sel

Contained and Force Lubricated.

Medium and Heavywall Fixed

Profle Journal Bearings.

Fixed Profle Thrust Washers.

Marine Thrust and Line Shat Units.

Bearings or Water and Product

Lubrication.

Active Magnetic Bearing Systems.

Spares, Repairs and Bearings to

Customer Drawings.

Note: The inormation in thisHandbook is given in good aith

but no guarantee is given or implied

in respect o such inormation.

Waukesha products are subject

to continued development and

Waukesha reserves the right to

make changes in the specifcation

and design o their products

without prior notice.

TJB400-240/2 bearing with insulation or dia 400mm shat at 3000 rev/min

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