Car Seal

Car seal, abbreviated as CS, is specified on instrument bubbles on Piping and Instrumentation Diagram.  A car seal is a type of tamper evident seal used in industrial settings to secure various types of equipment, including valves, meters, or other instruments.  These seals are commonly used in industries such as oil and gas, chemical, and manufacturing to ensure the integrity and security of critical processes and equipment.

Here's How Car Seals for Instrumentation Generally are Used

Tamper Evident Design  -  Car seals are designed to be tamper-evident, meaning that once they are applied, any attempt to remove or break the seal will leave visible evidence of tampering.
Application  -  They are often made of durable materials such as metal or plastic and have a design that makes them difficult to remove without leaving a mark.  Car seals are typically applied to secure valves or other control devices in a fixed position.
Serial Numbers or Unique Identifiers  -  Many car seals have unique serial numbers or other identifiers that can be recorded for tracking purposes.  This helps in monitoring and identifying when a seal has been broken or tampered with.
Regulatory Compliance  -  In some industries, the use of tamper-evident seals is a regulatory requirement to ensure the safety and security of processes.  For example, in the oil and gas industry, car seals may be used to secure valves in pipelines to prevent unauthorized access or tampering.

The use of car seals for instrumentation is part of a broader strategy to maintain the integrity of industrial processes, prevent unauthorized access, and comply with safety and regulatory standards.

Car Seal Open

Abbreviated as CSO, on P&ID and PFD diagrams.

Car Seal Closed

Abbreviated as CSC, on P&ID and PFD diagrams.