Mapping the installation takes place during the review and is carried out through a P&ID Walkdown. This is a process where a team of technical experts and operators visits the actual production plant. During this visit, the information on a P&ID is compared to the actual equipment, pipelines, instrumentation, and valves present in the field. The goal of the P&ID Walkdown is to identify and correct any discrepancies or inconsistencies between the drawing and the actual installation.

During the P&ID Walkdown, we go through several steps:

• Gathering Information
  The team collects all relevant information about the process, including the P&ID, work instructions, and equipment specifications.

• Visiting the Installation
  The team visits the process plant to observe and compare the actual equipment, pipelines, instrumentation, and valves with the P&ID.

• Equipment Verification
  The team checks whether the equipment on the P&ID matches the actual equipment in the field. They verify dimensions, materials, and specifications for accuracy and any differences.

• Pipeline Verification
  The team checks whether the pipelines on the P&ID match the actual pipelines in the field. They ensure that the size, materials, and routing of the pipelines are correct. They also check whether there are any differences.

• Instrumentation and Valve Verification
  The team checks whether the instrumentation and valves on the P&ID match the actual instrumentation and valves in the field. They check specifications, positions, functions, and note any differences.
• Correcting Discrepancies
  If discrepancies or inconsistencies are found, the team corrects them by making changes to the P&ID or by adjusting the actual equipment, pipelines, instrumentation, or valves.

A P&ID Walkdown is an essential part of the functioning and maintenance of production plants. Besides, it also ensures that the installation operates safely and efficiently.