Fluid Sealing & Engineering (FSE)

Following its acquisition by RSK, FSE further strengthens the group’s water sector capability, contributing extensive experience in the delivery of complex mechanical infrastructure within live water and wastewater treatment environments. The business has developed a strong reputation for safely delivering technically demanding projects where operational continuity, regulatory compliance and coordination with multiple stakeholders are critical.

FSE specialises in the delivery of single-package mechanical solutions, combining design, manufacture and installation under one contract. Its work focuses on complex fluid conveyance and pumping infrastructure, supporting the construction, refurbishment and upgrade of water and wastewater treatment assets. By integrating mechanical systems with associated structural and access steelwork, FSE provides a coordinated approach that reduces interface risk and supports efficient project delivery.

Core services and capabilities:

• Design of integrated mechanical systems
• Supply of mechanical equipment and systems
• Off-site fabrication of mechanical assemblies
• On-site installation within live operational assets
• Delivery of complex fluid conveyance infrastructure
• Installation of pumping systems for water and wastewater treatment
• Provision of associated structural and access steelwork
• Single-package mechanical delivery encompassing design, fabrication and installation

The business operates in accordance with a wide range of industry and regulatory requirements, including Water Industry Mechanical and Electrical Specifications (WIMES), individual water company specifications and relevant British Standards. FSE holds a comprehensive suite of industry accreditations, including ISO 9001, Achilles UVDB, UKAS product certification and SSIP Worksafe, supporting its commitment to quality, safety and consistent delivery.

FSE works primarily within the water and wastewater sectors, delivering projects for water authorities and related asset owners, while supporting other industries that require specialist mechanical engineering solutions. Its project experience includes work within live treatment facilities, where careful planning and technical competence are essential to maintaining operational performance and safety.

With nearly four decades of industry experience, FSE brings established technical capability, practical delivery expertise and a strong understanding of regulated water environments. As part of RSK, the business contributes specialist mechanical engineering knowledge that supports the group’s wider objectives across water, wastewater and environmental infrastructure projects.