Page 191 - Practical Machinery Management for Process Plants Major Process Equipment Maintenance and Repair

Positive Displacement and Llynarnic Blowers 173

large diameter usually on the drive side. (See on assembly draw-
ing .) If disassembly is required, observe special procedures avail-
able from the manufacturer to prevent damage to the mating sur-
faces.
3. Standard Taper-Fans with overhung wheels (Arrangements 5
through 8) often are quipped with a tapered bore which fits into a
matching taper of the shaft. Disassembly and assembly in the field
is practical, but before assembly a very thin coat of antiseize com-
pound must be evenly applied to the bore to prevent galling.
4. Taper Lock Collar-Disassembly and assembly of these collars in
the field is easy. Torquing and lubrication instructions for reassem-
bly should be found on a separate drawing furnished by the manu-
facturer of taper lock collars.
5. Shrink Fit-Wheel/shaft assemblies are shipped as one unit. Sepa-
ration is not usually possible, but could be accomplished with the
help of the manufacturer.
6. Rapid Temperature Change Assembly-This design is always as-
sembled at the factory. No field work should be done without con-
tacting the original manufacturer.

Cleaning Fen Bearings
1. When roller or ball bearings are disassembled for service, the fol-
lowing procedure is recommended: Remove bearing races from

Tgble 4-2
Allowable Vlbratlon at Fan Operating Frequency
(Courtesy CBlCP Ltd.)
INITIAL OPERATION ALARM SHUT DOWN OR STOP
RPM DISPL. VEL. DISPL. VEL. DISPL. VEL.
(MILS) (MILS) ':;I (MILS) (bpKs'
PP PP PP
3600 0.5 .1 1.6 .3 2.4 .45
1800 1.1 .1 3.2 .3 4.8 .45
1200 1.6 .1 4.8 .3 7.2 .45
900 2.1 .1 6.4 .3 9.4 .45
720 2.7 .1 8.0 .3 12.0 .45
600 3.2 .1 9.5 .3 14.3 .45
WOM 1) OPERAWOM DFAlllHll AWIK UARM U3MS eoll APMOLDNGED
9) DISPUCEM~ 13 AUEASUREO WIUIEWRWTHE PRME OR PICKUP PUlODOFTUlEDROPERATlOWABWE~~For~~rcRlODOF
(6PBUICTIPElPOHTlDNEDFIRMLYIGAINSTTHEFANOElffi~~lNG TIMLMAY~SEEDUIPUENTFAlWREANDPIIE~DIYIQEASWEU
INTHE DESIREDPUNE OF MEASUREMENT. DISPLACEMENT 16 A PEAK-TO- ASENDANGERMENTTD~ELAmR~~VEYEREWOVLDBE
PUK [FULL WAVE) VALUE. m R~AIN AN AUWORIZEU CWCP LTD. SERVICE WTM~EMTATIVE (AT
9 INITIAL OPERATION VALUES ARE THE EXPECTED VALUES con c w SEWICES RATES IN EFFECT AT TIYE nsm - 1NST.w
WELLMAINTAINEO AND BALANCED FANS OPERATING AT STEAW STATE UnaN~sffiGEITCDRRECTIvEMEUUM.U~(ECEOUII*lYDBlUNEE
CONDKIONSAmRTHETRANSlENT CONDITIONSOFSTARTUP, E.G. AC- mEF.NIFRECIUIREO~EFFORT~wLDoEYMmYI'UTAINv'IRA~N
CELERATION.lEMPERANRE CHANOES.ETC HAVEPASSED. THE VALUES AS THE OPERA- mRATION AS
IFOR MEASUREMENT OF EQUIPMENT UNBALANCE) MUST UE TIKEN FOR coss'BLE To -E OmYwl E-ENT 'IFE
+HE EXACT FAN OPERATING FREDUENCY FILTERINQ OUT O[TRANEOUS
VALUES THAT CAN BE MEASURED FOR DIFFERENT FREDUENCIES. WESE 4) CWCP LTD. CANNOT OONrROL INST.LuTION WIUILES, SUCH AS
VALUES MAY NOT BE OBTAINED ON NEW. INITIAL INSTALLATIONS OUE TO (BUT NOT LIMITED m) FOUNDATION ANO PROVISIONS. wow-
EEL0 CONDlllDNS MONO THE CONTROL OF CWCP Lm. NER. cum LTD. GUARAUTEES THE HW ROTOR nmmw UNWNCE
WLL NOT EXCEED o w UI~E ma OF *wu aim.