Physical Size and Mechanical Design Information The physical size and mechanical design information almost universally found on P&IDs for all major processing and production facilities…

Toxic and combustible materials require special attention. Facilities handling hydrogen sulfide (H2S) require an ambient H2S monitoring system. Monitoring stations should be judiciously located around…

• Shutdowns and interlocks. Automatic shutdown and interlock systems (see Section 1200) prevent the startup of equipment or portions of the plant when operation would…

Local level indication should be provided for all columns, vessels and drums to determine total and interface (if any) level. • Gage glasses. Gage glasses…

Local temperature indication should be provided for process equipment and piping where required for manual field control. Such temperature indicators should measure outlet water temperature…

Remote temperature indication should be provided, as follows, on most process equipment and piping: • Columns. All inlet and outlet lines • Vessels. All inlet…

Pressure gages should be installed on the following process equipment and piping locations to monitor operation and performance: • Discharges of pumps and compressors •…

Process Control Schemes Process flow and control diagrams generally do not show equipment controls, safety controls, and miscellaneous minor instruments. When incorporating process controls on…

The following should be agreed upon before much work is done on the P&IDs for a project: • A standard for continuous modulating controls •…

Main P&IDs The main P&IDs show process flow, mechanical equipment, and instruments and controls. For small plants the main P&ID is all that is required.…