hazop study report format_coal pulveriser_200517

7/29/2019 Hazop Study Report Format_Coal Pulveriser_200517

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Company : CGPL Project : Mundra Drawing No. TCE 5146 A 510 -00 -0629 REV: DDrawing Title : COAL FEEDER & PULVERIZER

SYSTEM

Page 1 of 1

Study Team

RMSSVP

PD

PSKD

Line No. / Equipment :

COAL FEEDER &PULVERIZER SYSTEM.

10HFA11-BB001 Coal Silo

Functional and Normal Operating Condition Date of Meeting :

20th May, 2010.

Deviation Caused by Consequence Preventive / Corrective Measures Action RequiredActionNo.

Actionby

None (NO FLOW)Wet coal

Particles of larger size

Liner damagedGate valve stuck

Discharged pipe chocked

Silo choked a) Hammering & poking of silooutletb)Acoustic flow meter is

provided at Silo outlet c)

Inspection of liner in periodicintervald)Ease out of gate valve in

regular intervale)Hammering ofdischarged pipe

a) Automatic silohammering system

to be

Incorporatedb)Aircannon system shall

providedC)Provision of purge air at

gate valved)Poking

hole shall beprovided

High (TEMPERATURE)Non removal of gases

Smoldering of coal

Fire at silo None a)Provision shall beprovided to

evacuate flammablegasesb)Deluge

water system shall

be provided atsiloc)CO

monitoring systemwith audio visual

alarm shallprovided at silo

Start up/shutdown

Faulty level measurementby Ultrasonic level

Hamper Schedule ofsilo filling ,

Calibration chart should beprepared for weight v/s height,

Calibration chart ofWeight v/s height


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Utility

failure

measurement monitor,Peripheral welding work

at silo with coal in silo

Unavailability of fire

water system

Fire ,

Uncontrolled fire

Pre start up safety audit shall be

done prior to filling coal (PSUSR)

Provision from other unit water

Arrangement of fire tender

PSUSR ,

Provision of firewater from other

system,MARG agreement


3/9


SYSTEM

Page 1 of 1

Study TeamRMS

SVP

PDPS

KD

Line No. / Equipment :10HFB11-AF001 Coal

Feeder (Coal silo to coal

feeder)

Functional and Normal Operating Condition Date of Meeting :20th May, 2010.

Deviation Caused by Consequence Preventive / Corrective Measures Action RequiredAction

No.

Action

by

High Temp Fire in silo Damage of coal

feeder belt

Temperature high alarm provided

at UCB

Water deluge line

shall be provided

near feeder floor

Utility

failure

Non availability of water

hydrant system

Uncontrolled fire Provision from other unit water, Arrangement of

fire tender,MARG agreement


4/9


SYSTEM

Page 1 of 1

Study TeamRMS

SVP

PDPS

KD

Line No. / Equipment :10HFC11 Pulverizer ( Coal

feeder to Pulverizer)



No.

Action

by

None (No Flow)

Feeder outlet pipe

chocked

Loss in generation SOP is written,

Current indication in DCS

provided,After stopping mill lineshall be flushed with water

SMP to be written

for cleaning feeder

outlet pipe

High (Temperature)Due to spark inside mill Mill explosion/fire CO monitoring systemprovided,Inert steam system

provided,Water deluge systemprovided

Auto operation ofinert steam valve to

be provided,

Remote monitoring

of area throughCCTV


5/9


SYSTEM

Page 1 of 1

Study TeamRMS

SVP

PDPS

KD

Line No. / Equipment :Deluge water line to

Pulverizer



No.

Action

by

Start up/shut

down

Isolation of Purging Line

to water deluge system

during maintenance

Person may get

injured while

working inside mill

SMP to isolate line before entering

mill

Manual Isolation

valve to be

provided onpurging line


SYSTEM

Page 1 of 1

Study Team

RMSSVP

PDPS

KD

Line No. / Equipment :

Lube oil system of

Pulverizer

Functional and Normal Operating Condition Date of Meeting :

20th May, 2010.

Deviation Caused by Consequence Preventive / Corrective Measures Action RequiredActionNo.

Actionby

UtilityFailure

Voltage dip due Griddisturbance

Lube oil pump Tripsubsequently mill

trip

Delay in tripping of pump isrequired

Control ckt needsmodification.


6/9


7/9


SYSTEM

Page 1 of 1

Study TeamRMS

SVP

PDPS

KD

Line No. / Equipment :Mill inert steam system to

Pulverizer



No.

Action

by

None Non availability of inert

steam header

Explosion/fire in

mill

Ensure inert steam header is

charged always

Inert steam pressure

indication should

be provided onDCS on pulv

schematic


SYSTEM

Page 1 of 1

Study TeamRMS

SVPPD

PSKD

Line No. / Equipment :Mill discharge lines from

Pulverizer



No.

Action

by

None Chocking of line Uneven coal

distribution infurnace,

Fire in pipe

None Provision of temp

measurement inmill disch pipe


8/9

Other than Low flow due to Unevenline length

Shifting of fire ball,Uneven distribution

of heat flux

Orifice is provided in line Dirty pitot test tobe done

periodically,SMP to be prepared


SYSTEM

Page 1 of 1

Study TeamRMS

SVPPD

PS

KD

Line No. / Equipment :Primary air to Pulverizer



No.

Action

by

Reverse Coal accumulation inmill Chocking of inlet airduct Wire mesh is provided to block thereverse entry of coal,Inert steam

connection is provided in air inlet

At the PA inlet tothe pulv where

mettalic mesh isprovided it is

proposed toprovide 2 inch

metallic strip at

bottom to preventspillage of coal in

to the PA duct

Start-up/shutdown

Starting & stopping ofmill for maintenance Spark, Explosion SOP for startup & shut down, Explosion vents tobe provided inducts & it shall be

laid to safe area,


9/9


SYSTEM

Page 1 of 1

Study TeamRMS

SVP

PDPS

KD

Line No. / Equipment :Mill reject system



No.

Action

by

Utility

Failure

Air failure Reject handling

valve cannot be

operated

None Provision of

Manual operation

facility to beprovided

hazop study report format_coal pulveriser_200517

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