NYC HIGH PRESSURE BOILER FINAL PAPER QUESTIONS
AND SOLUTIONS 2025/2026 GRADED A+
✔✔What installing an expansion tank what factor is taken in to consideration? - ✔✔The
MAWP of the boiler system
✔✔If you are reading 12% Co2 what does it pertain to? - ✔✔Incomplete combustion
✔✔When should you inspect expansion joints? - ✔✔Weekly
✔✔How far does a pressure tank need to be away from any gas services? - ✔✔5 feet
horizontal
✔✔Where is the remote disconnect located? What is it labeled? - ✔✔At the egress,
remote control for burner
✔✔What range of gage magnitude of 3 psig shall not exceed? - ✔✔1/10" increments @
4.5 psig to 6 psig
✔✔What is the minimum face size of a non mercury gage? - ✔✔2-1/4"
✔✔How many complete turns for a slow opening valve to go from full close to full open?
- ✔✔5 360* turns
✔✔What is the size pipe of the surface blow off? - ✔✔2-1/2" max
✔✔What is the pipe size of a gage cock connection? - ✔✔1/2"
✔✔How many gage cocks are needed if a boiler is not over 36" in diameter and does
not exceed 100 sq ft of heating surface? - ✔✔2
✔✔How do you protect a bottom blow off pipe when exposed to direct furnace heat? -
✔✔Fire brick
✔✔Who has prior approval by the D.O.B when an eminent health or safety hazard
happens? - ✔✔Professional Engineer
✔✔If a muffler is installed on a safety or relief valve the function is to? - ✔✔Prevent
back pressure on a boiler
✔✔What do you do when adding a new tube to a boiler? Water tube boiler? Fire tube
boiler? - ✔✔Roll and expand, water = roll and flare, fire = roll and bead
,✔✔Prior to the clean air act what were boiler operations concerned with? - ✔✔Sulfur
dioxide
✔✔What standard is plastic pipe/pvc in hydronic systems held to? - ✔✔ASTM
✔✔What boiler should be used for hot water? - ✔✔A low pressure hot water boiler
operating at a max of 120*F
✔✔what is potable water? - ✔✔drinking water
✔✔what is the flame index of insulation? - ✔✔25 flame index
✔✔what is the flame spread index of smoke density? - ✔✔450 smoke index
✔✔what are the allowed tapings of a water column? - ✔✔feed water regulator, damper
regulator, drain, steam gage
✔✔what is the seat of a safety valve composed of? - ✔✔high pressure is stainless, low
pressure is bronze/stainless
✔✔what is the minimum reading of a digital gage? - ✔✔1/100 of a psig
✔✔where do you find the maximum setting for the safety and relief valve? - ✔✔the
nameplate of the safety and pressure relief valve
✔✔how many water gage glasses are needed over 400 psig boilers? - ✔✔2
✔✔there must be ___ gage cocks within the visible length of the water glass. - ✔✔3
visible
✔✔when will the LWCO trip? - ✔✔a 1/4" below the lowest permissible water level given
by the company who installed the LWCO
✔✔what pressure do you hydrostatically test a 400 psi boiler? - ✔✔600 psi
✔✔a boiler operates at 300 psi, it is tested once ___? - ✔✔once a month and pressure
tested annually
✔✔when a safety valve is replaced what is different? - ✔✔shall be equal to the last
valve installed
✔✔what pressure will a safety valve lift completely? - ✔✔3%
✔✔safety valves shall be set at? - ✔✔the MAWP
, ✔✔what kind of valve is located between the boiler and a safety valve? - ✔✔none
✔✔where no mechanical feed is attached to a boiler what is the safety valve set
pressure? - ✔✔6%
✔✔PEX conforms to - ✔✔ASME
✔✔Where shall a pressure relief valve be installed on a Hydronic piping system that has
been
reduced in pressure? - ✔✔on the low pressure side of the system
✔✔what size is the overflow on an open type of expansion tank? - ✔✔1"
✔✔what size is the inspectors test gage connection? - ✔✔1/4"
✔✔where is the test gage connected to? - ✔✔shall be connected to the boiler
✔✔brazed joints use a filler metal that conforms to AWS A_._? - ✔✔AWS A5.8
✔✔pipe insulation shall have a maximum flame spread of? - ✔✔25 flame spread index
✔✔where does the gaseous waste of a boiler combustion go? - ✔✔should be equipped
with means for conducting products of combustion outside to the atmosphere
✔✔you blow down the boiler every? - ✔✔daily
✔✔the boiler shall be equipped with automatic devices responsive to variations in? -
✔✔steam pressure
✔✔what are all the specs of a non mercury gage of magnitude of 3 psig? - ✔✔has a
min of a 2-1/4" gage, dial arc 270*, minimum increments of 1/10 psig, shutoff cock,
indicating point at zero and has a calibration screw.
✔✔what are all the specs of a non mercury gage of magnitude of 5 psig? - ✔✔has a
min of a 2-1/4" gage, dial arc 270*, minimum increments of 1/5 psig, shutoff cock,
indicating point at zero and has a calibration screw.
✔✔a boiler operates at 100 psig, how many fusible plugs are there? - ✔✔1 fusible plug
(over 50 sq ft)
✔✔a boiler operating at 100 psi mawp, how are pipes joined together? - ✔✔flanged or
welded
AND SOLUTIONS 2025/2026 GRADED A+
✔✔What installing an expansion tank what factor is taken in to consideration? - ✔✔The
MAWP of the boiler system
✔✔If you are reading 12% Co2 what does it pertain to? - ✔✔Incomplete combustion
✔✔When should you inspect expansion joints? - ✔✔Weekly
✔✔How far does a pressure tank need to be away from any gas services? - ✔✔5 feet
horizontal
✔✔Where is the remote disconnect located? What is it labeled? - ✔✔At the egress,
remote control for burner
✔✔What range of gage magnitude of 3 psig shall not exceed? - ✔✔1/10" increments @
4.5 psig to 6 psig
✔✔What is the minimum face size of a non mercury gage? - ✔✔2-1/4"
✔✔How many complete turns for a slow opening valve to go from full close to full open?
- ✔✔5 360* turns
✔✔What is the size pipe of the surface blow off? - ✔✔2-1/2" max
✔✔What is the pipe size of a gage cock connection? - ✔✔1/2"
✔✔How many gage cocks are needed if a boiler is not over 36" in diameter and does
not exceed 100 sq ft of heating surface? - ✔✔2
✔✔How do you protect a bottom blow off pipe when exposed to direct furnace heat? -
✔✔Fire brick
✔✔Who has prior approval by the D.O.B when an eminent health or safety hazard
happens? - ✔✔Professional Engineer
✔✔If a muffler is installed on a safety or relief valve the function is to? - ✔✔Prevent
back pressure on a boiler
✔✔What do you do when adding a new tube to a boiler? Water tube boiler? Fire tube
boiler? - ✔✔Roll and expand, water = roll and flare, fire = roll and bead
,✔✔Prior to the clean air act what were boiler operations concerned with? - ✔✔Sulfur
dioxide
✔✔What standard is plastic pipe/pvc in hydronic systems held to? - ✔✔ASTM
✔✔What boiler should be used for hot water? - ✔✔A low pressure hot water boiler
operating at a max of 120*F
✔✔what is potable water? - ✔✔drinking water
✔✔what is the flame index of insulation? - ✔✔25 flame index
✔✔what is the flame spread index of smoke density? - ✔✔450 smoke index
✔✔what are the allowed tapings of a water column? - ✔✔feed water regulator, damper
regulator, drain, steam gage
✔✔what is the seat of a safety valve composed of? - ✔✔high pressure is stainless, low
pressure is bronze/stainless
✔✔what is the minimum reading of a digital gage? - ✔✔1/100 of a psig
✔✔where do you find the maximum setting for the safety and relief valve? - ✔✔the
nameplate of the safety and pressure relief valve
✔✔how many water gage glasses are needed over 400 psig boilers? - ✔✔2
✔✔there must be ___ gage cocks within the visible length of the water glass. - ✔✔3
visible
✔✔when will the LWCO trip? - ✔✔a 1/4" below the lowest permissible water level given
by the company who installed the LWCO
✔✔what pressure do you hydrostatically test a 400 psi boiler? - ✔✔600 psi
✔✔a boiler operates at 300 psi, it is tested once ___? - ✔✔once a month and pressure
tested annually
✔✔when a safety valve is replaced what is different? - ✔✔shall be equal to the last
valve installed
✔✔what pressure will a safety valve lift completely? - ✔✔3%
✔✔safety valves shall be set at? - ✔✔the MAWP
, ✔✔what kind of valve is located between the boiler and a safety valve? - ✔✔none
✔✔where no mechanical feed is attached to a boiler what is the safety valve set
pressure? - ✔✔6%
✔✔PEX conforms to - ✔✔ASME
✔✔Where shall a pressure relief valve be installed on a Hydronic piping system that has
been
reduced in pressure? - ✔✔on the low pressure side of the system
✔✔what size is the overflow on an open type of expansion tank? - ✔✔1"
✔✔what size is the inspectors test gage connection? - ✔✔1/4"
✔✔where is the test gage connected to? - ✔✔shall be connected to the boiler
✔✔brazed joints use a filler metal that conforms to AWS A_._? - ✔✔AWS A5.8
✔✔pipe insulation shall have a maximum flame spread of? - ✔✔25 flame spread index
✔✔where does the gaseous waste of a boiler combustion go? - ✔✔should be equipped
with means for conducting products of combustion outside to the atmosphere
✔✔you blow down the boiler every? - ✔✔daily
✔✔the boiler shall be equipped with automatic devices responsive to variations in? -
✔✔steam pressure
✔✔what are all the specs of a non mercury gage of magnitude of 3 psig? - ✔✔has a
min of a 2-1/4" gage, dial arc 270*, minimum increments of 1/10 psig, shutoff cock,
indicating point at zero and has a calibration screw.
✔✔what are all the specs of a non mercury gage of magnitude of 5 psig? - ✔✔has a
min of a 2-1/4" gage, dial arc 270*, minimum increments of 1/5 psig, shutoff cock,
indicating point at zero and has a calibration screw.
✔✔a boiler operates at 100 psig, how many fusible plugs are there? - ✔✔1 fusible plug
(over 50 sq ft)
✔✔a boiler operating at 100 psi mawp, how are pipes joined together? - ✔✔flanged or
welded
