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Block 2 > Hydronic Heating Boilers > Flashcards

Hydronic Heating Boilers Flashcards

1
Q

What is the maximum temperature for a low temperature hot water boiler?

A

120 c
250 f

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2
Q

What is the maximum pressure for a low temperature hot water boiler?

A

1100 kPa or 160 psig

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3
Q

How are low temperature hot water boilers rated?

A

BTUH or EDR

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4
Q

Are low temperature hot water boilers net or gross rated?

A

Net

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5
Q

What section of the ASME do low temperature boilers comply with?

A

4

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6
Q

What is the lower temperature that high temperature hot water boilers may exceede?

A

120 c
250 f

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7
Q

What is the upper pressure limit for a heigh temperature hot water boiler?

A

There is none

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8
Q

How are high temperature hot water boilers rated?

A

MBH or BHP

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9
Q

Are high temperature hot water boilers net or gross rated?

A

Gross

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10
Q

With what section of the ASME must heigh temperature hot water boilers comply?

A

1

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11
Q

In what 3 ways are boilers rated?

A

Input
Gross output
Net rating

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12
Q

How many BTU’s dose it take to raise one pound of water one degree Fahrenheit?

A

1

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13
Q

One Boiler Horse Power (BHP) will evaporate how many pounds of water per hour?

A

34.5

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14
Q

What dose input represent in a boiler consumption?

A

Amount of heat in the fuel burned by the burner.

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15
Q

Name 4 types of boilers.

A

Fire tube
Water tube
Cast iron sectional
Condensing

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16
Q

In a fire tube boiler what surrounds the tubes?

A

Water.

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17
Q

In a water tube boiler what is in the tubes?

A

Water.

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18
Q

Cast iron is an excellent material for the construction of sectional boilers. Why?

A

Natural corrosion resistance provides them a long life span with minimal maintenance.

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19
Q

Do cast iron sectionals hold more or less fluid than their copper and steel counterparts?

A

Much more volume of fluid.

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20
Q

What are the 2 categories of cast iron sectional boilers?

A

Vertical

Horizontal

21
Q

What are horizontal cast iron sectional boilers also called?

A

Pancake boiler

22
Q

In a condensing boiler what is the heat exchanger made from?

A

Stainless steel

23
Q

Condensing boilers operate with a high or low temperature return?

A

Low

24
Q

Both water and fire tube boilers use steel heat exchangers.

True or False?

A

True

25
Q

Water tube boilers use only copper tube heat exchangers.

True or False?

A

True

26
Q

Name 2 high mass boilers.

A

Fire tube

Cast iron sectional

27
Q

Name 2 low mass boilers

A

Water tube

Condensing

28
Q

Which type of boiler uses tie rods and push nipples for assembly?

A

Cast iron sectional

29
Q

What is the major disadvantage of a high mass boiler?

A

Slow recovery

Potential for explosion

30
Q

What is the first process before installation of a boiler?

A

Inspect unit for damage

31
Q

What 2 types of air supply must be supplied for proper installation?

A

Combustion and ventilation

32
Q

Which section of the ASME contains rules for care and operation of heating boilers?

A

6

33
Q

Why could be the result of low fluid pressure in a boiler?

A

Lead to no fluid and boiler not firing

34
Q

If you find fluid leaking past the pressure relief valve what is the first thing to check?

A

Pressure in boiler

35
Q

What should be checked on the combustion air inlet?

A

Free from obstruction and dirt.

36
Q

What is the BTU value of an EDR?

A

Steam 240 btu/h
Hot water 150 btu/h

37
Q

What problem will occur in a conventional boiler if the flue gases are cooled to their dew point?

A

Draft hood spillage or damage caused by corrosive condensate.

38
Q

Which is classified as a high mass boiler?

Copper tube
Steel water tube
Copper tube for domestic water supply
Cast iron sectional

A

Cast iron sectional

39
Q

What code covers the fabrication, installation, and inspection of boilers?

A

ASME code

40
Q

What does ASME stand for?

A

American Society of Mechanical Engineers

41
Q

Which of these boilers can be used to directly heat domestic water?

Cast iron sectional
Steel fire tube
Cast iron condensing
Copper water tube

A

Copper water tube

42
Q

How would you classify a fire tube boiler?

A

High Mass

43
Q

What can cause coil damage in a low mass boiler?

A

Low or no flow through the heat exchanger.

44
Q

What material is commonly used to construct sectional boilers?

A

Cast iron

45
Q

What is the purpose of the safety relief valve?

A

To protect the boiler system from excess pressure.

46
Q

When installing a boiler where would you find the clearance to combustibles?

A

Appliance rating plate.

47
Q

When providing a maintenance check you find a low mass boiler with excessive noise and popping sounds. What could this indicate?

A

Low flow condition.

48
Q

When checking the combustion air and venting system of a high efficient boiler, you notice the termination is covered in ice. What should be done?

A

Remove the ice and snow and any debris .

49
Q

Incomplete combustion will cause a carbon build up on the fins of the exchanger. Who should be consulted?

A

Gasfitter

Block 2 (33 decks)

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