a diesel engine protection systems and alarms _ marine notes

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Home raquo A diesel engine protection systems and alarms raquo A diesel engine protection systems and alarms

A diesel engine protection systems and alarms

A diesel engine is designed with protection systems to alert theoperators of abnormal conditions

and to prevent the engine from destroying itself

Overspeed device shy Because a diesel is not selfshyspeedshylimiting a failure in the governorinjection system or sudden loss of load could cause the diesel to

overspeed An overspeed condition is extremely dangerous becauseengine failure is usually catastrophic and can possibly cause the

engine tofly apart

An overspeed device usually some type of mechanical flyweight willact

to cut off fuel to the engine and alarm at a certain preset rpm This isusually accomplished by isolating the governor from its oil supply

causing

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it to travel to the noshyfuel position or it can override the governor anddirectly trip the fuel rack to the noshyfuel position

Water jacket shyWatershycooled engines can overheat if the cooling water system fails

toremove waste heat Removal of the waste heat prevents the engine

fromseizing due to excessive expansion of the components under a hightemperature condition The cooling water jacket is commonly where

thesensor for the cooling water system is located

The water jacket temperature sensors provide early warning ofabnormal

engine temperature usually an alarm function only The setpoint isset

such that if the condition is corrected in a timely manner significantengine damage will be avoided But continued engine operation at

thealarm temperature or higher temperatures will lead to engine

damage

Exhaust temperatures shyIn a diesel engine exhaust temperatures are very important and can provide a vast amount of information regarding the operation of theengine High exhaust temperature can indicate an overloading of theengine or possible poor performance due to inadequate scavenging

(thecooling effect) in the engine Extended operation with high exhausttemperatures can result in damage to the exhaust valves piston

andcylinders The exhaust temperature usually provides only an alarm

function

Low lube oil pressure shyLow oil pressure or loss of oil pressure can destroy an engine in

short



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order Therefore most medium to larger engines will stop upon lowor

loss of oil pressure Loss of oil pressure can result in the engineseizing

due to lack of lubrication Engines with mechanicalshyhydraulicgovernors

will also stop due to the lack of oil to the governorThe oil pressure sensor usually stops the engine The oil pressure

sensorson larger engines usually have two low pressure setpoints One

setpointprovides early warning of abnormal oil pressure an alarm function

onlyThe second setpoint can be set to shutdown the engine before

permanentdamage is done

High crankcase pressure shy High crankcase pressure is usually caused by excessive blowshyby

(gaspressure in the cylinder blowing by the piston rings and into thecrankcase) The high pressure condition indicates the engine is in

poorcondition The high crankcase pressure is usually used only as an

alarmfunction

Most midshysized to large diesel engines have (as a minimum) thefollowing

protective alarms and tripsEngine overspeed alarmtrip

High water jacket temperature alarmHigh exhaust temperature alarm

Low lube oil pressure (alarm andor trip)High crankcase pressure alarm



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Saqib Malik middotInternee Engineer at Agritech (Formerly Pak American Fertilizers) Limited

unsatisfactoryLike middot Reply middot Aug 27 2015 357am

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Adpowerae said

Excellent Post About Emergency MELTDOWN Generators Shutdown and dubai dieselgenerator parts

June 8 2015 at 1224 PM



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Search here

Popular Posts

Marine Books Free Download

Difference between safety valve and reliefvalve

mmd exam results webpage

safety oral KUNDRA

MEOshyClassshy4shyOralshyandshyWrittenshyQuestions

it to travel to the noshyfuel position or it can override the governor anddirectly trip the fuel rack to the noshyfuel position

Water jacket shyWatershycooled engines can overheat if the cooling water system fails

toremove waste heat Removal of the waste heat prevents the engine

fromseizing due to excessive expansion of the components under a hightemperature condition The cooling water jacket is commonly where

thesensor for the cooling water system is located

The water jacket temperature sensors provide early warning ofabnormal

engine temperature usually an alarm function only The setpoint isset

such that if the condition is corrected in a timely manner significantengine damage will be avoided But continued engine operation at

thealarm temperature or higher temperatures will lead to engine

damage

Exhaust temperatures shyIn a diesel engine exhaust temperatures are very important and can provide a vast amount of information regarding the operation of theengine High exhaust temperature can indicate an overloading of theengine or possible poor performance due to inadequate scavenging

(thecooling effect) in the engine Extended operation with high exhausttemperatures can result in damage to the exhaust valves piston

andcylinders The exhaust temperature usually provides only an alarm

function

Low lube oil pressure shyLow oil pressure or loss of oil pressure can destroy an engine in

short






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INERT GAS SYSTEM



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Adpowerae said


June 8 2015 at 1224 PM



shyshygt

Apr (19)

Mar (8)

Jan (13)

2011 (93)

2010 (51)








Archive 2013 (50)

2012 (831)

Dec (147)

Nov (26)

Oct (95)

Sep (60)

Aug (53)


















alarmfunction























Bharatiyulam



is it used


















34 Comments Sort by




Top

Add a comment



















INERT GAS SYSTEM



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May (107)

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Adpowerae said


June 8 2015 at 1224 PM



shyshygt

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2010 (51)





















Bharatiyulam



is it used


















34 Comments Sort by




Top

Add a comment



















INERT GAS SYSTEM



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Adpowerae said


June 8 2015 at 1224 PM



shyshygt

Apr (19)

Mar (8)

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2010 (51)





is it used


















34 Comments Sort by




Top

Add a comment



















INERT GAS SYSTEM



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1 comments

Post a Comment

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1Like Share

Adpowerae said


June 8 2015 at 1224 PM



shyshygt

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2011 (93)

2010 (51)




















INERT GAS SYSTEM



Jul (80)

Jun (223)

May (107)

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1 comments

Post a Comment

Home

1Like Share

Adpowerae said


June 8 2015 at 1224 PM



shyshygt

Apr (19)

Mar (8)

Jan (13)

2011 (93)

2010 (51)





shyshygt

Apr (19)

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2011 (93)

2010 (51)



a diesel engine protection systems and alarms _ marine notes

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