Centrifugal Pumps Design and Application 2nd ed - Val S. Lobanoff, Robert R. Ross (Butterworth-Heinemann, 1992)

Table 18-3
Balance Quality Grades for Various Groups of Representative
Rigid Rotors
Balance quality
grades
sw a>b
G (mm/sec) Rotor types—General examples
C 4 000 4 000 Crankshaft-drives* of rigidly mounted stow marine ditto! engines with uneven number of
cylinders. 1 *
G t HO 1 600 Crankshaft-drives of rigidly mounted large two-cycle engines.
6 630 630 Crankshaft-drives of rigidly mourned largt four-eyed engine*.
CranksHaf l-drivm of elastically mounted marine difMl engines.
G *SQ 250 Crankshefl-drives of rigidly mounted fast four-cylinder dieMl engines."
C tOO 100 Crankshafl-drlvei of f*t1 dietel engine! with six or more cylinders.* 1
Complete engines (gasoline or ditMl) for tin. trucks, »nd locomotives,*
C 40 40 Car wheels. vvhe*l rim*, wheel sets, drive shafts
Cranksheft-drivei of •iMtically mounted fast four-cycle engines (gaioline or diesett with tix
or more cyllnderf, 8
Crankshaft-drive* for enginei of can, trucks, end locomotives,
G '16 16 Drive thafti (propeller thiftt, cardan sh»(t>l whri ipeciai requirements.
Parts of crushing machinery,
Parn of agriculture! machinery. [
Individual component* of ertB'nai (gatoline or dietel) for cars, truekt, and locomotMt.
Crankshaft-drivei of engines with iix or more eylinderf under special requirements
Slurry or dradge pump impeller.
G 6.3 6,3 Parti or process plant machines.
Marine main turbini geert (merchant service).
Centrifuge drttmi.
Fani.
Assembled aircraft gat turbine rotort.
Fly wheel!
Pump impeileri.
Machine-toot and general machinery pans.
Normal electrical armatures.
Individual components of engines under special requirements.
G 25 !.'•> Get and (team turbines, including marina main turbines (merchant service).
Rigid turbo-generator roiori.
1
Rotors.
Turbo-compressor)
Machine-tool drivet.
Medium and large electrical armatures with special requirements.
Small electrical ermaturei.
Turbine-driven pumps.
G t 1 Tape recorder and phonograph (gramophone) drives.
Grino'ing-machine drives.
Small electrical armatures with special requirements.
G 0.4 0,4 Spindles. ditKs, and armatures at precision grinders.
Gyroscopei.
^^
" w = 2vn/60 ** n/10, ifn is measured in revolutions per minute and w in radians per second.
* In general, for rigid rotors with two correction planes, one-half of the recommended residual
unbalance is to be taken for each plane, these values apply usually for any two arbitrarily chosen
planes, but the state of unbalance may be improved upon at the bearings. (See Ses, 3.2 and 3.4.)
for disk-shaped rotors the full recommended value holds for one plane. (See Sec. 3.)
c A crankshaft-drive is an assembly which includes the crankshaft, a flywheel, clutch, pulley,
vibration damper, rotating portion of connecting rod, etc. (See Sec, 3.5.)
d For purposes of this Standard, slow diesel engines are those with a piston velocity of less than 9
m/sec; fast diesel engines are those with a piston velocity of greater than 9 m/sec.
' In complete engines, the rotor mass comprises the sum of all masses belonging to the
crankshaft-drive described in Note c above.