Texas Boiler Inspector Licensing Exam Test
Questions And Correct Answers (Verified
Answers) Plus Rationales 2026 Q&A
What is the MAWP threshold for requiring 2 gage glasses? - CORRECT ANSWER-MAWP > 400 psi
What are the requirements for boilers with bare tube heating surface over 500 ft^2? - CORRECT
ANSWER-2 safety relief valves
2 sources of feedwater, one needs to be a pump/injector
(T/F) A gage glass can be replaced by 2 remote level indicators at operating level. - CORRECT
ANSWER-True
What is the minimum size of a connection point for a gage glass? - CORRECT ANSWER-1/2 inch
Who in the Texas Department of Licensing & Regulation (Henceforth referred to as TDLR) has
authorization to condemn boilers? - CORRECT ANSWER-Chief inspector, deputy inspector,
executive director
When no feedwater pump is present what is the requirement for SRV set pressure? - CORRECT
ANSWER-94% of lowest supply pressure
Water column drain and blowdown pipe minimum diameter? - CORRECT ANSWER-3/4 inch
(T/F) It is acceptable for gage glass material to become clouded and opaque after being
installed. - CORRECT ANSWER-False
, What is the correct metal temperature range for a pressure test? - CORRECT ANSWER-60F -
120F
The minimum gage glass cleaning hole size is _____. - CORRECT ANSWER-1/4 inch
What are the requirements for a pressure test? (Hint: duration, pressure related to working
pressure, pressure related to stress) - CORRECT ANSWER-15 minutes, 1.5x MAWP, 90% specific
yield
All exit doors must open _____. - CORRECT ANSWER-Outward
How often must carbon monoxide calibration occur? - CORRECT ANSWER-Every 18 months
What carbon monoxide level should trip an interlocking CO sensor? - CORRECT ANSWER-50
ppm
What are the allowed types of cocks on a blowdown pipe? - CORRECT ANSWER-Gland & guard
Minimum metal requirements for blowdown piping. - CORRECT ANSWER-Steel, schedule 80 or
higher
What types of metal can be used for fittings between the boiler and the blowdown valve? -
CORRECT ANSWER-Steel & extra heavy malleable iron
(T/F) Expansion tanks are necessary for high temperature boilers but not for hot water heating
systems. - CORRECT ANSWER-False
Questions And Correct Answers (Verified
Answers) Plus Rationales 2026 Q&A
What is the MAWP threshold for requiring 2 gage glasses? - CORRECT ANSWER-MAWP > 400 psi
What are the requirements for boilers with bare tube heating surface over 500 ft^2? - CORRECT
ANSWER-2 safety relief valves
2 sources of feedwater, one needs to be a pump/injector
(T/F) A gage glass can be replaced by 2 remote level indicators at operating level. - CORRECT
ANSWER-True
What is the minimum size of a connection point for a gage glass? - CORRECT ANSWER-1/2 inch
Who in the Texas Department of Licensing & Regulation (Henceforth referred to as TDLR) has
authorization to condemn boilers? - CORRECT ANSWER-Chief inspector, deputy inspector,
executive director
When no feedwater pump is present what is the requirement for SRV set pressure? - CORRECT
ANSWER-94% of lowest supply pressure
Water column drain and blowdown pipe minimum diameter? - CORRECT ANSWER-3/4 inch
(T/F) It is acceptable for gage glass material to become clouded and opaque after being
installed. - CORRECT ANSWER-False
, What is the correct metal temperature range for a pressure test? - CORRECT ANSWER-60F -
120F
The minimum gage glass cleaning hole size is _____. - CORRECT ANSWER-1/4 inch
What are the requirements for a pressure test? (Hint: duration, pressure related to working
pressure, pressure related to stress) - CORRECT ANSWER-15 minutes, 1.5x MAWP, 90% specific
yield
All exit doors must open _____. - CORRECT ANSWER-Outward
How often must carbon monoxide calibration occur? - CORRECT ANSWER-Every 18 months
What carbon monoxide level should trip an interlocking CO sensor? - CORRECT ANSWER-50
ppm
What are the allowed types of cocks on a blowdown pipe? - CORRECT ANSWER-Gland & guard
Minimum metal requirements for blowdown piping. - CORRECT ANSWER-Steel, schedule 80 or
higher
What types of metal can be used for fittings between the boiler and the blowdown valve? -
CORRECT ANSWER-Steel & extra heavy malleable iron
(T/F) Expansion tanks are necessary for high temperature boilers but not for hot water heating
systems. - CORRECT ANSWER-False
