Glossary Terms Book 3

Question 1

Uninhibited chemical chain reaction

Answer 1

A chemical reaction that produces more molecular energy than that needed for the reaction to occur. The molecular energy will result in the reaction becoming continuous.

Question 2

Lanyard

Answer 2

A flexible line or strap attached to a worker’s harness at one end and to a lifeline or a fixed anchor point at the other end. The lanyard must comply with the CSA Standard Z259 requirements.

Question 3

Lifeline

Answer 3

Is a vertical line attached to to a fixed anchor point to which a worker can attach their lanyard. This arrangement allows the worker more freedom of movement. The lifeline must comply with the CSA Standard Z259 requirements.

Question 4

Lockbox

Answer 4

A designated box easily identifiable as a lockable box used in a group lockout.

Question 5

Personal lock

Answer 5

A specific type of lock used by personnel - operators, contractors, engineers - that is uniquely identified as a personal lock

Question 6

PPE

Answer 6

Personal protective equipment, such as goggles or steel toes

Question 7

Turnarounds

Answer 7

Are planned and scheduled events for different types of energy plants to perform maintenance, repairs, inspections, and testing on equipment. Often the entire process is shut down, with all hazardous materials and energy removed to allow workers to work safely.

Question 8

UEL

Answer 8

Upper explosion limit for gas concentrations in air

Question 9

LEL

Answer 9

Lower explosion limit for gas concentrations in air

Question 10

Anions

Answer 10

These are the negative ions. Therefore Na is a cation and Cl is an anion. As they say, “opposites attract”

Question 11

Cations

Answer 11

These are the positive ions of a chemical mixture

Question 12

CBD or Continuous Blowdown

Answer 12

This is normally found on high pressure boilers to control the total dissolved solids content of the boiler water.

Question 13

Deaerator

Answer 13

Used mainly in large high pressure plants. The feedwater is pumped to this unit and mixed with steam to release any dissolved oxygen, which is then vented to the atmosphere

Question 14

Effluent

Answer 14

This is the term used to describe the water or fluid that is discharged from a unit after treatment. Example would be water leaving a sodium zeolite softener

Question 15

Feedwater

Answer 15

This is the water that is added to a boiler to replace the water that has been turned into steam or lost as part of operation

Question 16

Grooving

Answer 16

The term given to carbon dioxide corrosion in condensate return lines when it is absorbed into the condensate forming an acidic solution

Question 17

Ion Exchange

Answer 17

Ion exchange is the process of passing the feedwater through a material that contains a less harmful ion (such as sodium) so that the material exchanges the less harmful ion for a scale forming ion (such as calcium) in the water

Question 18

Pitting

Answer 18

The term given to oxygen corrosion in a boiler or vessel

Question 19

TDS or Totally Dissolved Solids

Answer 19

This is the total of all the dissolved solids contained in the water of a steam boiler. It includes any chemicals that may have been added for internal water treatment. Boiler manufacturers will provide a recommended level of TDS, which is controlled by adjusting the CBD. It can also be controlled by intermittent blowdown if a CBD is not installed.