15 Questions
What is the purpose of outlet connections in a boiler?
To connect the boiler to various controls, instruments, or fittings
How can fittings and piping be attached to the boiler?
Welded directly to the drum or shell
What falls under 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?
Fitting with two stop valves having an ample free-blow drain between them
In Figure 6 described in ASME B31.1, what does Boiler #1 have?
A small steam drum and is only equipped with a handhole
What is the purpose of the check valve in the feedwater piping for boilers?
To prevent the boiler from draining through the feedwater line when the boiler feedwater pump is not running.
According to ASME B31.1, what type of valves are preferred for the required steam shut-off valves?
Outside screw and yoke, rising stem valves
When two or more boilers are fed from a common source, what is required in the branch to each boiler?
Globe or regulating valve located between the check valve and the source of supply
What is the required valve type for blowoff service according to ASME B31.1?
Y-type globe valves
What is the rationale behind requiring slow-opening blowoff valves for boilers with allowable working pressures over 100 psig (690 kPag)?
To reduce wear on one valve by allowing it to operate in non-moving fluid
What is the minimum pressure rating required for all valves or cocks in a boiler?
Not less than 120°C
Why is it recommended to use outside screw and yoke valves with rising spindles for steam outlets DN 50 or larger?
To enable visibility of valve position from a distance
Where should the feedwater connection be arranged to enter the boiler?
Internally using a pipe to direct the water to a suitable point
What does ASME BPVC IV Part HG-705(a) state about introducing feedwater through openings or connections provided for inspection or cleaning, safety valve, water column, water gage glass, or pressure gage?
It should be avoided as it could affect the operation of feeders, cut-offs, or the safety valve
Why is a check valve installed near the boiler in the feedwater pipe?
To prevent backflow and keep the boiler from draining when the boiler feedwater pump is off
Test your knowledge on the connections in a boiler drum or shell for external piping and fittings, including safety valves, main steam stop valves, feedwater inlets, and pressure controls.
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