Carrying out pattern development for marine applications
Overview
This standard identifies the competences you need for carrying out pattern developments and marking out of templates, prior to cutting and/or shaping plate material, in accordance with approved procedures. You will be required to select the appropriate materials and equipment to use, based on the information presented to you and the accuracy to be achieved. Pattern development techniques used will include parallel line, triangulation and radial line methods. Components to be marked out and developed will include irregular shapes, pipe elbows, segmented pipe bends, square-to-round transformers, T pieces, conical and elliptical sections.
Your responsibilities will require you to comply with organisational policy and procedures for the marking out and pattern development activities undertaken and to report any problems with the equipment, materials or pattern development activities that you cannot personally resolve, 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 carry out.
Your underpinning knowledge will provide a good understanding of your work and will provide an informed approach to pattern development activities. You will understand the marking out and pattern development process and its application and will know about the equipment, materials and processes to be carried out, in sufficient depth to provide a sound basis for carrying out the activities, correcting faults and producing the patterns and templates to the required specification.
You will understand the safety precautions required when carrying out the pattern development activities and when using the associated tools and equipment. You will be required to demonstrate safe working practices throughout and will understand the responsibility you owe to yourself and others in the workplace.
Performance criteria
You must be able to:
- work safely at all times, complying with health and safety and other relevant regulations, directives and guidelines
- obtain and use the correct information for marking out
- obtain the appropriate marking out equipment and check that it is in a usable condition
- prepare suitable datum's and marking out surfaces
- mark out using appropriate methods
- check that the marking out complies with the specification
- deal promptly and effectively with problems within your control and report those that cannot be resolved
- complete relevant documentation in line with organisational procedures
Knowledge and Understanding
You need to know and understand:
- the specific safety precautions to be taken when working in a marine fabrication environment, with sheet or plate materials, both on land and on board vessels (such as general workshop and site safety, appropriate personal protective equipment, accident procedure; statutory regulations, risk assessment procedures and relevant requirements of HASAWA, COSHH and Work Equipment Regulations)
the personal protective equipment (PPE) to be worn when carrying out the pattern development activities (such as leather gloves, eye/ear protection, safety helmets)
the correct methods of moving or lifting sheet or plate materials
- the hazards associated with marine fabrication work (such as handling sheet/fabricated components; using dangerous or badly maintained tools and equipment) and how they can be minimised
- how to obtain the necessary drawings, template specifications and job instructions
- 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
- how to carry out currency/issue checks of the specifications you are working with
- how to interpret first and third angle drawings, imperial and metric systems of measurement, workpiece reference points and system of tolerancing
- principles and techniques for pattern development (to include parallel line, radial line and triangulation methods)
- geometrical methods for developing of complex shapes (such as square-to-round, lobsterback sections) from sheet metal
- use of marking out conventions, datum edges/lines and centre lines
- the preparations to be carried out on the material prior to marking out, to enhance clarity, accuracy and safety
- the component material characteristics and process considerations to be taken into account when marking out templates
- allowances for joint and weld preparations for different materials and thicknesses
- how to calculate true lengths, bend allowances and circumferences
- the effective use and care of tools/instruments
- how to mark out and preserve the template for maximum clarity, accuracy and ease of transfer
- ways of laying out the shapes/patterns to maximise the use of plate or sheet material
- setting and adjusting tools (such as squares and protractors)
- how to transfer information to the underside of the sheet or plate
- the importance of checking the marked-out shape for dimensional accuracy before cutting the material
- 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
- the importance of clearly identifying the material part number and the manufacturing details on the marked out material or template
- the problems that can occur in marking out pattern developments and how these can be avoided
- the extent of your own responsibility and whom you should report to if you have problems that you cannot resolve
Scope/range
Scope Performance
Mark off developed shapes, using two types of pattern material from the following:
- template paper
- wood
- sheet metal
- cardboard
- other specific material
Develop patterns for plates and cylindrical shapes, for five of the following:
- elbows for pipe bends
- segment pipe bends
- hoppers (square-to-round)
- irregular shapes
- tee-pieces
- concentric cones
- offset cones
- truncated cones
- elliptical forms
- ball corner or spherical section
- fishplates
- bed plates
- gusset plates
- structural components
- seatings (such as tank cradles)
Use two of the following methods to obtain the required developed shape:
- parallel line
- triangulation
- radial line
Mark off the developed shapes, using all of the following tools and instruments:
- scriber
- punch
- rule or tape
- straight edge
- square
- protractor
- dividers or trammels
- compass
- angle sets
Develop shapes, to include four of the following features:
- datums and centre lines
- square and rectangular shapes
- irregular shapes
- angles
- cutting and shaping detail and allowances
- circles
- bend/fold allowances
- hole centres and outlining
Produce developed patterns which meet all of the following standards:
- company/client specifications
- clearly defined work instructions
- dimensional accuracy meets drawing/specification tolerances
- marking out uses recognised conventions
Scope Knowledge
Values
Behaviours
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