Chapter 2- Steam Boiler Fittings

Question 1

What is Safety Valve?

Answer 1

An automatic, full opening, pop action valve that is opened by overpressure in a boiler and used to relieve the overpressure before damage occurs

Question 2

Is safety valve the most important valve on a boiler?

Answer 2

Yes

Question 3

What is Chattering?

Answer 3

Is the rapid opening and closing of the safety valve

Question 4

What is the Safety Valve capacity?

Answer 4

Is the amount of steam, in pounds per hour (lb/hr)

Question 5

What is total force?

Answer 5

Is the total amount of five in pounds acting against the safety valve disc

TF= P x A

Tf is total force

P is pressure

A is Area

Question 6

What is Blowback?

Answer 6

The drop in pressure in the boiler that occurs after the safety valve has opened

Question 7

What is the code for Boiler and Pressure Vessel?

Answer 7

All low pressure steam boilers with more that 500 sq ft of heating surface and a steam generating capacity that exceeds 4000 lb/hr shall have two or more safety valves

Question 8

What is a safety relief valve?

Answer 8

Is a specially designed automatic valve that can be used as a safety valve or as a relief valve

Question 9

What is a try level test and how many times should it be preformed?

Answer 9

Is a safety valve test performed by lifting the safety valve try lever and it should be preformed every 30 days

Question 10

What is a pop test and how many times should it be tested?

Answer 10

A safety valve test performed to determine if a safety valve opens at the proper pressure within allowable tolerances and it should be tested annually

Question 11

What is a steam pressure gauge?

Answer 11

A boiler fitting that displays the amount of pressure in pounds per square inch (psi) inside the boiler

Question 12

What is Hydrostatic Pressure and the formula?

Answer 12

The weight of water (0.433 psi per vertical foot)

H=V x 0.433

H= hydrostatic pressure (in psi)

V= vertical distance (in ft)

0.433= psi per vertical ft

Question 13

What is a bourdon tube?

Answer 13

Is an oval tube shaped like a question mark that has a tendency to straighten when pressurized

Question 14

What is a siphon?

Answer 14

A bent tube installed between the boiler and a boiler fitting that provides a water seal to prevent contact with steam

Question 15

What is a vacuum?

Answer 15

Pressure below atmospheric pressure

Question 16

What is a transducer?

Answer 16

A device that receives a signal representing a variable, such as temperature, pressure, or flow, and converts that signal into an electrical or digital signal that is compatible with a digital control system

Question 17

What is a transmitter?

Answer 17

A device that sends a signal to a controller, such as a programmable logic controller or other digital controller

Question 18

What is a water column?

Answer 18

A boiler fitting that reduces the turbulence of boiler water to provide an accurate water level in the gauge glass

Question 19

What is a blowdown?

Answer 19

The process of evacuating (discharging) water and undesirable accumulated materials

Both water column and gauge glass should be blown down each shift

Question 20

What is a bottom blowdown valves?

Answer 20

They are valves located on the blowdown line used to release water from the bottom of the boiler

Question 21

What is Carryover?

Answer 21

A condition that occurs when small particles of boiler water are carried into the steam lines

Question 22

What is priming?

Answer 22

A condition where large slugs of boiler water are carried into steam lines

Question 23

What is water hammer?

Answer 23

A condition where a hammering or banging sound is created in steam lines when water is carried along in steam lines and hits elbows, valves , or other obstructions

Question 24

What is a blowdown tank?

Answer 24

A vessel that prevents damage to the sewer system from steam and hot water by holding blowdown water until it is cool enough for safe discharge

Question 25

What is flash steam?

Answer 25

Is steam formed as high temperature water evaporates when there is a drop in pressure

Question 26

What is dumping?

Answer 26

Process of draining all the water from the boiler

Question 27

What is a boiler vent?

Answer 27

A boiler fitting used to vent air from inside of the boiler

Question 28

What is cutting a boiler in on line?

Answer 28

The opening of the main steam stop valve to the main steam header to allow to flow to its point of use

Question 29

What is a pressure control?

Answer 29

A switch that starts the burner, controls the firing rate, or shuts down the burner based on steam pressure

Question 30

What is a modulating control?

Answer 30

A pressure control that works with the operating control to vary the burner firing rate

Question 31

What is high fire?

Answer 31

Is the burner firing rate when the maximum amount of fuel is burned in the furnace

Question 32

What is heat exchanger?

Answer 32

An auxiliary device commonly used with boiler to transfer heat from a hotter fluid to a cooler fluid