Marine & Offshore

Construction

Tunnel & Metro

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Industrial & Process

Environmental

Our

Capabilities

80 Years Conquering the Harshest EnvironmentsWITT UK Group has been engineering ventilation solutions for marine and offshore applications since the 1940s, with over 100 offshore installations and thousands of vessels worldwide relying on our systems. From North Sea oil platforms battling Force 12 gales to luxury cruise ships requiring silent operation, from naval vessels demanding shock-proof reliability to FPSO units processing volatile hydrocarbons, our marine heritage runs deep. Our fans withstand the planet’s most punishing conditions—salt spray corrosion, explosive atmospheres, extreme vibration, and temperature swings from Arctic to equatorial. Major projects include Petrobras platforms off Brazil, the Goliath FPSO in the Barents Sea, Ekofisk field developments in the Norwegian sector, and countless merchant vessels, offshore support ships, and naval platforms. Every marine fan undergoes rigorous testing including salt spray exposure to ASTM B117, vibration testing to marine shock standards, and explosion-proof certification for hazardous zones.

Engineered for Maritime ExcellenceMarine and offshore environments demand exceptional durability beyond standard industrial specifications. Our maritime solutions feature 316L stainless steel or specialised marine alloys resisting corrosion, hot-dip galvanising to ISO 1461 for extended protection, specialist coatings including C5-M and offshore specifications, and ATEX/IECEx certification for Zones 1 and 2. We understand the unique challenges of shipboard integration—compact equipment rooms requiring special configurations, stringent noise limits for crew comfort, redundancy ensuring continued operation during maintenance, and compliance with classification society rules. Offshore platforms present additional challenges including process safety requirements for hydrocarbon processing, helideck ventilation ensuring safe operations, temporary refuge HVAC maintaining survivability, and emergency systems for fire and gas scenarios. Whether ventilating engine rooms, providing explosion-proof fans for process areas, managing accommodation HVAC, or ensuring emergency smoke extraction, our solutions meet Lloyd’s Register, DNV-GL, ABS, and other classification society requirements whilst delivering the efficiency improvements demanded by EcoDesign regulations.

Why Choose

Axial Flow Fans

PROVEN SEAWORTHINESS

80 years marine experience with fans operating in every ocean and climate zone.

CERTIFIED COMPLIANCE

Type approved by Lloyd's, DNV-GL, ABS meeting SOLAS, MARPOL, and flag state requirements.

EXTREME DURABILITY

Marine-grade construction surviving North Sea conditions with 25+ year service life.

Frequently

Asked Questions

What makes marine fans different from standard industrial fans?

Marine fans must withstand unique environmental challenges whilst meeting stringent regulatory requirements. Construction uses marine-grade materials—316L stainless steel, bronze, or specially-coated aluminium—resisting salt spray corrosion. Designs accommodate ship motions with reinforced bearings and anti-vibration mounts rated for shock loads. Electrical components meet IP56 minimum protection against wave impact. Regulatory compliance includes SOLAS fire safety requirements, MARPOL efficiency standards, classification society type approval, and flag state regulations. Additionally, marine fans must integrate with limited space, work with variable frequency drives for fuel efficiency, and maintain low noise levels for crew comfort. Our marine fans undergo salt spray testing, inclination tests to 25°, and vibration testing simulating decades of operation.

How are explosion-proof fans designed for offshore platforms?

Offshore platforms processing hydrocarbons require explosion-proof ventilation throughout hazardous areas. Our ATEX/IECEx certified fans prevent ignition through multiple protection methods: flameproof motors containing any internal explosion, increased safety terminals eliminating sparking, anti-static construction preventing electrostatic discharge, and temperature control keeping surfaces below ignition points. Designs meet Zone 1 requirements for areas with explosive atmospheres during normal operation and Zone 2 for abnormal conditions. Additional offshore requirements include materials suitable for sour gas service (NACE MR0175), fire-resistant cables and accessories, deluge testing for platform fire systems, and SIL-rated control systems for safety-critical applications. Every component from motor to mounting undergoes certification ensuring safe operation in explosive atmospheres.

What are the key ventilation requirements for different vessel types?

Vessel ventilation requirements vary significantly by ship type and operational profile. Cargo vessels require engine room ventilation providing combustion air and heat removal, cargo hold ventilation preventing condensation and managing dangerous goods, and accommodation HVAC for crew comfort. Tankers need explosion-proof fans for pump rooms and cargo tanks, inert gas systems preventing explosive atmospheres, and vapour recovery complying with emission regulations. Passenger vessels demand low-noise HVAC for cabin comfort, galley extraction managing commercial kitchen loads, and sophisticated smoke control for evacuation routes. Offshore support vessels require dynamic positioning room cooling, ROV hangar ventilation, and mud pump room extraction. Each application must meet SOLAS requirements whilst optimising for vessel-specific operations.

How do EcoDesign regulations affect marine ventilation?

EcoDesign regulations mandate minimum efficiency levels for marine fans, driving significant improvements in fuel consumption and emissions. Requirements include IE3 efficiency motors as standard with IE4 for larger installations, variable-speed drives optimising part-load operation, and documented efficiency data for Energy Efficiency Design Index (EEDI) calculations. Compliance delivers multiple benefits: reduced fuel consumption lowering operating costs, decreased emissions meeting IMO 2020 sulphur limits, and improved Energy Efficiency Existing Ship Index (EEXI) ratings. Our EcoDesign-compliant fans achieve 5-15% efficiency improvements over previous generations, with variable-speed control adding 30-50% energy savings. For a typical cargo vessel, upgraded ventilation can save 100+ tonnes of fuel annually, reducing CO₂ emissions by 300+ tonnes.

What coating systems protect against marine corrosion?

Marine environments demand sophisticated coating systems beyond standard industrial finishes. Our C5-M coating systems, certified to ISO 12944, provide 15+ years protection in extreme marine conditions. Multi-layer systems include zinc-rich primers providing cathodic protection, epoxy intermediate coats building thickness and chemical resistance, and polyurethane topcoats resisting UV and abrasion. Offshore specifications often require NORSOK M-501 compliance with 25-year design life. Alternative protection includes hot-dip galvanising to ISO 1461 (85-micron minimum), thermal spray aluminium for ultimate durability, and specialist coatings for specific chemicals or temperatures. Quality control includes dry film thickness measurement, adhesion testing, and holiday detection ensuring complete coverage. Proper coating selection and application can extend equipment life from 5-7 years to 25+ years in aggressive marine environments.

How is redundancy achieved in critical marine systems?

Marine ventilation redundancy ensures continued operation during equipment failure or maintenance, critical for vessel safety and operation. Strategies include 2×100% fan arrangements allowing single-fan maintenance, 3×50% configurations providing N+1 redundancy, automatic changeover controls detecting failures, and cross-connections enabling system reconfiguration. Critical systems like engine room ventilation require immediate backup, whilst accommodation systems may accept brief interruptions. Our designs incorporate duty/standby rotation equalising wear, maintenance bypasses allowing online servicing, common spare strategies minimising inventory, and remote monitoring enabling predictive maintenance. For offshore platforms, redundancy extends to temporary refuge HVAC maintaining survivability during emergencies, with backup power, fire dampers, and gas-tight isolation ensuring 60+ minute protection for personnel awaiting evacuation.

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