Senior Design Engineer - Instrumentation & Control

Larsen & Toubro (L&T); Chennai District; On-site; INR 600,000 - 1,200,000; Full time

Job summary

Larsen & Toubro (L&T) in Chennai, India, is seeking instrumentation engineers to support design and integration of process control systems across packages and skids. You will prepare P&ID drawings, datasheets, I/O lists and wiring diagrams.

The role involves sizing control and safety valves, performing flow element calculations, and reviewing vendor documents, FAT/SAT procedures, and 3D instrumentation models.

Qualifications

• Knowledge of process instrumentation design and piping disciplines.
• Experience in preparing instrument datasheets, I/O lists, and schedules.
• Ability to review vendor documents and FAT/SAT procedures.
• Familiar with PLC architecture, wiring diagrams, and HMI/SCADA graphics.
• Exposure to 3D model reviews for instrumentation layouts.

Responsibilities

• Prepare and review P&ID diagrams and instrument datasheets.
• Create and verify I/O lists, cable schedules, and junction box layouts.
• Size control and safety valves, perform flow element calculations.
• Coordinate with Electrical, Mechanical, Process, and Civil teams.
• Review QA documents and participate in vendor document reviews.
• Assist in 3D model instrument layout reviews.

Skills

P&ID Review

Instrument Datasheets

I/O List Preparation

Cable Schedule

Control Valve Sizing

PLC Architecture

HMI/SCADA Graphics

Interdisciplinary Coordination

Tools

SPI/IN Tools

Instrucalc

3D Model Software

Job description

• Preparation & Review of P&ID diagram
• Preparation of Datasheets for Field instruments, special instruments, JB, Cables, Trays, Instrument fittings etc.
• Preparation of Instrument Index, I/O list, cable schedule, Junction box schedule, wiring diagram, termination diagram, Instrument Hook-up drawing, Instrument location drawing, Earthing layouts, Control schematic diagram, logic diagram and Loop diagram, Instrument installation diagram.
• Preparation of Design basis and Control philosophy for various instrumentation process system and packages/skids
• Sizing of control valve, Safety valve, flow element such as orifice & annubar. Wake frequency calculations for TW in SPI/IN tools/ Instrucalc
• Review and preparation of material requisition/RFQ, vendor offer evaluation, technical bid analysis (TBA).
• Review of vendor documents such as instrument datasheet, Panel wiring & Panel General Arrangement drawings, Power calculation, Earthing drawings
• Preparation and review of PLC Architecture, I/O mapping, review of PLC panel wiring & GA drawings and HMI & SCADA graphics
• Co-ordination with inter disciplines such as Electrical, Mechanical, Process and Civil for instrumentation interfaces.
• Co-ordination with external stakeholders such as vendors, clients & consultant
• Knowledge in review of quality inspection, QA documents, FAT/SAT procedures.
• Exposure on review of instrumentation system in 3D model software