Mechanical Measurement and Instrumentation MECN 4600 Department of Mechanical Engineering Inter American University of Puerto Rico Bayamon Campus Dr. Omar E. Meza Castillo omeza@bayamon.inter.edu http://www.bc.inter.edu/facultad/omeza

Tentative Lecture Schedule Topic Lecture Basic Principles of Measurements Response of Measuring Systems, System Dynamics Error & Uncertainty Analysis 1, 2 and 3 P&ID 4 Least-Squares Regression 5 Measurement of Pressure 6 Measurement of Temperature 7 Measurement of Fluid Flow 8 Measurement of Level 9 Measurement of Stress-Strain 10 Measurement of Time Constant 11

Piping and Instrumentation Diagram Topic 4: P&ID Piping and Instrumentation Diagram

To use P&ID in order to read engineering plans. Course Objectives To use P&ID in order to read engineering plans.

P&ID Piping and Instrumentation Diagram A Piping and Instrumentation Diagram - P&ID, is a schematic illustration of functional relationship of piping, instrumentation and system equipment components. The P&ID are used to operate the process system. The P&ID shows the flows in a plant (in the chemical or process industry) and the corresponding sensors or actors. At the same time, the P&ID gives a name ("tag") to each sensor and actor, along with additional parameters. This tag identifies a "point" not only on the screens and controllers, but also on the objects in the field. Many standards: ISA, DIN, etc

P&ID Piping and Instrumentation Diagram A P&ID should include: All process equipment identified by equipment number All pipes identified by a line number. Pipe size and material of construction should be shown (material may include as a part of the identification number) All valves with an identification number along with their type & size should be shown Ancillary fittings that are part of piping system such as inline sight glasses, strainers and stream traps with an identification number. Pumps identified by a suitable code number. All control loops and instruments with identification

P&ID Example

P&ID is equal that PFD Process Flow Diagram (PFD) is a schematic illustration of the system. shows the relationships between the major components in the system. 

Instrument Identification

P&ID

Instrumentation Identification

P&ID and Symbols Sets of symbols are used to depict mechanical equipment, piping, piping components, valves, equipment drivers and instrumentation and controls. These symbols are assembled on the drawing in a manner that clearly defines the process. The instrumentation and control (I&C) symbols used in P&IDs are generally based on ISA-5.1, Instrumentation Symbols and Identification. The first letter of any tag name, therefore, will indicate the process variable being measured. The most common process variables in a process plant include: F – Flow L – Level P – Pressure T – Temperature

P&ID and Symbols Typical Letter Combinations, a reprint of a page in ISA-5.16, shows many possible letter combinations and describes the device represented by the letters. Reading across Figure 2-10 (page 30 of pdf file P&ID and symbols), starting with an F, the initiating or measured variable for flow rate, the succeeding letters describe the devices and functions as follows: : Letter Combination Description FRC Flow Recorder Controller. A recorder for the value of instantaneous flow, integral with a flow controller. FIC Flow Indicating Controller. An instantaneous flow indicator combined with a flow controller.

General Instrument or Function Symbols

Instrument Line Symbols

Due, Tuesday, February 05, 2013 Homework2  WebPage Omar E. Meza Castillo Ph.D.