Low Pressure Boiler

Front 1

primary air

Back 1

control of combustion rate which determines the amount of fuel burned

Front 2

scale is formed on heating services at approximately what temperature

Back 2

150 degrees

Front 3

blow downs should be done for how long

Back 3

5 to 10 seconds.

Front 4

a continuous blowdown is what?

Back 4

discharges water at a controlled rate to insure proper chemical concentration in the boiler water

Front 5

pop test

Back 5

determines if the safety valve opens at the proper pressure

Front 6

blow back

Back 6

a drop in pressure after the safety valve has been released

Front 7

M.A.T.T

Back 7

m-mixture of air and fuel a- atomization of fuel t-temperature t- time to complete combustion

Front 8

siphon

Back 8

a bent tube between the boiler and boiler fitting to prevent contact with steam

Front 9

boiler horsepower

Back 9

evaporation into steam at 34.5 lbs with a water temp at 212 degrees F

Front 10

one boiler horsepower is equivalent to what

Back 10

33,472 btu/hr

Front 11

where must the water column be located

Back 11

lowest visible part of the gauge glass 2-3 inches above the highest heating surface located at the NOWL

Front 12

safety valve should be trylever tested how often

Back 12

every 30 days

Front 13

perfect combustion

Back 13

fuel is burned using only the theoretical amount of air

Front 14

secondary air

Back 14

controls combustion efficiency and how completely fuel is burned

Front 15

hydrostatic air

Back 15

weight of water per vertical foot

Front 16

what is purging

Back 16

the process of using air to discharge residual fuel oil in the boiler nozzle

Front 17

atmospheric pressure

Back 17

14.7 PSI

Front 18

total force

Back 18

the total amount of force acting against the safety valve disc

Front 19

low pressure boiler limist

Back 19

steam boilers not to exceed 15psi and hot water boilers not to exceed 160psi and 250 degrees near the boiler outlet

Front 20

safety valve capacity

Back 20

the amount of steam per hour that the safety valve is capable of venting

Front 21

latent heat

Back 21

identified by a change in state but no change in temperature

Front 22

the area on a safety valve that increases surface area and total force applied

Back 22

huddling chamber

Front 23

bottom blowdown line is what

Back 23

piping located at the lowest point of the water side of a boiler

Front 24

bottom blowdown valve is located where

Back 24

on the blowdown line

Front 25

compression tank

Back 25

absorbs water pressure in the hot water boiler system

Front 26

firebox boiler

Back 26

firetube boiler that has a roundtop and flat sides

Front 27

first law of thermodynamics

Back 27

energy cannot be created or destroyed but can be changed from one form to another

Front 28

second law of thermodynamics

Back 28

heat always flows from a material with a high temperature to a material with a low temperature

Front 29

float thermostatic steam trap is what

Back 29

it has a ball float that opens and closes a discharge valve depending on amount of condensate in the chamber

Front 30

forced draft

Back 30

mechanical draft from air PUSHED through the boiler with fans located in the front of the furnace

Front 31

high limit control

Back 31

a pressure control that senses steam pressure and automatically shuts down the burner if the operating limit control fails

Front 32

induced draft

Back 32

a mechanical draft from air PULLED through the boiler furnace with fans located in the breeching

Front 33

outside stem and yoke valve (OS and Y valve)

Back 33

a gate valve that indicates if its open depending on the position of the stem

Front 34

pressure control

Back 34

a switch that starts the burner, controls the firing rate or shuts down the burner based on steam pressure

Front 35

priming

Back 35

large slugs of water are carried into the steam line

Front 36

radiation

Back 36

heat transfer that occurs as radiant energy with out a material carrier

Front 37

return steam trap

Back 37

removes condensate from steam lines and heating units and discharges it directly into the boiler

Front 38

surface blowdown valve is what/where

Back 38

on the surface blowdown line and is used to release water and surface impurities from the boiler

Front 39

thermodynamic steam trap is what

Back 39

a single movable disc that raises to allow the discharge of air and cool condensate

Front 40

try cocks

Back 40

is a valve located on the water column used to determine the boiler water if the gauge glass is broken

Front 41

all steam boilers operate using what systems

Back 41

feed water, fuel, draft, and steam system

Front 42

a vacuum gauge is what

Back 42

indicates the amount of vacuum (pressure below atmospheric pressure) in the boiler

Front 43

quick opening valve

Back 43

is a lever-operated valve that functions as a sealing valve and is always opened first and closed last

Front 44

a slow-opening valve

Back 44

is used as the blowing valve and takes all the wear during blowdowns

Front 45

can a safety valve be used to vent a boiler?

Back 45

NEVER

Front 46

how often should a fusible plug be replaced?

Back 46

annually

Front 47

the ASME code only requires fusible plugs on what kind of boiler?

Back 47

coal burning boilers. But they can still be used on gas/oil boilers

Front 48

what is a fusible plug?

Back 48

a warning devise used to indicate extreme over heating.

Front 49

what is an operating control?

Back 49

It initiates the burner start up sequence and shut down sequence.

Front 50

what is a high limit control?

Back 50

it senses steam pressure and automatically shuts down the burner if the operating limit control fails.

Front 51

what is the function on a modulating control?

Back 51

Controls the firing rate of the burner.

Front 52

check valve

Back 52

allows water to flow in one direction.

Front 53

what is the function of a condensate return tank?

Back 53

it is a boiler accessory that collects condensate returned from the boiler.

Front 54

how often should a automatic makeup water feeder be blown down?

Back 54

at least once a week

Front 55

what is a strainer?

Back 55

it protects the automatic makeup water feeder from scale or lime deposits from city water

Front 56

how many low water fuel cutoffs must there be?

Back 56

at least one

Front 57

a thermostatic steam trap is what?

Back 57

a steam trap that has a bellows filled with fluid that boils at steam temperature

Front 58

float thermostatic steam trap

Back 58

a ball float that opens and closes a discharge valve depending on the amount of condensate in the chamber.

Front 59

inverted bucket steam trap

Back 59

steam enters the bottom and flows into an inverted bucket.

Front 60

thermodynamic steam trap

Back 60

a single movable disc that raises to allow the discharge of air and cool condensate

Front 61

natural gas

Back 61

colourless and odorless fossil fuel that consist primarily of methane, small amounts of ethylene and other gases

Front 62

combustion controls what

Back 62

fuel supply, air supply, air to fuel ratio, and removal of gases of combustion

Front 63

an on/off control system controls what?

Back 63

the amount of steam produced by starting and stopping the burner.

Front 64

an on/off control system is commonly used on what?

Back 64

small package boilers and where the steam load allows the burner to start and stop as required

Front 65

a flame safeguard monitors what

Back 65

burner start-up sequence and the main flame and controls the firing rate during normal operation

Front 66

a flame safeguard programmer sequences burner function for what

Back 66

pre-purge, ignition trials, run period, and post-purge

Front 67

a draft system is what

Back 67

a boiler system that regulates the flow of air to and from the burner

Front 68

what is the cause of foaming

Back 68

formation of steam bubbles trapped below a film on the boiler water surface

Front 69

boiler water pH must be between what

Back 69

7 and 10

Front 70

surge tank

Back 70

collects condensate before sending it to the deaerator

Front 71

bypass feeder

Back 71

introduces feedwater treatment chemicals into a boiler at a predetermined and controlled rate

Front 72

what is the FIRST thing that should be checked when entering a boiler room

Back 72

check the boiler water level

Front 73

when blowing down a gauge glass what should happen

Back 73

water should enter the gauge glass quickly indicating that the lines are free of sludge, sediment, or scale build up

Front 74

what is the function of try cocks on a water column?

Back 74

second method to check water level.

Front 75

what is the purpose of a feedwater pump?

Back 75

boiler accessory to pump feed water to the boiler

Front 76

how does a pressure control function to control the burner?

Back 76

a switch that shuts ON/OFF the burner based on steam pressure.

Front 77

what is the purpose of a safety valve?

Back 77

prevent the boiler from going over the MAWP( maximum allowable working pressure)

Front 78

how often should a safety valve be tested?

Back 78

every 30 days

Front 79

what is a low water fuel cutoff on a boiler

Back 79

shuts off the boiler if it is low on water

Front 80

what are two reasons for a bottom blowdown?

Back 80

1. remove sludge and 2. chemical concentration control

Front 81

how does a safety valve operate to prevent the boiler from exceeding its MAWP

Back 81

opens until enough steam is released and there is a drop in pressure

Front 82

how often should a low water fuel cutoff be tested?

Back 82

Daily

Front 83

what is an aquastat

Back 83

a fitting that senses water temp in the boiler by starting and stopping the burner

Front 84

what is a compression tank

Back 84

it absorbs water pressure

Front 85

high and low fire of the burner is controlled by what

Back 85

aquastat

Front 86

a fan located between the breeching and stack is what

Back 86

induced draft fan

Front 87

a main steam stop valve would most likely be a

Back 87

os and y gate valve

Front 88

complete combustion is what

Back 88

burning all the fuel with the theoretical amount of air

Front 89

oxygen in the boiler causes what

Back 89

pitting

Front 90

foaming of boiler water from floating foreign matter causes an increase in what?

Back 90

surface tension

Front 91

a water column must be located where

Back 91

at the normal operating water level

Front 92

a feed whater pump can become steambound from what

Back 92

feedwater temp too hot

Front 93

the boiler vent is opened when

Back 93

warming the boiler and draining the boiler

Front 94

the number of blowdowns required is determined by what

Back 94

feedwater analysis

Front 95

annunciator

Back 95

an audible electronic alarm that alerts the boiler operator of a condition that needs immediate attention

Front 96

back flow preventer

Back 96

a boiler accessory that prevents the flow of boiler water back to the city water

Front 97

boiler cross tee

Back 97

a pope fitting with removable plugs that allow for cleaning inspection of piping

Front 98

breeching

Back 98

a duct used for the transport of gases of combustion from the boiler to the stack

Front 99

carryover

Back 99

a condition that occurs when small particles of boiler water are carried into the steam lines

Front 100

compound gauge

Back 100

a pressure gauge that indicates vacuum in inches of mercury or pressure in PSI on the same gauge

Front 101

conduction

Back 101

heat transfer that occurs when molecules in a material are heated and the heat is passed from molecule to molecule through the material

Front 102

convection

Back 102

heat transfer that occurs when currents between warm and cool regions of a fluid

Front 103

makeup water

Back 103

water added to the boiler to replace lost water from steam leaks, blowdown, and/or other losses in the system

Front 104

package boiler

Back 104

a boiler that is preassembled at the factory

Front 105

steam pressure gauge

Back 105

a boiler fitting that displays the amount of pressure in PSI inside the boiler

Front 106

surge tank

Back 106

a water treatment accessory that is used to collect condensate before sending it to the deaerator