chapter 2. boiler systems

Question 1

what are the 4 boiler systems

Answer 1

feedwater system
fuel system
draft system
steam system

Question 2

what does the feedwater system supplies

Answer 2

suitable water to the boiler at the temper-ature and pressure needed to sustain the steaming cycle

Question 3

what does the fuel system supplies

Answer 3

fuel in the proper condition for the combustion process.

Question 4

what does the draft system provides

Answer 4

provides air for combustion and discharges the gases of combustion into the atmosphere.

Question 5

what does the steam system does

Answer 5

controls and directs the steam to the point where its energy is used for process operations, heating, or the generation of electricity.

Question 6

Steam is

Answer 6

vapor that forms when water is heated to its boiling point

Question 7

If the pressure controls fail, what is the last resort to control pressure in the boiler

Answer 7

the safety valve

Question 8

what kind of steam contains more heat energy superheated steam or saturated steam

Answer 8

Superheated steam

Question 9

when a steam header is used

Answer 9

when multiple boilers are in battery

Question 10

Any time there is a reduction in steam pressure through a pressure-reducing station, there must be a ___to protect the devices designed to operate at the reduced pressure.

Answer 10

safety valve

Question 11

Feedwater is

Answer 11

water supplied to a boiler.

Question 12

_____protect boilers by preheating the feedwater to remove most dissolved gases.

Answer 12

Deaerators

Question 13

Water weighs approximately

Answer 13

8.3 lb/gal

Question 14

where deaerator tank is located

Answer 14

above the feedwater pumps

Question 15

Each feedwater pump has its own _____to prevent hot water from the boiler from backing up if the check valve located close to the boiler fails.

Answer 15

check valve

Question 16

what valve is closest to the boiler in the feedwater line

Answer 16

the stop valve

Question 17

in the feedwater line why the stop valve is closest to the boiler

Answer 17

so that the check valve can be repaired without draining the boiler

Question 18

A fuel system is

Answer 18

a boiler system that provides fuel for combustion to produce the heat needed to evaporate water into steam

Question 19

Natural gas leaks must be located by

Answer 19

qualified in plant personnel or a gas company representative.

Question 20

what is vaporstat

Answer 20

is a safety switch between the manual reset

valve and zero gas governor

Question 21

In a low-pressure gas system, the rate of combustion is controlled by

Answer 21

the amount of air supplied to the venturi.

Question 22

A typical high-pressure gas system is sized at about

____btu/hr to _____ Btu/hr

Answer 22

2,000,000 Btu/hr to 84,000,000 Btu/hr

Question 23

what does the gas-pressure regulator does

Answer 23

controls the gas pressure supplied to the burner