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1. UT Basic/ Advanced > UTB10 Steam Distribution Systems > Flashcards

UTB10 Steam Distribution Systems Flashcards

1
Q

In a two-pipe vapor system with a return trap, the bottom of the trap should be how many inches above the boiler waterline?

A

18”

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2
Q

The exterior distribution system is divided into what two systems?

A

Underground and aboveground

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3
Q

The utilidor type of steam distribution system is part of what distribution system?

A

Underground

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4
Q

(True or False) The frost line is the lowest depth that the ground freezes during the coldest part of winter.

A

True

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5
Q

Insulation associated with the conduit type of steam distribution CANNOT be installed in which manner
A. Directly to the pipe
B. Attached to the inner surface of the conduit
C. Packed between the pipe and conduit
D. Directly to the conduit

A

D. Directly to the conduit

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6
Q

Why is the bottom of the trench filled with broken rock when dealing with the conduit type distribution system?

A

Adequate water drainage

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7
Q

What material is used to construct the utilidor type distribution system?

A

Brick or concrete

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8
Q

What is the main drawback of an overhead distribution system?

A

High cost of maintenance

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9
Q 
Which of the following is NOT a classification factor when considering an interior steam distribution system?
A. Pipe arrangement
B. Accessories used
C. Air expulsion method
D. Pipe size
A

D. Pipe size

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10
Q

In a gravity, one-pipe, air-vent system, the return of condensate depends on what factor?

A

Hydrostatic head

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11
Q

The necessary internal drainage in a gravity, one-pipe, and air-vent system can be obtained by sloping the piping in what manner?

A

1/4 of an inch for every 10 feet of pipe

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12
Q

What interferes with the proper drainage of water from a radiator that is part of a gravity, one-pipe, and air-vent system?

A

Partial opening of main steam stop valve

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13
Q

Incorrectly pitched mains located in gravity, one-pipe, and air-vent systems cause what condition?

A

Uneven heat distribution

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14
Q

What trap permits the flow of condensate and air from the radiator installed in a two-pipe vapor system with a return trap?

A

Thermostatic

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15
Q

Which valves shut and open when the return trap float starts to rise?

A

Air vent shuts and steam valve opens.

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16
Q

What type of pump is used in the two-pipe vapor system with a condensate pump?

A

Centrifugal

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17
Q

At what section of a condensate pump does the return main terminate in a two- pipe vapor system?

A

Receiver end

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18
Q

Which system is the most practical and trouble-free?

A

Two-pipe vapor system with condensate pump

19
Q 
Which is NOT a possible cause of an entire distribution system’s failure to heat in a two-pipe vapor system with a condensate pump?
A. Flooded return line
B. Open receiver vents
C. Lack of pump capacity
D. Air binding the system
A

B. Open receiver vents

closed receiver vents cause an entire system to fail.

20
Q

How many inches of water must be maintained in the vacuum pump in a two-pipe vapor system with a vacuum pump and condensate return line?

A

3-10”

21
Q

Steam radiators are classified into how many categories?

A

2
fin-tube radiator
cast-iron radiator

22
Q

(True or False) Cast iron radiators are similar to those used in hot-water heating systems.

A

True

23
Q

Where is the manual vent installed on a cast iron radiator?

A

Same spot as an automatic vent

24
Q

How many steam traps are associated with steam distribution systems utilized by the Seabees?

A

7

(1) float
(2) bucket thermostatic
(3) float thermostatic
(4) impulse
(5) thermodynamic
(6) throttling
(7) bimetallic element

25
Q

When using a ball-float trap, where is the condensate returned to?

A

Feedwater system

26
Q

Which indication identifies a bucket trap leaking steam?

A

Excessively hot condensate return line

27
Q

What is another term used for the thermostatic trap?

A

Radiator trap

28
Q

The pressure on the discharge side of the impulse trap should not be over what percentage of the inlet pressure of the trap?

A

25%

29
Q

Thermodynamic traps are constructed out of what material?

A

Stainless steel

30
Q

How is the rate of flow of the condensate adjusted when using a throttling trap device?

A

Raising or lowering needle valve.

31
Q

What happens when the bimetallic strip in the bimetallic-element trap is heated?

A

Bends

32
Q

How are dirt and sediment removed from traps?

A

Blowdown of traps is conducted

33
Q

Which condition indicates a defective valve operation?

A

Continuous steam blow

34
Q

What can be installed to compensate for differences between the demand and supply of water?

A

One or more water tanks

35
Q

What type of trap is usually installed inside a water tank to allow condensate to drain into the return line?

A

Float thermostatic

36
Q

What two types of steam-operated water heaters are utilized?

A

Storage and instantaneous

37
Q

According to safety regulations, the hot water in steam heaters will not exceed how many degrees?

A

180°F

38
Q

What temperature-regulating element controls the temperature in steam water heaters?

A

Valve

39
Q

What is the bulb and copper tube assembly called in a temperature- regulating device?

A

Capsule and capillary tube

40
Q

What is the temperature range on a gauge installed on a hot-water tank?

A

40°F to 210°F

41
Q

At what pressure is the relief valve set at on a hot-water heater?

A

10 pounds higher than operating pressure

42
Q

How many expansion joints are associated with steam distribution systems?

A

5

(1) slip joint
(2) bellows joint
(3) swing joint
(4) expansion loop
(5) ball joint

43
Q

Ball joint expansion type joint allows for how many degrees of flexibility?

A

30° to 40°

44
Q

(True or False) Expansion loops require little maintenance except inspection for alignments and leaks.

A

True

1. UT Basic/ Advanced (25 decks)

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