Role of an Instrumentation Design Engineer for Beginners

, Role of an Instrumentation Design Engineer for Beginners
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An Industrial plant facility typically executed in mainly three domains: Engineering, Procurement, and Construction. Once construction is completed then it is commissioned with respect to design (Engineering) requirement.

After the commissioning phase plant is handed over to the Operation and maintenance team for further production and related maintenance.

Engineering of any plant deals with lot of documents, specifications, drawings, calculation, special studies, reports, and modelling work etc.

Procurement deals with floating RFQ (request for quotation) for material and services, getting offers from vendors, aligning commercial & logistic aspects and issuing purchase orders etc

Construction deals with installation / erection of all items purchased by procurement as per drawings and in accordance with documents produced by Engineering.

Table of contents

Engineering of industrial facility involves close coordination between various disciplines like Process, safety, piping, civil, mechanical, electrical and instrumentation, etc.

Instrumentation Design Engineer

For detailed Control and Instrumentation Engineering, one should understand list of deliverables, its purpose, and contents inside document or drawing.

For any typical project following are drawings/documents generated by the instrument Engineer.

A Control and instrument (C&I) engineer performs field instrument engineering, control system engineering, installation engineering, and package engineering.

Field Instrument Engineering

  • General specification of Instrumentation / Design Basis
  • Instrument Index
  • Datasheet of Valves, Instruments (Pressure, temperature, flow, level, Analyser, Fire and Gas devices, etc
  • Selection/ sizing calculation for control valves, flow elements/ meters, thermowell, DP Level calculation, Pressure safety valve,
  • Level Sketch drawing
  • Voltage drop calculations
  • SPI / AVEVA / COMOS database setup

Control System Engineering

  • Specification of Control and Safety systems
  • I/O List including alarm and trip summary
  • Serial interface database
  • System Architecture drawings
  • Functional schematic, Graphics
  • Logic Diagram / write-up
  • Trend, Control group
  • Auxiliary/ Hardwired console layout
  • Interface with Electrical
  • Intrinsically safe calculation
  • UPS Load list / requirements
  • SIL verification calculation
  • FF Segment Validation

Installation Engineering

  • Standard installation drawing
  • Hook up diagram
  • Instrument Air Supply and distribution layout
  • Main cable tray/ trench/ duct routing drawing, Cable Tray sizing, Junction box grouping
  • Fire and Gas detector layout
  • Control room Building layouts
  • Cable block diagram / Instrument Cable Schedule and Termination details,
  • Instrument Loop drawing/wiring drawing
  • Instrument location / Junction box location drawings
  • MTO for installation materials
  • 3D modelling review

Package Engineering

  • Specification of MMS, HIPPS, BMS, WHCP, Packaged control system, etc
  • Interface with Field instrument engineering, Control system Engineering and installation engineering.

MMS: Machine Monitoring system,

HIPPS: High integrity pressure protection system,

BMS: Burner management system,

WHCP: Wellhead control panel

For each deliverable an Instrument engineer must closely coordinate with other discipline either for seeking input or providing output.

Project success lies in timely and correctly co-ordinating with other disciplines.

Control Valve Selection during Design Phase

Following is a typical example for Control valve interfaces for various input and output with multiple disciplines, but not limited to.

Activity Interface Purpose
Control Valve Process data From Process Team Process data/process datasheet for control valve to instrument Team by process team (which includes flowrate, diff pressure, temperature, density, etc)

A special requirement such as Max flow limitation, the applicability of fire zone, etc to be indicated by the process team

Sizing calculation By Instrument Team Instrument team performs the sizing calculation by tools like Conval and/ Instrument datasheet with indicative Cv is sent to vendors for their offer.

In case of cavitation/flashing, process data should be cross-checked with the process team for further selection

Material Specification From Piping Team Valve material specification / Piping material specification are referred for Control valve body material, Trim material, flange rating,  etc requirements
Selection By Instrument Team Based on valve sizing and vendor offer; valve type and size are indicated by the instrument team on P&ID.

Special attention for severe service like high temperature, cryogenic service, Large size valves, Governing valves etc

P&ID Interface To Process Team Legend mark up to process team to be provided in case of additional accessories like Partial stroke testing or MOV related signals. Valve Typical to be modified if required.
Utility requirement To Process Team Instrument Air required for control valve is given to process team for IA compressor / receiver sizing      
Utility requirement To Electrical Team In case of Electrical actuator, power requirement is given to electrical team for feeder and ACDB sizing
Face-Face dimension To Piping Team Face-to-face dimension, valve size, rating, facing of control valve to be given to Piping team to incorporate in 3D models
General arrangement drawing To piping team 1. GAD of control valves to be given to the piping team to reserve the space for accessibility and maintenance.

The instrument team shall ensure accessories orientation and location for ease of maintenance.

2. Fire-proofing jacket dimensions, in case valve is in fire zone

Nozzle interface for utility To Piping Team In case, steam jacketed control valve interface should be done with piping for nozzle orientation for inlet and outlet nozzles.
Special Case To piping team, Civil team, process team and electrical team In the case of hydraulic actuators, interface with the piping team, civil team, process team, and the electrical team is done for Hydraulic tank, pumps, oil tubing/piping up to actuator, Panels, etc

(e.g. Steam Governing Control valves, although vendor engineered item but interface required when you receive documents.)

Typical Example

Below is a typical example showing how international codes & standards and local regulations are considered for Control Valve during the design or engineering phase.

, Role of an Instrumentation Design Engineer for Beginners

Engineering Team Activities

Activities done by Engineering team during procurement phase

  • Material requisition to approved vendor list
  • Evaluation of offer submitted by vendors
  • Technical queries to vendors
  • Technical bid analysis
  • Purchase requisition
  • Vendor drawing review
  • Review of client/ PMC comment on Engineering and/vendor documents
  • Prepare Comment resolution sheets
  • Inspection
  • Change order if any, PO amendments inputs

Instrumentation Design Softwares

Software used in instrument calculation/layouts/modeling but not limited to following

  • 3D modelling software – Plant Design System (PDS – 3D) / Smart plant 3D (SP – 3D), Plant design management system (PDMS)
  • 3D review Software –  Smart plant reviewer/ Naviswork Freedom
  • 2D CAD Software – Microstation / AutoCAD
  • Instrument Database – Smart Plant instrumentation – SPI (Intools) / AVEVA / COMOS
  • Instrument Sizing – SPI / Flowel / Conval / InstruCal, PRV2Size, Instrument Toolkit®
  • SIL Study – ExSILentia, SIFPRO, SIL Comp
  • In-house developed tools like voltage drop calculation, IS calculation etc are also used.

Special Studies during Design Stage

Special Studies performed during Engineering in which C&I Engineer participation is needed (these are multi-disciplinary studies), but not limited to following

Studies performed during Engineering by Control system vendor along with C&I engineer, but not limited to following

  • Hardware Freeze
  • Software Freeze
  • Automation Architecture and network philosophy

Challenges during Engineering

  • Lack of co-ordination across the disciplines and Ignorance
  • Improper/insufficient specification / requirement from client / owner
  • Tight schedule, difficult project location / weather condition
  • Lack of knowledge and/ lack of awareness on Codes and standards

Tips for those who want to make a career in Design Engineering

  • Never stop learning
  • Try to figure out input and outputs for each deliverable
  • Learn and practice codes and standard
  • Figure out details mentioned in each document and question why?
  • Start with small activities
  • Understand the process first then think about the instrument
  • Never assume something (e.g. You just can’t select 3” Control valve in 8” line. Know your input and question them)
  • Document everything in detail
  • Share your knowledge. Be it maintenance or operation issue or Root cause analysis
  • Read technical articles, processes, and trends
  • Seek Guidance from Seniors, mentors, industry specialist
  • It is not rocket science. However, you must know the impact of wrong selection / wrong design, etc (e.g. How can you imagine 2 barg range of pressure gauge in the line where pressure is 20 barg?)
  • Don’t hide your mistakes. Just correct it before it is too late.

Engineering Design Job Profile Workload

Design jobs are mostly office jobs, you must love documents, computer screen.

Sometimes you are also involved in Factory acceptance test or inspections at vendor’s workshop.

Control and Instrumentation (C&I) Engineer also needs to support/answer site queries.

Design engineers are sent to the site for close co-ordination with construction and commissioning teams.

As the production drives the commissioning, Commissioning drives the Construction, Construction drives the Procurement, and procurement drives the Engineering, your focus must be first time right, on time, with consistency and quality.

Any delay in Engineering results in an overall schedule delay. In case of ambiguity, delay, bottlenecks raise the hand.

Better value engineering results in cost-saving for the project.

ISA Instrumentation Books

Books to read (ISA), but not limited to below

1. Instrumentation and Control Systems Documentation

2. A Guide to the Automation Body of Knowledge

3. Electrical Instruments in Hazardous Locations

4. Control valve Primer

5. Industrial Flow Measurement

6. Applying FOUNDATION Fieldbus

7. Alarm Management: Seven Effective Methods for Optimum Performance

8. Safety Instrumented Systems: Design, Analysis, and Justification

9. Industrial Network security

10. Advanced PID Control

Do you know any other good books? Share with us through the below comments section.

This article does not show all the activities performed by C&I engineer during design phase, also does not indicate how to do that.

The aim of this article is to show the role of C&I engineering during the design phase to the extent possible.

Users are advised to do engineering activities under supervision. Get used to codes/standards and best engineering practices.

Exercise for you

Please share your answer in comment box

1. Suppose because of the HAZOP study outcome, one pressure transmitter is added. Which are documents you revise?

2. Suppose you are doing junction box grouping, if you found that one transmitter is wrongly assigned to that JB. Which are documents you revise for correction?

3. If you receive input for a process that where line pressure is revised from 20 barg to 50 barg, what is the impact on instrumentation if that line has a flow meter, control valve, pressure transmitter, and safety valve?

Author: Jatin Katrodiya

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