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Services

Graham Hart Process Technology Ltd delivers end-to-end engineering services for high-integrity industrial heat exchangers and specialist pressure equipment. From process and thermal design through to mechanical engineering, advanced manufacturing, spares, replacements and R&D, we provide fully integrated, in-house expertise trusted across the nuclear, oil & gas, chemical, pharmaceutical, food and energy sectors.
Our solutions are engineered for high-pressure, high-temperature, and corrosive service conditions, ensuring long-term reliability and compliance with global standards.

Advanced Manufacturing

Advanced Manufacturing of High-Integrity Heat Exchangers

Our advanced manufacturing facility delivers precision fabrication for high-integrity heat exchangers and pressure equipment. We machine tube sheets up to 2.3 m diameter, weld complex joints to nuclear and subsea standards, and assemble complete units under strict quality controls. Every component is produced with a bespoke Inspection & Test Plan (ITP), ensuring full traceability, industry compliance and reliable delivery of equipment that performs in the harshest operating environments.
Mechanical Design

Mechanical Design Engineering for Pressure Equipment & Heat Exchangers

Our Mechanical Design Engineering team is fully accredited and experienced in global pressure vessel and heat exchanger standards, including ASME, TEMA, PD5500, EN13445 and API. Using advanced 3D CAD and finite design analysis tools, we engineer equipment built for extreme pressures, temperatures and regulatory environments, ensuring structural integrity and safety. We specialise in challenging geometries, high-performance alloys and bespoke engineered solutions for critical applications.
Process and Thermal Design

Process and Thermal Design

Our Process & Thermal Engineering service provides advanced heat exchanger design, combining deep chemical and mechanical engineering knowledge with industry-leading thermal modelling tools. We don’t simply run software, we interpret the complex correlations behind it to deliver accurate, efficient, and duty-specific solutions. Our team optimises thermal performance, energy recovery, heat transfer efficiency and operational stability across a wide range of industrial processes.
Grayham Hart Research & Development

Research & Development for Advanced Heat Transfer Solutions

For over 50 years, we have supported major R&D programmes across nuclear, subsea and advanced heat transfer applications. Our work includes developing new welding methods, improved measurement techniques, innovative joint designs and world-first subsea heat exchanger solutions, including contributions to the UK Submarine programme and next-generation offshore energy technologies. Our R&D capability enables clients to push technical boundaries, improve performance and accelerate innovation.

Spares, Replacements & Heat Exchanger Upgrades

We provide fast, accurate spare parts, replacement components and full replacement heat exchanger units engineered to integrate seamlessly with existing systems. Our team can reverse-engineer legacy equipment, diagnose failure points and design upgraded units that deliver improved performance, reliability and lifecycle cost savings—often outperforming the original design.

Explore R&D Projects

Speak to our engineering team about your project requirements.

Trusted by Industry Leaders

Our solutions support world-class operations across aerospace, pharmaceuticals, energy, food and national infrastructure programmes such as the UK Submarine Programme.
USO 45001:2018 Accreditation