25 Questions
What are outlet connections in a boiler used for?
Connecting external piping and fittings
What is the technical jurisdiction of ASME B31.1 Power Piping Code?
Boiler external piping
According to ASME B31.1, what is required when two or more boilers are connected to a common header?
Two stop valves with an ample free-blow drain between them
What is the purpose of continuous blowdown in a boiler?
To remove sludge and sediment from the bottom of the boiler
How are fittings and piping usually attached to a boiler drum or shell?
By welding directly to the drum or shell
What falls under the technical jurisdiction of ASME BPVC I regarding boiler piping systems?
Boiler piping system configuration
According to ASME B31.1 Power Piping Code, what is the purpose of the check valve in the feedwater piping for all boilers?
To prevent the boiler from draining through the feedwater line when a boiler feedwater pump is not running
Why are slow-opening blowoff valves required for boilers with allowable working pressures over 100 psig (690 kPag), according to ASME B31.1 Power Piping Code?
To reduce thermal shock with a gradual, controlled warm-up of the blowoff line
Which type of valve is prohibited from blowoff service according to ASME B31.1 Power Piping Code?
Globe valve
What is required for all stop valves according to ASME BPVC IV Part HG-710.4(b)?
Suitable pressure and temperature rating
According to ASME B31.1 Power Piping Code, which type of valves are preferred for steam shut-off valves in boilers?
Gate valves
What type of boilers are exempt from the two-valve rule for blowoff valves according to ASME B31.1 Power Piping Code?
Traction and portable boilers
What is the minimum reading required for the thermometer?
20°C
What is the normal operating pressure for the hot water boiler?
900 kPa
What type of valves are required in the supply and return pipe connections on all hot water heating boilers?
Stop valves
What is the purpose of the expansion tank in a heating system?
To provide storage space for excess water due to expansion
Under what conditions are stop valves not required in hot water heating boilers?
When the system can be drained without draining the boiler
What is the minimum hydrostatic test pressure required for expansion tanks in systems designed for a working pressure of 200 kPa or less?
520 kPa
What are open expansion tanks often limited to?
Systems with a maximum water temperature of 80°C
What is the minimum required pressure rating for valves used to blowoff or drain low-pressure steam boilers, according to ASME BPVC IV?
200 kPa (30 psi)
Why is it recommended to use outside screw and yoke valves with rising spindles for a steam outlet that is DN 50 (2” NPS) or larger?
To prevent corrosion from steam or water exposure
Why should the feedwater connection be arranged so that the water does not discharge directly against surfaces exposed to hot combustion gases or radiant heat from the fire?
To avoid damaging the feedwater connection
What is the purpose of a check valve near the boiler in pumped return systems?
To prevent the boiler from draining when the boiler feedwater pump is off
What is the purpose of a bottom blowoff connection in steam heating boilers, according to ASME BPVC IV?
To allow for intermittent removal of sediment from the water column and gauge glass
What is required by ASME BPVC IV on every hot water heating boiler?
All of the above
Test your knowledge of boiler valve and cock requirements with this quiz. It covers the minimum pressure and temperature ratings, as well as the recommended valve types for steam outlets of DN 50 (2” NPS) or larger.
Make Your Own Quizzes and Flashcards
Convert your notes into interactive study material.
Get started for free
