High Pressure Boiler Practical questions with
Correct Answers
What type of Boiler is It - Correct Answer - scotch Marine, dry back, horizontal tube, 3-pass
How do you know that it is a fire tube - Correct Answer - no drums
how many passes - Correct Answer - 3
how do you know its 3-pass - Correct Answer - breaching is in the rear
when you first come on watch what do you do. - Correct Answer - check water level,blow down water
column, gauge glass and low water cut off, reset lwco,check log book
which would you blow down first - Correct Answer - water column, gauge glass
if you cant see the water level,what do you do. - Correct Answer - shut the water at the side of the
boiler, close all steam outlets, let boiler cool
if water level is low what do you do - Correct Answer - trouble shoot the feed water pumps and feed
water control(mcdonald miller lwco)
if water level is high what do you do - Correct Answer - shut off feed water by closing valve at boiler use
surface blow downs , shut boiler off, check water level using my tri cocks, trouble shoot the pump and
feed water control.
how do you user bottom blow downs - Correct Answer - 2 man operation, 1 to watch the gauge, 1 to
operate the vaves, check to see if the slow opening vale is closed, open the quick opening valve, slowly
open the slow opening valve, 20-30secs. close the slow opening valve,close the quick opening
valve,open the slow opening valve,close the slow opening valve.
when do you blow down the boiler, - Correct Answer - remove sludge and sediememt, or once a day,
done at low load, when first starting up.
if tds were 5000 would you blow down the boiler - Correct Answer - yes tds should be between 2000-
2500(in the DA about 300)
, what is the surface blowdown for - Correct Answer - Remove scum and oil
how many low water cut offs are there - Correct Answer - 2
which LWCO completely takes out boiler and wont let it back on - Correct Answer - the one by itself on
the left side with the manual reset.
name some boiler safeties - Correct Answer - vapor stat,solenoids,LWCO,safety valves,explosion
door,high furnance pressure trip,flame detector,fuel oil fusible link, pressuretrol,proof of closure
valves,non return valve
are solenoids on the gas line safeties, - Correct Answer - yes
why are there 2 safeties on the boiler - Correct Answer - asme requires atleast 2 for heating surface
greater then 500 sq.ft.
how often do you test safety valves - Correct Answer - manually once a month, annually by raising the
pressure
how do you know the heating surface - Correct Answer - on the name plate. 1750sqft fireside
point out flame detector how does it work. - Correct Answer - the infrared light drops the resistance
across a lead sulfide cell allowing current to flow, this is picked up by the controler, if there is no flame
then there is no current
what are some oil safeties point them out, - Correct Answer - fusible link,low pressure oil switch
what are some gas safeties - Correct Answer - solenoids, high and low press gas switch, proof of closure.
Solenoids fail closed upon loss of power
what if the proof of closure valve is stuck open can the boiler light on oil. - Correct Answer - no
where is the low pressure gas cut out - Correct Answer - on the gas line before the regulator
where is the high pressure gas cut out - Correct Answer - on the gas line after the regulator
is the fuel to the burner high or low pressure - Correct Answer - after the pump at the burner about 200
psi High pressure
how is flame ignited - Correct Answer - gas pilot is ignited by an ignition transformer, Gas pilot lights the
main fuel burner
where secondary air - Correct Answer - under the burner, provides air for combustion
where is primary air - Correct Answer - comes in behind the burner,intended for turblance,to improve
combustion
waht is a vapor stat - Correct Answer - senses draft and trips boiler if primary air is lost.
Correct Answers
What type of Boiler is It - Correct Answer - scotch Marine, dry back, horizontal tube, 3-pass
How do you know that it is a fire tube - Correct Answer - no drums
how many passes - Correct Answer - 3
how do you know its 3-pass - Correct Answer - breaching is in the rear
when you first come on watch what do you do. - Correct Answer - check water level,blow down water
column, gauge glass and low water cut off, reset lwco,check log book
which would you blow down first - Correct Answer - water column, gauge glass
if you cant see the water level,what do you do. - Correct Answer - shut the water at the side of the
boiler, close all steam outlets, let boiler cool
if water level is low what do you do - Correct Answer - trouble shoot the feed water pumps and feed
water control(mcdonald miller lwco)
if water level is high what do you do - Correct Answer - shut off feed water by closing valve at boiler use
surface blow downs , shut boiler off, check water level using my tri cocks, trouble shoot the pump and
feed water control.
how do you user bottom blow downs - Correct Answer - 2 man operation, 1 to watch the gauge, 1 to
operate the vaves, check to see if the slow opening vale is closed, open the quick opening valve, slowly
open the slow opening valve, 20-30secs. close the slow opening valve,close the quick opening
valve,open the slow opening valve,close the slow opening valve.
when do you blow down the boiler, - Correct Answer - remove sludge and sediememt, or once a day,
done at low load, when first starting up.
if tds were 5000 would you blow down the boiler - Correct Answer - yes tds should be between 2000-
2500(in the DA about 300)
, what is the surface blowdown for - Correct Answer - Remove scum and oil
how many low water cut offs are there - Correct Answer - 2
which LWCO completely takes out boiler and wont let it back on - Correct Answer - the one by itself on
the left side with the manual reset.
name some boiler safeties - Correct Answer - vapor stat,solenoids,LWCO,safety valves,explosion
door,high furnance pressure trip,flame detector,fuel oil fusible link, pressuretrol,proof of closure
valves,non return valve
are solenoids on the gas line safeties, - Correct Answer - yes
why are there 2 safeties on the boiler - Correct Answer - asme requires atleast 2 for heating surface
greater then 500 sq.ft.
how often do you test safety valves - Correct Answer - manually once a month, annually by raising the
pressure
how do you know the heating surface - Correct Answer - on the name plate. 1750sqft fireside
point out flame detector how does it work. - Correct Answer - the infrared light drops the resistance
across a lead sulfide cell allowing current to flow, this is picked up by the controler, if there is no flame
then there is no current
what are some oil safeties point them out, - Correct Answer - fusible link,low pressure oil switch
what are some gas safeties - Correct Answer - solenoids, high and low press gas switch, proof of closure.
Solenoids fail closed upon loss of power
what if the proof of closure valve is stuck open can the boiler light on oil. - Correct Answer - no
where is the low pressure gas cut out - Correct Answer - on the gas line before the regulator
where is the high pressure gas cut out - Correct Answer - on the gas line after the regulator
is the fuel to the burner high or low pressure - Correct Answer - after the pump at the burner about 200
psi High pressure
how is flame ignited - Correct Answer - gas pilot is ignited by an ignition transformer, Gas pilot lights the
main fuel burner
where secondary air - Correct Answer - under the burner, provides air for combustion
where is primary air - Correct Answer - comes in behind the burner,intended for turblance,to improve
combustion
waht is a vapor stat - Correct Answer - senses draft and trips boiler if primary air is lost.
