MA Boiler Operator flashcards
MA Boiler Operator · Build recall with a focused review session.
32 cards. Read the term and the definition here. The deck at the top of this page is optional.
- M.G.L. c. 146
- Massachusetts statute that establishes boiler inspection, construction, and operation requirements and authorizes the Board of Boiler Rules to adopt implementing regulations.
- 522 CMR
- Massachusetts Board of Boiler Rules regulations that implement the boiler statute and adopt ASME code requirements with state-specific amendments.
- Board of Boiler Rules
- Massachusetts board that administers boiler regulations, adopts code amendments, and issues licenses and variances for boiler operation and inspection.
- Certificate of inspection
- Document issued after a required boiler inspection showing the boiler may be operated; it must be posted and kept current.
- ASME Section I
- ASME Boiler and Pressure Vessel Code section governing construction of power boilers and high-pressure steam equipment.
- ASME Section IV
- ASME code section covering construction of heating boilers, including low-pressure steam and hot water heating boilers.
- Safety valve capacity
- Total relieving capacity of all safety valves must equal or exceed the boiler's maximum steam-generating capacity at allowable pressure.
- Blowoff valve arrangement
- Power boiler blowoff lines normally require two valves in series, one at the boiler and one downstream, to permit safe isolation.
- Three T's of combustion
- Temperature, turbulence, and time are the conditions needed to mix fuel and air and complete combustion with minimal unburned products.
- Stoichiometric air
- The exact amount of air needed to burn a fuel completely with no excess oxygen or unburned fuel.
- Excess air
- Air supplied beyond stoichiometric requirements to ensure complete combustion; typical excess oxygen is about 3 to 5 percent.
- Forced draft
- A fan supplies combustion air to the furnace under positive pressure, overcoming burner and air-side resistance.
- Pre-purge
- Before ignition, the burner management system forces air through the furnace for a set time to remove combustible gases.
- Post-purge
- After fuel shutoff, the fan continues to purge the furnace and boiler passes of unburned fuel and combustion gases.
- Modulating burner
- A burner that varies fuel and air input continuously to match load rather than cycling fully on and off.
- Bottom blowdown
- Short, frequent blows from the lowest boiler connection remove sludge and sediment; it is done at low fire.
- Low-water fuel cutoff
- A safety control that senses low water level and shuts off fuel to the burner before the boiler becomes unsafe.
- Flame safeguard
- Control system that proves pilot or main flame and closes the fuel valve if flame is lost.
- High-pressure limit switch
- A control that opens the fuel circuit when steam pressure reaches a set limit below the safety valve setting.
- Try lever test
- Manual lifting of a safety valve lever to verify the valve opens freely and reseats; done with boiler pressure at least 75 percent of set pressure.
- Deaerator
- Feedwater heater that removes dissolved oxygen and carbon dioxide by heating water and venting the released gases.
- Conductivity blowdown
- Surface blowdown controlled by boiler water conductivity or TDS to limit dissolved solids and prevent carryover.
- Scale
- Hard mineral deposit on boiler heating surfaces that reduces heat transfer and can overheat tubes and shell.
- Steam trap
- Automatic valve that discharges condensate and noncondensable gases from steam lines while preventing steam loss.
- Water hammer
- Pressure shock caused by rapid condensation or slug of condensate moving in a steam pipe; prevented by draining and slow valve operation.
- Expansion tank
- Hot water system component that absorbs the volume increase as water is heated and maintains system pressure.
- Boiler log
- Record of operating readings, blowdowns, water tests, and abnormal conditions kept for inspection and trend analysis.
- Hydrostatic test
- Pressure test using water, usually at 1.5 times design pressure, to verify strength and tightness of boiler components.
- Ultrasonic thickness test
- Non-destructive inspection that measures remaining metal thickness to detect corrosion or erosion in boiler parts.
- Low-water emergency
- If gauge glass shows no water, shut off fuel and do not add water until the boiler has cooled and been inspected.
- Tube rupture
- A boiler tube failure releases steam or water into the furnace; shut down, isolate fuel, and protect personnel from steam.
- Carryover
- Boiler water droplets or foam carried into steam lines, causing water hammer, erratic level, and contaminated steam.