Lesson Notes By Weeks and Term v4 - SHS 2
HEALTH AND SAFETY IN ENGINEERING PRACTICE
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HEALTH AND SAFETY IN ENGINEERING PRACTICE
Download the Lessonotes Mobile Ghana app for faster lesson access on Android and iPhone.
Subject: Engineering
Class: SHS 2
Term: 1st Term
Week: 11
Grade code: 2.1.2.LI.5
Strand code: 1
Sub-strand code: 2
Content standard code: 2.1.2.CS.1
Indicator code: 2.1.2.LI.5
Theme: ENGINEERING PRACTICE
Subtheme: HEALTH AND SAFETY IN ENGINEERING PRACTICE
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In Ghana, we see engineering in action every day – from the local mechanic ("fitter") repairing a tro-tro, to welders creating beautiful gates, to large-scale construction projects in our cities. While this work builds our nation, it can also be very dangerous. A simple mistake can lead to serious injury or even death. Professionals don't just guess about safety; they use tools to understand and manage dangers systematically. One of the most powerful tools for this is the Risk Assessment Matrix. This lesson will teach you how to use this professional tool to identify, analyse, and control risks, making any engineering workplace safer for everyone.
This topic revolves around understanding and quantifying danger. Let's break down the key ideas. A. Hazard vs. Risk These two words are often used interchangeably in everyday language, but in engineering, they have very specific meanings. Hazard: A hazard is anything that has the potential to cause harm. It is the source of the danger. Example 1: A puddle of engine oil on the floor of a mechanic's workshop. Example 2: An exposed, live electrical wire. Example 3: A very sharp blade on a cutting machine. Think of it as: The *thing* that can hurt you. Risk: Risk is the chance or probability that a person will be harmed by the hazard, combined with how severe the harm could be. Example 1: The risk is that a person might slip on the oil, fall, and break a bone. Example 2: The risk is that someone might touch the live wire and get a severe electric shock. Example 3: The risk is that an operator might cut their hand on the sharp blade. Think of it as: The *likelihood and consequence* of the hazard actually causing harm. B. What is a Risk Assessment? Risk assessment is the formal process of: Identifying hazards. (What can cause harm?) Analysing the risks associated with those hazards. (How likely is it to cause harm, and how bad would it be?) Evaluating the risk. (Is the risk acceptable, or do we need to do something about it?) Implementing control measures to eliminate or reduce the risk.
The Risk Assessment Matrix is the primary tool we use for Step 2 and 3. C. The Risk Assessment Matrix A risk assessment matrix is a simple visual tool that helps us to determine the level of a risk by considering its two key components: Likelihood and Severity. Likelihood (or Probability): This asks, "How likely is it that the harm will actually happen?" We can rate this on a scale, for example, from 1 to 5.
| Rating | Level | Description | | :--- | :--- | :--- | | 5 | Almost Certain | Is expected to occur in most circumstances. Happens frequently. | | 4 | Likely | Will probably occur in most circumstances. Happens often. | | 3 | Possible | Might occur at some time. Happens occasionally. | | 2 | Unlikely | Could occur at some time, but not expected. Happens rarely. | | 1 | Rare | May occur only in exceptional circumstances. Has almost never happened. | Severity (or Consequence/Impact): This asks, "If the harm does happen, how bad will it be?" We can also rate this on a scale from 1 to 5.
| Rating | Level | Description | | :--- | :--- | :--- | | 5 | Catastrophic | Death or permanent disability to one or more people. | | 4 | Major | Serious, life-altering injury requiring hospitalisation (e.g., amputation, severe burn). | | 3 | Moderate | Injury requiring medical attention (e.g., deep cut needing stitches, broken bone). | | 2 | Minor | First-aid injury (e.g., small cut, bruise, scrape). No time off work needed. | | 1 | Insignificant | No injury, or very slight discomfort. | D. Calculating and Interpreting the Risk Score To find the overall risk level, we multiply the two ratings together.