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79 Cards in this Set
- Front
- Back
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Where would a PRV sense its pressure to operate properly? |
10 Pipe Diameters Downstream
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What is the recommended pressure turndown ratio for the first PRV when installed in series? |
10:1 |
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Which type of valve is used to maintain constant pressure downstream of the turbine? |
Backpressure / Surplussing Valve |
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When installing a PRV what is the recommended pipe size change before or after the PRV(s)? |
1 or 2 |
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Over sizing in a pressure reducing valve may cause what condition to occur? |
Hunting |
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What valve is the simplest of the pressure reducing valves, used for on/off service? |
Single-Seated |
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What change will occur if the set screw or hand wheel is turned clockwise on a single-seated PRV? |
Increase downstream pressure |
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When installing pressure reducing valves in series, what is the recommended spacing? |
10 feet |
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A backpressure valve is known by what other name? |
Surplussing Valve |
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What is the ASME code that covers flash tanks? |
Section VIII (8) |
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What is produced when hot condensate re-evaporates? |
Flash Steam |
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What would a flash steam recovery system be called if more than one flash tank is used in series? |
Cascading |
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What is the principle that a steam ejector works on? |
Venturi |
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What section of the ASME code refers to HP power boilers? |
Section 1 |
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What is the superheater designed to do to saturated steam? |
Add sensible heat |
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What causes moisture to separate from the vapor in an exhaust head? |
Centrifugal Force |
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The minimum inlet size when combining 2 or more pressure relieving devices must be? |
Combined area of the inlets of the relief devices |
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Rupture discs are activated by? |
Inlet static pressure |
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What is another name for a heat exchange? |
Calorifier |
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What must be located in vapor space of a pressure vessel? |
Safety valve |
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What is a safety relief valve designed to do? |
Reclose after operation |
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What is the energy source for flash steam? |
HP condensate |
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What ASME code section covers unfired pressure vessels greater than 4.2 liters (1.5 cubic feet)? |
VIII (8) |
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How can HP steam be used for LP heating application? |
Decrease the pressure |
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Steam traps classified as these 3 terms... |
Mechanical, Thermostatic, and Thermodynamic |
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What type of trap is used when space is minimal? |
Disc |
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What is the general rule of thumb for safety factor when sizing a trap? |
2X |
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What is the proper size of a drip leg for a 300mm (12") steam main? |
150mm (6") |
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What are 2 advantages of HTHW systems over steam? |
Less water treatment is required Less internal corrosion because Less water make-up is required |
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The 2 gases are used to pressurize a HTHW system are? |
Steam & Nitrogen |
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HTHW system use this piece of equipment to generate LP steam? |
Immersion generator |
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What is done in a HTHW system to prevent the water from flashing? |
System pressure is maintained above saturation temperature |
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How does the HTHW boiler differ from a HP steam boiler? |
Boiler nozzle |
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After circulating through the system, were is the wwater returne in a HTHW system? |
It is returned to the expansion drum |
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What type of vent is used on a HTHW system? |
Manual |
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What CRN # designates registration in Alberta? |
2 |
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What temperature is HTHW usually limited to? |
232 celcius / 450 farenhieght |
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What is one similarity in steam boiler design used for HTHW installation that is shared with other types of high pressure steam boilers? |
They are usually of welded construction |
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Do not use _______ to clean exchangers when operating fluids are of a flammable / hazardous nature? |
Air |
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The medium that recieves the heat in the heat exchanger is specified when? |
Second |
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Why do extend surface heat exchangers have fin or corrugations on the tubes? |
Increase heat transfer |
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What important safety device is needed on a heat exchanger when steam is supplied to the shell through an automatic control valve? |
Vacuum breaker |
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What is one advantage a plate heat exchanger has over a shell & tube HEX? |
Takes up less floor space |
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Where is the fan located on an induced draft cooling tower? |
Top |
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What type of backflow device is needed for a cooling tower with a submerged inlet? |
RP |
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What would be one advantage of a venturi cooling tower? |
No electrical connections |
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What is the most effective way to cool down water in a cooling tower? |
Evaporative |
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What happens to the water when it is pumped through the spray nozzles of a cooling tower? |
Atomized |
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Diffrence between LTHW & HTHW is the _____ in which they operate. |
Temperature |
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LTHW operate below ________ can't create steam at a pressure greater than 15psig. |
121 celcius 250 farenhieght |
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HTHW systems operate above _______ and maintained at a pressure higher than their saturation pressure _______ to remain stable and not flash. |
1100 kPa 160 psi |
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HTHW is governed under ______ of ASME. |
Section 1 |
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The diffrence between HTHW & LTHW is in the ____. |
Boiler Trim |
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______ boiler is common as HTHW service. |
Water Tube |
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In the steam boiler HTHW system, the lower temperature water returned from the system is directed to the ________. |
Expansion drum |
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The water for the feed pump(s) is taken from a ________ , water level is automatically maintained by a ______ valve. |
Hot well or Reciever float valve |
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HTHW generator is similar to the water tube boiler except there's no ____. |
Steam Drum |
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The expansion drum in HTHW boilers is usually a _______ tank to reduce interaction between the gas & water from the system. |
Vertical |
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On HTHW systems pipe can not be connected with _____. |
Threads |
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Reverse return is 1st served and ____ returned. |
Last |
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Reverse return is 1st served and ___ returned. |
1st |
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What does the "PP" indicate in PP-11-FM-72-P. |
Pressure Plan |
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Calorifiers are also known as... |
Heat Exchangers |
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Heat Exchangers transfer heat from one fluid to another without _____ the fluids. |
Mixing |
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Main purpose of a _______ is to add heat to the process. |
Heat exchanger |
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______ heat changes a liquid to a vapor. |
Latent |
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Cooling towers are used to _____ cooling water. |
Recycle |
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Venturi tower is either ____ or _____ and has no fan of its own. |
Forced Induced |
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Induced draft cooling tower has a fan(s) located at the ___ of the tower. |
Top |
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______ draft towers use the fan to push the air through the tower. |
Induced |
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Low pressure boiler is upto _____psi/____kPa. |
15psi 103kPa |
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LP boilers can be ______ or _____ boiler. depending on the boiler _____ & allowance for steam space in the boiler. |
Steam Hot Water Trim |
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ASME section #___ defines HTHW boiler systems as one using water temperature above ____c / _____f and pressures over ___kPa / _____psi. |
1 121 250 1100 160 |
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HTHW system operate between 177c - 232c / 350f - 450f & not for _____c /____f normally. |
260c 500f |
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What section of ASME is the Fired pressure vessel? |
1 |
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HTHW boiler = ______ control & pressure ______ valve. |
Temperature Relief |
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List the 3 non-reclosing Pressure Relief valves. |
Rupture Disc Break Pin Spring loaded non-reclosing press. relief devices |
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No ______ valves between the vessel & it's protective devices or between the protective devices & the point of ______. |
Stop Discharge |
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Cascading system is a ____ system only it needs to be repeating. |
Flash Steam |
