RAS
Recirculating Aquaculture Systems
Designed to keep
Live Crab "ALIVE"
Everflo designs, manufactures, delivers and commissions fully integrated Live Crab Solutions for trap-fishing vessels. Built on extensive marine and refrigeration expertise, these systems maintain stable onboard conditions to reduce crab mortality and operational losses.
Each purpose-designed package integrates water circulation, air supply, and precision refrigeration control for reliable, efficient performance in harsh marine environments. Everflo is currently involved in 22 new-build projects, each designed for 100–120 tons of live crab.
Live Crab Vessel Technology
Everflo deploys integrated marine systems designed to maintain stable, controlled live-holding conditions and minimise crab mortality.
• Recirculating Aquaculture Systems (RAS) : Precisely control water temperature to reduce stress and metabolic activity
• Water Circulation & Filtration Systems : Continuous seawater exchange, filtration, and treatment to maintain water quality
• Dissolved Oxygen & Air Supply Systems: Controlled oxygenation to support high stocking densities and live holding
• Ammonia-Based Refrigeration Technology: High-efficiency, natural refrigerant systems for reliable marine performance
• Redundant System Design: Built-in redundancy for critical components to ensure uninterrupted operation at sea
• Integrated Control & Monitoring Systems: Centralised monitoring of temperature, oxygen levels, flow rates, and system performance
• Marine-Optimised System Layouts: Compact, low-centre-of-gravity designs to maximise tank volume and vessel stability
(A) Everflo control panels are engineered for reliable, intuitive operation in demanding marine environments. Each system integrates PLC-based control with a clear HMI interface, providing real-time visibility of system performance, pressures, temperatures, and operating status.
Designed with operator safety and simplicity in mind, the panel includes dedicated start/stop controls, fault indication, and emergency shutdown functionality. Robust marine-grade construction and logical layout ensure dependable operation, rapid fault response, and ease of maintenance at sea.
(B) This image shows a marine industrial refrigeration plant room featuring an ammonia-based refrigeration system installed onboard a vessel. The system includes a compressor, electric drive motor, insulated refrigerant piping and auxiliary components, all arranged in a compact, serviceable layout designed for demanding marine conditions.
Everflo also manufactures marine-grade, welded titanium condensers and chillers for reliable, corrosion-resistant performance at sea. The system forms the core of an RAS/ live-holding refrigeration installation, delivering reliable cooling performance, energy efficiency, and operational stability at sea.
the quality of simplicity