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Which are the major causes of burn exhaust valves in any gas engines?

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Question added by Muhammad Asif Siddiqui , Assistant Engineer , K Electric
Date Posted: 2015/07/29
Tero Puupponen
by Tero Puupponen , Manager, Condition Monitoring , Amec Foster Wheeler

Wrong fuel/air - ratio, disturbed cooling water flow to water cooled exhaust gas valve seat 8speaking of big engines).

Javaid Akhtar  Rizwan
by Javaid Akhtar Rizwan , Operation Coordinator , Saudi Electricity Company

improper combustion, overheating, valve not seat properly, wear tear with passage of time, improper material. deposit build up and aging fatigue.

Muhammad Abbas
by Muhammad Abbas , Project Director , ENI

In sufficient Combustion air, Condensate in the Fuel Gas, Choking of Air Filters, sticky valves...are the main causes of burning of exhaust v/vs in gas engines...

biniam woldeyes
by biniam woldeyes , mechanical engineer , METEC

in combustion engine the force applied on piston makes chemical energy  then into usefull mechanical energy.

فضل محمد يعقوب حسين
by فضل محمد يعقوب حسين , Senior Mechanical Engineer , TOP HILL TRADING & CONTRACTING - DOHA, QATAR.

1/Anything that causes incorrect valve seal Cooling issues (improper cylinder head cooling)

2/Quality of fuel? (carbon deposit on the valves)

3/Concentration of heat at a particular point on the valve during opening (for exhaust valve) due to improper design.

GIHAD IBRAHIM
by GIHAD IBRAHIM , MECHANICAL SUPERVISOR , BGCG

I THINK THE CAUSE IS MISS ADJUSTING OR LEAKAGE  OF MAIN FUEL VALVES ACCORDING ITS LOAD AND PRECENTAGE OF COMBUSTION AIR

Shaju Puthenkudy
by Shaju Puthenkudy , Diagnostic Specialist CAT / MAK products , Zahid Tractor & H.M.Co.Ltd

Improper air fuel ratio, poor valve seat or sticking valves and or material defect, out of timing

Main reason is air /fuel ratio problem , lubricant oil is condition is very bad condition or low .Improper operation & semitalent opertors may be done

HENRY PETER JOHNSON
by HENRY PETER JOHNSON , Field Service Technician/Engineer , First Independent Power Limited a Subsidiary of Sahara Group

The cause of the exhaust burnt valve is the excessive mass flow of fuel that damaged the internal hard ware of the engine.

The valve material is absolutely design to a specific heat rate that can withstand its own specific temperature might not exceed the heat rate, if the temperature exceed it maximum heat rate it can cause damage to the internal ware. Gas fuel pressure need to be maintained at its own design temperature, heat rate, pressure base on the vintage of the unit circle parameter. Corrosion also play its own role but is minimal for inspection period. 

osama hassan mahmoud abd elnabi
by osama hassan mahmoud abd elnabi , مدير عام ووكيل وزاره , القوات المسلحه

The exhaust valve can be burned due to the occurrence of corrosion in the valve base, which acts as a non-lOCK

The exhaust valve is thicker than the exhaust valve and is made of high temperature bearing material SO IF IT MADE BY BAD MATIRIAL  IT MAY GET BURN EASLY , or it can be caused by a difference in timing, non-adjusting of tacks or non-fuel. Matching

adib zeineddine
by adib zeineddine , shift charge engineer , Mechanical section head , Ansaldo energia , Enel produzione , Kepco and YTL P.S.

escaping of cumbusion gases caused burning the edge of the valve