22 Questions
Which code contains directions about the required configuration of boiler piping systems?
ASME BPVC I
What is considered as boiler external piping according to the ASME B 31.1 Power Piping Code?
Piping leading to and from a boiler up to the first valve
According to ASME B31.1 122.1.7 (A3), what should be fitted for each boiler having a manhole opening when connected to a common header?
Two stop valves with an ample free-blow drain between them
What are outlet connections in a boiler used for?
Connecting external piping and fittings
What is required for all required steam shut-off valves?
Position indicator
What is required for each feedwater line to a boiler?
Check valve and a stop valve
What is required for boilers with allowable working pressures over 100 psig (690 kPag)?
Slow-opening blowoff valves
What is required for forced circulation and electric steam boilers with a normal water content of 380 L (100 US gallons) or less?
Slow-opening blowoff valves
What is attached to a low-pressure steam boiler according to ASME B31.1?
Steam outlet stop valve, feedwater inlet stop and check valves, blowoff valves, vent valve, and water level controls
What type of valves are commonly used on the steam outlet of a boiler?
Globe or regulating valve
What is required for multiple boilers fed from a common source?
Globe or regulating valve
What is the minimum pressure rating required for all valves or cocks according to ASME BPVC IV Part HG-705(a)?
200 kPa (30 psi)
What is the recommended valve type when the steam outlet is DN 50 (2” NPS) or larger?
Outside screw and yoke valves with rising spindles
Where should the feedwater connection be arranged to enter the boiler?
Using an internal pipe to direct the feedwater to a suitable point within the boiler
What type of valve should be installed in the feedwater pipe near the boiler, according to ASME BPVC IV Part HG-705(a)?
Check valve
What does ASME BPVC IV Part HG-703.2 require in addition to the feedwater check valve?
Return (or Hartford) loop installation
Where are bottom blowoff connections required to be connected according to ASME BPVC IV Part HG-715(a)?
To the lowest water space practicable
What is the purpose of having a bottom blowoff connection at the lowest water space practicable?
To ensure the boiler can be completely drained and discharge all sediment
What is required for the blowoff discharge piping according to ASME BPVC IV Part HG-715(a)?
To be full size from the point of discharge
What type of valves are installed for intermittent removal of sediment from the water column, gauge glass, and low water fuel cutoff?
$200 kPa (30 psi) rated valves
Where are packaged firetube boilers typically have the blowoff connection located?
At the bottom of the shell close to the back end
What is used to prevent boiler pressure from lowering the boiler water level below the lowest permissible level?
Return (or Hartford) loop
Study Notes
- Boiler #1: Small steam drum, only equipped with a handhole.
- Boiler #2: Larger shell, requires a manhole for inspections and maintenance.
- Due to connection to a common steam header, Boiler #2 requires block and bleed valves in the steam line.
- If Boiler #1 had a manhole, it too would need a block and bleed system.
- Steam Line Stop Valves and Drains (ASME BPVC I): Required steam shut-off valves must be equipped with a position indicator.
- Feedwater Piping (ASME B31.1): Each feedwater line to a boiler is required to have a check valve and a stop valve.
- When multiple boilers are fed from a common source, a globe or regulating valve is required in the branch to each boiler.
- Blowoff Piping (ASME B31.1): Boilers with allowable working pressures over 100 psig (690 kPag) require two slow-opening blowoff valves.
- Traction and portable boilers, as well as forced circulation and electric steam boilers with a normal water content of 380 L (100 US gallons) or less, require only one blowoff valve.
- Miscellaneous Piping (ASME B31.1): Various fittings attached to a low-pressure steam boiler include: a steam outlet stop valve, feedwater inlet stop and check valves, blowoff valves, vent valve, and water level controls.
- Steam Outlet and Stop Valve (ASME BPVC IV): The steam produced in the boiler leaves through the steam outlet, and flows through the main header to the branch lines.
- Gate valves and globe valves are commonly used on the steam outlet of a boiler.
- Stop valves are used in the supply and return pipe connections of single and multiple boilers.
Test your knowledge of boiler connections and valves code requirements for steam boilers. Learn about the outlet connections, their functions, and the various external piping and fittings they connect to.
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