MD Boiler Operator flashcards
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31 cards. Read the term and the definition here. The deck at the top of this page is optional.
- Fire-tube boiler
- A boiler in which hot combustion gases pass through tubes surrounded by water; it has a large water volume, slower steam response, and is common in low-pressure heating service.
- Water-tube boiler
- A boiler in which water circulates inside tubes heated by combustion gases; it has smaller water volume, faster response, and is suited to high pressure and large capacity.
- ASME Section I
- The ASME Boiler and Pressure Vessel Code section for power boilers generating steam above 15 psig or hot water above 160 psig and 250°F.
- ASME Section IV
- The ASME Boiler and Pressure Vessel Code section for heating boilers operating at or below 15 psig steam or 160 psig and 250°F hot water.
- Boiler horsepower
- A heat output equivalent to 33,475 Btu per hour, approximately 34.5 pounds of steam per hour evaporated at 212°F from and at 212°F.
- Waterwall tubes
- Furnace wall tubes that absorb radiant heat, protect refractory from high temperature, and increase steam generation in a water-tube boiler.
- Try cock
- A manual valve used to sample water level at a fixed elevation; it gives an independent check but does not replace the gauge glass.
- Low-water cutoff
- A safety control that interrupts burner fuel when boiler water falls below a safe level; it must be tested and maintained in service.
- Gauge glass
- A direct water-level indicator connected to the boiler steam and water spaces; blowdown valves allow cleaning and verification of its connections.
- Steam safety valve
- An automatic spring-loaded pop-type pressure relief device set at or below MAWP; no shutoff valve may be installed between it and the boiler.
- Feedwater check valve
- A one-direction valve that allows feedwater into the boiler while preventing backflow from the boiler into the feedwater line or deaerator.
- Stoichiometric air
- The theoretical amount of air required for complete combustion of a fuel; practical firing supplies excess air beyond this amount.
- Three T's
- Time, temperature, and turbulence; together with adequate oxygen, these conditions are needed for complete combustion in a boiler furnace.
- High carbon monoxide
- A flue-gas reading indicating incomplete combustion, often from insufficient air, poor fuel-air mixing, cold furnace conditions, or flame impingement.
- Draft
- The pressure difference that moves air into the furnace and combustion gases toward the stack; it may be natural, forced, induced, or balanced.
- Flame scanner
- A device that detects ultraviolet or infrared flame; it proves flame before fuel admission and trips fuel on loss of flame.
- Deaerator
- Equipment that removes dissolved oxygen and carbon dioxide by heating feedwater near saturation and venting the released gases.
- Feedwater pH
- For carbon steel boiler systems, an alkaline range often around 8.5 to 10.5 is maintained to reduce corrosion; the treatment program sets the exact target.
- Total dissolved solids
- Dissolved mineral content in boiler water; it is controlled by blowdown to prevent foaming, carryover, and deposits in steam lines.
- Water softener
- An ion-exchange unit that replaces calcium and magnesium with sodium; it reduces hardness scale but does not remove dissolved solids or oxygen.
- Bottom blowdown
- A procedure that removes sludge and sediment from the lowest water spaces; it is done with the boiler under pressure using short, controlled valve openings.
- Warm-up rate
- The controlled speed at which a cold boiler is heated; slow, uniform warming limits thermal stress and uneven expansion of boiler parts.
- Lockout tagout
- An energy-isolation procedure that locks out sources before maintenance, verifies zero energy, and prevents accidental startup or release of stored energy.
- Confined space entry
- Entry into a boiler interior or similar space requires a permit, atmospheric testing, ventilation, an attendant, and a rescue plan.
- Water hammer
- A pressure surge caused by steam contacting cold water or by trapped condensate; lines are drained and warmed slowly before steam admission.
- Hydrostatic test
- A strength and leak test in which the boiler is filled with water and pressurized; the safety valve is isolated and test pressure follows the applicable code.
- MAWP
- Maximum allowable working pressure; the highest pressure at which the boiler may operate, and the limit for safety-valve settings and operating controls.
- Jurisdictional inspection
- An inspection by the state or local authority having jurisdiction at required intervals; a current certificate to operate is issued when requirements are met.
- NBIC
- The National Board Inspection Code, which covers in-service inspection, repairs, and alterations of boilers and pressure vessels with documentation requirements.
- Maryland boiler law
- Maryland statutes and regulations govern boiler licensing, inspection, and operation; the authority having jurisdiction enforces current thresholds, fees, and license classes.
- Operator license class
- A Maryland stationary engineer or boiler operator credential level based on boiler type, pressure, and capacity, with experience and examination requirements.