Bilge water filtration system

A development of world-wide importance which prevents oily bilge water being pumped into the sea.

Pilot cutters, yachts, fishing boats, superyachts, patrol craft, canal boats, life boats, power boats and ferries: all risk polluting their surroundings when they pump out their bilges. Bilge water invariably contains fuel oil, lubricating oil and grease which cannot be separated and is dumped into the seas and rivers of the world. Legislation to prevent this operates in most parts of the world, and is being progressively tightened. The allowable limit for oil in water discharge, currently 15 milligrammes per litre, is set by the International Convention for the Prevention of Pollution from Ships (MARPOL), under the secretariat of The International Maritime Organisation, United Nations Agency.

Wavestream ends this. Over the past seven years a new filtration system, based on Xoil bonding technology, has been developed for the oil and shipping industries. Xoil is a filter material which bonds with oil. It is processed into sheet-form and converted into simple filter cartridges which fit easily and neatly into the pipework from the bilge pumps.

So effective is Xoil that each filter cartridge will absorb 3 times its own weight of oil. So efficient is Xoil that even the smallest system will handle 40 litres per minute. So welcome is the technology that the entire BT Global Challenge fleet adopted it. So important is the development that Lloyd's Register has given Type Approval to the basic product.

Watermaker protection. The Wavestream filter is ideal for watermaker protection, preventing oils from causing fatal damage to delicate reverse osmosis membranes.

Further information about the products are available on Halyard's web site.

Or you can call Leviathan Marine today for prices and professional advice.

The revolutionary HMI Water Separator and silencer is produced for use with diesel generators, and removes the 'splosh splosh' of water falling from the exhaust outlet while providing additional silencing tested at a startling 80% noise reduction!

Call Leviathan Marine today for prices and professional advice.

Keeping the noise in

Marine diesels create very high noise levels – often well over 100 decibels. Engines are always located close to the boat user, generally in engine spaces made from GRP, timber or steel. Engine noise is then amplified by bouncing around between the hard bulkheads and the steel of the actual engines. Noise contributes seriously to fatigue and seasickness, as well as spoiling life
on board.

Noise insulation changes all this. It adds a soft facing to hard bulkheads to absorb noise and stop it bouncing around and growing. It adds weight to the bulkhead to reduce noise transmission. It features a clever multi-layer construction to make a thin material more effective than simple insulations many times thicker.

If you cocoon the engine with noise insulation you can reduce airborne noise by 85% and transform the comfort for all on board. (Remember structure-borne noise and exhaust noise are separate subjects, covered elsewhere in this site: Halyard can help with both.)

Marine diesels are more of a problem than vehicle engines, because a marine engine shares the hull with you. The insulation you use, therefore, has to be much more effective. The key to HMI Noise Insulation lies in its multi-layer construction. Vehicle insulation is usually a fibre padding which absorbs some noise. HMI insulation has three layers in addition to a protective facing – each with important functions:

The absorption layer
A thick layer of fire zero rated foam which soaks up noise and stops it bouncing around the engine space.

The transmission layer
A high-density barrier provides the highest possible mass and gives the best noise reduction. The HMI damping layer weighs 5kg per square metre – more than the lead sheet used in older materials.

The isolation layer
This thin layer of foam has a crucial function: it acts like the gap in double glazing and stops the noise which hits the transmission layer being carried through to the bulkhead – just like the gap in double glazing.

The multi-layer construction used in HMI materials offers the best possible acoustic result in a range of thicknesses which can be accommodated in the tightest engine space, beating simpler materials many times as thick.

Further information about the products are available on Halyard's web site.

Or you can call Leviathan Marine today for prices and professional advice.

Exhausting noise

Noise is tiring. Noise creates sea-sickness. For the commercial operator it takes the pleasure out of work. For the private user it turns pleasure into hard work. Our objective is to achieve an exhaust noise reduction of around 40% with our basic silencers, 70% with our specialist dual chamber silencers, or 80% with silencers and our exhaust water separation units.

What does a marine exhaust achieve?
A marine engine exhaust system ejects the cooling water as well as silencing the engine’s combustion noise and removing the exhaust gases. The system must create minimal restriction to the flow of exhaust gases, known as back pressure, or the engine may be damaged.

There are four main objectives:

1. To reduce noise by between 40% and 90%.
2. To cool the exhaust, and eject the engine cooling water through the exhaust without excessive back pressure.
3. To minimise the risk of water running back up the exhaust and into the engine cylinders, causing serious engine damage.
4. To site the outlets at the stern of the boat to minimise exhaust fumes on board.

Further information about the products are available on Halyard's web site.

Or you can call Leviathan Marine today for prices and professional advice.

Sensing overheating in marine exhaust systems

Marine diesel exhaust systems are designed to take temperatures of only 120°C. The exhaust gases, however, may reach more than 500°C. To cool the gases, the exhaust depends on a free flow of cooling water from the engine. This flow can be cut off, by a plastic bag or seaweed being sucked into the intake, or by a problem with the water pump. The exhaust temperature will rise immediately to around 450°C, the exhaust will overheat and may be seriously damaged. In most situations Exhaust Alert will warn you before serious damage occurs.

Further information about the products are available on Halyard's web site.

Or you can call Leviathan Marine today for prices and professional advice.