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Red, Green & Black methodology

Drawing modification for retrofit or partial modification applications. Acrastyle can provide specially marked versions of the various old and new scheme drawings called ‘red, green and black’. These make life simpler for the installation and commissioning engineers on site, as they clearly identify what each part of the drawing is.

Red, Green & Black methodology

The different colours represent the following:

  • Existing wiring and components which are not affected by the modification and which must remain (coloured black)
  • New wiring and components which are being added (coloured red)
  • Old wiring and components which need to be removed (coloured green

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Multi-phased Planning

If the modification work is going to be carried out in stages to meet operational demands, then drawings will be required in several phases.

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