GENERAL QUESTION

1What is the purpose of the balance line in a center fugal compressor ? For any leak from the seal will equalize the pressure to suction and avoid exile displacement . 2What is the type of incident ? Minor , Major , war , Heavy rain , Earth quake . 3MIPP Major Incidents Procedure Plant incidents category :12345Initial call cut Miner Category 1 Category 2 Category 3

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Heat / Ex leak internally how ?

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Tube sheet gasket damaged . Tube sheet gasket welded joint corroded . tube corroded .

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High pressure exchanger flange got fire unable to extinguished ?

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First we will fix steam hose . Try to reduce inlet product . Try to isolate it if it possible .

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Shut down corried out to avoid big fire .

What is ( NPSH ) what happen if it is low ? Net positive suction head deferent at the pump suction due to high of liquid column , and if it's low pump will cavition ( loosing suction ) .

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When you produce cold slop and hot slop ?

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Producing cold slop during unit start up Producing hot slop during unit normal running

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A vassal with H / C and H2S , to be handed to M / D for internal , inspection what you do ?

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Isolated Drained Blinded Steam purge N2 purge Gas test , if its not free from gases filled with water and drained until gas will be free .

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Safety require ments for equipment's :-

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Electrically isolated Inspection tested Isolated from gas , air , steam

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Drained Blinded Water flushed , steamed Severs , drain vapor covered tight Ventilated , gas freed Vehicle / equipment in good condition with spare arrester

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What is Protection measures ?

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Protective clothing Eye goggles / face protection Welder / gas cutter shall wear full protection Safety belt and life line Breathing apparatus Cover with tarpaulin Remove flammable materials

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What is the flash point ? The temp. which the ignition takes place for inflammable material .

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What is the fire point ? The temp. which in flammable material start to burn continuously .

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What is the smoke point ? The point which liquid will start smoking .

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What is the freezing point ? The point which liquid become solid .

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What is the critical temp. ? The minimum temp. required to start reaction .

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What is the critical pres. ? The minimum pres. required to start reaction .

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What is the dew point ? The dew point is the lowest temp. for gas when start cooling .

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What is the exothermic ? The exothermic is the reaction given heat

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What is the endo thermic ? The endo thermic is the reaction absorbing heat .

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What is the absorption ? The absorption is the a chemical process .

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What is the adsorption ? The adsorption is the a physical process .

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What is the corrosion ? The corrosion is a chemical reaction .

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What is the errosion ? The errosion is a physical reaction .

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What is IHP ? IHP is indicator horse power .

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What is RLC ?

RLC is running load currant . 26 What is DP cell ? DP cell is working in adefrant pressure . Hydrogen sulfide if it's very low concentration it's can be detected by smell ? Hydrogen sulfide can be detected by smell even 0.1 % concentration . 28 When and how you do hot tapping ? It can be during unit running and on live line . Weld a piece of line with flange and fix the valve at close position then fix the hot tapping machine then start opening the valve and start hot taping operation . 29 When you issue hot permit and what you do ? For welding job and grinding also for x - ray and inspection and Buffing , sand blasting , jack hummer and vehicle entry . Fire station and safety to be informed while there is a welding job . 30 When you have PSV backed from W / shop for installing what you do ? Check the tag No and the set point of pressure and check the lest renewal date , should be fix on right place and right equipment , blind to be removed and isolation valve should be on open position and car sealed , work shop certificate to be sign and filed . 31 What is latent heat ? The latent is the heat given out or observed when change of state substance from liquid to vapor or vapor to liquid . 32 What is sensible heat ? The sensible heat is the heat given out or observed with out change of state substance change . 33 What is LEL ?

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LEL is lower explosive limit The lows concentration of gas in atmosphere which will cause explosion when source of heat is given. 34 What is UEL ? UEL is upper explosive limit The height concentration of gas in atmosphere which will not cause explosion when source of heat is given . 35 What is LFL ? LFL is lower flammable limit The lowest concentration of gas in atmosphere with will catch fire when source of heat is given . 36 What is UFL ? UFL is upper flammable limit The highest concentration of gas in atmosphere which will not catch fire when source of heat is given . 37 What is TLV ? TLV is threchold limit value The lowest concentration of gas in which a person can remains in the area . 38 What is IBP ? IBP is initial boiling point The lowest temp. at which liquid vapor is distilated . 39 What is the allowable O2 % concentration to go inside vessel ? Allowable O2 % concentration is 19 % . 40 What is the natural draft and balance draft and force draft ? Natural draft atmospheric air from inspection doors throw long stack while damper is open . 41 What is balance draft ?

Balance draft id from flue gas section up stream of damper

suction to the blower discharging down stream of damper while damper is closed . 42 What is force draft ? Force draft is atmospheric air throw main blower discharging up stream of damper while the damper is open . 43 What is the use of draft in heaters ? Draft in heater with high stack crated vacuum if there's no vacuum causes positive press which will cause back fire , hot spot , less heat transfer , ratio well effect . 44 Where is highest transfer temp. inside heater ? ( Which section of heater ) it is on convection section . 45 What is density ? The density is the most of liquid per unit vellum at 15c kg, L . 46 What is MVI ? MVI is the medium viscosity index The rate of changing of viscosity of on oil :1247 If rate is less If rate is more ------------------------------HVI LVI

What is saturated Hydrocarbon ? Saturated hydrocarbon is single bound of Hydrogen ( less reactive )

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What is RVP ? RVP is the reid vapor pressure If stabilizer temp up and press down will down If stabilizer temp down and press up will up

the RVP + C4 the RVP + C4

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What is unsaturated hydrocarbon ? Unsaturated hydrocarbon it is double bound of hydrogen ( more reactive )

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What is 90 actane ? The 90 actane is the knock value of fuel .

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What is 150 actane ? The 150 actane is having astander knock value of 100 .

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What is API ? API is gravity American petroleum instate . it is a measure of density ( which are lighter than H2O ) gravity at temperature of 60f .

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What is SP , GR ? SP , GR are specific gravity it is measure of density ( which heavier than H2O ) ABI = 141.5 specific -131.5

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What is the meaning of too much air and too lettel execs air ? Too much air mean that loosing energy and required more fuel . Too little air mean that loosing fuel and more CO form .

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How to control the draft inside heater and where is the location of draft doors ? As much the damper is open we control the draft inside heater . Located at heater side the draft doors .

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What is the use of air pre heater in heaters ? To reduce fuel gas consumption .

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Why the compressor provided with balance line ? 1To safe the compressor from surge .

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To equalize inboard and out board pressure . To prevent high carnet load on compressor .

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Why the center fugal pump discharge provided with NRV ( check valve ) ? To safe the pump from back flow .

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Why mostly gate valve provided with by pass ? To safe the valve from damage as up stream pressure higher than down stream of the valve .

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What is rotary pump ? Rotary pump has fixed flow and pressure .

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What is centrifugal pump ? Centrifugal pump is the flow and pressure can changed with in it design it is used where velum is important than discharge pressure = flow + pressure can be changed .

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What is gear pump ? Gear pump it is used as in bulled pump for lab oil circulation for blowers and compressor discharge valve should be open .

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What is reciprocating pump ? Reciprocating pump is used for high discharge pressure required giving fix flow and pressure discharge valve should be open .

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Why high tension pumps provided with minimum flow line ? To safe the pump and discharge line .

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Why we purge the fire box in heaters before starting burners ?

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To avoid explosive To purge the Oxygen from heater .

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Why the high pressure hydrogen leak can catch fire ? the high pressure hydrogen leak can catch fire due to :12UEL concentration low Static charging of Hydrogen

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The tank provided with agauge colum to avoid :-

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Static charging Accurate level

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Why tank roof breather is provided with flame arrester ? To prevent ignition from oil side .

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Why the crude is store in floating roof tank ? To prevent light end loss in crude causes fire hazard .

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If excavation is more than one meter what you will do ? Showering shall should be carried out . If excavation is to be made in poor soil or more than 3 meters what you will do ? We should be used sheet .

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