Who are Alliance?

Specialist Mechanical Engineering & Industrial Site Services

Alliance Site Services delivers high-performance mechanical engineering and industrial site services to the energy, petrochemical, utilities, food processing, and heavy industry sectors across the UK and beyond.

We specialise in the installation, maintenance, refurbishment, and overhaul of critical process equipment, including air cooled heat exchangers (ACHE), shell & tube heat exchangers, rotating equipment, pipework systems, fans, louvers, actuators, pumps, and valves. From greenfield installations to complex shutdowns and emergency breakdowns, we keep plants operating safely, efficiently, and reliably.

Our teams provide end-to-end site support , covering expert mechanical installation, precision pipework fabrication, certified welding and hot works, shutdowns and turnarounds, preventative and corrective maintenance, high-pressure industrial cleaning and jetting, heat exchanger testing and refurbishment, fan assembly and balancing, rigging and lifting, and full commissioning and decommissioning.

Safety and performance are built into everything we do. With highly skilled engineers experienced in high-risk, high-pressure environments, Alliance operates to strict permit-to-work and quality management systems, delivering maximum uptime with minimum disruption.

Whether supporting a planned outage, upgrading ACHE and shell & tube assets, responding to a 24/7 emergency call-out, or delivering a full mechanical scope, Alliance Site Services is your trusted partner for dependable, compliant, and results-driven site solutions.

Our Services

Installation

Alliance Site Services delivers safe, efficient, and precision-led mechanical installation services for industrial plant and process equipment. From air cooled heat exchangers and shell & tube exchangers to pipework systems, fans, pumps, and rotating equipment, our experienced teams manage full site installation, alignment, rigging, and commissioning. We work to strict safety and quality standards to ensure every installation is completed right first time, on programme, and ready for reliable long-term operation.

Maintenance

We provide proactive and reactive mechanical maintenance solutions designed to protect asset performance and minimise unplanned downtime. Our capabilities include preventative and corrective maintenance, shutdown and turnaround support, ACHE and shell & tube heat exchanger servicing, fan and louver inspection, rotating equipment overhaul, and 24/7 emergency response. By combining technical expertise with disciplined site execution, Alliance helps extend equipment life and keep critical operations running safely and efficiently.

Manufacturing

Alliance Site Services offers specialist manufacturing and fabrication support for industrial applications, delivering high-quality, fit-for-purpose components and assemblies. Our scope includes precision pipework fabrication, certified welding, mechanical assemblies, refurbishment of heat exchanger components from basic retubes to full replacement bundles, fan systems, louvers, and bespoke engineered solutions. Every product is manufactured with rigorous quality control, ensuring reliability, compliance, and seamless integration into your site operations.

Our Mission

Uncompromising Safety:

Safety is the foundation of everything we do. Alliance Site Services is committed to protecting people, assets, and the environment through disciplined planning, risk management, and strict compliance with industry and client standards. We operate robust permit-to-work systems, competency management, and continuous training to ensure every task is executed safely, whether during installation, maintenance, shutdowns, or emergency response. By embedding safety into every decision, we create working environments where incidents are prevented, performance is improved, and trust is earned.

Reliability & Responsiveness:

Our clients depend on us to perform when it matters most. Alliance Site Services is built around dependable delivery and rapid mobilisation. We plan thoroughly, communicate clearly, and execute efficiently to ensure projects are completed on time, within scope, and to specification. Whether supporting a planned shutdown, managing a complex installation, or responding to a 24/7 emergency call-out, we provide the responsiveness and accountability required to minimise downtime and keep operations moving safely and effectively.

Technical Excellence:

Technical excellence is achieved through experience, precision, and continuous improvement. We apply proven engineering knowledge, industry best practice, and practical site expertise to deliver high-quality mechanical and industrial solutions. From air cooled and shell & tube heat exchangers to rotating equipment, pipework, and specialist fabrication, our teams work to recognised standards and rigorous quality control processes. We invest in skills, technology, and innovation to ensure our clients benefit from reliable, efficient, and future-proof engineering outcomes.