Low Pressure Steam Boiler Piping And Trim Flashcards Preview

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Flashcards in Low Pressure Steam Boiler Piping And Trim Deck (14)
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0

What is the minimum size of boiler feed line for a boiler having less than a 100 sq ft of heating surface?

1/2"

1

What is the name of the piping configuration designed to prevent complete drainage of the boiler in case of a broken wet return line

The Hartford Loop

2

What is the piece of pipe between the return header and blow-off valve called?

The blow-off line

3

What type of valve would be used on a low pressure steam boiler for draining?

Globe Valve

4

What would be the steam header size for a low pressure steam boiler with four 2" steam nozzles?

4"

5

What is the required grade for steam main piping?

1" per 20 ft

6

What is the required grade for the steam header piping?

2% or 1/4" per ft

7

How should the minimum capacity rating of a safety valve to be installed on a boiler compare to the data provided on the boiler rating plate?

Equal to or greater than the maximum heat output rating

8

What is the function of the operating pressure control?

To turn on or shut off the fuel at the pressures required for use in the system

9

Where would a compound gauge be used instead of a pressure gauge

On a system that may operate at pressures less than standard atmospheric

10

Where is the lowest visible portion of the water gauge glass on a LP steam boiler to be set during installation ?

At least 1" above the lowest safe water line

11

If a controller with a subtractive differential scale is set with a differential pressure of 1 psi on a system to be operated at a minimum of 1psi, what is the setting for the pressure on the main scale?

2psi

12

What will happen if a combination LWCO/water feeder control cannot keep up with a drop in the boiler water line

The LWCO switch will open and shut off the fuel supply to the boiler

13

What can happen if the cold water impinges on a directly heated surface within a boiler

Cracking of the boiler metal due to thermal shock