SAP
Tarit Mahata
Instrumentation Engineer
Paradip
Summary
A seasoned Instrumentation professional with over a decade of progressive experience at Indian Oil Corporation Limited. Specializing in the design, implementation, maintenance, and project management of advanced control systems, safety instrumented systems, and critical plant instrumentation across diverse refinery units. Proven ability to enhance operational reliability, lead complex upgrade projects, and drive efficiency through strategic planning and in-house engineering. Adept at system modernization, reliability improvement, and leading cross-functional teams to achieve operational excellence.
Overview
12
12
years of professional experience
4
4
years of post-secondary education
3
3
Languages
Work History
Instrumentation Manager
Indian Oil Corporation Limited
Paradip
07.2021 - Current
- Leads instrumentation for VGO-HDT, DHDT, HCDS units, NHT-CCR, and critical BS-VI project jobs.
- Core group member for the commissioning of DHDT BS-VI revamp, HCDS capacity revamp, ROG PSA units, and KHDS units, including interlock build and implementation in ESD systems based on vendor cause and effects diagrams and licensor requirements.
- Initiated a special drive to enhance machine protection instrumentation reliability, focusing on identification and removal of Single Point Failures (SPF) as per API 670 for critical rotating equipment (VGO-HDT RGC, DHDT RGC, VGO-HDT Feed pumps, DHDT Feed pumps), and other process signals contributing to plant interruptions.
- Active member in various Root Cause Analyses (RCA) for plant interruptions/failures, providing actionable recommendations to prevent recurrence and facilitate horizontal deployment across units.
- Led the creation of Standard Maintenance Practices (SMPs) for critical instruments/systems, including daily monitoring of Bentley 3500 systems, online 3500 MMS system cards/power supply replacements, vibration signal checking, and card/PSU replacement of critical DCS and ESD systems.
- Directed the creation of Preventive Maintenance (PM) schedules for critical control valves, shutdown valves, and ROG PSA valves.
- Gained extensive experience with Honeywell Experion PKS SCADA, Honeywell C300 DCS, Honeywell Safety Manager PLC, Yokogawa Prosafe PLC system, and Linde PSA with Siemens S-700 PLC through both maintenance jobs and project commissioning activities.
Instrumentation Planning (Assistant Manager)
Indian Oil Corporation Limited
07.2019 - 06.2021
- Primarily responsible for Instrumentation Planning, leading various Additional Facility projects from concept to execution.
- Managed key projects including Flare Load Mitigation, New Access Control System, IP-based Plant and Periphery CCTV Systems, RLNG Facility for various units (CPP, Gas Turbine, HGU, CDU, VDU), and Redundant Tank Gauging for approximately 130 tanks in the O&M Tank Farm.
- Spearheaded in-house engineering for Flare Load Mitigation and RLNG Projects, encompassing P&ID preparation and review, HAZOP review, cause and effect review, instrument index creation, finalization of Instrumentation I/O lists, hardware allocation in existing DCS/PLC, preparation of specifications for field instruments, and vendor/contractor coordination.
- Involved in P&ID review and 3D model review for the DHDT unit under the BS-VI project.
Assistant Manager (Instrumentation)
Indian Oil Corporation Limited
07.2017 - 06.2021
- Assumed primary responsibility for Instrumentation in RFCC, VDU-II, MSQ, DHDS, and three SRU units, alongside continued oversight of CPP.
- Acquired hands-on experience with Honeywell HPM system, Bentley 3500 Systems, and Condition Monitoring System ‘System-1 Classic’ (predecessor to System-1 evo), complementing existing expertise in Yokogawa Centum VP DCS and Triconex Safety PLC.
- Led critical reliability improvement jobs for RFCC MAB and WGC, converting old switch-based interlocks to analogue transmitter-based logic with extensive 2-out-of-3 (2-O-O-3) implementation in Triconex PLC. All engineering, including Process I/O and MMS tag allocation, was executed in-house.
- Upgraded Bentley 3300 MMS racks to 3500 racks for both MAB and WGC.
- Directly executed Triconex PLC upgrades (MP 3006 and MP 3009), including firmware replacement for I/O cards and communication modules across RFCC, MSQ, DHDS, Old HGU, SRU-II & III.
- Executed front-end upgrades for DHDS, Old HGU, SRU-II & SRU-III units.
- Served as a core group team member for the VDU-II revamp and MSQ BS-VI Revamp projects.
- Directly involved in the revival of old HGU units to meet H2 demand post-BS-VI scenario.
- Successfully revived old defunct stack analysers (SO2, NOx, CO, PM, O2) and various process analysers (Sulphur analyser in DHDS, MSQ, MS-Blend FT-NIR analyser, Reformer outlet, and PSA outlet analysers) to meet post-BS-VI requirements.
Instrumentation Engineer
Indian Oil Corporation Limited
07.2013 - 06.2017
- Managed instrumentation for critical units including CPP, Power Plant, Cooling Tower, Fuel Transfer facility, Tankages for CPP, Hydrocracker (HGU), and Nitrogen Generation Plant.
- Gained foundational experience with Yokogawa Centum VP DCS, Triconex Safety PLC, and GE Mark VI and Mark VI-e System for Gas Turbine Control.
- Directly involved in and executed the upgrade project of Centum CS-3000 to Centum VP for HRSG.
- Successfully managed the Mark V to Mark VI-e replacement for Gas Turbine #1, including comprehensive scope preparation, Factory Acceptance Testing (FAT), and Site Acceptance Testing (SAT).
- Executed the upgrade of Mark VI controllers to Mark VI-e for Gas Turbines #2 and #3, retaining existing Mark VI I/O modules to achieve a unified platform across all three GTs and mitigate product notifications against Mark VI UCV controllers and VCMI VME interface cards.
Education
BE - Instrumentation and Electronics Engineering
Jadavpur University
Kolkata, West Bengal 05.2009 - 05.2013
Skills
Yokogawa Centum VP DCS
Yokogawa Centum CS-3000
Honeywell Experion PKS SCADA
Honeywell C300 DCS
Honeywell HPM
Triconex PLC
Honeywell Safety Manager PLC
Yokogawa Prosafe PLC system
Siemens S-700 PLCs
GE Mark VI-e System
Mark VI
Bentley 3500 System
System-1 EVO
Scope Definition
FAT/SAT
Commissioning
Project Execution
Vendor & Contractor Management
P&ID Preparation & Review
HAZOP Participation
Instrument Index Creation
I/O List Finalization
Hardware Allocation
Cause & Effect Review
Root Cause Analysis (RCA)
Single Point Failure (SPF) Identification & Mitigation (API 670)
Standard Maintenance Practices (SMP) Development
Preventive Maintenance (PM) Scheduling
SO2/NOX/CO/PM Analyzer
Furnace O2 Analyzer
Sulphur Analyzer
FT-NIR Analyzer
HGU outlet Analyzers
IP-based CCTV Systems
Access Control Systems
Redundant Tank Gauging
Instrument Calibration
Software
Interests
Project jobs, Scheme implementation, retro-fit jobs
Timeline
Instrumentation Manager
Indian Oil Corporation Limited
07.2021 - Current
Instrumentation Planning (Assistant Manager)
Indian Oil Corporation Limited
07.2019 - 06.2021
Assistant Manager (Instrumentation)
Indian Oil Corporation Limited
07.2017 - 06.2021
Instrumentation Engineer
Indian Oil Corporation Limited
07.2013 - 06.2017
BE - Instrumentation and Electronics Engineering
Jadavpur University
05.2009 - 05.2013