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Chemical Engineering  ·  Level 6
Engineering Drawing And Design
Chapter 8: Prepare Assembly Drawing
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Engineering drawing is vital in chemical engineering for creating detailed visual representations of equipment and systems. Assembly drawings are especially important because they show how individual components fit together to form complete machinery or installations, such as reactors, pumps, or heat exchangers. These drawings facilitate communication between design engineers, manufacturers, and site technicians, ensuring that chemical plant equipment is assembled correctly and functions safely.

8.1 Types of Assembly Drawings

Assembly drawings come in various forms tailored to convey different aspects of the assembled equipment. In chemical engineering, precise assembly drawings help avoid costly errors during installation of complex units like distillation columns or piping systems. This section explores orthographic views, sectional views, parts lists, and the use of AutoCAD for producing assembly drawings.

8.1.1 Orthographic Views

Orthographic views are the foundation of assembly drawings, representing three-dimensional objects in two dimensions. These views display the object from standard angles, front, top, side, allowing clear understanding of component placement without distortion.

  • Purpose: Orthographic views provide exact shape and size details of each component in the assembly, crucial for chemical plant equipment like pumps and valves.
  • Views Included: Typically, front, top, and side views are drawn to fully describe the assembly. Additional views may be added if needed.
  • Projection Method: First-angle or third-angle projection is used depending on standards; in Kenya, BS EN ISO 5456-2 recommends third-angle projection for consistency.
  • Scale: Assembly drawings often use scales such as 1:5 or 1:10 to balance detail and overall equipment size.
  • Dimensioning: All relevant dimensions such as bolt hole spacing, flange diameters, and pipe lengths are clearly marked to guide assembly.

8.1.2 Sectional Views

Sectional views reveal the interior construction of assemblies by cutting through parts to show hidden details. This is critical for chemical engineering assemblies where internal features like gaskets, seals, and internal passages affect performance.

  • Purpose: To expose internal components or complex joints not visible in orthographic views, aiding fabrication and inspection.
  • Types: Full section (cut through entire assembly), half section (cut through half to show internal and external simultaneously), or broken-out section (partial cut).
  • Section Lines: Hatch patterns indicate cut surfaces. The choice of line style and angle follows BS 8888 standards to differentiate materials.
  • Detailing: Sectional views include annotations for internal features such as thread types on bolts or packing in pumps.
  • Use Case: For example, a sectional view of a chemical reactor assembly would show internal baffles and heat exchanger tubes.

8.1.3 Parts List

A parts list, or bill of materials (BOM), accompanies assembly drawings to itemize every component required for the assembly. This list is essential in chemical engineering projects to ensure all parts are procured and correctly specified.

  • Content: Includes item number, part name, material specification, quantity, and sometimes supplier details.
  • Function: Helps procurement teams order correct materials like stainless steel pipes or gasket materials appropriate for chemical resistance.
  • Format: Usually tabulated and placed adjacent to the assembly drawing or on a separate sheet.
  • Cross-Referencing: Each item in the parts list corresponds to a numbered callout on the drawing for easy identification.
  • Importance: Accurate parts lists prevent assembly delays and ensure compliance with safety and operational standards.

8.1.4 Assembly Drawings Using AutoCAD

AutoCAD is widely used in Kenya’s chemical engineering sector to create precise and editable assembly drawings. The software enhances accuracy and streamlines revisions during design iterations.

  • Features: AutoCAD supports layering, annotation, dimensioning, and insertion of standard symbols compliant with BS/ISO standards.
  • Efficiency: Enables quick modifications when design changes occur, such as altering flange sizes or repositioning support brackets.
  • 3D Capabilities: Though primarily 2D drawings are used, AutoCAD’s 3D modeling assists in visualizing complex assemblies before fabrication.
  • File Management: Digital drawings facilitate sharing with manufacturers and contractors via common formats like DWG or PDF.
  • Training: Chemical engineering professionals in Kenya benefit from mastering AutoCAD to meet industry demands for precise and standardized documentation.

Practice Questions

  1. Explain the significance of orthographic views in chemical engineering assembly drawings and how they support equipment fabrication. (10 marks)
  2. Describe three types of sectional views and their applications in chemical plant assemblies. (12 marks)
  3. Outline the key components of a parts list and discuss why it is critical in chemical engineering projects. (8 marks)
  4. Discuss the advantages of using AutoCAD software for preparing assembly drawings in the chemical engineering field. (10 marks)

Chapter Summary

This chapter focused on preparing assembly drawings, beginning with an overview of the different types used in engineering design. Orthographic views were explained as essential for showing multiple perspectives of an assembly to convey accurate spatial relationships. Sectional views were introduced to reveal internal features that are not visible in standard views, enhancing clarity in complex assemblies. The importance of including a detailed parts list was emphasized to identify each component clearly and facilitate the assembly process. Practical guidance on creating assembly drawings using AutoCAD was provided, highlighting the software’s tools for precision and efficiency. Throughout, the chapter stressed adherence to drawing standards to ensure consistency and communication effectiveness. By mastering these aspects, students are equipped to produce comprehensive and professional assembly drawings.

Self-Assessment

🔒 PDFDownload this self-assessment, with answers

A. Written Assessment

  1. Which type of assembly drawing is best suited for showing hidden internal features of a chemical reactor? (2 marks)
  2. Identify the standard line type used for sectioning in assembly drawings according to BS 8888. (2 marks)
  3. List three essential components included in a parts list for an assembly drawing of a distillation column. (3 marks)
  4. Explain the purpose of orthographic views in assembly drawings for chemical plant equipment. (3 marks)
  5. In AutoCAD, which command is typically used to create a sectional view from an orthographic drawing? (2 marks)
  6. What is the recommended scale range for assembly drawings of piping systems in a chemical processing plant? (2 marks)
  7. Describe the difference between a full section and a half section view in assembly drawings. (3 marks)
  8. How does a parts list improve maintenance operations in a chemical engineering facility? (3 marks)
  9. State two advantages of using AutoCAD for preparing assembly drawings in chemical engineering projects. (2 marks)
  10. What information must be included in the title block of an assembly drawing for a heat exchanger? (3 marks)
Show Answers
  1. Sectional views are best for showing hidden internal features such as baffles and tubes inside a chemical reactor. Sectioning reveals interior details not visible in external views.
  2. The standard line type for sectioning is a thin, evenly spaced diagonal hatch line (section lines) as per BS 8888.
  3. Typical parts list components: part number, description (e.g., flange, gasket, bolt), quantity, material specification.
  4. Orthographic views provide accurate multiple-angle projections (front, top, side) to fully describe the shape and arrangement of components in the assembly.
  5. The “SECTIONPLANE” command in AutoCAD is used to create sectional views from orthographic drawings.
  6. Recommended scale is usually between 1:10 to 1:50 depending on the complexity and size of the piping system.
  7. A full section cuts through the entire object, showing the complete interior, while a half section cuts through only half, showing exterior and interior simultaneously.
  8. A parts list facilitates quick identification and ordering of replacement parts, reducing downtime during maintenance.
  9. AutoCAD allows precise dimensioning and easy modification of drawings, and supports layering for organizing complex chemical plant components.
  10. Title block must include drawing title, drawing number-scale, date, drafter’s name, checker’s name, and approval signature.

B. Oral Assessment

  1. Discuss how sectional views enhance the clarity of assembly drawings for complex chemical equipment such as heat exchangers.
  2. Explain the role of AutoCAD in improving the efficiency of preparing assembly drawings for chemical plant projects compared to manual drafting.
Answer Guide

Question 1 key points:

  • Sectional views reveal internal structure and hidden components that orthographic views cannot show clearly.
  • They help in understanding assembly relationships and facilitate fabrication and maintenance.

Question 2 key points:

  • AutoCAD allows faster revisions, precise measurements, and layering to separate components.
  • It supports standard templates and easy sharing, improving collaboration and reducing errors in chemical plant design.

C. Case Study

The Kenya Pipeline Company is upgrading a crude oil storage terminal by installing new pump assemblies.

Tasks:
a) Prepare a step-by-step procedure to create an assembly drawing showing orthographic and sectional views of the pump assembly using AutoCAD. (10 marks)
b) Develop a comprehensive parts list for the pump assembly, including all fasteners and seals. (6 marks)
c) Explain how the assembly drawing and parts list will assist the maintenance team during routine inspections. (4 marks)

Suggested Approach

a)

  1. Set up drawing parameters and title block according to BS 8888.
  2. Import or create detailed component drawings of the pump parts.
  3. Arrange orthographic views (front, top, side) of the assembly.
  4. Use the SECTIONPLANE command to generate sectional views showing internal parts like impellers and shaft seals.
  5. Add dimensions, labels, and symbols consistent with chemical engineering standards.
  6. Layer components logically for clarity.
  7. Insert a parts list table linked to the components.
  8. Review and save the drawing with appropriate scale (e.g., 1:20).

b)

  • List all components with part numbers, descriptions (e.g., impeller, casing, shaft, mechanical seal, bolts, nuts), quantities, and material specifications.
  • Include standard fasteners and sealing elements critical to pump operation.

c)

  • The assembly drawing provides a visual reference for component locations and connections, aiding troubleshooting.
  • The parts list enables quick identification and procurement of replacement parts, reducing downtime during maintenance.

Chapter Examination Questions

🔒 PDFDownload these examination questions, with worked answers

SECTION A (40 Marks) - Answer ALL Questions

  1. Explain the purpose of an orthographic assembly drawing in the design of a chemical reactor vessel at a refinery. (4 marks)
  2. Describe how sectional views improve the clarity of assembly drawings for a distillation column internals. (4 marks)
  3. List three key components typically included in the parts list of a chemical dosing pump assembly drawing. (4 marks)
  4. Identify the standard line types used in BS 8888 for hidden edges and cutting planes in assembly drawings. (4 marks)
  5. Describe the role of title blocks in chemical plant assembly drawings and list at least three details they must contain. (4 marks)
  6. Explain how layering in AutoCAD can be used to differentiate between various components in a heat exchanger assembly drawing. (4 marks)
  7. What scale would be appropriate for an assembly drawing of a large-scale chemical mixer and why? (4 marks)
  8. Describe the steps to create a sectional view of a packed bed reactor assembly using AutoCAD. (4 marks)
  9. Explain the importance of dimensioning in assembly drawings for chemical processing equipment. (4 marks)
  10. Discuss how assembly drawings can aid maintenance teams in chemical plants such as those operated by Kenya Pipeline Company. (4 marks)
Section A - Answers
  1. Orthographic assembly drawings provide multiple 2D views (front, top, side) to accurately represent the spatial arrangement of parts in a chemical reactor vessel, aiding fabrication and installation.
  2. Sectional views expose internal features of distillation column internals such as trays and downcomers that are hidden in orthographic views, enhancing understanding of component fit and function.
  3. Typical parts list components: pump casing, impeller, shaft, seals, bearings, fasteners.
  4. Hidden edges use dashed lines; cutting planes use thick dashed or phantom lines as per BS 8888.
  5. Title blocks identify drawing title, project name, drafter, date-scale, and revision status, ensuring traceability and version control.
  6. AutoCAD layering allows isolating parts, for example, valves on one layer and piping on another, improving clarity and editing efficiency.
  7. A scale of 1:20 or 1:10 is suitable to show sufficient detail while maintaining manageable drawing size for a large mixer.
  8. Steps include: draw cutting plane line on orthographic view, generate sectional view by projecting cut features, hatch cut surfaces, label the section in AutoCAD.
  9. Dimensioning ensures precise fabrication and assembly by specifying sizes, locations, and tolerances of components.
  10. Assembly drawings provide maintenance teams with detailed layouts and part identification, facilitating repairs and replacements without guesswork.

SECTION B (60 Marks) - Answer any TWO Questions

Question 11 (Compulsory - 20 marks)
Kenya Pipeline Company plans to fabricate a new chemical dosing skid for a fuel additive system.
a) Prepare a step-by-step procedure to produce an orthographic assembly drawing for the skid using AutoCAD. (10 marks)
b) Explain how sectional views and parts lists will be integrated into the assembly drawing to enhance understanding and maintenance. (10 marks)

Question 12 (20 marks)
Describe the differences between exploded assembly drawings and conventional orthographic assembly drawings in the context of a chemical reactor nozzle assembly. Provide examples of when each type is preferable.

Question 13 (20 marks)
Using BS/ISO standards, outline the conventions for line types, dimensioning, and annotation that must be followed when preparing assembly drawings for a shell and tube heat exchanger.

Question 14 (20 marks)
Discuss the advantages and challenges of using AutoCAD for preparing assembly drawings of complex chemical processing equipment such as a continuous stirred tank reactor (CSTR). Include considerations for layering, scaling, and file management.

Section B - Answers

Question 11
a) Procedure:

  1. Collect all component details and dimensions of the dosing skid.
  2. Set up drawing template in AutoCAD with correct units and scale.
  3. Draw base frame orthographic views (front, top, side).
  4. Add pumps, valves, piping, and instrumentation in correct positions.
  5. Use layers to separate mechanical, electrical, and instrumentation components.
  6. Insert cutting planes where sectional views are required.
  7. Generate sectional views by projecting cut features and applying hatch patterns.
  8. Create parts list table detailing item numbers, part names, quantities, and materials.
  9. Add title block with project details and drawing metadata.
  10. Review and annotate drawing for clarity and compliance.

b) Sectional views reveal internal pipe routing and mounting details hidden in orthographic views, improving fabrication accuracy. Parts lists provide quick reference for procurement and maintenance, ensuring all components are accounted for and correctly identified.

Question 12
Exploded assembly drawings separate components spatially to show assembly sequence and part relationships, ideal for maintenance manuals. Orthographic assembly drawings provide precise dimensional and positional information, suitable for fabrication. Exploded views are preferable during training or repair, while orthographic drawings are used in manufacturing.

Question 13
BS/ISO standards require:

  • Continuous thick lines for visible edges, dashed for hidden edges.
  • Cutting plane lines as thick dashed or phantom lines with arrows.
  • Dimension lines with arrowheads, placed outside views, with clear numeric values.
  • Annotations with standard text height and font, aligned parallel to dimension lines.
  • Use of standard symbols for welds, surface finish, and tolerances.

Question 14
Advantages: Precise control over drawing elements, layering for component separation, easy revisions, and digital storage. Challenges: Steep learning curve, managing large file sizes, ensuring team-wide standardization, and potential software compatibility issues. Effective layering aids clarity; correct scaling ensures readable detail; file management avoids data loss.

References

  1. TVET CDACC - Engineering Drawing And Design Curriculum (Cycle 3, 2025)
  2. TVET CDACC - Engineering Drawing And Design Occupational Standards
  3. British Standard BS 8888: Technical Product Documentation and Specification (2017)
  4. ISO 128-20: Technical Drawings - General Principles of Presentation - Part 20: Basic Conventions for Lines (2001)

Chapter Practical Activities

Practical 1: Construct Orthographic Assembly Drawing of a Simple Chemical Valve

Time: 3 Hours | Type: Individual

Resources Required:

  • Laptop with AutoCAD 2022 installed
  • Sample chemical valve (ball valve) from a Nakuru-based chemical processing plant
  • Engineering drawing board and T-square
  • Scale ruler 1:2 and 1:5
  • PPE: Overall, safety boots

You are working as a trainee drafter at a chemicals manufacturing company in Nakuru that is updating its maintenance manuals.

Tasks:
i. Take measurements of the ball valve components using a vernier caliper
ii. Draft the orthographic views (front, top, side) of the valve assembly on drawing board using scale 1:2
iii. Recreate the same orthographic assembly drawing in AutoCAD, layering components appropriately
iv. Annotate the drawing with dimensions, title block, and revision block as per BS 8888 standards

Assessor Observation Criteria:

  • [ ] Accurate measurement and dimensioning of valve components
  • [ ] Correct projection of orthographic views
  • [ ] Use of proper line types and scales in manual and AutoCAD drawings
  • [ ] Complete and correctly formatted title block and annotations

Practical 2: Generate Sectional View of a Chemical Pump Assembly

Time: 2 Hours 30 Minutes | Type: Individual

Resources Required:

  • Laptop with AutoCAD 2022
  • Assembly drawing of a centrifugal chemical pump from a Kisumu sugar factory (provided as a PDF)
  • PPE: Safety boots

At a Kisumu sugar factory, you are tasked with preparing sectional views to assist mechanical engineers in pump maintenance.

Tasks:
i. Import the pump assembly drawing into AutoCAD
ii. Identify an appropriate cutting plane to reveal internal components
iii. Create a full sectional view showing internal parts such as impeller, shaft, and seals
iv. Label sectional areas and apply correct hatching patterns according to ISO 128 standards

Assessor Observation Criteria:

  • [ ] Correct placement of cutting plane line on the assembly drawing
  • [ ] Accurate creation of sectional view with hidden details removed
  • [ ] Proper use of hatching styles and patterns
  • [ ] Clear labeling of parts in the sectional view

Practical 3: Compile a Parts List for a Chemical Reactor Assembly

Time: 1 Hour 30 Minutes | Type: Group of 2

Resources Required:

  • Chemical reactor assembly drawing (hard copy) from a Nairobi pharmaceutical plant
  • Laptop with Microsoft Excel
  • PPE: None required

You are part of a design team at a Nairobi pharmaceutical plant tasked with preparing documentation for a new batch reactor.

Tasks:
i. Review the assembly drawing and identify all individual parts and fasteners
ii. Create a detailed parts list in Excel including part numbers, descriptions, quantities, and materials
iii. Cross-reference parts list with the assembly drawing by inserting reference balloons on the drawing manually
iv. Save and print the parts list with clear headings and formatting

Assessor Observation Criteria:

  • [ ] Completeness and accuracy of parts list matching the assembly drawing
  • [ ] Proper use of Excel features for tabulation and formatting
  • [ ] Clear and logical referencing of parts on the assembly drawing
  • [ ] Neatness and readability of printed parts list

Practical 4: Draft Exploded Assembly Drawing of a Chemical Mixer Using AutoCAD

Time: 3 Hours | Type: Individual

Resources Required:

  • Laptop with AutoCAD 2022
  • Sample chemical mixer components (agitator, shaft, motor housing) from a Meru agro-processing plant
  • PPE: Overall, safety boots

At a Meru agro-processing plant, you are assigned to prepare exploded assembly drawings for maintenance manuals.

Tasks:
i. Measure and sketch individual components of the chemical mixer
ii. Using AutoCAD, draft an exploded assembly drawing showing all parts spaced apart
iii. Include leader lines and part numbers referencing the parts list
iv. Apply layering and line types for clarity and professional presentation

Assessor Observation Criteria:

  • [ ] Accurate representation of components in exploded view
  • [ ] Correct use of leader lines and part numbering
  • [ ] Consistent layering and line conventions as per BS EN ISO 128
  • [ ] Overall clarity and professional layout of the drawing

Practical 5: Interpret and Annotate Orthographic Assembly Drawing of a Heat Exchanger

Time: 2 Hours | Type: Individual

Resources Required:

  • Orthographic assembly drawing of a shell and tube heat exchanger (provided hard copy) from a Naivasha geothermal plant
  • Drawing board, pencils-scale ruler
  • PPE: None required

You are an engineering assistant at a Naivasha geothermal plant tasked with preparing annotated drawings for the maintenance team.

Tasks:
i. Identify and label all main components on the orthographic views
ii. Add dimension lines and notes indicating materials and welding points
iii. Highlight any critical tolerances required on the assembly
iv. Prepare a neat, fully annotated drawing ready for maintenance use

Assessor Observation Criteria:

  • [ ] Correct identification and labeling of components
  • [ ] Accurate dimensioning and annotation of critical features
  • [ ] Use of standard drawing symbols and notes
  • [ ] Neatness and clarity of the final annotated drawing

Practical 6: Create an Assembly Drawing Title Block as per Kenya Bureau of Standards (KEBS) Guidelines

Time: 1 Hour | Type: Individual

Resources Required:

  • Laptop with AutoCAD 2022
  • KEBS drawing title block template (digital copy)
  • PPE: None required

You are preparing standardized assembly drawings for a chemical fertilizer company in Eldoret and must include a compliant title block.

Tasks:
i. Design a title block in AutoCAD incorporating KEBS requirements such as drawing number-scale, drafter, checker, and approval fields
ii. Insert the title block into a sample assembly drawing of a chemical dosing pump
iii. Save and print the drawing ensuring the title block is clear and legible

Assessor Observation Criteria:

  • [ ] Inclusion of all mandatory KEBS title block fields
  • [ ] Correct sizing and placement of the title block on the drawing sheet
  • [ ] Quality and clarity of printed title block
  • [ ] Consistency with KEBS drawing standards

Practical 7: Measure and Sketch a Sectional View of a Pipeline Flange Assembly

Time: 2 Hours | Type: Individual

Resources Required:

  • Sample pipeline flange assembly from a Mombasa oil refinery training workshop
  • Vernier caliper and steel rule
  • Drawing board, pencils, eraser
  • PPE: Gloves, safety boots

As a trainee engineer at the Mombasa oil refinery, you are required to produce a sectional sketch for the flange assembly used in chemical transport lines.

Tasks:
i. Measure key dimensions of the flange assembly components
ii. Sketch a sectional view showing bolt holes, gasket seating, and flange faces
iii. Dimension the sketch accurately and label all parts
iv. Indicate the cutting plane line on the orthographic sketch

Assessor Observation Criteria:

  • [ ] Accurate measurement and transfer of dimensions
  • [ ] Clear and correct sectional sketch with proper hatching
  • [ ] Correct labeling of parts and dimensions
  • [ ] Proper indication of cutting plane line

Practical 8: Convert a Hand-drawn Assembly Drawing into a CAD Model

Time: 3 Hours | Type: Individual

Resources Required:

  • Hand-drawn assembly drawing of a chemical dosing pump (provided)
  • Laptop with AutoCAD 2022
  • PPE: None required

You are an intern at a Nairobi water treatment plant tasked with digitizing legacy assembly drawings for chemical dosing pumps.

Tasks:
i. Scan or photograph the hand-drawn assembly drawing and import into AutoCAD as a reference
ii. Trace and redraw the assembly using appropriate layers and line types
iii. Add dimensions and title block according to ISO standards
iv. Save and submit the CAD file for review

Assessor Observation Criteria:

  • [ ] Accurate tracing and redrawing of assembly parts
  • [ ] Proper layering and line conventions
  • [ ] Complete and correct dimensioning
  • [ ] Inclusion of title block and annotations

Practical 9: Assemble and Draw a Bolt and Nut Joint Using Orthographic Projection

Time: 2 Hours | Type: Individual

Resources Required:

  • Sample M16 bolt and nut set from a Kisii chemical factory
  • Vernier caliper, steel ruler
  • Drawing board, pencils, eraser
  • PPE: Gloves, safety boots

At a Kisii chemical manufacturing facility, you are required to produce detailed orthographic assembly drawings of common fasteners.

Tasks:
i. Measure the bolt and nut components
ii. Draw front, side, and top orthographic views of the assembled joint
iii. Dimension all critical parts including thread length and bolt head size
iv. Label parts and indicate assembly instructions clearly

Assessor Observation Criteria:

  • [ ] Correct measurement and representation of bolt and nut
  • [ ] Proper orthographic projection of assembled joint
  • [ ] Accurate dimensioning and labeling
  • [ ] Clarity of assembly instructions on drawing

Practical 10: Prepare a Bill of Materials (BOM) from an Assembly Drawing Using Excel

Time: 1 Hour 30 Minutes | Type: Individual

Resources Required:

  • Assembly drawing of a chemical dosing system (hard copy) from a Kakamega agrochemical company
  • Laptop with Microsoft Excel
  • PPE: None required

You are working at a Kakamega agrochemical company and need to prepare procurement documentation for chemical dosing system components.

Tasks:
i. Identify all components and sub-assemblies from the assembly drawing
ii. List part numbers, quantities, descriptions, and unit costs in Excel
iii. Calculate total cost per item and overall assembly cost
iv. Format the BOM professionally and print for procurement use

Assessor Observation Criteria:

  • [ ] Completeness and accuracy of component listing
  • [ ] Correct calculation of total costs
  • [ ] Professional formatting and clarity of BOM
  • [ ] Logical organization matching assembly drawing references

Practical 11: Produce a Detailed Assembly Drawing of a Chemical Filter Housing

Time: 3 Hours | Type: Individual

Resources Required:

  • Laptop with AutoCAD 2022
  • Sample filter housing components from a Kisumu water purification plant
  • PPE: Overall, safety boots

At a Kisumu water purification plant, you are tasked with creating detailed assembly drawings for new chemical filter housings.

Tasks:
i. Measure and sketch all components of the filter housing
ii. Draft the assembly drawing showing orthographic views and an exploded view in AutoCAD
iii. Include a parts list keyed to the drawing with reference balloons
iv. Annotate the drawing with material specifications and welding symbols

Assessor Observation Criteria:

  • [ ] Accurate measurement and representation of components
  • [ ] Correct orthographic and exploded views with clear referencing
  • [ ] Complete and accurate parts list
  • [ ] Proper annotation of materials and welding symbols

Practical 12: Edit an Existing Assembly Drawing to Include Revision Notes and Update Parts List

Time: 2 Hours | Type: Individual

Resources Required:

  • Existing assembly drawing of a chemical dosing pump (digital AutoCAD file) from a Nakuru chemical plant
  • Laptop with AutoCAD 2022 and Microsoft Excel
  • PPE: None required

You are a junior drafter at a Nakuru chemical plant asked to update an outdated assembly drawing after design changes.

Tasks:
i. Open the existing AutoCAD assembly drawing and identify areas needing update
ii. Add revision notes and a revision block to the drawing sheet
iii. Update the parts list in Excel to reflect new or replaced components
iv. Save and submit the updated drawing and parts list for approval

Assessor Observation Criteria:

  • [ ] Accurate addition of revision notes and revision block
  • [ ] Correct updating of parts list consistent with drawing changes
  • [ ] Proper saving and file management
  • [ ] Clear and professional presentation of updates
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