Job Title: Mechanical Design Engineer – Sewerage Treatment Plant (STP)
Experience: 8+ years
Location: Chennai
Industry: STP/Water Treatment/RO
Job summary: A Mechanical Design Engineer working in a sewerage treatment plant (STP) is responsible for designing, selecting, and supporting the installation of mechanical equipment used to treat wastewater safely and efficiently
1. Design Responsibilities-
Design mechanical systems used in wastewater treatment processes.
Prepare equipment layouts, piping layouts, and mechanical drawings.
Design systems for:
Pumps
Blowers
Mixers
Screens
Sludge handling equipment
Aeration systems
Ensure designs meet project specifications, environmental regulations, and safety standards.
2. Equipment Selection-
Select suitable equipment based on plant capacity and process requirements.
Evaluate vendor technical specifications.
Prepare technical data sheets for equipment procurement.
Review supplier drawings and approve them.
3. Engineering Calculations-
Perform calculations for:
Pump sizing
Pipe sizing
Flow rates
Pressure losses
Power requirements
Ensure equipment efficiency and reliability.
4. Drawings and Documentation-
Prepare and review:
Material Submittal preparation
Mechanical General Arrangement (GA) drawings
Piping and Instrumentation Diagrams (P&ID)
Equipment layout drawings
Fabrication drawings
Use software like:
AutoCAD
SolidWorks
Autodesk Inventor
5. Coordination-
Coordinate with:
Civil engineers
Electrical engineers
Process engineers
Contractors
Ensure mechanical systems integrate properly with plant structures and controls.
6. Site Support-
Provide technical support during:
Equipment installation
Commissioning
Testing
Key Skills Required:
Mechanical system design
Knowledge of wastewater treatment processes
CAD software proficiency
Equipment sizing and selection
Understanding of piping systems
Project coordination skills
Typical Employers:
Environmental engineering companies
Water utility companies
EPC contractors
Skills Required
- 8+ years of mechanical design engineering experience
- Experience with sewerage treatment plants, water treatment, or reverse osmosis systems
- Mechanical system design for pumps, blowers, mixers, screens, sludge handling, and aeration systems
- Equipment sizing, selection, technical specification evaluation, and vendor drawing review
- Pump sizing, pipe sizing, flow rate, pressure loss, and power requirement calculations
- Preparation and review of GA drawings, P&IDs, equipment layouts, fabrication drawings, and material submittals
- Proficiency with AutoCAD, SolidWorks, or Autodesk Inventor
- Knowledge of piping systems and wastewater treatment processes
- Ability to coordinate with civil, electrical, process, and construction teams
- Experience providing technical support during equipment installation, commissioning, and testing
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