High-Integrity Heat
Exchangers & Pressure
Equipment for the
World's Most
Demanding Industries

Safe Professional Innovative

For over 50 years, we've combined advanced process and mechanical design with precision manufacturing to build high integrity and pressure equipment trusted in the harshest operating environments.

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Our Products

Our Services

Sectors We Cover

Industry Insights

Engineering Excellence for Critical Industries

Graham Hart Process Technology Ltd is a world leader in the design and manufacture of bespoke heat transfer and specialist pressure equipment. With more than five decades of experience, we engineer every unit to precise client requirements, ensuring optimal performance, safety and longevity in mission-critical environments.

Our team of process and mechanical engineers provide deep technical understanding, supported by advanced software, rigorous risk assessment and fully integrated digital management systems. Whether your operation faces extreme pressures, aggressive media or stringent regulation, our equipment is built to deliver long-term reliability and confidence.

Since 2016, we have maintained a 100% On Time In Full delivery record—demonstrating our commitment to quality, professionalism and customer success.

Single Suppy Chain

Design, procurement, manufacture, testing and certification all in-house.

Precision Engineering

From advanced process modelling to large-scale machining up to 2.3 m diameter and 460 mm thick.

Proven Reliability

Over a decade supplying the UK Submarine programme and world-first subsea heat transfer innovations.

Global Trust

Preferred partner to leading organisations including Airbus, BOC, GE, PepsiCo and Tata.

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Heat Exchanger Solutions

Shell & Tube Heat Exchangers

Robust and versatile units engineered for high-pressure, high-temperature and corrosive environments.

Air Cooled Heat Exchangers

Efficient cooling systems ideal for water-scarce locations and remote operations.

Crossflow & Heat Recovery Systems

Custom designs for stack gas recovery, combustion air preheating and process fluid heating.

Bespoke Engineered Equipment

Fully customised heat transfer solutions designed around your process, duty and operational environment

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Sectors we serve

Engineered for the Harshest Industrial Environments

Our equipment is built to perform in the most challenging global applications — from subsea to nuclear, from sterile pharmaceutical environments to corrosive chemical processing.

Industry Sectors:

Nuclear

Safety-driven designs meeting the highest integrity standards.

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Oil & Gas

Proven performance from FPSO vessels to 3 km subsea operations.

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Chemical

Critical equipment supporting sterile and controlled environments.

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Petrochemical

Precision-engineered for corrosive and high-temperature processes.

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Food & Drink

Reliable, hygienic systems tailored to demanding production facilities.

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Pharmaceutical

Critical equipment supporting sterile and controlled environments.

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Insights from Our Engineers

Expert guidance, case studies and technical updates.

Case Study

World-first topside-less subsea multiphase boosting system (3 km subsea, super duplex construction)

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Technical Insight

Advanced welding for leak-free tube end joints.

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Guide

Pressure equipment standards and compliance pathways.

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Ready to Discuss Your Project?

Our engineers are here to help you develop safe, reliable and efficient heat transfer solutions tailored to your process.

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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.