Instrument Location Layout

What is instrument location layout?

The arrangement of an instrument in a process area is known as an “Instrument location layout.” This diagram displays each instrument’s precise location with respect to the plant layout.

Detailed Explanation of Instrument Location Layout

Instrument location layout is also referred to as an “Instrument location plan.” Instrument location layout refers to the arrangement of instruments and controls within a process control system.

It is a visual representation of the physical layout of the instrumentation and control devices in a facility, such as a power plant or chemical processing plant.

What are the details in the instrument location layout?

  • The physical location of each instrument and control device within the facility, including the room or area in which it is located.
  • The point indicating the position of the instrument and its mounting stand, as well as the process tap location.
  • Elevation data for the instrument (including its mounting stand) and the process tap.
  • The type of instrument or control device, such as a temperature sensor or control valve.
  • The process variable being measured or controlled by the instrument, such as pressure, flow rate, or temperature.
  • The range or setpoint of the instrument, if applicable.
  • The identification number or tag of the instrument, which is used for identifying and tracking the instrument.
  • The manufacturer and model number of the instrument.
  • The control system or process to which the instrument is connected.
  • Location of the junction box, including its elevation.
  • Location of the Instrument Air Manifold and its elevation
  • Any special instructions or notes related to the instrument or its use.

What are the reference documents for instrument layout preparation?

The following reference drawings are required for creating the instrument location layout:

  1. P&ID document
  2. Piping plan
  3. Isometric piping
  4. Instrumentation and Control drawings
  5. Process Control Narratives
  6. Instrument Specification Sheets
  7. Instrument Installations drawings
  8. Instrument Loop diagrams
  1. Process and instrumentation diagrams (P&IDs): These diagrams provide a graphical representation of the process flow and the instrumentation and control devices used to monitor and control the process. P&IDs are often used as the basis for the instrument location layout.
  2. Piping Plan:  To prepare an instrument layout, the designer must gather a piping plan to serve as a foundation.
  3. Isometric Piping: Refer to the piping isometric to confirm the tapping point’s location. The instrument shall be positioned on an instrument stand as close as practicable to the tapping point or as necessary by the operator to facilitate maintenance and reading.
  4. Instrumentation and control drawings: These drawings provide detailed information about the location, type, and function of each instrument and control device in the system.
  5. Process control narratives: These documents describe the control strategy for the process, including the control loops and the functions of the various instruments and control devices.
  6. Instrument specification sheets: These sheets provide detailed information about the performance and technical specifications of each instrument in the system.
  7. Instrument installation drawings: These drawings provide information about the physical installation of the instruments, including the locations of conduit and cables, and the mounting details for each instrument.
  8. Instrument loop diagrams: These diagrams provide a graphical representation of the control loops in the system, including the inputs and outputs of each instrument and control device.

What is the purpose of instrument location layout?

The purpose of an instrument location layout is to provide a visual representation of the physical layout of the instrumentation and control devices in a facility. It is used to help design and install the control system, as well as to troubleshoot and maintain the system.

The instrument location layout serves several key functions:

  1. It provides a map of the control system, allowing engineers and technicians to quickly locate and identify individual instruments and control devices.
  2. It helps to ensure that the control system is properly designed and installed, by providing a clear and accurate representation of the locations and functions of the various instruments and control devices.
  3. It aids in the maintenance and troubleshooting of the control system, by providing a clear overview of the various components and their interconnections.
  4. It serves as a reference for ongoing operations and maintenance of the control system, providing a clear and detailed record of the instrumentation and control devices in the system.

The following is an example of the instrument location layout.

Instrument location layout 1
Instrument location layout 2

Sundareswaran Iyalunaidu

With over 24 years of dedicated experience, I am a seasoned professional specializing in the commissioning, maintenance, and installation of Electrical, Instrumentation and Control systems. My expertise extends across a spectrum of industries, including Power stations, Oil and Gas, Aluminium, Utilities, Steel and Continuous process industries. Tweet me @sundareshinfohe

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