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104 Cards in this Set
- Front
- Back
What is the disadvantage or limitation of a fire tube boiler? |
As pressure and temperature are increased, the thickness of the shell will also increase
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A water tube boiler is considered to be a boiler that has?
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Two drums and tube system used for direct heat transfer
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Steam generating units used in a power generation primarily produce?
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Superheated steam
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A miniature boiler is built/ manufactured in accordance with?
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ASME Section 1
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A direst fired boiler with a maximum steam pressure of 207kpa (30psig) is constructed in accordance with?
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ASME Section 1
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A heating boiler is built in accordance with?
ASME section 4 |
ASME section 4
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The feed water distributor pipe is installed in the boiler?
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steam drum
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Internal separators will produce
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Dry saturated steam
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what device will a power generation steam plant use between the high pressure and lower pressure turbines?
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Reheaters
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What is the primary function of an internal separator?
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To separate wet saturated steam into dry superheated steam.
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the two types of superheaters are?
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convection and radiant
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The feed water distribution pipe is located in the?
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Lower space of the steam drum
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Retractable soot blowers are used for cleaning?
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radiant super heaters (stuff inside the furnace)
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The piping system from the steam generator to the turbine would be built in accordance to?
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ASME B31.1 Power piping
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When rating a steel high pressure boiler the agency that would do this service is
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SBI( Steel boiler institute)
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Boilers built to ASME section 1 scope are
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Gross rated
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A process/heating boiler is rated at 1660000Btu. What is the EDR rating (steam)?
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6916
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A steam boiler rated for 60psig will produce 750BHP how many pounds of steam per hour is the boiler capable of producing?
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25875 ( 750 x 970)
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A high pressure boiler producing 12493lb/hr of steam would have a gross rating of
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12121.8MBH
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What principle is not normally used for rating high pressure boilers
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Ft2 of heating surface
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The Valve that acts as a safety first valve to prevent a backflow of steam is a
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Stop and check valve
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On a water tube boiler the feed water line is installed in the steam drum at
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A level slightly below the normal operating water line
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The water level in the boiler is controlled by a
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Continuity probe
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The max size of the blow off line is
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2.5 inches
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The min size for water column connections from the boiler is
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1 inch
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The item or trim that does not require a pressure gauge is the
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Gauge glass
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Safety valves shall be located on the
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Reheaters
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Instrumentation, controls and interlocks are found in
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ASME Section 6
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On a fire tube boiler the burner section is located in the
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Furnace
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A retractable soot blower on a water tube boiler is found in
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The furnace area
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Troubleshooting fuel controls and valves would best be handled by a
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Gasfitter
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Troubleshooting large moving equipment such as fans and ball mills would best be handled by a
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Millwright
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Blow off piping on a HP Boiler is covered under ASME code
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Section 1
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The Max size of blow off piping is
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2.5inchs
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The code that allows to discharge 75 c ( 170 f) of effluent into a drain is
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The national plumbing code of Canada
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A boiler feed water pump must be capable of delivering water pressure 3% greater than
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A relief valve
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A LP steam pump and receiver generates a max 138kpa (20psig) as per
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Section 4
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A pressure powered pump uses this energy force for power
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Steam
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The type of heat that a desuperheater controls is
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Sensible heat
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The type of force required on a venturie to move the boiler feed water is a
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Vacuum
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The bypass valve on a water makeup solenoid valve is normally a
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Plug globe valve
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If the economizer has a control valve incorporated upstream of the device
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it must have a SRV
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If the wrong valves are installed in the wrong locations on a blow off assembly you would most likely encounter this type of major damage to the valve/ valves
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Wire drawing
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On blow off vessel rendered 100% safe to work on what item must be checked before removing the hand hole/man way
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Pressure gauge
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The device required downstream of a turbine to produce clean dry steam is the
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Oil separator
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During shutdowns and scheduled maintenance this item must be inspected and verified to be reliable on the economizers
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SRV
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The desuperheater will have a buildup of material internally if you have poor quality
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Demineralized water
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Where does flash steam get heat from
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HP condensate
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What ASME section covers pressure vessels greater than 42.5 liters (1.5cu ft)?
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VIII
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A pressure relief valve is designed to relieve vapour?
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False
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Vessels serving as a cushion tank with a capacity of 454 liters (120 US gal) or less are not covered by ASME section I
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True
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What is a pressure relief device designed to do?
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Reclose after opening
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What is a rupture disc activated by?
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Inlet static pressure
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All pressure vessels within the scope of ASME Section VIII shall be protected with over pressure protection?
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True
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Where should a safety pop valve be located?
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In the vapour space of the pressure vessel
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What must the minimum inlet size be when two or more pressure reliefing devices are placed on one outlet of the pressure vessel?
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Combined area of the inlets of the relief devices
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Where there is a double seated valve gives the best service.
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Constant demand
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What type of valve is a pressure reducing valve?
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Automatic valve
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What is the recommended turn down ratio from the high pressure side to the low pressure side of a pressure reducing valve?
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10 to 1
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When PRV’s are piped in series what should the spacing between the valves be?
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10ft
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Sustained flows 5% below Cause valve seats to?
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erode.
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What is the condition in a pressure reducing valve where the valve disc is throttling close to its seat and does not know whether to open or close?
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Hunting
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The simplest of the pressure reducing valves is the ?
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Single seated valve
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What is the recommended change in pipe sizes before or after a pressure reducing valve?
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1 or 2 pipe sizes
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What will turning the set screw or the hand wheel clockwise on a single seated PRV change?
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Increase down stream pressure
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What is to be provided when the downstream equipment is designed for a pressure lower than the supply pressure entering a pressure reducing valve?
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A safety or pressure relief valve
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When steam is the primary heat source how should a strainer be installed in the piping to the pressure reducing valve?
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On its side
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1The Cv factor is determined experimentally and gives the GPM of water that a valve will pass with what pressure drop?
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1.0 psi
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Excessive velocity through a pressure reducing valve will result in
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Noise
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Condensate from the steam entering the pressure reducing valve should be removed by a?
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Separator
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What are two gases used to pressurize a HTHW system?
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Steam and Nitrogen
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What type pf vent is used on a HTHW system?
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Manual
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How does the HTHW boiler differ from a HP steam boiler?
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Boiler Nozzle
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System pressure is maintained above saturation temperature so HTHW will flash?
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False
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How does LP steam created in a HTHW system
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Immersion generator
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Why is the systempressure maintained above saturation temperature of water?
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So HTHW will not flash to steam
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Why can smaller diameter lines be used for HTHW systems?
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HTHW has a higher thermal capacity
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Why is the expansion drum elevated when using a steam pad for pressurization?
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To prevent a cavitation of the pumps
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All boilers for HTHW systems are designed in accordance with ASME Section I
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True
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Which Alberta authority has the power to enforce the ASME regulations?
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ABSA
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What registered CRN is given for New Brunswick?
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7 (2 for Alberta) {refer to chart on pg 16 of HTHW plants 305c}
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What is the most common heat exchanger found in industrial applications?
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Shell and Tube type
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Do not clean out exchangers with (BLANK( when operating fluids are of a flammable or hazardous nature.
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Air
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A slight sludge or scale coating on the tubes greatly (BLANK) the heat transfer efficiency
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Decreases
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The medium that supplies the heat to the heat exchangers is specified when?
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First
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Tube to tube heat exchangers may be the best choice for (BLANK) situations because the single tube passage creates higher velocities.
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Low flow
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What is the suggested max distance for bands on a 13mm (1/2”) tracer line
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450mm (18”)
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How much of the plant steam is consumed by process tracing lines?
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small amounts
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In general he percent of steam locations in a hydrocarbon processing plant are?
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70%
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Which type of glycol has the best heat transfer capabilities?
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Ethylene
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Excess steam is vented to atmosphere on a flash steam system by?
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A backpressure valve
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When steam is exhausted to the atmosphere by a turbine it is considered to be a Condensing Plant
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False
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When hot condensate re-evaporate it is referred to as?
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Flash Steam
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What velocity does ASHREA recommend for proper separation of flash steam in a flash vessel?
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10 ft/ sec
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Which ASME code is referenced when a flash vessel 6 inches in diameter is used?
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B31.1
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What is a series flash steam recovery steam system called?
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A Cascade system
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What type of pressure does a backpressure valve control?
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Upstream pressure
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What is the most important dimension on a flash tank?
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Diameter
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When 2000 lb/hr of condensate from a source at 100 psig is flashed to 10 psig what is the weight of the LP steam available?
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212
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In general which piece of equipment produces usable exhaust steam ?
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Turbine
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What type of force is used to remove moisture from vapour in an exhaust head?
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Centrifugal
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What is another term used when referring to a backpressure valve?
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Surplussing valve
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Why is the size of the flash vessel important?
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It prevents carryover
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In a flash steam system water logging of equipment is caused when?
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Steam space pressure is less than flash vessel pressure
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