Senior Mechanical Engineer – GA & Piping Design (Water & Wastewater)

Finding solutions to climate change is the priority of the 21st century, and means switching to low-carbon energy. At Assystem, our mission is to accelerate the energy transition worldwide. To achieve this, our 7,500 Switchers combine their historical engineering expertise and project management with digital technologies.

In our 12 countries (Europe, Middle East, Asia) of operation, we are working on the production and distribution of low-carbon electricity, through the development of nuclear and renewable energies. We are also supporting the modernisation and development of energy grids, managing the setup and siting for new transmission and distribution networks, and using hydrogen to decarbonise the transport and industry sectors.

The Assystem Safety & Risk business unit has over 20 years’ experience, delivering bespoke, high-quality safety, risk, and reliability consultancy services to high-hazard industries. We help our clients to minimise risk, delivering improved safety and security and fostering a nuclear safety and risk aware culture. Assystem Safety & Risk delivers an integrated and cost-effective service that includes Safety Case, Human & Organisational Factors (HOF), Risk & Reliability (Including Probabilistic Safety Assessment), Security & Resilience, and Process Safety.

We use deterministic and probabilistic techniques to help our clients to assess the risk associated with facilities and activities and confirm that risks are reduced to a level that is As Low as Reasonably Practicable (ALARP).

Job Summary

We are seeking an experienced Mechanical Engineer with strong expertise in General Arrangement (GA) development, piping design, and routing for water and wastewater treatment facilities. The candidate will be responsible for end-to-end engineering design, ensuring optimal layout, constructability, and compliance with project specifications and industry standards. The role requires strong expertise in electromechanical systems, hydraulic integration, and site execution within EPC/PMC environments.

Key Responsibilities

Mechanical:

Design and review of mechanical equipment at pump stations / Treatment plants and other facilities of Water/sewage treatment plants process and non-process.

Preparation of technical specification, review of vendor data sheet, QAP for mechanical and process equipment, Valves, Gates, cranes

Preparation of mechanical GAD for pumping stations, WTP and STP equipment including lifting arrangements.

Cost estimation for mechanical works.

Inter plant Pipe design, Cross country pipe line design, pipe network, stress analysis, Pipe weld and test requirement, Preparation of pipe and equipment 3D drawings.

Factory inspection and testing: Pumps, valves, pipes, WTP and STP equipment

Piping Design & Routing:

• Design and review piping systems including routing, support philosophy, and isometrics.
• Perform piping material selection based on service (water, sludge, chemicals, etc.).
• Ensure proper piping layout to minimize pressure drops and avoid clashes.
• Prepare piping GA drawings, isometrics, P&IDs, and 3D models.

Engineering Deliverables

Preparation of:

• GA drawings & layouts
• Piping isometrics
• Piping material specifications
• Support drawings and BOM/MTO
• Review vendor drawings and ensure compliance with project requirements.

Experience: 10+ Years

B.E./B.Tech in Mechanical Engineering/Others with relevant experience

Additional certifications in piping design or 3D modelling preferred

Required Skills & Competencies:

• Piping design principles and codes
• Hydraulics and fluid flow in water systems
• Water & wastewater treatment processes

Experience in routing pipelines for:

• Raw water
• Treated water
• Sludge and chemical lines

Ability to perform clash-free 3D layout planning

Strong problem-solving and analytical skills

Good communication and coordination abilities

We are committed to equal treatment of candidates and promote, as well as foster all forms of diversity within our company. We believe that bringing together people with different backgrounds and perspectives is essential for creating innovative and impactful solutions. Skills, talent, and our people’s ability to dare are the only things that matter !. Bring your unique contributions and help us shape the future.