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Central Boiler Plants III 30 HSW LU Hours


Quiz Questions

1.The primary purpose of a central Boiler plant is to:
Economically produce energy for distribution.
Process a wastewater plant
Operate a chemical manufacturing facility
2. The energy produced by a Central Boiler Plant can be in the form of
Steam
Hot water
Compressed air
Electric power
All of the above
3.A distribution system is necessary to carry this energy to buildings, hospitals, kitchens and laundries where it is used for heating, cooling process, sterilization and production of hot water.
True
False
4.A central Boiler plant is comprised of the following 10 major categories: Heat absorbing equipment, fuel handling equipment, combustion equipment, air handling equipment, controls and instrumentation, pollution control equipment, water treatment systems, water supply equipment, distribution systems, miscellaneous.
True
False
5.Which one of the following a boiler design must meet?
Operational safety
Generation of clean steam or hot water at the desired rate, pressureand temperature.
Economy of operation and maintenance.
Conformance to applicable codes.
All of the above.
6.All boilers, superheaters, economizers, and other pressure parts must be built using materials and construction methods specified by the applicable code sections. Repairs to boilers must also be made in accordance with code requirements. Equipment built and inspected in accordance with the code must have an ASME stamp. An “S” in a cloverleaf is stamped on power boiler and an “H” in a cloverleaf is stamped on heating boilers.
True
False
7.Drums, shells, headers are used :
To collect steam or hot water generated in the boiler and distribute it as necessary in within the boiler tubes.
To strengthen the boiler.
To cool the boiler temperature.
8.Many of the first steam boilers produced were designed with the products combustion passing inside the tubes
True
False
9.Water tube boilers were developed for a variety of reasons, including the need for higher pressures, higher capacities, superheated steam, faster responses to load changes, and increased safety due to the reduced water volume.
True
False
10.Economizers are used to recover heat from the boiler flue gases and thereby increase boiler efficiency. The heat absorbed by the economizer is transferred to the boiler feed water flowing through the inside of the economizer tubes.
True
False
11.To ensure safe operation, the ASME Boiler and Pressure Vessel Code requires that boiler be equipped with a water gage glass and gag cocks, water column, pressure gage, and safety valves.
True
False
12.Gage Cocks are used to check the accuracy of the boiler water level as indicated by the gage glass.
True
False
13.Safety valves are installed to prevent excessive pressure buildup in the boiler, superheater, or economizer. Safety valves are designed to quickly pop to the full open position when the steam pressure rises to the set point and to quickly close when the pressure drops a preset amount ( blow down or blow back).
True
False
14.Each steam discharge outlet from a boiler, except the safety valve and superheater connections, must have a stop valve.
True
False
15.Each boiler must have at least one blowoff connection installed at the lowest water space available to allow removal of sludge.
True
False
16.Soot, fine ash, and cinders can collect on boiler tubes and cause a substantial decrease in the heat transfer rate.
True
False
17.Natural gas is not an easy and clean fuel to burn and requires more equipment and maintenance than coal or oil systems.
True
False
18.Boilers are not equipped with safety devices to minimize the risk of low water and explosion related damage.
True
False
19.Boiler plant emission regulations are issued by federal, statw, and local environmental agencies, with the most stringent regulation usually being imposed. Two general types of regulations exist: point source regulations and ambient air quality standards.
True
False
20.Point source regulations place limits upon quantity of a pollutant which may be emitted from any stack, regardless of a pollutant which may be emitted from any stack, regardless of its relationship to local air quality.
True
False
21.Ambient air quality standards may be applicable to any size boiler. These standards require that the emissions from the unit be considered, as they affect the air quality of the surrounding area.
True
False
22.The standard operating procedure (SOP) must be posted in the boiler room. The SOP should clearly indicate the sequence of actions to be performed for each unusual condition, which could create a hazard or operational interruption.
True
False
23.Examples of such unusual conditions include: flame failure, loss of water, tube failure, sudden loss of load, steam line failure, loss of electric power or control malfunction.
True
False
24.Boiler efficiency accounts for the energy loss included in combustion efficiency plus the energy losses associated with heat radiated from the boiler casing, heat removed with blow down, and heat lost due to incomplete combustion. Boiler efficiency is affected by the stability of the combustion controls. Boiler efficiency is always less than combustion efficiency.
True
False
25.In Chapter 4; boiler water requires treatment to protect both the boiler and the distribution system.
True
False
26.Corrosion of the steam distribution system is the result of carbon dioxide and oxygen released from the boiler water. The carbon dioxide condenses to form carbonic acid which combines with oxygen to attack the distribution system piping.
True
False
27.Scale or sludge may be formed from either dissolved or suspended solids. Figure 4-2 shows a pipe failure caused by scale
True
False
28.Boilers are classifieds as follows:

Low temperature water LTW (up to 250° F. less than 160 psi)
Medium Temperature Water MTW (up to 251° F. to 350°F)
High Temperature Water HTW (up to 351° F. to 450° F)
Low Pressure Steam LPS (up to 15 psig)
High Pressure Steam HPS (above 15 psig)

True
False
29.The daily inspection of the boiler includes the following:

Water level.
Steam pressure or water temperature stability.
Flue gas temperature at two loads, compared to clean boiler temperature.
Flue gas oxygen or carbon dioxide levels at two loads, compared with baseline data.
Water or steam leaks.
Air leak in casing, ducts, or setting.
Take water sample and perform necessary tests per chapter 4. Adjust internal treatment and continuous blow down.
Blow down steam boilers through the bottom blow down connection to remove sludge.
Clean boiler exterior.

True
False
30.The successful operation and maintenance of a boiler is greatly dependent on the operation and maintenance of its auxiliaries. Boiler operation and boiler preventive maintenance both involve the inspection of the boiler operating conditions.
True
False