Inst ToolsInst ToolsInst Tools
  • Courses
  • Automation
    • PLC
    • Control System
    • Safety System
    • Communication
    • Fire & Gas System
  • Instrumentation
    • Design
    • Pressure
    • Temperature
    • Flow
    • Level
    • Vibration
    • Analyzer
    • Control Valve
    • Switch
    • Calibration
    • Erection & Commissioning
  • Interview
    • Instrumentation
    • Electrical
    • Electronics
    • Practical
  • Q&A
    • Instrumentation
    • Control System
    • Electrical
    • Electronics
    • Analog Electronics
    • Digital Electronics
    • Power Electronics
    • Microprocessor
  • Request
Search
  • Books
  • Software
  • Projects
  • Process
  • Tools
  • Basics
  • Formula
  • Power Plant
  • Root Cause Analysis
  • Electrical Basics
  • Animation
  • Standards
  • 4-20 mA Course
  • Siemens PLC Course
Reading: Piping and Instrumentation Drawing (P&ID) Tutorials – Part 4
Share
Notification Show More
Font ResizerAa
Inst ToolsInst Tools
Font ResizerAa
  • Courses
  • Design
  • PLC
  • Interview
  • Control System
Search
  • Courses
  • Automation
    • PLC
    • Control System
    • Safety System
    • Communication
    • Fire & Gas System
  • Instrumentation
    • Design
    • Pressure
    • Temperature
    • Flow
    • Level
    • Vibration
    • Analyzer
    • Control Valve
    • Switch
    • Calibration
    • Erection & Commissioning
  • Interview
    • Instrumentation
    • Electrical
    • Electronics
    • Practical
  • Q&A
    • Instrumentation
    • Control System
    • Electrical
    • Electronics
    • Analog Electronics
    • Digital Electronics
    • Power Electronics
    • Microprocessor
  • Request
Follow US
All rights reserved. Reproduction in whole or in part without written permission is prohibited.
Inst Tools > Blog > Common > Piping and Instrumentation Drawing (P&ID) Tutorials – Part 4

Piping and Instrumentation Drawing (P&ID) Tutorials – Part 4

Last updated: January 21, 2020 12:13 pm
Editorial Staff
Common
No Comments
Share
4 Min Read
SHARE

Reading Engineering P&IDs

Standards and conventions have been developed to provide consistency from drawing to drawing. To accurately interpret a drawing, these standards and conventions must be understood.

Standards and Conventions for Valve Status

Before a diagram or print can be properly read and understood, the basic conventions used by P&IDs to denote valve positions and failure modes must be understood. The reader must be able to determine the valve position, know if this position is normal, know how the valve will fail, and in some cases know if the valve is normally locked in that position.

Figure 17 illustrates the symbols used to indicate valve status. Unless otherwise stated, P&IDs indicate valves in their “normal” position. This is usually interpreted as the normal or primary flowpath for the system. An exception is safety systems, which are normally shown in their standby or non-accident condition.

P & ID Valve Status Symbols

Figure 17 : Valve Status Symbols

3-way valves are sometimes drawn in the position that they will fail to instead of always being drawn in their “normal” position. This will either be defined as the standard by the system of drawings or noted in some manner on the individual drawings.

P&ID Document Reading Example

Example : At this point, all the symbols for valves and major components have been presented, as have the conventions for identifying the condition of a system.

Refer to Figure 18 as necessary to answer the following questions. The answers are provided in the back of this section so that you may judge your own knowledge level.

Example P&ID

Figure 18 : Exercise P&ID

1. Identify the following components by letter or number.

  • a. Centrifugal pump
  • b. Heat exchanger
  • c. Tank
  • d. Venturi
  • e. Rupture disc
  • f. Relief valve
  • g. Motor-operated valve
  • h. Air-operated valve
  • i. Throttle valve
  • j. Conductivity cell
  • k. Air line
  • l. Current-to-pneumatic converter
  • m. Check valve
  • n. A locked-closed valve
  • o. A closed valve
  • p. A locked-open valve
  • q. A solenoid valve

2. What is the controlling parameter for Valves 10 and 21?

3. Which valves would need to change position in order for Pump B to supply flow to only points G and H?

4. Which valves will fail open? Fail closed? Fail as is?

Answers :

1.

  • a. A or B
  • b. C or D
  • c. E
  • d. 31
  • e. 1
  • f. 8 or 17
  • g. 2,3,7 or 16
  • h. 10, 21
  • i. 12 or 24
  • j. 26
  • k. 32
  • l. 28
  • m. 5 or 14
  • n. 18 or 19
  • o. 18 or 19
  • p. 4
  • q. 11 or 23

2. Temperature as sensed by the temperature elements (TE)

3.

  • Open 18 and/or 19,
  • Shut 13 and 25

4.

  • Fail Open: 2 and 3
  • Fail Closed: 10 and 21
  • Fail as is: 7 and 16
Don't Miss Our Updates
Be the first to get exclusive content straight to your email.
We promise not to spam you. You can unsubscribe at any time.
Invalid email address
You've successfully subscribed !

Continue Reading

Common Materials used in Instrumentation Cables
How to Choose a Brass Cable Gland Manufacturer?
Top US Universities that Offer Online Education
What are Oil Burners? Types, Advantages, Applications
The Most Significant Developments in Satellite Technology
Batch Type Centrifugal Automation in Sugar Industries
Share This Article
Facebook Whatsapp Whatsapp LinkedIn Copy Link
Share
Leave a Comment

Leave a Reply Cancel reply

Your email address will not be published. Required fields are marked *

Stay Connected

128.3kFollowersLike
69.1kFollowersFollow
210kSubscribersSubscribe
38kFollowersFollow

Categories

Explore More

How to make RJ45 cable
Top 100 Microcontrollers Project Ideas
What is SOP and How to Create an SOP?
Pirani Gauge Working Principle
Slip Rings in Robotics – Types, Applications, Advantages
How to Test a Battery using a Multimeter?
Compressor Shutdown Job – Instrumentation Engineer Duties
Maintenance – Preventive, Predictive, Proactive, Corrective

Keep Learning

Auto Cane Feed Control System using DCS

Auto Cane Feed Control System using DCS – Sugar Factory

PCB Making Machine

Beyond FR-4: Exploring Novel Materials for PCB Fabrication

CNC Machine Tools Problems and Solutions

Common Problems With CNC Machine Tools & Their Solutions

The Best HVAC System for Home

Which HVAC System is Best for Home?

Aluminum CNC Machining Complete Guide

Aluminum CNC Machining: A Complete Guide You Cannot Miss

Condensate Automation in the Sugar Industry

Condensate Automation in the Sugar Industry

Top 20 Service Business Opportunities in the Instrumentation Industry

Top 20 Instrumentation Service Business Opportunities in the Industry

Pneumatic Counter for Counting the Strokes of a Cylinder

Pneumatic Counter for Counting the Strokes of a Cylinder

Learn More

Why we use Cable Shielding with Ferrites ?

Why we use Cable Shielding with Ferrites ?

how-to-select-a-fuse

How to Select a Fuse ?

Failsafe interlock Design

Failsafe Wiring Practices

MicroElectronics and Integrated Circuits Objective Questions and Answers

MicroElectronics and Integrated Circuits Objective Questions and Answers

RC snubber circuits

How Snubber Circuit works ?

Wedge Flow Meter

Wedge Flow Meter Principle

Digital Control Systems

The Z-Transform

Pull-up switch circuit.

Pull Up and Pull Down Switch Circuits

Menu

  • About
  • Privacy Policy
  • Copyright

Quick Links

  • Learn PLC
  • Helping Hand
  • Part Time Job

YouTube Subscribe

Follow US
All rights reserved. Reproduction in whole or in part without written permission is prohibited.
Welcome Back!

Sign in to your account

Username or Email Address
Password

Lost your password?