Boilers

Question 1

What does a siphon do?

Answer 1

Protects gauges from the heat of the steam

Question 2

What can cause a boiler to explode?

Answer 2

Adding water to a hot dry boiler

Question 3

What’re the benefits of water treatment?

Answer 3

Prevents scale build up, corrosion, and pitting

Question 4

What causes corrosion?

Answer 4

Oxygen

Question 5

How often do you test a safety valve?

Answer 5

Monthly

Question 6

What is the remedy for a cold hydronic coil?

Answer 6

Bleed the air from the cool

Question 7

What is the purpose of the tri cocks?

Answer 7

Show you the water level

Question 8

How often should a hot water boiler open inspection happen?

Answer 8

Every 5 year

Question 9

What’re two options for zone control in hydronic system?

Answer 9

Zone valves and circulators

Question 10

What valve do you find on makeup water?

Answer 10

Globe valve and Ball valve

Question 11

11

Question 12

How do you check for a water log diaphram expansion tank?

Answer 12

Tap for hallowness

Question 13

What device uses operating control and high limit?

Answer 13

Aquastat

Question 14

How many exhanges of air?

Answer 14

4 during the pre-purge

Question 15

What is the purpose of the surface blowdown?

Answer 15

Reduce tension and remove purity

Question 16

What is it called when water droplets strike the steam?

Answer 16

Water Hammer

Question 17

What type of valves used for main steam stop?

Answer 17

Gate valve

Question 18

What do you do with a leaking relief valve?

Answer 18

Replace it

Question 19

What is the purpose of the water column?

Answer 19

Reduces the fluctuation in the water

Question 20

What can cause incomplete combustion?

Answer 20

Insuficiant Air

Question 21

What is the purpose of the expansion tank?

Answer 21

Allow water to expand and contract in the system

Question 22

What causes priming or carryover?

Answer 22

High water level, high surface tenison

Question 23

Which type of boiler wont be used for high pressure?

Answer 23

Cast Iron

Question 24

At what tempature does thermal shock return?

Answer 24

50 F tempature between supply and return

Question 25

What is the effect a undersized circulator on a hydronic system?

Answer 25

Poor heat delivery

Question 26

What is MAWP

Answer 26

Maximum Allowable Working Pressure

Question 27

Hydronic circulator sized is based on what?

Answer 27

Flow requirement, GPM, head pressure, psig

Question 28

What factor can effect boiler efficiency?

Answer 28

Scale build up and heat exhanger

Question 29

What is the effect of an oversized circulator on a hudronic system?

Answer 29

Decrease in efficiency because burning cycles more frequently

Question 30

Acceptable PH for boilers?

Answer 30

Steams boilers: 10.5

Hot water: 8.5

Question 31

Gauge glass is full, what does it mean?

Answer 31

Top valve plugged or valved off, just full

Question 32

What can cause the relief valve to open on a hot water boiler?

Answer 32

Water logged expansion tank

Question 33

Low pressure boilers?

Answer 33

15 paig or less steam boilers

Liquid not over 150 psig or temp 250 F

Question 34

Common setting for low pressure relief valve?

Answer 34

30 psig

Question 35

Capacity of a safety rating?

Answer 35

Rated in pounds of steam per hour

Question 36

Capacity of a safety relief valve in a hydronic system?

Answer 36

Rated in BTU’s relief per hour

Question 37

What two devices monitor system pressure in a hydronic system?

Answer 37

Circulator and expansion tank

Question 38

Which boiler has the fire outside the tube?

Answer 38

Water tube

Question 39

What functions does the awuastat relay control?

Answer 39

High limit, circulator, burners circuit, pressure switch

Question 40

What is a common oxygen scavenger use?

Answer 40

Sodium sulfite