Lining off for assembly and erection of marine steelwork and components

This standard identifies the competences you need to line off, in accordance with approved procedures. You will be required to select the required lining-off tools and equipment, based on the information presented to you and the accuracy to be achieved. Lining off will be the preparation required for assembly and erection of structural steelwork, sub-assemblies, major assemblies and the positioning and alignment of other marine components and will include establishing and lining off workpiece datums, centre lines, angles, regular and irregular details.

Your responsibilities will require you to comply with organisational policy and procedures for the lining-off activities undertaken and to report any problems with the materials, equipment or lining-off activities that you cannot resolve yourself, or are outside your permitted authority, to the relevant people. You will be expected to work with a minimum of supervision, taking personal responsibility for your own actions and for the quality and accuracy of the work that you produce. **     

Your underpinning knowledge will provide a good understanding of your work and will provide an informed approach to applying lining-off procedures in a marine steelwork environment. You will understand the lining-off process and its application and will know about the materials as well as the care and use of tools, in adequate depth to provide a sound basis for carrying out the activities, correcting faults and ensuring that the work is carried out to the required specification.

You will understand the safety procedures required when working a marine steelwork environment and when carrying out the lining-off activities. You will be required to demonstrate safe working practices throughout and will understand the responsibilities you owe to yourself and others in the workplace.

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1. work safely at all times, complying with health and safety and other relevant regulations, directives and guidelines

2. obtain and use the correct information for lining off

3. obtain the appropriate lining off equipment and check that it is in a usable condition

4. prepare suitable datums and lining off surfaces
5. line off using appropriate methods
6. check that the lining off complies with the specification
7. deal promptly and effectively with problems within your control and report those that cannot be resolved

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1. the specific safety precautions to be taken when carrying out lining-off activities in a marine steelwork environment (including general workshop and site safety, appropriate personal protective equipment, accident procedure; statutory regulations, risk assessment procedures and COSHH regulations)

2. the personal protective clothing and equipment (PPE) to be worn when carrying out the lining-off and fabrication activities (such as leather gloves, eye/ear protection, safety helmets)

3. the hazards associated with lining off marine components (such as working in a marine structural steelwork environment, lifting and handling sheet/fabricated components, slivers/burrs on sheet materials, using marking out mediums, using laser marking out equipment, working at height) and how they can be minimised

4. the procedures to be adopted to obtain the necessary drawings and job instructions
5. how to extract information from engineering drawings and related specifications (to include symbols and conventions to appropriate BS or ISO standards) in relation to work undertaken
6. how to interpret first and third angle drawings, imperial and metric systems of measurement, workpiece reference points and system of tolerancing
7. how to carry out currency/issue checks of the specifications you are working with
8. principles of lining off
9. the importance of datum lines and why all measurements must be taken from these datums (including accumulation of errors and how this can effect the overall assembly)
10. the various lining-off tools and equipment that can be used for the lining-off activities
11. use of marking out conventions, datum edges/lines and centre lines
12. lining off and transferring information from templates
13. the importance of using tools only for the purpose intended; the care that is required when using the equipment and tools; the proper way of preserving and storing tools and equipment between operations
14. the need for clear and dimensional accuracy in lining off to specifications/drawings
15. the problems that can occur in lining off the marine components and how these can be avoided
16. the extent of your own responsibility and whom you should report to if you have problems that you cannot resolve

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1. Interpret drawings and line off plate and sections to the required dimensions for two of the following:

   1. positional lines/alignment
   2. structural datum/centre lines
   3. final unit dimensional sizes

2. Line off required locations/positions for three of the following:

   1. bulkheads/partitions
   2. major unit erection
   3. access/penetration openings
   4. sub-assembled units
   5. machinery/seatings/equipment

3. Line off onto plate or sections from drawings, using all of the following tools and instruments:

   1. scriber
   2. punch
   3. rule and tape
   4. straight edge
   5. square
   6. protractor
   7. dividers or trammels
   8. chalk line
   9. templates
   10. laser (where applicable)

4. Line off material, to include three of the following:

   1. square/rectangular shapes
   2. irregular shapes
   3. angles
   4. circular shapes

5. Ensure completed lining off meets all of the following requirements:

   1. company/client standards
   2. dimensionally accurate (to drawing or specification)
   3. clearly defined for required processes
   4. uses recognised lining-off conventions

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Behaviours:

You will be able to apply the appropriate behaviours required in the workplace to meet the job profile and overall company objectives, such as:

• strong work ethic
• positive attitude
• team player
• dependability
• responsibility
• honesty
• integrity
• motivation
• commitment

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3

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2021

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Current

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Original

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Semta

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SEMME3053

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Marine Engineering Trades

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5235

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engineering; marine; lining off; assembly; erection; steelwork; components; bulkhead; major units; openings

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