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: Root Cause Analysis for Plant Trip Due to Work on Incorrect Tag
Share
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 > Root Cause Analysis (RCA) > Root Cause Analysis for Plant Trip Due to Work on Incorrect Tag

Root Cause Analysis for Plant Trip Due to Work on Incorrect Tag

We will discuss about the root cause analysis of an incident in which one unit of a plant tripped due to work on an incorrect tag.

Last updated: November 2, 2022 12:46 pm
Editorial Staff
Root Cause Analysis (RCA)
1 Comment
Share
4 Min Read
SHARE

Today in this article we will discuss about the root cause analysis of an incident in which one unit of a plant tripped due to work on an incorrect tag.

The incident we are going to discuss can occur in any plant if a technician or working personnel does not pay proper attention to the job.

Plant Trip Due to Work on Incorrect Tag

Root Cause Analysis for Plant Trip Due to Work on Incorrect Tag

One of the units in the crude plant of a refinery had an issue with a pressure transmitter. The pressure transmitter was single-line equipment and was having issues with fluctuations.

So, maintenance activity for the pressure transmitter was planned. On the low-low pressure alarm of the pressure transmitter, a pump was having an interlock.

The pump will trip on the low-low pressure alarm. A total of three pumps were installed in the same area for the same purpose.

All the transmitters of these 3 pumps were installed in a single skid together. During the activity on the pressure transmitter of pump A, pump B tripped.  

So, what can be the reason for the tripping of pump B?

The technician verified the pressure transmitter on which the job was to be done. The tag number of the pressure transmitter (PT-A) matched with the tag number mentioned on the permit (PT-A).

As soon as the technician isolated the pressure transmitter from the manifold, the pressure of pump B went to 0.5 kg/cm2 on the graphics.

At the same time, pump B tripped. Hence, work on the incorrect tag was clear.

But when the Engineers went to see the pressure transmitter, the tag on which the technician was working was correct.

So further checking was planned. The impulse tube of the pressure transmitter was traced. On tracing the impulse tube, it was observed that the pressure transmitter was connected to pump B.

Also, the pressure transmitter of pump A was traced. It was observed that the pressure transmitter connected to pump A was different. The tag number of the pressure transmitter connected to pump A was PT-B.

Definitely, the tripping of pump B was due to incorrect tagging.

The tag painting was incorrect due to which the tripping of pump B occurred.

So how can we avoid such problems?

  1. Usually, the cables of every transmitter have an aluminum tagging. In this case, the aluminum tag plate was missing.
  2. Also, the display of some transmitters can be configured to show the tag number also. In this case, the tag number on display was left blank.
  3. One more thing to avoid such problems is that when we go for doing the job on any transmitter, always confirm the value with the panel engineer. The value in the field should match with the value on the graphics. This step will eliminate the work on the incorrect tag.
  4. Here for all 3 pumps, a common skid for mounting transmitters was given. So, during the commissioning phase, try to separate a group of transmitters for dedicated equipment.

If you liked this article, then please subscribe to our YouTube Channel for Electrical, Electronics, Instrumentation, PLC, and SCADA video tutorials.

You can also follow us on Facebook and Twitter to receive daily updates.

Read Next:

  • Vibration Probe Analysis
  • The compressor Did Not Trip
  • Root Cause Analysis of Valve
  • Heat Exchanger Tubes Corroded
  • Pump Trip Root Cause Analysis
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

Miscellaneous Electrical Tasks – Repaired Reformer Tubes Weld Stress Relief
Primary Reformer RFG main Hot Spots threaten Indefinite Outage
Fasteners and General Corrosion of Electrical Motors
Reformer Fan Bearing Change Times cut by 90%
Doubtful Temperature Readings threatens Soaking Pit Wrecks 
Replace Failed Motors Quickly and Easily
Share This Article
Facebook Whatsapp Whatsapp LinkedIn Copy Link
Share
1 Comment
  • Abduslam sultan says:
    November 3, 2022 at 2:50 pm

    Good Day,
    i am following the issued technical topics which have very good issues i am now little bit busy but in coming future i will try to write some good
    thinks a lot for your great effort

    Reply

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

Turbo-Compressor Problem – Root Cause Analysis
Target Flow Transmitters Failed the Very Midnight
[RCA] Pump Low throughput Eliminated
Under and Over-Capacity Control Valve Pose Poor Controllability
Butterfly Valve Failure Caused Serious vicinity Heavy Fire
Malfunctioning Inlet Check Valves caused chaos at Compressor stop/trip
Finned Tube Steam Leaks – Root Cause Analysis
Poor Power Factor Boosted – Industrial Electrical Problems

Keep Learning

Tilting Pad Bearing

8000 RPM 8000 kW Turbine Problem

Pipe Elbow Sudden Burst

A Pipe Elbow Sudden Burst Fatalities and Wrecked Panel Instrumentation

repairs of welding cast refractory lined box over the hot spots

Too often done riskily repaired Roof Hot Spots eliminated forever

Pulverizer Electrical Problem Solved

Pulverizer Electrical Problem Solved

Poorly Built Switchgears

Poorly Built Switchgears – Why Breaker Parts Tear apart or don’t work?

Fired Boiler Induced Draft Fan (IDF) Failures

Fired Boiler Induced Draft Fan (IDF) Failures Upset all Plants Operations

Flash Vessel All Level Instruments Stopped Working

Ammonia Flash Vessel All Level Instruments Stopped Working

HT Motor Direction of Rotation (DOR)

HT Motor Direction of Rotation (DOR) Changed

Learn More

Heat Recovery in HVAC System

Heat Recovery in HVAC System

Emergency Shutdown System Philosophy

Shutdown Philosophy

Vibration Probe Field Setting Procedure

Vibration Probe Field Setting Procedure

Transistor Stabilisation

Transistor Stabilisation

DeMorgan's Theorems

DeMorgan’s Theorems using Ladder Diagram

Fieldbus Wiring

Fieldbus vs 4-20mA

Power Electronics Objective Questions

Thyristor Rating Objective Questions and Answers

Loop Diagram

15 Loop Diagram Questions

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?