BOILER TEST

A low pressure steam boiler has a maximum allowable working pressure (MAWP) of up to \___.

15 psi

In a firetube boiler, the heat and gases of combustion pass \___.

through the tubes

A firetube boiler may be used \___.

in high or low pressure plants

Because of the large volume of water, the boiler most likely to cause a boiler explosion is \___.

a firetube boiler

A horizontal return tubular (HRT) boiler is a \___ boiler.

a firetube

A sudden drop in boiler steam pressure without a corresponding drop in boiler water temperature could result in \___.

a boiler explosion

The part of a boiler that has the heat and gases of combustion on one side and water on the other side is known as the \___.

heating surface

the comparison, or ratio, of heat supplied in fuel to heat absorbed by water is defined as \_____ efficiency

thermal

The steam and water drum of watertube boilers is dished (concave) to eliminate the need for \___.

stays

vertical firetube boilers require

high ceilings, less floor space, the use of staybolts, (all of the above)

In a watertube boiler, the heat and gases of combustion pass \___.

around the tubes

The \___ boiler has a large volume of water in relation to horsepower size.

firetube

The mud drum is the lowest part of the water side of a(n) \___ boiler.

watertube

Boiler plates and staybolts are subjected to \___ stress.

tensile

Safety valve connections must be approved by the \___.

American Society of Mechanical Engineers (ASME)

The most important fitting on a boiler is the \___.

safety valve

to prevent failure from pressure over the MAWP, all steam boilers must be equipped with at least one \____

safety valve

A safety valve will \___.

prevent the boiler from exceeding its MAWP

Safety valves are designed to \___.

pop open

superheater safety valves are set to open

before the main safety valves are opened

When testing a safety valve by hand, there must be \___.

at least 75% of the popping pressure

any repairs to a safety valve should be done by the \___

safety valve manufacturer or manufacturer's authorized representative

the setting or adjusting of a safety valve should only be done by the

qualified person who is familiar with the construction and operation of a safety valve

If it is necessary to test the relieving capacity of a safety valve, \___.

an accumulation test is put on the boiler

the relieving capacity of a safety valve is measured in

pounds of steam per hour capable of discharging under a given pressure

try cocks

Secondary way of determining the water level

The water column and gauge glass should usually be blown down \___.

once a shift

A steam pressure gauge is calibrated in \___.

pounds per square inch

A siphon protects the steam pressure gauge from

high temperature of steam

the pressure at the base of a vertical foot of water is \____ psi

0.433

the boiler vent is located

at the highest part of the steam side of the boiler

the boiler vent is open when warming up a boiler until

there is a 10 to 15 psi of steam pressure on the boiler

saturated steam is steam at

its corresponding temperature and pressure

when steam is superheated the

temperature increases with no increase in pressure

soot should be

removed from boiler tubes for better heat transfer

Boilers in battery equipped with manhole openings must have \___ according to the ASME code.

two main stem stop valves

Main boiler stop valves must be \___ valves.

os&y gate

The AMSE code will allow an automatic nonreturn valve to be used as a main steam stop valve. If one is used it must be \____

installed as close to the shell of the boiler as practical on the main steam line

The main steam stop valves should be gate valves because they

offer no restriction to the flow of steam

When the boiler is equipped with hand-operated, main steam stop valves, to cut the boiler in on the line, the steam pressure on the incoming boiler should be \___.

slightly lower than line pressure

when a boiler is being inspected, two main steam shop valves are

closed, locked, and tagged

During a boiler warm up, to remove any condensate trapped between the two boiler stop valves the \____.

free-blowing drain should be open

According to the ASME code, boilers operating at 100 psi or over must have

two bottom blowdown valves

When blowing down a boiler equipped with a quick-opening valve and a screw-type valve, the quick-opening valve is

opened first and closed last

If a quick-opening valve is used as a bottom blowdown valve, it must be located

between the boiler and the slow-opening (screw-type) valve

The maximum size of the bottom blowdown line and the surface blowdown line is \___

2.5

Bottom blowdown lines on a watertube boiler are located on the \___.

mud drum

the most accurate means of deciding the frequency of blowdown of boiler is determined by a

boiler water analysis

Oxygen and other noncondensable gases are separated from the feedwater

in the open deaerator feedwater heater

The four systems required to operate a steam boiler are \___.

steam, feedwater, fuel, and draft

In order to produce one pound of steam, it is necessary to evaporate \___.

1 lb of water

Steam that has lost its heat and has turned back into water is \___.

condensate

A safe and efficient boiler plant should include \_______________ pump(s)

one steam and one electric feedwater

on a boiler burning low pressure gas, the volume (amount) of gas burned is controlled by the

volume of air passing through the venturi tube

On the fuel oil system, the purpose of the duplex strainers on the suction line between the tank and fuel oil pump is to \___.

allow one strainer to be cleaned without securing the boiler

A draft fan located between the boiler and chimney is used in \_____ draft system

induced

the open feedwater heater is located

above the feedwater pump

No. \___ fuel oil must be heated in order to be pumped

6

pulverized coal has the consistency of talcum powder so that it

can come in closer contact with the oxygen for complete combustion

Draft is defined as a difference in pressure that causes \___.

air or gases to flow

Air is mixed inside of the burner register in a \____ gas system

high pressure

natural draft is produced by a

difference in temperature of a column of gas inside the chimney from a column of air outside the chimney

Pulverized coal is burned in \___ in the furnace.

suspension

Gas leaks should be located and repaired by a \___.

gas company representative

The automatic city water makeup valve found on an open feedwater heater is used to \___.

maintain a water level in the feedwater heater if there are insufficient condensate returns

the purpose of a feedwater regulator is to

maintain a consistent water level in the boiler

the sequence of three numbers found on the data plate attached to a reciprocating feedwater pump indicates the \______

diameter of steam piston, diameter of water piston, and length of pump stroke

A reciprocating feedwater pump must have a safety relief valve located between the \___.

pump and the discharge valve

An economizer is used in large boiler plants to heat \___.

feedwater using gases of combustion

Centrifugal feedwater pumps can be started with their discharge valves \___.

open or closed

water temperature that is too high in the open feedwater heater could cause

the feedwater pump to become steambound

water temperature that is too low in the open feedwater heater could cause

oxygen pitting in the boiler

in a low pressure gas burner, a \____ shuts off the gas supply if a low water condition exists

manual reset valve

An indication of a dirty fuel oil strainer would be \___ across the strainer

a large pressure drop

Duplex strainers are found on \___ of the fuel oil pump

both the suction and discharge sides

Fuel oil heaters must be used when burning no. \___________________ fuel oil

6

A gas pressure regulator is used to control

Desired pressure at the burner

a solenoid valve is a direct-acting valve in the gas system and is used \_____

as an automatic gas shutoff valve

Blowers are used in a high-pressure gas system to\___

supply air for combustion

The air to gas ratio is maintained by a \________

modulating motor and linkage, air damper, butterfly valve (all of the above)

the gas pressure reducing valve in the low pressure gas system reduces the gas pressure to \____ psi

0

Boilers are equipped with a combination gas/fuel oil burner for \___

more flexible operation

pulverized coal burns

in suspension

The volume of gas to the burner in a high pressure gas system is controlled by a \_____________ valve

butterfly

in order to burn 1 lb of fuel, approximately \____ lb of air are needed

15

draft is measured in

inches or tenths of an inch of a vertical water column

To reduce the heat loss of flue gases going to the chimney, boilers are equipped with

economizers and air heaters

the amount of draft available in a natural draft system is dependent on the

height of the chimney

the gases of combustion leaving a boiler that has natural draft are controlled by

outlet dampers

Rank refers to the \___ of a coal

degree of hardness

bituminous coal has a high \___content

carbon

\______________________ coal is the type of coal most likely to have problems with spontaneous combustion when being stockpiled

bituminous

Air that controls the combustion efficiency is \____ air.

secondary

Air supplied to the burner that is more than the theoretical amount needed to burn a fuel is \___ air

excess

Air needed for the combustion of fuel is made up of approximately \_____________% oxygen & \___________________% nitrogen

21; 79

No. \_______________ fuel oil must be heated to reach the required temperature for combustion

6

high numbered fuel oils produce \____ lower numbered fuel oils

more Btu per gallon than

the heating value of a fuel is expressed in

British Thermal Units

The ON/OFF pressure control must be connected to the \______

highest part of the steam side of the boiler

A steam siphon ensures that \___ does not enter the boiler pressure control

steam