Senior Mechanical Engineer

Wolviston Management Services; Tees Valley; Hybrid; GBP 100,000 - 125,000; Full time

Job summary

A leading engineering company based in Darlington is seeking a Senior Mechanical Tank Engineer to lead design activities on large-scale oil, gas, and LNG projects. This role involves mechanical design and analysis of tanks and pressure vessels, mentoring engineers, and ensuring compliance with regulations. The position offers hybrid working, career development opportunities, and competitive benefits including 25 days holiday and a 10% employer pension contribution.

Benefits

25 days holiday (rising to 28)

Holiday purchase scheme

10% employer pension contributions

Life insurance (4x salary)

Access to wellbeing initiatives like yoga classes

Free secure parking

Qualifications

• Degree-qualified in Mechanical Engineering.
• Chartered Engineer status (or working towards) is desirable.
• Strong experience in mechanical design within oil & gas, LNG, or petrochemical projects.

Responsibilities

• Deliver mechanical design of storage tanks, pressure vessels, and heat exchangers.
• Conduct engineering calculations and finite element analysis.
• Prepare and check technical documents and specifications.

Skills

Mechanical design

Finite element analysis

Stress assessment

Design codes application

Team leadership

Communication skills

Education

Degree in Mechanical Engineering (BEng or MEng)

Tools

ANSYS

AutoCAD

SmartPlant 3D

Job description

Location: Darlington, Co Durham

Contract Type : Permanent / Full Time

Are you an experienced Senior Process Engineer looking to work on cutting‑edge liquefied gas projects with a company that values innovation, flexibility, and professional development? We are exclusively recruiting for a permanent Senior Process Engineer on behalf of Whessoe Engineering Ltd, a world‑renowned leader in engineering, procurement, and construction (EPC) services, with over 200 years of excellence in the industry, based in Darlington.

Why join Whessoe Engineering?

Whessoe Engineering is a multidisciplinary engineering firm with a strong reputation for delivering complex projects in the hydrocarbon, petrochemical, and energy sectors. As part of the Samsung C&T family, they offer their engineers the opportunity to work on high‑profile, global projects, providing world‑class solutions in process engineering.

Flexible working

Choose between a 40 or 37‑hour work week, adjusting your hours around core office times (Mon‑Thurs: 10am‑3pm, Fri: 9am‑1pm) to suit your lifestyle.

Hybrid working

After a familiarisation period, employees can work 2 days per week from home.

Career development

Work on complex, multi‑disciplinary projects where you will take the lead on process design, simulation, and safety reviews, gaining invaluable experience in the field.

Strong company benefits include 25 days holiday (rising to 28), a holiday purchase scheme, 10% employer pension contributions, free secure parking, life insurance (4x salary), and access to wellbeing initiatives such as regular yoga classes.

The role – drive engineering excellence in global energy infrastructure

As a Senior Mechanical Tank Engineer, you will play a key role in the mechanical design and analysis of tanks, pressure vessels, and heat exchangers for large‑scale oil, gas, and LNG projects.

Based in Darlington, with opportunities to travel to UK and international sites, you will lead design activities, supervise engineering teams, and contribute to major infrastructure programmes across the energy sector.

Key responsibilities

• Deliver mechanical design of ambient and cryogenic storage tanks, pressure vessels, and heat exchangers
• Conduct engineering calculations, stress assessments, and finite element analysis (ANSYS, STAAD, Caesar II)
• Prepare and check technical documents including design reports, specifications, and datasheets
• Apply design codes such as API 620 / 650, ASME VIII, and Eurocodes
• Lead and mentor other engineers and interface with design draughting teams
• Support tender development, including labour‑hour estimation and technical input
• Ensure compliance with client requirements, project schedules, and internal quality procedures

What we’re looking for

• Degree‑qualified in Mechanical Engineering (BEng or MEng)
• Chartered Engineer status (or working towards) is desirable
• Strong experience in mechanical design within oil & gas, LNG, or petrochemical projects
• Proficient in design and analysis of storage tanks, vessels, and thermal equipment
• Working knowledge of FEA and stress analysis tools (ANSYS, STAAD, Caesar II)
• Familiar with AutoCAD, and ideally 3D tools such as SmartPlant 3D, PDMS, or Inventor
• Experience applying major design codes (API, ASME, Eurocodes)