NYC HIGH PRESSURE BOILER QUESTIONS AND SOLUTIONS
2025/2026 GRADED A+
✔✔centrifugal pump has which characteristics? - ✔✔radial flow, mixed flow, axial flow
✔✔how are safeties tested on a new boiler? - ✔✔pressurized with high pressure gas,
Pressurized with water (hydro test), pressurized with steam
✔✔how do you calculate the moisture in steam? - ✔✔calorimeter
✔✔what is added to water in DA? - ✔✔di phosphate, tri phosphate, sodium sulfite,
sodium hydroxide
✔✔pipes not covered by code? - ✔✔clay
✔✔5/16" tube thickness w/ no bevel or recess should extend how far past tube sheet? -
✔✔3/8", 5/16", 1/2" (code says at least same as pipe thickness)
✔✔what is this formula used for?
(TS x t x E) / (R x FS) - ✔✔MAWP, boiler horsepower
✔✔(TS x t x E) / (R x FS)
TS = - ✔✔tensile strength of shell plates
✔✔(TS x t x E) / (R x FS)
t = - ✔✔thickness of shell plate
✔✔(TS x t x E) / (R x FS)
E = - ✔✔efficiency of longitudinal joint
✔✔(TS x t x E) / (R x FS)
R = - ✔✔inside radius of weakest course of shell or drum
✔✔(TS x t x E) / (R x FS)
FS = - ✔✔factor of safety allowed by this subpart
✔✔importance of water column? - ✔✔To get steam temp, pressure, boiler level, to
attach glass gage so that level can be read easily
✔✔why we blowdown water column? - ✔✔ensure proper level reading, remove
sediments
, ✔✔low water level in boiler causes? - ✔✔overheating of tubes, steam surging
✔✔bad water treatment and scaling would most effect? - ✔✔shutdown and startup,
cycling and base load
✔✔purpose of safety valve on outlet of superheater? - ✔✔
✔✔what happens to DA when returning condensate is hotter than should be? -
✔✔steam bypass closes, sprayers close, safety pops, vacuum breaker opens
✔✔how does DA remove non-condensables from water? - ✔✔Centrifugal force,
differential between water and steam, spraying and heating water
✔✔Before the clean air act, concerned with? - ✔✔Particulate matter, sulfur dioxide,
CO2
✔✔at what pressure is a fusible plug NOT needed? - ✔✔under 200 psi
✔✔type of welding required on a 4" pipe - ✔✔butt weld
✔✔what type of plastic pipe permits for use for stab type insertion joints? -
✔✔polyethylene plastic pipe and tubing for ground source heat pump loop systems
✔✔renewable energy or fuel? - ✔✔more expensive; 13% electric generation
✔✔Which plant does not use steam in its electrical process? - ✔✔Hydroelectric
✔✔valve body of cast iron is permitted when? - ✔✔Never on high temp water boilers.
Cast iron blow off cocks allowed under 200 psi if not a htwb.
✔✔what protects the boiler from expansion and contraction of steam mains connected
to boiler? - ✔✔expansion joints
✔✔Used pipe, fittings, valves or other materials can be reused under what
circumstances? - ✔✔If clean and free of foreign materials
✔✔How does an open feedwater heater remove oxygen? - ✔✔Tray deaerator: Spray
deaerator: mixed tray-spray
✔✔what type of joint is used for passing pipe to boiler? - ✔✔flange
2025/2026 GRADED A+
✔✔centrifugal pump has which characteristics? - ✔✔radial flow, mixed flow, axial flow
✔✔how are safeties tested on a new boiler? - ✔✔pressurized with high pressure gas,
Pressurized with water (hydro test), pressurized with steam
✔✔how do you calculate the moisture in steam? - ✔✔calorimeter
✔✔what is added to water in DA? - ✔✔di phosphate, tri phosphate, sodium sulfite,
sodium hydroxide
✔✔pipes not covered by code? - ✔✔clay
✔✔5/16" tube thickness w/ no bevel or recess should extend how far past tube sheet? -
✔✔3/8", 5/16", 1/2" (code says at least same as pipe thickness)
✔✔what is this formula used for?
(TS x t x E) / (R x FS) - ✔✔MAWP, boiler horsepower
✔✔(TS x t x E) / (R x FS)
TS = - ✔✔tensile strength of shell plates
✔✔(TS x t x E) / (R x FS)
t = - ✔✔thickness of shell plate
✔✔(TS x t x E) / (R x FS)
E = - ✔✔efficiency of longitudinal joint
✔✔(TS x t x E) / (R x FS)
R = - ✔✔inside radius of weakest course of shell or drum
✔✔(TS x t x E) / (R x FS)
FS = - ✔✔factor of safety allowed by this subpart
✔✔importance of water column? - ✔✔To get steam temp, pressure, boiler level, to
attach glass gage so that level can be read easily
✔✔why we blowdown water column? - ✔✔ensure proper level reading, remove
sediments
, ✔✔low water level in boiler causes? - ✔✔overheating of tubes, steam surging
✔✔bad water treatment and scaling would most effect? - ✔✔shutdown and startup,
cycling and base load
✔✔purpose of safety valve on outlet of superheater? - ✔✔
✔✔what happens to DA when returning condensate is hotter than should be? -
✔✔steam bypass closes, sprayers close, safety pops, vacuum breaker opens
✔✔how does DA remove non-condensables from water? - ✔✔Centrifugal force,
differential between water and steam, spraying and heating water
✔✔Before the clean air act, concerned with? - ✔✔Particulate matter, sulfur dioxide,
CO2
✔✔at what pressure is a fusible plug NOT needed? - ✔✔under 200 psi
✔✔type of welding required on a 4" pipe - ✔✔butt weld
✔✔what type of plastic pipe permits for use for stab type insertion joints? -
✔✔polyethylene plastic pipe and tubing for ground source heat pump loop systems
✔✔renewable energy or fuel? - ✔✔more expensive; 13% electric generation
✔✔Which plant does not use steam in its electrical process? - ✔✔Hydroelectric
✔✔valve body of cast iron is permitted when? - ✔✔Never on high temp water boilers.
Cast iron blow off cocks allowed under 200 psi if not a htwb.
✔✔what protects the boiler from expansion and contraction of steam mains connected
to boiler? - ✔✔expansion joints
✔✔Used pipe, fittings, valves or other materials can be reused under what
circumstances? - ✔✔If clean and free of foreign materials
✔✔How does an open feedwater heater remove oxygen? - ✔✔Tray deaerator: Spray
deaerator: mixed tray-spray
✔✔what type of joint is used for passing pipe to boiler? - ✔✔flange
