NYC HIGH PRESSURE BOILER EVALUATION TEST
QUESTIONS AND SOLUTIONS 2025/2026 GRADED A+
✔✔the minimum lift ___" and a safety valve blowdown is ___% of the set pressure and
no greater than ___% and must reseat at ___% of the pressure? - ✔✔min lift is 1/16",
min safety valve blow down is 2%, fully lifted at 3% and reseats at 96% of the pressure
✔✔the popping point tolerance shall not exceed 70=?, 71-300=?, 301-1000=?, 1000+=?
- ✔✔70= 2 psig, 71-300= 3%, 301-1000= 10 psig, 1000+= 1%
✔✔all piping over 2" shall be ___ welded? - ✔✔butt welded
✔✔all piping over 2" shall be ___ welded or ___? - ✔✔socket welded or flanged
✔✔how long do you hydrostatically test a hydronic system? at a pressure not less than?
- ✔✔2 hours at no less than 100 psig
✔✔1cfm for every ___btu's in accordance with forced combustion air - ✔✔2400 btu's
✔✔who witnesses gas piping inspections? - ✔✔an authorized plumbing inspector, or
licensed PE, or master plumber, or architect
✔✔repairs to safety valves must be performed by an organization in possession of a -
✔✔National board VR (valve repair) certificate
✔✔when you roll and expand tubes how far should they extend? - ✔✔evenly 1/4", 1/2",
3/4"
✔✔a fuel regulating governor is controlled by? - ✔✔steam pressure
✔✔the lowest permissible water level in a miniature boiler is? - ✔✔1/3"
✔✔the minimum size of a feed water connection to a miniature boiler is? - ✔✔1/2"
✔✔all miniature boiler openings in the boiler shall be (construction) _____ or _____
reinforcement? how many threads? - ✔✔mechanical construction with a minimum 4
threads or welded
✔✔how many brass washout plugs are on a miniature boiler with less than 12" ID of
shell and less than 10 sq ft of heating surface? - ✔✔only 2, where one may be used as
a blow down line
, ✔✔where the brass washout plugs of miniature boilers shall be screwed into? - ✔✔on
the bottom part of the miniature boiler
✔✔a miniature boiler has less than ____ MAWP. - ✔✔less than 100 MAWP (PSI)
✔✔a miniature boiler has up to __ sq ft of heating surface. - ✔✔20 sq ft of heating
surface
✔✔a miniature boiler has up to __ cubic feet of gross volume. - ✔✔5 cubic feet of gross
volume
✔✔a miniature boiler has up to __" of ID of shell? - ✔✔16" inner diameter
✔✔any mouth protector on a boiler shall be locked or sealed ____, what type? -
✔✔locked or sealed open, of the straight way type
✔✔when are fusible plugs replaced? - ✔✔annually
✔✔when a discharge pipe is used on a safety valve it shall be ____(size) of the safety
valve, and fitted with an _____ drain? - ✔✔no less than the same size, fitted with an
open drain
✔✔three different ways to check the safety valve capacity? - ✔✔accumulation test,
maximum amount of fuel burned, maximum evaporative capacity of feed water
✔✔if a boiler has a lap seal crack it shall be? - ✔✔discontinued
✔✔what is stamped on a boiler? - ✔✔serial #, name of manufacturer, serial # of
manufacturer, MAWP, heating surface, year built, and rated steam capacity
✔✔what is stamped on a boiler identification plate? - ✔✔name, ID#, class, tensile
strength (according to high pressure code)
✔✔safety valves are ____ or held by a ____ during a hydrostatic test? - ✔✔removed or
approved clamp
✔✔if a boiler is gravity fed, there shall be what valves on the line? - ✔✔a stop valve as
close as the boiler as possible followed by a check valve
✔✔what must you not adjust on the safety valve during a hydrostatic test? - ✔✔the
compression screw
QUESTIONS AND SOLUTIONS 2025/2026 GRADED A+
✔✔the minimum lift ___" and a safety valve blowdown is ___% of the set pressure and
no greater than ___% and must reseat at ___% of the pressure? - ✔✔min lift is 1/16",
min safety valve blow down is 2%, fully lifted at 3% and reseats at 96% of the pressure
✔✔the popping point tolerance shall not exceed 70=?, 71-300=?, 301-1000=?, 1000+=?
- ✔✔70= 2 psig, 71-300= 3%, 301-1000= 10 psig, 1000+= 1%
✔✔all piping over 2" shall be ___ welded? - ✔✔butt welded
✔✔all piping over 2" shall be ___ welded or ___? - ✔✔socket welded or flanged
✔✔how long do you hydrostatically test a hydronic system? at a pressure not less than?
- ✔✔2 hours at no less than 100 psig
✔✔1cfm for every ___btu's in accordance with forced combustion air - ✔✔2400 btu's
✔✔who witnesses gas piping inspections? - ✔✔an authorized plumbing inspector, or
licensed PE, or master plumber, or architect
✔✔repairs to safety valves must be performed by an organization in possession of a -
✔✔National board VR (valve repair) certificate
✔✔when you roll and expand tubes how far should they extend? - ✔✔evenly 1/4", 1/2",
3/4"
✔✔a fuel regulating governor is controlled by? - ✔✔steam pressure
✔✔the lowest permissible water level in a miniature boiler is? - ✔✔1/3"
✔✔the minimum size of a feed water connection to a miniature boiler is? - ✔✔1/2"
✔✔all miniature boiler openings in the boiler shall be (construction) _____ or _____
reinforcement? how many threads? - ✔✔mechanical construction with a minimum 4
threads or welded
✔✔how many brass washout plugs are on a miniature boiler with less than 12" ID of
shell and less than 10 sq ft of heating surface? - ✔✔only 2, where one may be used as
a blow down line
, ✔✔where the brass washout plugs of miniature boilers shall be screwed into? - ✔✔on
the bottom part of the miniature boiler
✔✔a miniature boiler has less than ____ MAWP. - ✔✔less than 100 MAWP (PSI)
✔✔a miniature boiler has up to __ sq ft of heating surface. - ✔✔20 sq ft of heating
surface
✔✔a miniature boiler has up to __ cubic feet of gross volume. - ✔✔5 cubic feet of gross
volume
✔✔a miniature boiler has up to __" of ID of shell? - ✔✔16" inner diameter
✔✔any mouth protector on a boiler shall be locked or sealed ____, what type? -
✔✔locked or sealed open, of the straight way type
✔✔when are fusible plugs replaced? - ✔✔annually
✔✔when a discharge pipe is used on a safety valve it shall be ____(size) of the safety
valve, and fitted with an _____ drain? - ✔✔no less than the same size, fitted with an
open drain
✔✔three different ways to check the safety valve capacity? - ✔✔accumulation test,
maximum amount of fuel burned, maximum evaporative capacity of feed water
✔✔if a boiler has a lap seal crack it shall be? - ✔✔discontinued
✔✔what is stamped on a boiler? - ✔✔serial #, name of manufacturer, serial # of
manufacturer, MAWP, heating surface, year built, and rated steam capacity
✔✔what is stamped on a boiler identification plate? - ✔✔name, ID#, class, tensile
strength (according to high pressure code)
✔✔safety valves are ____ or held by a ____ during a hydrostatic test? - ✔✔removed or
approved clamp
✔✔if a boiler is gravity fed, there shall be what valves on the line? - ✔✔a stop valve as
close as the boiler as possible followed by a check valve
✔✔what must you not adjust on the safety valve during a hydrostatic test? - ✔✔the
compression screw
