Fluid System Design Engineer - Test Rig Design (Submarines)

Rolls-Royce; East Midlands; Hybrid; GBP 40,000 - 60,000; Full time

Job summary

A renowned engineering firm in Derby seeks a Fluid System Design Engineer focused on test rig design for nuclear submarines. The candidate will work on both Verification and Validation testing, collaborating within integrated project teams. A degree in mechanical or chemical engineering and experience in regulated industries are essential. The role offers competitive salary, hybrid working, and excellent development opportunities.

Benefits

Competitive salary

Employee support assistance

Employee discounts

Qualifications

• Experience in designing process plant facilities like oil and gas systems.
• Degree in mechanical engineering with thermo-fluids content.
• Sound knowledge of applicable codes & standards.

Responsibilities

• Generating requirements and planning tasks.
• Applying fluid flow theory to inform design decisions.
• Development of Pipework and Instrumentation Diagrams (P&ID).
• Creation of 1D system flow models.

Skills

Design of process plant facilities

Experience in regulated industries

Complex fluid/chemical process systems

Engineering principles

HAZOP/HAZID/SWIFT/FMEAs

Education

Degree in mechanical or chemical engineering

Tools

1D flow modelling software (FloMaster)

Job description

Fluid System Design Engineer - Test Rig Design (Submarines)

Full Time

Derby

Fluid System Design Engineers to undertake rig design to support both Verification and Validation (V&V) and production testing of Nuclear Steam Raising Plant components. The role involves working as part of Integrated Project Teams to design new and modify existing multi-million-pound test rig designs, the bulk of which are in our Test Laboratory at our main offices at Raynesway in Derby

Why Rolls-Royce?

Rolls-Royce is one of the most enduring and iconic brands in the world and has been at the forefront of innovation for over a century. We design, build and service systems that provide critical power to customers where safety and reliability are paramount.

We are proud to be a force for progress, powering, protecting and connecting people everywhere.

We want to ensure that the excellence and ingenuity that has shaped our history continues into our future and we need people like you to come and join us on this journey.

Our nuclear business is a leader in propulsion system design and development for the Royal Navy's nuclear submarine fleet and the sole provider and technical authority, managing all aspects of plant design, safety, manufacture, performance, and through-life support.

We’ll provide an environment of caring and belonging where you can be yourself. An inclusive, innovative culture that invests in you, gives you access to an incredible breadth and depth of opportunities where you can grow your career and make a difference.

What we offer:

We offer excellent development opportunities, a competitive salary, and exceptional benefits. These include bonus, employee support assistance and employee discounts.
Hybrid working is a way in which our people can balance their time between the office, home, or another remote location. It’s a locally managed and flexed informal discretionary arrangement. As a minimum we’re all expected to attend the workplace for collaboration and other specific reasons, on average three days per week.

What you will be doing:

• Generating requirements, scoping work, and planning tasks in conjunction with stakeholders.
• Applying standard fluid flow and thermal hydraulic theory to inform and justify design decisions around system layout, component selection and sizing. Examples include:
  • Creation of Pipework and Instrumentation Diagrams (P&ID) and the associated valve and equipment schedules.
  • Pump, valve (inc. safety relief) and heat exchanger sizing and selection.
  • Development of 1D system flow models, derivation of loss coefficients etc.
  • Development of operating philosophies and high-level control system logic.

Who we’re looking for:

At Rolls-Royce we put safety first, do the right thing, keep it simple and make a difference. These principles form the behaviours that guide us and are an essential component of our assessment process. They are the fundamental qualities that we seek for all roles.

• Experience of design of process plant facilities, such as oil and gas pipework systems or chemical process facilities, is desirable.
• Experience, where possible, in a relevant, heavily regulated industry, such as Chemical, Pharmaceutical, Energy, Water or Nuclear.
• Experience of specifying, designing, justifying, or operating complex fluid/chemical process systems.
• Degree (or equivalent) in mechanical engineering, chemical engineering, or another science or engineering discipline with thermo-fluids content.
• Track record of delivering solutions against specific customer requirements to time, cost, and quality.
• Sound knowledge of engineering principles, process safety, and applicable codes & standards.
• Understand of design process and design and safety assessment processes and tools e.g., HAZOP/HAZID/SWIFT/FMEAs etc.
• Desirable to have experience in the use of 1D flow modelling software (specifically FloMaster).

We are an equal opportunities employer. We’re committed to developing a diverse workforce and an inclusive working environment. We believe that people from different backgrounds and cultures give us different perspectives which are crucial to innovation and problem solving.

We believe the more diverse perspectives we have, the more successful we’ll be. By building a culture of caring and belonging, we give everyone who works here the opportunity to realise their full potential.

You can learn more about our global Inclusion strategy at Our people | Rolls-Royce

To work for the Rolls-Royce Submarines business an individual has to hold a Security Check clearance. Rolls-Royce will support the application for Security Clearance if you do not currently already have this in place. Due to the nature of work the business conducts and the protection of certain assets we can only progress applications from individuals who are a UK national or, in MoD approved cases, a dual national.

Job Category Validation and Verification Posting Date 16 Oct 2025; 00:10 Posting End Date 23 Oct 2025