Refrigeration And Air Conditioning  ·  Level 5
Workshop Practice
Chapter 2: Perform required basic metal works
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⚑ What you will be able to do

By the end of this chapter, you will be able to:

  • Wear the right personal protective equipment and follow safety rules to keep yourself safe at all times.
  • Use materials carefully to avoid waste and maintain a safe working environment.
  • Store tools, equipment, and recyclable materials properly according to workplace guidelines.
  • Clean and clear your worksite safely, following occupational safety and health regulations.
  • Follow work instructions closely to ensure safety and quality throughout your tasks.
  • Accurately mark out and check dimensions against drawings to meet job specifications.
  • Securely clamp work pieces to prevent damage and accidents while working.
  • Perform basic metalworking tasks like cutting, chipping, filing, drilling, and joining safely and correctly to the required standards.

Mastering these skills helps you work confidently and safely, producing quality metalwork that meets real-world job demands.

Performing basic metal works is a fundamental skill applicable across many professional fields, including healthcare equipment maintenance, agricultural machinery repair, hospitality facility management, and business infrastructure upkeep. Understanding how to work safely with metals ensures that professionals contribute effectively to their organizations while preserving their own well-being. This chapter introduces essential personal protective equipment and safety procedures that safeguard workers during metalworking tasks, reflecting the practical demands faced in diverse Kenyan workplaces such as county hospitals, universities, SACCOs, and retail businesses.

1.1 Appropriate PPEs and Safety Procedures Are Applied in Line With

In metalworking environments, the risk of injury is significant due to sharp tools, flying particles, heat, and electrical hazards. Kenyan workplaces ranging from county government workshops to hotel maintenance departments emphasize strict adherence to Personal Protective Equipment (PPE) and safety protocols to prevent accidents and ensure compliance with occupational safety regulations. This section breaks down the essential PPE required, safety procedures to follow, and the rationale behind these practices to cultivate a safe working culture.

1.1.1 Essential Personal Protective Equipment for Metal Works

Personal Protective Equipment (PPE) forms the first line of defense against hazards encountered in metalworking. Proper selection and use of PPE reduce the risk of cuts, burns, eye injuries, and respiratory issues that can arise during cutting, welding, grinding, or shaping metals. Organizations such as county referral hospitals and universities mandate PPE usage to protect staff engaged in workshop activities.

Components of Essential PPE

  • Safety Goggles or Face Shields: Protect the eyes and face from sparks, metal shards, and harmful light during welding or grinding. Safety goggles should be impact-resistant and fit securely to prevent foreign objects from entering.
  • Protective Gloves: Heat-resistant and cut-resistant gloves shield hands from hot surfaces and sharp edges. For example, in a retail business repair shop, gloves prevent injuries when handling sheet metal.
  • Ear Protection: Ear plugs or earmuffs reduce exposure to loud noises generated by power tools, preventing long-term hearing damage in noisy workshop environments such as university engineering labs.
  • Protective Clothing: Flame-resistant aprons or overalls protect the body from sparks and hot metal splashes. Workers at county government offices performing metal repairs commonly wear these garments.
  • Safety Boots: Steel-toed boots prevent foot injuries from falling heavy objects or stepping on sharp materials. Hotels with maintenance teams require such footwear to ensure staff safety during metalwork tasks.

1.1.2 Safety Procedures for Handling Metalworking Tools and Equipment

Safe handling of tools and equipment is critical to preventing accidents in metalworking. Kenyan institutions such as SACCO maintenance units and agricultural cooperatives implement standard operating procedures that emphasize care and attention when using cutting, welding, and grinding tools.

Key Safety Procedures

  • Pre-Use Inspection: Check tools for damage or wear before use to avoid malfunction. For instance, a county hospital workshop technician inspects welding cables for frays to prevent electric shocks.
  • Proper Tool Handling: Use tools for their intended purpose only and maintain a firm grip to prevent slips. Retail business maintenance staff are trained to handle grinders with both hands for stability.
  • Securing Workpieces: Clamp or secure metals firmly before cutting or shaping to avoid unexpected movement that can cause injury or poor-quality work.
  • Maintaining Clean Work Area: Remove flammable materials and ensure proper ventilation to reduce fire risks, especially relevant in hotel maintenance where welding may occur near combustible materials.
  • Emergency Preparedness: Know the locations of fire extinguishers, first aid kits, and emergency exits. County government workshops conduct regular drills to ensure readiness in case of accidents.

1.1.3 Compliance with Kenyan Occupational Health and Safety Regulations

Adherence to national safety standards ensures legal compliance and fosters a culture of safety in workplaces performing metalwork. Institutions such as universities and county hospitals align their workshop practices with the Occupational Safety and Health Act (OSHA) of Kenya.

Aspects of Regulatory Compliance

  • PPE Provision and Usage Enforcement: Employers must supply appropriate PPE and enforce its use among workers, as observed in university technical departments.
  • Risk Assessments: Regular evaluations of workshop hazards enable the implementation of preventive controls. SACCO offices with mechanical workshops conduct such assessments quarterly.
  • Training and Awareness: Continuous safety training equips workers with knowledge and skills to handle metalwork hazards effectively.
  • Incident Reporting and Investigation: Prompt reporting and analysis of accidents help identify root causes and prevent recurrence.
  • Record Keeping: Maintaining logs of safety inspections, training, and incidents is mandatory for regulatory audits and internal reviews.

1.1.4 Health Precautions and Environmental Safety Measures

Metalworking activities can expose workers to harmful fumes, dust, and noise, which have long-term health implications. Kenyan workplaces such as farms with machinery repair units and hospitals with biomedical workshops implement health and environmental safety measures to mitigate these risks.

Health and Environmental Safety Practices

  • Ventilation Systems: Use of exhaust fans and open windows to disperse welding fumes and metal dust, as practiced in county hospital workshops.
  • Use of Respirators: When ventilation is insufficient, respirators protect workers from inhaling hazardous particles.
  • Noise Control: Limiting exposure time and using ear protection minimize hearing loss risks.
  • Proper Waste Disposal: Collecting metal scraps and hazardous waste separately prevents environmental contamination, a standard in university workshops.
  • Regular Health Checks: Monitoring workers’ respiratory and auditory health ensures early detection of occupational illnesses.

Practice Questions

  1. Explain why safety goggles are essential during metal grinding and welding operations. (5 marks)

  2. Describe six safety procedures to follow when handling metalworking tools in a workshop. (12 marks)

  3. Outline five key requirements of the Occupational Safety and Health Act (OSHA) of Kenya relevant to metalworking workshops. (10 marks)

  4. Discuss five health precautions that should be taken to protect workers from hazards associated with metalworking fumes and noise. (10 marks)

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🔒4.1 Work instructions are followed to ensure work safety

In every workplace across Kenya, following work instructions is vital for maintaining safety standards, especially in environments where metal works are performed. Whether in a county referral hospital’s maintenance workshop, a university’s technical departmen…

🔒4.1 Dimensions are marked out according to job requirements

In metalworking, accurate marking out of dimensions is a critical step that determines the success of the fabrication process. This task involves transferring the design measurements onto the metal stock to guide subsequent operations such as cutting, bending,…

🔒1.1 Dimensions are checked against the actual drawings

In workshop practice, verifying that the dimensions of fabricated metal components align precisely with the original technical drawings is crucial. This ensures that the finished product meets design specifications and fits correctly within larger assemblies o…

🔒1.1 Work Pieces Are Clamped in Work Holding Device to Avoid

In various professional environments across Kenya, from county hospitals to agricultural cooperatives, securing work pieces during metalwork is essential to ensure safety, precision, and efficiency. Work holding devices are used to firmly grip the metal pieces…

🔒4.1 Basic metal works are performed applying knowledge on safety

Basic metal work involves cutting, shaping, joining, and finishing metal materials to create functional or decorative items. In Kenya’s diverse professional settings, from county hospitals maintaining surgical instruments to retail businesses fabricating displ…

🔒1.1 Work Pieces Are Cut, Chipped or Filed According to Required

In many Kenyan industries, from county hospitals maintaining metal medical equipment to retail businesses fabricating display racks, the ability to accurately cut, chip, or file metal work pieces is essential. These processes shape and prepare metal components…

🔒2.1 Drilling is Performed According to Recommended Sequence and Procedures

Drilling is a fundamental metalworking process used in various Kenyan industries, including manufacturing, maintenance workshops, and even in agricultural machinery repairs. Performing drilling according to the correct sequence and procedures ensures precision…

🔒Joining is performed as per job requirements

In various Kenyan workplaces, the ability to join metal components effectively is critical across multiple sectors including manufacturing, maintenance, and construction. Whether in a county hospital workshop repairing medical trolleys, a hotel maintenance dep…

🔒2.1 Proper Usage of Materials as Per Workplace

In any professional workshop or work environment, especially in Kenya’s diverse sectors such as healthcare, education, and agriculture, the proper usage of materials is fundamental to achieving quality outcomes, minimizing waste, and controlling costs. Whether…

🔒1.1 Tools, Equipment and Recyclable Materials Are Stored In

In Kenyan workplaces across various sectors such as county hospitals, retail businesses, and universities, proper storage of tools, equipment, and recyclable materials is fundamental to maintaining workplace safety, efficiency, and sustainability. Organized st…

🔒2.1 Worksite is cleaned and cleared in accordance with OSH

Proper cleaning and clearing of the worksite after metalworking activities is essential to maintain a safe, efficient, and hazard-free environment. In Kenyan workplaces such as county government offices or large retail businesses, failure to adhere to Occupati…

Chapter Summary

This chapter emphasizes the importance of selecting and using appropriate personal protective equipment and following safety procedures to maintain a safe working environment. It highlights the need to adhere strictly to work instructions to ensure safety throughout metalworking tasks. Accurate marking of dimensions based on job requirements is essential, followed by careful verification against the actual drawings to guarantee precision. Securing work pieces firmly in work holding devices prevents movement and enhances safety during operations. The chapter covers basic metalworking techniques such as cutting, chipping, and filing, stressing the application of safety knowledge at each step. Drilling operations are conducted following the recommended sequence and guidelines to achieve the desired results. Joining processes are performed according to specific job requirements while observing proper material usage and workplace standards. Finally, the chapter underlines the importance of organizing tools, equipment, and recyclable materials properly, as well as cleaning and clearing the worksite in compliance with occupational safety and health regulations.

Self-Assessment

🔒 PDFDownload this self-assessment, with answers

A. Written Assessment

  1. Which personal protective equipment (PPE) is essential when performing basic metal cutting? (2 marks)
  2. Explain why following work instructions is critical for safety in workshop practice. (3 marks)
🔒20 more in this section.

Chapter Examination Questions

🔒 PDFDownload these examination questions, with worked answers

SECTION A (40 Marks) - Answer ALL Questions

  1. Identify five types of personal protective equipment (PPE) commonly used in metal workshop activities and explain their specific purpose in ensuring safety. (4 marks)
  2. Describe the importance of following work instructions during metal fabrication tasks in a county government workshop. (4 marks)
🔒18 more in this section.

Chapter Practical Activities

Practical 1: Marking Out Metal Components to Specified Dimensions

Refrigeration And Air Conditioning · Level 5
Workshop Practice
PRACTICAL ASSESSMENT
TIME: 4 HOURS
⬇ PDFCandidate Instructions (Candidate Tool)

Type: Individual

INSTRUCTIONS TO CANDIDATE:
1.  You are required to perform the following task:
i.  Mark out a steel flat bar 300mm long, 50mm wide, and 6mm thick with two holes of 12mm diameter spaced 200mm apart.
2.  You have been provided with the following resources for the practical task:
Tools & EquipmentMaterials
Try squareSteel flat bar 300mm x 50mm x 6mm
Steel rule 300mmMarking blue (Dykem)
Scriber
Center punch
Hammer (450g)
⬇ PDFResources Required (Cutting List)
S/NItemQuantity
1Steel flat bar 300mm x 50mm x 6mm1 Pc per Candidate
2Steel square bar 50mm x 50mm x 6mm1 Pc per Candidate
3Try square1 Pc per Candidate
4Steel rule 300mm1 Pc per Candidate
5Scriber1 Pc per Candidate
6Center punch1 Pc per Candidate
7Hammer (450g)1 Pc per Candidate
8Surface plate1 Pc per Workstation
9PPE (overall, safety boots, safety goggles, gloves)1 Set per Candidate
10Marking blue (Dykem)1 Bottle per 3 Candidates
⬇ PDFAssessor Guide
Items to be EvaluatedMarks AvailableMarks ObtainedComments
TASK 1: Preparation and Safety
Wore appropriate PPE (overall, safety boots, safety goggles, gloves)
(Award 1 mark for correct PPE worn or zero)
1
Selected correct tools and materials as per task requirements
(Award 1 mark for correct selection or zero)
1
Sub-Total2
TASK 2: Marking Out Process
Cleaned the steel flat bar and applied marking blue evenly
(Award 1 mark for proper surface preparation or zero)
1
Measured and marked the length of 300mm accurately using steel rule and try square
(Award 2 marks for accurate measurement or zero)
2
Marked the width of 50mm accurately using try square and steel rule
(Award 2 marks for accurate width marking or zero)
2
Marked the location of two holes of 12mm diameter spaced 200mm apart on the flat bar
(Award 3 marks for correct hole spacing and marking or zero)
3
Used center punch and hammer to mark hole centers clearly
(Award 2 marks for correct use of center punch or zero)
2
Sub-Total10
TASK 3: Tool Handling and Workshop Safety
Handled tools properly and safely throughout the marking process
(Award 2 marks for safe handling or zero)
2
Maintained clean and organized work area during and after marking
(Award 1 mark for housekeeping or zero)
1
Sub-Total3
PRODUCT CHECKLIST
Steel flat bar marked to 300mm length and 50mm width within ±1mm tolerance
(Award 3 marks for dimensional accuracy or zero)
3
Two holes marked with 12mm diameter centers spaced 200mm ±1mm apart
(Award 4 marks for hole marking accuracy or zero)
4
Markings are clear, neat, and unambiguous for fabrication
(Award 3 marks for clarity and neatness or zero)
3
Sub-Total10
GRAND TOTAL25
ASSESSMENT OUTCOME:   ☐ Competent    ☐ Not Yet Competent (competent if at least 50%)

Practical 2: Cut metal sheet to specified dimensions

Refrigeration And Air Conditioning · Level 5
Workshop Practice
PRACTICAL ASSESSMENT
TIME: 4 HOURS
⬇ PDFCandidate Instructions (Candidate Tool)

Type: Individual

INSTRUCTIONS TO CANDIDATE:
1.  You are required to perform the following task:
i.  Cut a mild steel sheet 3mm thick to a rectangular piece measuring 400mm x 250mm.
2.  You have been provided with the following resources for the practical task:
Tools & EquipmentMaterials
Measuring tapeMetal sheet 3mm thick, mild steel
Try square
Center punch
Hack saw with blades
Bench vice
Metal file
Marker/soapstone
⬇ PDFResources Required (Cutting List)
S/NItemQuantity
1Metal sheet 3mm thick, mild steel500mm x 500mm per Candidate
2Measuring tape1 Pc per Candidate
3Try square1 Pc per Candidate
4Center punch1 Pc per Candidate
5Hack saw with blades1 Pc per Candidate
6Bench vice1 Pc per Work station
7Metal file1 Pc per Candidate
8Marker/soapstone1 Pc per Candidate
9Safety goggles1 Pair per Candidate
10Leather gloves1 Pair per Candidate
11Dust coat/overall1 Pc per Candidate
12Safety boots1 Pair per Candidate
⬇ PDFAssessor Guide
Items to be EvaluatedMarks AvailableMarks ObtainedComments
TASK 1: Preparation and Safety
Wore appropriate PPE: dust coat/overall, safety boots, safety goggles, and gloves
(Award 1 mark for correct PPE or zero)
1
Handled tools and equipment safely and as per workshop procedure
(Award 1 mark for correct tool handling and 1 mark for observing safety or zero)
2
Measured and marked the metal sheet accurately using measuring tape, try square, and marker
(Award 1 mark each for correct measurement, marking, and use of try square or zero)
3
Used center punch correctly to mark cutting points
(Award 1 mark for correct use or zero)
1
Sub-Total7
TASK 2: Cutting and Finishing
Secured the metal sheet properly in the bench vice
(Award 1 mark for proper securing or zero)
1
Cut the metal sheet accurately along the marked lines using a hack saw
(Award up to 4 marks for neat, straight, and accurate cutting or zero)
4
Deburred and filed edges to remove sharpness and achieve smooth finish
(Award 1 mark for filing each edge or zero)
2
Cleaned the work area and stored tools properly after completion
(Award 1 mark for proper housekeeping or zero)
1
Sub-Total8
PRODUCT CHECKLIST
Finished metal piece cut to 400mm x 250mm with ±2mm tolerance
(Award 3 marks for accurate dimensions or zero)
3
Edges are smooth, free from burrs, and not sharp
(Award 2 marks for smooth edges or zero)
2
Metal piece is flat and not warped
(Award 2 marks for flatness or zero)
2
Cut edges are straight and square to each other within ±1°
(Award 3 marks for squareness or zero)
3
Sub-Total10
GRAND TOTAL25
ASSESSMENT OUTCOME:   ☐ Competent    ☐ Not Yet Competent (competent if at least 50%)
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🔒Filing and Finishing Metal Edges to 150mm x 50mm Mild Steel PlatePractical 3
🔒Drilling holes in a 200mm x 150mm mild steel platePractical 4
🔒Bend a Mild Steel Bar to a 90-Degree AnglePractical 5
🔒Assemble a riveted metal bracket 150mm x 100mm as per the provided drawingPractical 6
🔒Assemble a metal frame 1200mm x 800mm by boltingPractical 7
🔒Tack Welding Basic Metal JointsPractical 8
🔒Measuring and Checking Metal Work AccuracyPractical 9
🔒Cleaning and preparing a 500mm x 300mm mild steel plate for welding or paintingPractical 10
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Am I competent?

At the start of this chapter we promised you would be able to:

  • Wear the right personal protective equipment and follow safety rules to keep yourself safe at all times.
  • Use materials carefully to avoid waste and maintain a safe working environment.
  • Store tools, equipment, and recyclable materials properly according to workplace guidelines.
  • Clean and clear your worksite safely, following occupational safety and health regulations.
  • Follow work instructions closely to ensure safety and quality throughout your tasks.
  • Accurately mark out and check dimensions against drawings to meet job specifications.
  • Securely clamp work pieces to prevent damage and accidents while working.
  • Perform basic metalworking tasks like cutting, chipping, filing, drilling, and joining safely and correctly to the required standards.

Tick each one you can genuinely do.

So, are you there yet?

You're competent when you can confidently do 50% or more of what this chapter promised.

Sign in to record how you're doing.