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Debris Filter (Cleaning Device For Closed Cooling Water)

Maintenance Report

January 19~20, 2012

Prepared byAshik Ahmed

Maintenance EngineerIn a Multinational Power Plant

Email: ashik_rofy@yahoo.com,ashik.rofy@gmail.comMobile: +880-173-0059920

January 19~20, 2012

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EQUIPMENT NO:EQUIPMENT NO:EQUIPMENT NO:EQUIPMENT NO: AC-M-SR-001

EQUIPMENT NAME:EQUIPMENT NAME:EQUIPMENT NAME:EQUIPMENT NAME: DEBRIS FILTER

INTRODUCTIONINTRODUCTIONINTRODUCTIONINTRODUCTION

Debris filter is used to protect heat exchanger tubes from cooling water

fragments. The debris filter is designed to automatically separate & remove

debris from cooling water during operation of the cooling system.

PROBLEM:PROBLEM:PROBLEM:PROBLEM: Debris filter D.P was high & debris was not coming from debris outlet nozzle.

DISDISDISDISMANTLING PROCEDUREMANTLING PROCEDUREMANTLING PROCEDUREMANTLING PROCEDURE During the outage period the following works were carried out in debris filter:-

I. Debris filter manhole was opened. It was seen that the main shaft with injection (spraying) arm were rotating (CW outlet side of the screen basket) but the collecting arm was not rotating (CW inlet side of the screen basket).

II. The collecting arm & outlet pipes were dismantled.

January 19~20, 2012

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III. The outlet bearing was found jam and dismantled. IV. The coupling (Outlet disc) disc bolts (M 16 six nos) were found sheared.

V. The gear box, motor & front sealing was dismantled. VI. Drive shaft sealing disc was dismantled and the seals were found worn.

January 19~20, 2012

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ASSEMBLING PROCEDUREASSEMBLING PROCEDUREASSEMBLING PROCEDUREASSEMBLING PROCEDURE � The new M-16 bolts of drive shaft were quite a bit long so it was machined in M/S Meghnaghat Power Plant work shop.

� New seals were installed in drive shaft sealing disc & sealing disc cover respectively.

� The new outlet bearing was installed by hydraulic press in the MPL workshop. After matching with the outlet pipe 01 mm clearance was found.

� � �

January 19~20, 2012

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� The drive shaft with Injection arm, sealing disc were installed with new gasket. The gap between the arm & basket was found 4 to 6 m. m. Some portion of spraying water was leaking through the injection arm front side. It was welded properly as well as some machining was done in the injection arm flange to ease the installing procedure.

� The gearbox with motor was then coupled with the drive shaft.

January 19~20, 2012

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� The out let (Coupling) disc was installed by new M-16 Allen key bolts.

� The out let bearing was installed after proper bearing alignment. � The out let pipe and the collecting arms were installed.

January 19~20, 2012

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After successful completion of the overhauAfter successful completion of the overhauAfter successful completion of the overhauAfter successful completion of the overhauling workling workling workling work the the the the

debrisdebrisdebrisdebris filterfilterfilterfilter was owas owas owas operatedperatedperatedperated for 15 minutes .for 15 minutes .for 15 minutes .for 15 minutes .The overall The overall The overall The overall

condition was condition was condition was condition was found found found found goodgoodgoodgood....

CONSUMED CONSUMED CONSUMED CONSUMED SPARES:SPARES:SPARES:SPARES:----

SerialSerialSerialSerial Part NoPart NoPart NoPart No DescriptionDescriptionDescriptionDescription Qty UsedQty UsedQty UsedQty Used

Qty to Qty to Qty to Qty to ProcureProcureProcureProcure for for for for Future Future Future Future

MaintenanceMaintenanceMaintenanceMaintenance 01 AC-M-SR-001-

SEAL-02 U SEAL,PART NO 3206, Dwg No:-- GI 829 201 05 057

01 02

02 AC-M-SR-001-SlLVE-01

SEAL (Lubron),PART NO 3207, Dwg No:-- GI 829 201 05 057

01 02

03 NEW CODE REQUIRED

Injection pipe seal ø125X110X12 mm , Part No- 3607 Dwg No:-- GI 829 201 05 061

01 (From Vendor)

01(01 is given by vendor)

04 NEW CODE REQUIRED

Injection pipe seal ø75X63X8.7 mm , Part No- 3617 Dwg No:-- GI 829 201 05 061

01 (From Vendor)

01(01 is given by vendor)

05 NEW CODE REQUIRED

Injection pipe o-ring ID 350X T 5.3 mmø, Part No-3606 Dwg No:-- GI 829 201 05 061

01 (From Vendor)

01(01 is given by vendor)

06 AC-M-SR-001-SlLVE-02

Outlet bearing (Lubron) ø 152X139X60 mm , Part No- 3723

Dwg No:-- NA (Scanned copy could be sent)

01 02

07 AC-M-SR-001-RING-01 (WS spare is not of proper size)

(V-Ring) ø 161X141X146X35 mm , Part No- 3724 Dwg No:-- NA (Scanned copy could be sent)

01 (Old One)

02

08 AC-M-SR-001-

RING-01 (WS spare is not of proper size)

Screen basket (Lebrun) ID 103 01

(Old One)

02

09 AC-M-SR-001-GSKT-02

Gasket 01

02

January 19~20, 2012

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DRAWINGS:DRAWINGS:DRAWINGS:DRAWINGS:----

January 19~20, 2012

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January 19~20, 2012

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