Principal Mechanical & Piping Engineer

InSite Technical Services Limited (InSite), part of Vulcain Engineering Group, is a UK-based engineering consultancy with an international footprint, delivering expert engineering design, project management, and technical support across a range of energy and industrial sectors.

With a strong track record in the oil refining, terminals, LNG, and renewables industries, InSite combines its specialist expertise with the scale, capability and global reach of the Vulcain group to help clients meet the challenges of the energy transition and deliver projects that support a more sustainable future.

Our team of experienced engineers and designers bring technical expertise and industry insight to every project, offering value, assurance, and innovative thinking from concept to execution. InSite specialises in conceptualising, designing, and supporting projects that have a lasting, positive impact on the world of tomorrow.

The Position: Principal Mechanical & Piping Engineer

We are seeking a Principal Mechanical and Piping Engineer to join our expanding engineering and design consultancy. This role is central to delivering high-quality Mechanical and Piping design scope across a diverse portfolio of both single and multi-discipline industrial and energy projects.

This role is ideal for an experienced engineer who can lead projects, work seamlessly within a multidisciplinary environment, and engage confidently with clients, vendors, and internal teams.

Some of the main responsibilities of the Principal Mechanical & Piping Engineer will include:

• Lead and oversee the development, review and approval of mechanical and piping engineering deliverables, including design philosophies, specifications, datasheets, material requisitions, piping class specifications, line lists, equipment layouts, piping layouts, isometrics and associated engineering documentation.
• Take technical authority for the mechanical and piping scope across projects, ensuring compliance with applicable industry codes, standards and client requirements, including ASME, API, BS EN and relevant pressure systems legislation.
• Lead the design and specification of static and rotating equipment, piping systems, pressure vessels, storage tanks and associated mechanical infrastructure, ensuring safe, reliable, maintainable and cost-effective engineering solutions.
• Review, verify and approve mechanical and piping engineering documentation to ensure technical accuracy, quality, consistency and compliance with project requirements, company procedures and relevant industry standards.
• Develop and implement solutions to complex mechanical and piping engineering challenges, working collaboratively with process, electrical, control and structural disciplines, and leading discipline input to design reviews, constructability assessments and technical assurance activities.
• Perform or oversee mechanical integrity assessments, piping stress evaluations, equipment selection, material specification and constructability reviews to ensure long‑term asset reliability and operational performance.
• Act as the principal mechanical and piping technical interface with clients, vendors, fabricators, contractors and other stakeholders, leading technical discussions, resolving complex engineering issues, clarifying requirements and supporting key project decisions.
• Lead technical evaluations of vendor proposals, equipment packages and contractor deliverables, ensuring alignment with project specifications, operational requirements and lifecycle performance objectives.
• Provide mentoring, guidance and technical coaching to junior and senior mechanical engineers and designers, fostering a culture of engineering excellence, safety, quality, compliance and continuous professional development within the Mechanical & Piping team.

Preferred Profile:

We are looking for individuals who can bring the following skills and experience:

• Experience of leading mechanical and/or piping deliverables in an EPC project environment, ideally from an engineering and design consultancy setting.
• Have previously delivered design packages across Concept, FEED and Detailed Design for Oil & Gas, Energy, COMAH, Industrial, or similar projects.
• Strong understanding of piping layout, routing and modelling with knowledge of relevant codes, standards and industry practices.
• Comfortable coordinating with multidisciplinary design teams, and confident engaging with EPC contractors & owners / operators.
• Brownfield or modification project exposure is an advantage.
• Ideally, a Chartered Engineer working towards (IMechE ideal).
• Reside locally to Pembrokeshire or be prepared to relocate, as this permanent role does not include travel expense coverage.

Please note many of our UK projects require high‑level security clearance meaning that visa sponsorship is not guaranteed and is assessed on a case‑by‑case basis, depending on role criticality and project needs.

We offer a competitive salary tailored to your experience and background.

We also offer a benefits package, both standard and enhanced, which is designed to support your wellbeing, development, and financial future, including:

• Annual Leave + Bank Holidays
• Pension Scheme (10% employer contribution)
• Life Insurance and long‑term sickness cover
• Medical cover and Employee Assistance Programme (EAP)
• Maternity, Paternity Leave
• Cycle to Work Scheme
• Training & Development, including additional qualifications and accreditations relevant to your role

At InSite, we offer exciting career opportunities for people at every stage - from apprentices and graduates to seasoned professionals.

We’re proud to provide a competitive reward package, flexible working options and generous holiday allowance - because your work/life balance matters.

Join our friendly team in beautiful Pembrokeshire, West Wales, and build a fulfilling career with real responsibility, growth and impact.

If you enjoy tackling challenges and solving problems, you’ll find opportunities to grow your career, stay motivated, and thrive in a dynamic, collaborative environment.

Insite Technical Services is an equal‑opportunity employer. We are committed to creating a diverse and inclusive workplace where everyone is valued and respected. We welcome applications from all individuals, regardless of background, and do not discriminate based on age, gender, disability, ethnicity, religion, sexual orientation, or any other protected characteristic.

If you require any reasonable adjustments during the recruitment process, please let us know, and we will be happy to accommodate your needs.

We appreciate every application. However, due to the volume we receive, we’re only able to contact candidates who are shortlisted for this role or who may be a strong fit for future opportunities.

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