Page 20 - CITS - Welder - Trade Theory

WELDER - CITS

xix Never try to repair regulators.
xx Soapy water should be used for detecting leaks.

Safety during cutting gas welding and cutting
i Sparks from cutting and gouging can travel a considerable distance. Hence Such work should be carried out
in a safe place away from all risk of Causing fire.
ii Fire Extinguishers and Sand should be readily available.

iii When cutting inside boilers or others confined places, gas cylinders should always be placed outside.
iv Cutting should never be done on concrete floor because a portion of concrete may get cracked. Asbestos
mates or steel sheets should be used to protect the floor cutting.

Fire and fire fighting equipments

Objectives: At the end of this lesson you shall be able to
• state the types of fire
• describe the fire fighting equipments
• describe the list of general fire equipments.

Introduction
Fire fighting equipment is a range of tools and appliances that are designed to extinguish fires.
When used correctly, this equipment will protect the operator from harm.

Class A Fires: “Ordinary” Fires
Class A fires are the most common of the 5 different classes of fires. They occur when common combustible
materials like wood, paper, fabric, trash, and light plastics catch fire. These accidental fires are ubiquitous across
a variety of industries, so it’s recommended to have adequate protection against “ordinary” fires in addition to
other condition-specific fires.

Despite being “ordinary”, don’t rule this class of fire as low-risk. If there’s an abundance of fuel present, these fires
can intensify quickly. It’s best to put out a Class A fire quickly before it spreads using water or monoammonium
phosphate.

Class B Fires: Liquids & Gases
Class B fires involve flammable liquids and gases, especially fuels like petroleum or petroleum-based products
such as gasoline, paint, and kerosene. Other gases that are highly flammable are propane and butane, which are
common causes of Class B fires. The best way to deal with these types of fires is by smothering them or removing
oxygen using foam or CO2 fire suppression equipment.
Be aware that Class B fires do not include grease fires or cooking fires, which belong to their own class.

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CITS : C G & M - Welder - Lesson 1-3 CITS : C G & M - Welder - Lesson 1-3