Mechanical Maintenance a Nigata

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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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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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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Mechanical Maintenance a Nigata

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