Mark out to the required specification in engineering construction

Business Sectors (Suites): Fabricating Steel Structures (Plating),Installing Plant and Systems - Mechanical,Installing Plant and Systems - Pipefitting
Developed by: ECITB
Approved on: 10 Dec 2020


This standard is about marking out to the required specification within the occupations of mechanical fitting, pipefitting and fabricating steel structures in the engineering construction industry.

You will need to be able to mark out materials to specification as part of a standard preparation prior to undertaking further fabrication, shaping or fitting activities whilst adhering to health, safety and environmental legislation, regulations and safe working practices.
In the context of this standard, your responsibility is to interpret and work within given specifications, selecting techniques and making variations to achieve the best possible result.  In some cases, you may still be expected to refer to others for final authorisation, even though you remain responsible for identifying and implementing decisions. 

Who this standard is for
This standard is for mechanical fitters, pipefitters and platers.

Performance criteria

You must be able to:

  1. work safely at all times, complying with health, safety, environmental and other relevant legislation, regulations, guidelines and local rules or procedures
  2. ensure that the work environment, material, tools and equipment are suitably prepared for the work activities to be undertaken
  3. obtain the required specification and use the correct information for marking out
  4. prepare suitable marking out surfaces and datum
  5. mark out using appropriate methods, tools and equipment
  6. check that marking out complies with the required specification
  7. reinstate the work area
  8. deal promptly and effectively with problems within your control and report those that have been and those that cannot be solved

Knowledge and Understanding

You need to know and understand:

1. relevant legislative, regulatory and local requirements or procedures and safe working practices 2. preparation and reinstatement requirements in respect of the work area, material, and equipment and the possible consequences of incorrect actions in these areas 3. relevant engineering drawings and related specifications 4. surface preparation requirements and methods 5. the tools, equipment, techniques and methods used for marking out 6. geometrical principles 7. tool and equipment control:  the correct use of relevant tools and equipment and your individual responsibility for the use, care and security of those you use


Work environment

**Typical work environments could include:

  • engineering construction sites
  • controlled operations
  • offshore installations
  • maintenance sites
  • nuclear sites
  • repair sites

Work environments may be open or restricted spaces: 

  • at height
  • confined spaces
  • control rooms
  • controlled operational and offshore installations
  • designated work areas
  • explosive atmospheres
  • existing plants and structures
  • fabrication workshops

  • in plant rooms

  • inside structures, system and plant
  • on access structures (scaffold)
  • on open structures

  • onshore and offshore installations

  • shafts
  • shipyards
  • tunnels

     Reinstate the work area

This term could include:

  • returning the work area to a safe condition
  • removing barriers
  • sweeping up
  • correctly disposing of waste materials
  • storing re-usable materials, consumables and equipment in accordance with appropriate procedures
  • completing all necessary documentation

Scope Performance

Scope Knowledge





Links To Other NOS

​Installing Plant & Systems  - Pipefitting

Fabricating Steel Structures - Plating

External Links

Version Number


Indicative Review Date

10 Dec 2024





Originating Organisation


Original URN


Relevant Occupations

Mechanical Fitter, Pipe Fitter, Pipefitter, Plater

SOC Code



Engineering drawings; conventions; geometrical; marking out; tolerances; preparation; mechanical fitting; pipefitting; installing plate; installing plant and systems; fabricating steel structures