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:

o Pumps

o Blowers

o Mixers

o Screens

o Sludge handling equipment

o 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:

o Pump sizing

o Pipe sizing

o Flow rates

o Pressure losses

o Power requirements

Ensure equipment efficiency and reliability.

4. Drawings and Documentation

Prepare and review:

o Material Submittal preparation

o Mechanical General Arrangement (GA) drawings

o Piping and Instrumentation Diagrams (P&ID)

o Equipment layout drawings

o Fabrication drawings

Use software like:

o AutoCAD

o SolidWorks

o Autodesk Inventor

5. Coordination

Coordinate with:

o Civil engineers

o Electrical engineers

o Process engineers

o 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

Sr. Mechanical Design Engineer

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