Checking marine fabrications for quality and dimensional accuracy

This standard identifies the competences you need to carry out quality assurance checks on marine fabricated components/structural units, in accordance with approved procedures. You will be required to use appropriate drawings, specifications and quality assurance documentation during the quality checking activities. You will be required to select the appropriate inspection equipment, based on the features to be checked and the accuracy to be measured. This will involve checking that the appropriate equipment is within current test dates and where necessary, setting up and calibrating the equipment, ready for the inspection operations to be performed. 

In carrying out the quality assurance activities, you will be expected to check the components for both dimensional and geometrical accuracy and this may be required to be undertaken at various stages of manufacture, such as pre-assembly, intermediate and final assembly. Components to be inspected will include hull structure sections, double bottoms, deck panels and floor assemblies, girders and stiffeners, seatings, tanks and cylinders, posts, pillars and columns, cantilevers and pipe and tube trusses.

Your responsibilities will require you to comply with organisational policy and procedures for the quality assurance activities, seeking out relevant information for the activities undertaken and to report any problems with the inspection equipment or checking activities, that you cannot personally resolve, or are outside you personal 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 carry out.

Your underpinning knowledge will provide a good understanding of your work and will provide an informed approach to applying quality assurance procedures to marine fabricated products. You will understand the quality assurance process and its application and will know about the equipment and inspection techniques, in adequate depth to provide a sound basis for carrying out the activities to the required specification.

You will need to understand the safety precautions required when working with fabricated components and the safeguards necessary for undertaking the activities safely and correctly. You will be required to demonstrate safe working practices and procedures 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. follow and make appropriate use of the specifications for the product or asset being quality assured

3. use all the correct tools and inspection equipment and check that they are in useable condition

4. carry out the quality assurance in an appropriate sequence using approved methods and procedures
5. identify and assess any defects or variations from the specification and take appropriate action
6. report completion of compliance activities in line with organisational procedures 
7. complete relevant documentation in line with organisational procedures

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1. the specific safety precautions to be taken when carrying out quality assurance activities on marine fabricated components, both on land and on board vessels (including specific legislation or regulations governing the activities or work area, safe working practices and procedures to be adopted, general workshop safety practice, relevant requirements of HASAWA, COSHH and Work Equipment Regulations)
2. the personal protective equipment (PPE) that should be worn whilst carrying out the quality assurance activities 
3. the hazards associated with carrying out the inspection activities (such as working at height, handling fabricated structures, slips, trips and falls)
4. how and where to obtain the required drawings and related specifications
5. how to carry out currency/issue checks of the specifications you are working with
6. how to use and extract information from engineering drawings and related specifications (to include symbols and conventions to appropriate BS or ISO standards) in relation to work undertaken
7. how to interpret first and third angle drawings, imperial and metric systems of measurement
8. the visual and dimensional inspection methods and techniques that are used for checking marine fabrications
9. the selection and use of set datums (such as water lines, buttock lines, reference points, centre lines and check points)
10. the effects of taking readings from different datums (such as the accumulation of limits leading to errors)
11. the equipment that is used to carry out the various checks (such as rules and tapes, levels and plumb lines, laser equipment and theodolite)
12. the techniques used to check for alignments, verticality and roundness/ovality
13. the need to check that the equipment is approved for the inspection activities undertaken (including calibration checks and current certification dates)
14. the need to carry out the checks and record the results on the appropriate documentation
15. the calculations used to adjust survey results for temperature differences
16. how to calculate allowances for weld gaps and weld shrinkage, in order to attain overall global tolerances
17. the types of defect that can occur in the fabrications and how to check for them and recognise when they are present

18. the quality assurance documentation to be completed and the type of information to be recorded

19. the organisational reporting lines and procedures, line supervision and technical experts

20. 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. Carry out all of the following during the quality assurance operations:

   1. prepare the work area in readiness for the inspection activities
   2. obtain the correct drawings, specifications and quality control documentation
   3. obtain the approved inspection equipment and check that it is within the calibration date
   4. position and correctly set up the inspection equipment
   5. carry out the quality control operations, using safe and approved methods and techniques
   6. complete all required documentation, accurately and legibly
   7. leave the work area in a safe condition on completion of the activities

2. Carry out quality assurance inspection activities on eight of the following types of fabrications:

   1. hull unit structure sections
   2. shell and cover plates
   3. seatings/platforms
   4. bulkheads and fire walls
   5. cylindrical structures
   6. double bottom units
   7. girders/beams/transverses
   8. post/pillars/columns
   9. guards/uptakes
   10. tanks or containers
   11. deck panels/floor assemblies
   12. floor/bracket/stiffener structures
   13. tube/pipe trusses
   14. cantilevers
   15. other specific marine fabrications

3. Use appropriate datum/reference marks during the quality assurance activities, to include four of the following:

   1. centre lines
   2. datum lines       
   3. check points
   4. water lines        
   5. buttock lines
   6. reference points

4. Use five of the following instruments during the quality assurance compliance checks:

   1. dumpy level
   2. laser level
   3. templates and jigs        
   4. spirit level
   5. straight edge
   6. gauges/templates         
   7. water level
   8. theodolite
   9. dye penetrants 
   10. tape/rule
   11. square

5. Check all of the following during the quality assurance compliance checks:

   1. dimensional accuracy is within specified tolerances
   2. assemblies meet geometric tolerances for shape/visual appearance
   3. level and alignment are within specification
   4. hole centres/erection points are 'best fit'
   5. material quality meets requirements
   6. quality of welds/joints meet specification requirements
   7. all assemblies/units are correct and complete

6. Complete a quality assurance compliance report which establishes the state of the fabrications in all of the following categories:

   1. acceptable fabrications
   2. defective fabrications
   3. fabrications that require further work or examination

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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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28 Feb 2021

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Current

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Original

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Semta

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SEMME3065

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Marine Engineering Trades

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5235

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engineering; marine; check; fabrications; quality; structures; accuracy; inspection; methods; equipment

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