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7/28/2019 Mechanical Maintenance a Nigata
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Mechanical Maintenance A
How to perform Overhaul the Single
Stage Back Pull Out Type Centrifugalpump (Niigata Worthington Make).
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Overview
This procedure shows you how to overhaul thesingle stage back pull out type centrifugal pump(Niigata Worthington Make).
This procedure is applicable for the following
pumps. P-102A/B, P-115A/BP-119, P2/P3/P4-601A/B, P-
602A/B, P-603A/B, P-606A/B, P-609A/B, P-681A/B, P-682, P-706A/B, P-708A/B, P2/P3/P4-712A/B/C*,P2/P3/P4-714A/B/C*
* with gland packing
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When to do :
This procedure is to be performed upon
recommendation by the CMU or
recommendation by the technicians andapproved by their superior.
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How to Remove and Shift the Pump from
The Site
This task consists of:
discoupling the pump from the driver
blinding works
removal of pump
shifting the pump
housekeeping
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s ows you ow o over au esingle stage back pull out type
centrifugal pump (NiigataWorthington Make).
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This procedure is applicable for
the following pumps.
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P-102A/B
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P-115A/B
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P-119
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P2/P3/P4-601A/B
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P-602A/B
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P-603A/B
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P-606A/B
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P-609A/B
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P-681A/B
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P-682
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P-706A/B
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P-708A/B
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P2/P3/P4-712A/B/C*
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P2/P3/P4-714A/B/C*
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* with gland packing
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When to do This procedure is
to be performed upon
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recommendation by the CMU or
recommen a on y e
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recommen a on y etechnicians and approved by
their superior.
rom e e ow o
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rom e e ow oDisassemble the Pump 5
How to Carry Out anInspection 7 How to
Reassemble the Pump 8
How to Reinstall the Pump
at the Site 9
How to Remove and Shift the Pump from The
Site
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Description This task
consists of:
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discoupling the pump from the
driver
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blinding works
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removal of pump
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shifting the pump
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housekeeping
P li Y
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Policy You must use non-
sparking tools.
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Before you begin
pec a oo s nee e ou
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pec a oo s nee e ouneed to have the following
special tools.
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copper hammer (non-sparking)
Continued on next page
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, Continued
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t th d MZA 302 H
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to the procedure MZA 302 How
to Install and Remove
Coupling)
t th d H t
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to the procedure How to carry
out blinding and deblinding
works
s eps e ow o remove e
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s eps e ow o remove epump Step Action 1
Disconnect the associatedpiping connected to the pump.
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E l Th t
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Example: The most
common pipings are:
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sea us ne equ ppe w
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sea us ne equ ppe wseal pot, then drain it before
disconnecting) cooling water line (Ensure that the coolingwater system is isolated before disconnecting)
2 3 4 Continued on next
page
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, Continued
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the workshop Step Action 1
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the workshop. Step Action 1
Use the fork lift to load the
pump to the pick-up and thentransport it to the workshop.
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mpor an : nsure a e
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mpor an : nsure a epump is secured and tied to the
pick-up.
steps below to carry out
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steps below to carry out
housekeeping.Step Action 1
Cover the openings of the
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casing
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pipes, and
pump. emove a e r s
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pump. emove a e r sand unwanted material. 3
Wipe off any oil spill. How to Disassemble the Pump
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Description This task is to be
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Description This task is to be
carried out at the workshop.
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Before you beginEnsure that:
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the pump is placed on the table
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the pump is placed on the table
properly, safe and
all relevant tools are available
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all relevant tools are available.
pec a oo s nee e ou
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pneed to have the following
special tools.
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bearing puller
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dial gauge
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hydraulic jack, and
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guard plates.
How to doFollow the steps
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How to doFollow the steps
below to disassemble the pump.
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o e: o ow s eps o
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pyou want to replace the
mechanical seal only.
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Followall the steps if you want to replace thebearing. Step Action 1 2 34 5 6 7 8 9 10 11
12 13 14 Continued on next page
C ti d
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, Continued
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lock washer or circlip, whichever
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lock washer or circlip, whichever
is applicable. 17 Pull out the
thrust bearing using the bearingpuller.
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only if necessary. 18 Pull out
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only if necessary. 18 Pull out
the radial bearing using the
bearing puller.
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on y necessary. ace eh ft th V bl k t b i
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shaft on the V block at bearing
locations to avoid damage tothe shaft. How to Carry Out an Inspection
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parts. (E.g. shaft, impeller,
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p ( g , p ,
bearing housing, stuffing box,
etc.)
Special tools needed You
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p
need to have the following tools.
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dial ga ge (magnetic base t pe)
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dial gauge (magnetic base type)
vernier caliper and
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vernier caliper, and
inside and outside micrometer.
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visually for any signs of bent
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y y g
shaft. Impeller 8 Check for
wearing or rubbing marks onimpeller vanes and wear ring. 9
Measure and record thediameter of impeller wear ring
and casing wear ring. 10
Replace if necessary. Other
Parts 11 Measure and record
the throat bush diameter 12
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it. 14 Check for signs of
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g
wearing on the pump casing. 15
Measure and record as perthe check list
How to Reassemble the Pump
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pec a oo s nee e ouneed to have the following
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need to have the following
special tools.
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bearing heater
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bearing heater
Spares needed The spare
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that you need are
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thrust bearing x 2 and
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thrust bearing x 2, and
radial bearing x 1
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radial bearing x 1.
e ow o reassem e e pump.Step Action 1 2 3 4
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Step Action 1 2 3 4
5 6 7 8 9 10 11 1213 14 15 How to Reinstall the Pump at the Site
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Before you begin
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Before you begin
Spares needed The spares
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that you need are:
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casing gasket and
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casing gasket and
piping gasket for deblinding job.
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pec a oo s nee e ouneed to have the following
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need to have the following
special tools.
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chain pulley block
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chain pulley block
teflon tape
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teflon tape
laser alignment tool.
4 Fill the seal pot with
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correct level of barrier fluid. 5
Remove the blinds aftergetting clearance from
operations. 6 Check for anymechanical seal leaks or any
leaks at static condition.
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If no leak, proceed with coupling
d li t
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and alignment.
(Refer to the procedure MZA-302 How toInstall and Remove Coupling and MZA-301
How to Perform Alignment) Continued on
next page
, Continued
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, Continued
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(continued) Step 7 8 9
10 11 12 13 14 15
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10 11 12 13 14 15