Low Pressure Steam Boilers 2nd Yr Flashcards Preview

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Flashcards in Low Pressure Steam Boilers 2nd Yr Deck (23)
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A boiler rated for hot water service at 120 psig (827kpa) and 240*F (116*C) maximum would be constructed under the rules of which code?

ASME section IV

1

Which firetube boiler is built with a firebox that is not completely surrounded by water?

Firebox boiler

2

Which boiler consist of an arrangement of drums and headers interconnected by tubes?

Watertube

3

How many fans are used to control the draft through a balanced draft boiler ?

2: one on the inlet and one on the outlet

4

Which boiler would be classified as a firebox boiler

HRT

5

What is the minimum clearance required in front of a access panel on a gas-fired boiler?

24" regardless of whether it is insulated or not

6

What does the installer have to do with the boiler and piping system before turning them over to the owner?

Inspect and test for leak tight service

7

What is the cause of the most common problems encountered after start-up of steam boilers and systems?

Improper cleaning and flushing

8

What is likely to occur if there is a heavy concentration of dissolved or suspended particles in the boiler water?

The water may foam and could cause foaming

9

What should be done if the water in the sight glass is not clear after cleaning and flushing?

Repeat the cleaning procedure

10

What should be done with the results of all pertinent test results during the test , start and balance phases of a system start-up?

Record the results and have the results verified

11

Where is the appliance's gross rating ?

Boiler nozzle outlet

12

Where is the appliances's net rating taken

Heat emissions units

13

What does the term pass in the boiler mean ?

The number of times the products of the combustion travel the length of the boiler

14

What is the main advantage of steam over hydronic systems?

Speed of transmission

15

What is the usual maximum circulating speed of water for a low temperature hot water heating system?

4ft/sec

16

What does load tracking refer to when discussing boilers

That ability of a boiler to respond to changes in steam or hot water demand

17

Which boiler has the ability to respond to sudden demands for large volumes of steam for a short period of time ?

Firetube

18

Which boiler has the ability to handle wide variations in load over a long period of time ?

Watertube

19

Why is clean condensate considered to be ideal for feeding back into boiler ?

Condensate is essentially distilled water so it contains no dissolved solids n

20

How often should a pop test be done on a safety valve house on an Lo steam heating boiler?

Annually

21

What is the suggested method of determining whether water is flowing through a water feeder valve?

Listen with stethoscope

22

What is the most probable cause of the water level in a gauge glass fluctuating rapidly ,?

Foaming or priming inside the boiler