Maintenance Guidelines--Centrifugal Pump Fits and Clearance Checklist

style='font-size:12.0pt;font-family:Garamond;color:black'>
Elfer Inc. TM

Maintenance
Guidelines

style='font-size:10.0pt;font-family:Garamond;color:black'>Machinery Reliability
Programs

style='font-family:Garamond;color:black'>Luis F. Rizo, PE style='mso-tab-count:3'> Phone:
518-371-0683

style='mso-tab-count:1'> style='font-family:Garamond;color:black'> 4
Mates Way Fax:
518-371-0683

style='mso-tab-count:3'> Waterford,
New York 12188-1165 style='font-family:Garamond'>http://www.elfer.com style='font-family:Garamond;color:black'>

position:relative;z-index:0'> top:-26px;width:574px;height:5px'> src="fits%20PS040306_files/image012.gif" v:shapes="_x0000_s1026"> style='color:black'>

color:black'>


color:black'>8.1 Centrifugal
pumps fits and clearance checklist. Basic data

mso-table-layout-alt:fixed;border:none;mso-border-alt:solid windowtext .75pt;
mso-padding-alt:0in 5.4pt 0in 5.4pt'>
border-bottom:none;padding:0in 5.4pt 0in 5.4pt'>

color:black'>No:

border-left:none;border-bottom:none;border-right:solid windowtext .75pt;
mso-border-left-alt:solid windowtext .75pt;padding:0in 5.4pt 0in 5.4pt'>

color:black'>Measurement

border-left:none;border-bottom:none;border-right:solid windowtext .75pt;
mso-border-left-alt:solid windowtext .75pt;padding:0in 5.4pt 0in 5.4pt'>

Tolerance

border-bottom:none;padding:0in 5.4pt 0in 5.4pt'>

style='color:black'>1.
style='color:black'>

border-left:none;border-bottom:none;border-right:solid windowtext .75pt;
mso-border-left-alt:solid windowtext .75pt;padding:0in 5.4pt 0in 5.4pt'>

Ball bearing inside diameter (I.
D.) to shaft.

border-left:none;border-bottom:none;border-right:solid windowtext .75pt;
mso-border-left-alt:solid windowtext .75pt;padding:0in 5.4pt 0in 5.4pt'>

0.0001"
to 0.0007" (0.003mm to 0.018mm) interference.

border-bottom:none;padding:0in 5.4pt 0in 5.4pt'>

style='color:black'>2.
style='color:black'>

border-left:none;border-bottom:none;border-right:solid windowtext .75pt;
mso-border-left-alt:solid windowtext .75pt;padding:0in 5.4pt 0in 5.4pt'>

Ball bearing outside diameter
(O. D.) to housing.

border-left:none;border-bottom:none;border-right:solid windowtext .75pt;
mso-border-left-alt:solid windowtext .75pt;padding:0in 5.4pt 0in 5.4pt'>

0.0001"
to 0.001" (0.003mm to 0.03mm) clearance.

border-bottom:none;padding:0in 5.4pt 0in 5.4pt'>

style='color:black'>3.
style='color:black'>

border-left:none;border-bottom:none;border-right:solid windowtext .75pt;
mso-border-left-alt:solid windowtext .75pt;padding:0in 5.4pt 0in 5.4pt'>

Sleeve to shaft.

border-left:none;border-bottom:none;border-right:solid windowtext .75pt;
mso-border-left-alt:solid windowtext .75pt;padding:0in 5.4pt 0in 5.4pt'>

0.001"
to 0.0015" (0.03mm a 0.04mm) clearance.

padding:0in 5.4pt 0in 5.4pt'>

style='color:black'>4.
style='color:black'>

border-left:none;mso-border-left-alt:solid windowtext .75pt;padding:0in 5.4pt 0in 5.4pt'>

Impeller to shaft.

border-left:none;mso-border-left-alt:solid windowtext .75pt;padding:0in 5.4pt 0in 5.4pt'>

Metal
to metal fit to 0.0005" (0.13mm) clearance.

border-left:solid windowtext .75pt;border-bottom:none;border-right:solid windowtext .75pt;
padding:0in 5.4pt 0in 5.4pt'>

Note: there are pumps such as horizontal, axial split pumps and
multi-stage vertical pumps that have interference fits. Consult your OEM
manual

margin-bottom:0in;margin-left:-5.4pt;margin-bottom:.0001pt;text-align:center'> style='font-size:9.0pt;color:black'>

border-left:solid windowtext .75pt;border-bottom:none;border-right:none;
padding:0in 5.4pt 0in 5.4pt'>

style='color:black'>5.
style='color:black'>

padding:0in 5.4pt 0in 5.4pt'>

Throat bushing style='color:black'>

border-left:none;border-bottom:none;border-right:solid windowtext .75pt;
padding:0in 5.4pt 0in 5.4pt'>

style='color:black'>

padding:0in 5.4pt 0in 5.4pt'>

style='color:black'>a)
style='color:black'>

border-left:none;mso-border-left-alt:solid windowtext .75pt;padding:0in 5.4pt 0in 5.4pt'>

Throat bushing to case.

border-left:none;mso-border-left-alt:solid windowtext .75pt;padding:0in 5.4pt 0in 5.4pt'>

0.002"
to 0.003" (0.05mm a 0.08mm) interference.

solid windowtext .75pt;border-bottom:none;border-right:solid windowtext .75pt;
padding:0in 5.4pt 0in 5.4pt'>

style='color:black'>b)
style='color:black'>

mso-border-left-alt:solid windowtext .75pt;padding:0in 5.4pt 0in 5.4pt'>

Throat bushing to shaft.

mso-border-left-alt:solid windowtext .75pt;padding:0in 5.4pt 0in 5.4pt'>

0.015"
to 0.020" (0.40 a 0.51mm) clearance.

border-bottom:none;padding:0in 5.4pt 0in 5.4pt'>

style='color:black'>c)
style='color:black'>

border-left:none;border-bottom:solid windowtext .75pt;border-right:none;
mso-border-left-alt:solid windowtext .75pt;padding:0in 5.4pt 0in 5.4pt'>

The
throat bushings on some vertical in-line pumps act as clearances.

border-left:none;padding:0in 5.4pt 0in 5.4pt'>

0in;margin-left:-.9pt;margin-bottom:.0001pt'>intermediate
bearings and require closer.

border-right:none;padding:0in 5.4pt 0in 5.4pt'>

style='color:black'>6.
style='color:black'>

Impeller style='color:black'>

none;border-bottom:solid windowtext .75pt;border-right:solid windowtext .75pt;
padding:0in 5.4pt 0in 5.4pt'>

style='color:black'>

solid windowtext .75pt;border-bottom:none;border-right:solid windowtext .75pt;
padding:0in 5.4pt 0in 5.4pt'>

style='color:black'>a)
style='color:black'>

border-left:none;mso-border-left-alt:solid windowtext .75pt;padding:0in 5.4pt 0in 5.4pt'>

Impeller ring to hub.

mso-border-left-alt:solid windowtext .75pt;padding:0in 5.4pt 0in 5.4pt'>

0.002"
to 0.003" (0.05mm a 0.08mm interference.

padding:0in 5.4pt 0in 5.4pt'>

The impeller ring is normally doweled or spot welded in at least two places

solid windowtext .75pt;border-bottom:none;border-right:solid windowtext .75pt;
padding:0in 5.4pt 0in 5.4pt'>

style='color:black'>b)
style='color:black'>

mso-border-top-alt:solid windowtext .75pt;mso-border-left-alt:solid windowtext .75pt;
padding:0in 5.4pt 0in 5.4pt'>

Impeller ring to case ring
clearance.

mso-border-left-alt:solid windowtext .75pt;padding:0in 5.4pt 0in 5.4pt'>

0.010"
to 0.012" (0.254mm a 0.3mm) plus 0.001" (0.03mm) per in. (25.4mm) of
impeller ring diameter up to a 12" (3,658mm) ring. Add 0.0005 (0.013mm)
per inch (25.4mm) of ring diameter over 12" (3,658mm). For temp.
style='font-family:Symbol;color:black;mso-char-type:symbol;mso-symbol-font-family:
Symbol'> > or = style='color:black'> 500 degrees mso-char-type:symbol;mso-symbol-font-family:Symbol'> style='mso-char-type:symbol;mso-symbol-font-family:Symbol'> style='color:black'> (260 mso-char-type:symbol;mso-symbol-font-family:Symbol'> style='mso-char-type:symbol;mso-symbol-font-family:Symbol'>o style='color:black'>C) add 0.10" (2.54mm). Also add 0.005 (0.127mm) for
galling materials (stainless steel).

border-bottom:none;padding:0in 5.4pt 0in 5.4pt'>

style='color:black'>c)
style='color:black'>

border-left:none;mso-border-left-alt:solid windowtext .75pt;padding:0in 5.4pt 0in 5.4pt'>

Renew impeller rings when
clearance reaches twice original clearance.

border-left:none;border-bottom:none;border-right:solid windowtext .75pt;
mso-border-left-alt:solid windowtext .75pt;padding:0in 5.4pt 0in 5.4pt'>

style='color:black'>

border-right:none;padding:0in 5.4pt 0in 5.4pt'>

style='color:black'>7.
style='color:black'>

Case rings style='color:black'>

border-left:none;padding:0in 5.4pt 0in 5.4pt'>

style='color:black'>

solid windowtext .75pt;border-bottom:none;border-right:solid windowtext .75pt;
padding:0in 5.4pt 0in 5.4pt'>

style='color:black'>a)
style='color:black'>

border-left:none;border-bottom:none;border-right:solid windowtext .75pt;
mso-border-left-alt:solid windowtext .75pt;padding:0in 5.4pt 0in 5.4pt'>

Case rings are not to be bored
out larger than 3% of original diameter.

mso-border-left-alt:solid windowtext .75pt;padding:0in 5.4pt 0in 5.4pt'>

style='color:black'>

padding:0in 5.4pt 0in 5.4pt'>

style='color:black'>b)
style='color:black'>

border-left:none;mso-border-left-alt:solid windowtext .75pt;padding:0in 5.4pt 0in 5.4pt'>

Case ring to case.

border-left:none;mso-border-left-alt:solid windowtext .75pt;padding:0in 5.4pt 0in 5.4pt'>

0.002"
to 0.003" (0.05mm a 0.08mm) interference.

border-left:solid windowtext .75pt;border-bottom:none;border-right:solid windowtext .75pt;
padding:0in 5.4pt 0in 5.4pt'>

margin-bottom:0in;margin-left:-5.4pt;margin-bottom:.0001pt;text-align:center'> style='color:black'>The case ring is normally doweled or spot welded in at
least two places.

border-bottom:none;padding:0in 5.4pt 0in 5.4pt'>

style='color:black'>8.
style='color:black'>

border-left:none;mso-border-left-alt:solid windowtext .75pt;padding:0in 5.4pt 0in 5.4pt'>

Oil deflector to shaft.

border-left:none;border-bottom:none;border-right:solid windowtext .75pt;
mso-border-left-alt:solid windowtext .75pt;padding:0in 5.4pt 0in 5.4pt'>

0.002"
to 0.003" (0.05mm a 0.08mm) clearance. Install "O" ring in the
ID if possible.

border-right:none;padding:0in 5.4pt 0in 5.4pt'>

style='color:black'>9.
style='color:black'>

Packing gland style='color:black'>

border-left:none;padding:0in 5.4pt 0in 5.4pt'>

style='color:black'>

border-top:none;padding:0in 5.4pt 0in 5.4pt'>

style='color:black'>a)
style='color:black'>

border-left:none;mso-border-left-alt:solid windowtext .75pt;padding:0in 5.4pt 0in 5.4pt'>

Packing gland to shaft.

none;border-bottom:solid windowtext .75pt;border-right:solid windowtext .75pt;
mso-border-left-alt:solid windowtext .75pt;padding:0in 5.4pt 0in 5.4pt'>

1/32"
(0.8mm) clearance.

solid windowtext .75pt;border-bottom:none;border-right:solid windowtext .75pt;
padding:0in 5.4pt 0in 5.4pt'>

style='color:black'>b)
style='color:black'>

none;border-bottom:solid windowtext .75pt;border-right:solid windowtext .75pt;
mso-border-left-alt:solid windowtext .75pt;padding:0in 5.4pt 0in 5.4pt'>

Packing gland to stuffing box
bore.

mso-border-left-alt:solid windowtext .75pt;padding:0in 5.4pt 0in 5.4pt'>

1/64"
(0.016mm) clearance.

border-right:none;padding:0in 5.4pt 0in 5.4pt'>

style='color:black'>10.
style='color:black'>

Lantern ring style='color:black'>

border-left:none;padding:0in 5.4pt 0in 5.4pt'>

.

border-top:none;padding:0in 5.4pt 0in 5.4pt'>

style='color:black'>a)
style='color:black'>

border-left:none;mso-border-left-alt:solid windowtext .75pt;padding:0in 5.4pt 0in 5.4pt'>

Lantern ring to shaft.

none;border-bottom:solid windowtext .75pt;border-right:solid windowtext .75pt;
mso-border-left-alt:solid windowtext .75pt;padding:0in 5.4pt 0in 5.4pt'>

0.015"
to 0.020" (0.40mm a 0.51mm) clearance.

solid windowtext .75pt;border-bottom:none;border-right:solid windowtext .75pt;
mso-border-top-alt:solid windowtext .75pt;padding:0in 5.4pt 0in 5.4pt;
height:15.9pt'>

style='color:black'>b)
style='color:black'>

mso-border-top-alt:solid windowtext .75pt;mso-border-left-alt:solid windowtext .75pt;
padding:0in 5.4pt 0in 5.4pt;height:15.9pt'>

Lantern ring to stuffing box.

mso-border-top-alt:solid windowtext .75pt;mso-border-left-alt:solid windowtext .75pt;
padding:0in 5.4pt 0in 5.4pt;height:15.9pt'>

0.005"
to 0.010" (0.13mm a 0.25mm) clearance.

padding:0in 5.4pt 0in 5.4pt'>

style='color:black'>11.
style='color:black'>

border-left:none;mso-border-left-alt:solid windowtext .75pt;padding:0in 5.4pt 0in 5.4pt'>

Coupling to shaft.

border-left:none;mso-border-left-alt:solid windowtext .75pt;padding:0in 5.4pt 0in 5.4pt'>

Metal
to metal to 0.0005 (0.013mm) clearance.

EN-US;mso-fareast-language:EN-US'>
line-break;page-break-before:always'>

mso-table-layout-alt:fixed;border:none;mso-border-alt:solid windowtext .75pt;
mso-padding-alt:0in 5.4pt 0in 5.4pt'>
border-right:none;padding:0in 5.4pt 0in 5.4pt'>

12.

border-right:none;padding:0in 5.4pt 0in 5.4pt'>

Seal gland style='color:black'>

padding:0in 5.4pt 0in 5.4pt'>

style='color:black'>

border-top:none;padding:0in 5.4pt 0in 5.4pt'>

style='color:black'>a)
style='color:black'>

none;border-bottom:solid windowtext .75pt;border-right:solid windowtext .75pt;
mso-border-left-alt:solid windowtext .75pt;padding:0in 5.4pt 0in 5.4pt'>

Seal gland alignment boss to
stuffing box.

border-bottom:solid windowtext .75pt;border-right:solid windowtext .75pt;
mso-border-left-alt:solid windowtext .75pt;padding:0in 5.4pt 0in 5.4pt'>

0.002" to 0.004"
(0.05mm a 0.10mm) clearance.

border-top:none;mso-border-top-alt:solid windowtext .75pt;padding:0in 5.4pt 0in 5.4pt'>

style='color:black'>b)
style='color:black'>

none;border-bottom:solid windowtext .75pt;border-right:solid windowtext .75pt;
mso-border-top-alt:solid windowtext .75pt;mso-border-left-alt:solid windowtext .75pt;
padding:0in 5.4pt 0in 5.4pt'>

Seal gland throttle bushing to
shaft.

border-bottom:solid windowtext .75pt;border-right:solid windowtext .75pt;
mso-border-top-alt:solid windowtext .75pt;mso-border-left-alt:solid windowtext .75pt;
padding:0in 5.4pt 0in 5.4pt'>

0.018" to 0.020"
(0.5mm to 0.51mm) clearance, unless otherwise specified for hot pumps.

border-top:none;mso-border-top-alt:solid windowtext .75pt;padding:0in 5.4pt 0in 5.4pt'>

style='color:black'>13.
style='color:black'>

none;border-bottom:solid windowtext .75pt;border-right:solid windowtext .75pt;
mso-border-top-alt:solid windowtext .75pt;mso-border-left-alt:solid windowtext .75pt;
padding:0in 5.4pt 0in 5.4pt'>

Seal locking collar to shaft.

border-bottom:solid windowtext .75pt;border-right:solid windowtext .75pt;
mso-border-top-alt:solid windowtext .75pt;mso-border-left-alt:solid windowtext .75pt;
padding:0in 5.4pt 0in 5.4pt'>

0.002" to 0.004"
(0.05mm a 0.10mm) clearance

border-top:none;mso-border-top-alt:solid windowtext .75pt;padding:0in 5.4pt 0in 5.4pt'>

style='color:black'>14.
style='color:black'>

none;border-bottom:solid windowtext .75pt;border-right:solid windowtext .75pt;
mso-border-top-alt:solid windowtext .75pt;mso-border-left-alt:solid windowtext .75pt;
padding:0in 5.4pt 0in 5.4pt'>

Seal spring compression.

border-bottom:solid windowtext .75pt;border-right:solid windowtext .75pt;
mso-border-top-alt:solid windowtext .75pt;mso-border-left-alt:solid windowtext .75pt;
padding:0in 5.4pt 0in 5.4pt'>

7/8" (22.2mm) long springs
- 3/16"(4.8mm).

border-top:none;mso-border-top-alt:solid windowtext .75pt;padding:0in 5.4pt 0in 5.4pt'>

style='color:black'>

none;border-bottom:solid windowtext .75pt;border-right:solid windowtext .75pt;
mso-border-top-alt:solid windowtext .75pt;mso-border-left-alt:solid windowtext .75pt;
padding:0in 5.4pt 0in 5.4pt'>

color:black;mso-char-type:symbol;mso-symbol-font-family:Symbol'> style='mso-char-type:symbol;mso-symbol-font-family:Symbol'>" style='color:black'>

border-bottom:solid windowtext .75pt;border-right:solid windowtext .75pt;
mso-border-top-alt:solid windowtext .75pt;mso-border-left-alt:solid windowtext .75pt;
padding:0in 5.4pt 0in 5.4pt'>

æ style='color:black'>" (12.5mm) color:black'> long springs -
5/32"(4.0mm)

border-top:none;mso-border-top-alt:solid windowtext .75pt;padding:0in 5.4pt 0in 5.4pt'>

style='color:black'>

none;border-bottom:solid windowtext .75pt;border-right:solid windowtext .75pt;
mso-border-top-alt:solid windowtext .75pt;mso-border-left-alt:solid windowtext .75pt;
padding:0in 5.4pt 0in 5.4pt'>

Seal spring compression.

border-bottom:solid windowtext .75pt;border-right:solid windowtext .75pt;
mso-border-top-alt:solid windowtext .75pt;mso-border-left-alt:solid windowtext .75pt;
padding:0in 5.4pt 0in 5.4pt'>

1/2"(12.7mm) style='color:black'>short springs - 1/16" (1.6mm) unless otherwise
specified by the manufacturer.

border-top:none;mso-border-top-alt:solid windowtext .75pt;padding:0in 5.4pt 0in 5.4pt'>

style='color:black'>15.
style='color:black'>

none;border-bottom:solid windowtext .75pt;border-right:solid windowtext .75pt;
mso-border-top-alt:solid windowtext .75pt;mso-border-left-alt:solid windowtext .75pt;
padding:0in 5.4pt 0in 5.4pt'>

Rotating and stationary seal
rings.

border-bottom:solid windowtext .75pt;border-right:solid windowtext .75pt;
mso-border-top-alt:solid windowtext .75pt;mso-border-left-alt:solid windowtext .75pt;
padding:0in 5.4pt 0in 5.4pt'>

Sealing surfaces to be flat
within 3 Helium light bands

border-top:none;mso-border-top-alt:solid windowtext .75pt;padding:0in 5.4pt 0in 5.4pt'>

style='color:black'>16.
style='color:black'>

none;border-bottom:solid windowtext .75pt;border-right:solid windowtext .75pt;
mso-border-top-alt:solid windowtext .75pt;mso-border-left-alt:solid windowtext .75pt;
padding:0in 5.4pt 0in 5.4pt'>

Heads, case, suction cover,
bearing housing to case alignments fits.

border-bottom:solid windowtext .75pt;border-right:solid windowtext .75pt;
mso-border-top-alt:solid windowtext .75pt;mso-border-left-alt:solid windowtext .75pt;
padding:0in 5.4pt 0in 5.4pt'>

0.004"
(0.01mm) maximum clearance. Use dial indicator and feeler gauges to correct
fit-up and alignment.

style='font-size:11.0pt;color:black'>Horizontal axial split case

style='color:black'>

style='color:black'>1. Stationary
parts fit case metal to metal to
0.004" (0.01mm) clearance.

style='color:black'>2. Measure
and inspect case fits for wear and
corrosion. Repair by building up
and re-machining.

tab-stops:.3in .5in 1.0in 1.5in 2.0in 2.5in 3.0in 3.5in 4.0in 4.5in 5.0in 5.5in 6.0in 6.5in 7.0in 7.5in'> style='color:black'>3. All
other repairs same as vertical radial split case pumps except: Case
rings to be bored in a jig not chucked.

tab-stops:.3in .5in 1.0in 1.5in 2.0in 2.5in 3.0in 3.5in 4.0in 4.5in 5.0in 5.5in 6.0in 6.5in 7.0in 7.5in'> style='color:black'>4. Align
element in case with feeler gauges and dial indicator. style="mso-spacerun: yes"> Dowel bearing housing in place after
alignment.

style='color:black'>5. style='mso-tab-count:1'> When cutting gaskets
for horizontal split pumps, cut bolt hole openings on head and split gasket
lengthwise. Cut the rest of the
gasket on the case with all the slack in the boltholes pulled to the outside
edges. Leave stuffing box gasket
length long and trim after head has been set in place and tightened.

style='color:black'>

style='color:black'>OVERHUNG IMPELLER, SEPARATELY COUPLED, SINGLE STAGE,
FRAME MOUNTED title=""> footnote'> [i]

mso-table-layout-alt:fixed;mso-padding-alt:0in 5.4pt 0in 5.4pt'>

1 Casing

18 Bearing, outboard

47 Seal, bearing cover,
inboard

2 Impeller

19 Frame

49
Seal, bearing, cover, outboard

6 Shaft, pump

22 Locknut, bearing style='mso-tab-count:1'>

67 Shim, frame liner

11 Cover, stuffing box

29 Ring, lantern

69 Lockwasher

13 Packing

37 Cover, bearing

71 Adapter

16 yes"> Bearing, inboard

40 Deflector

73 Gasket

17 Gland

46 Key, coupling

style='color:black'>



name="_edn1" title=""> footnote'> [i] style="mso-spacerun: yes"> Courtesy of the Hydraulic Institute
Standards.

Copyright symbol;mso-symbol-font-family:Symbol'> mso-symbol-font-family:Symbol'> Elfer, inc. 1998, Waterford, New
York

style='color:green'>HOME PAGE

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