small phone (+44) 01524 581500

mail j.cross@desiccantdryair.com

Applications
& benefits

  • defence
  • cost reduction
  • Protect electronics from corrosion
  • State of readiness
  • Chemical breakdown
  • Navy ships
  • Aircraft

applications

Application Examples

In Defence, humidity should be taken very seriously. Defence equipment will always be a huge outlay of capital expense for any government and needs to be protected when not in use.

Equipment from a MBT to Landrover or an aircraft carrier to a Euro fighter will remain in a state of readiness but may not be protected from the elements such as ambient humidity.

Defence equipment can remain unused for years and if not stored correctly, humidity can be the cause of mechanical & electrical problems encountered by many of the Armed Forces worldwide.


Here at Desiccant Dryair Systems we have a proven track record of protecting equipment for the Army, Royal Air Force and Royal Navy, also for Rolls Royce, Jaguar, Aston Martin and many more.

With our desiccant dehumidifiers we can remove the water in the air to a level that slows or totally stops corrosion; this in turn means fewer break downs and the monthly service will be replaced with much longer periods between inspections & service.

This also means less time required by trained technicians to carry out needless servicing and thus fewer components need changing meaning lower costs over the life of the equipment.


Cost reduction

In all storage applications operational costs can be greatly reduced by the reduction of the relative humidity over the ambient conditions. It will directly reduce the amount of damage and corrosion derived from high moisture content in the air. There are two ways of reducing relative humidity, one is to heat the air and the other is dehumidification.

By heating the air, the air volume expands and the humidity level indirectly becomes lower. The problem occurs when the air has to be heated over ambient temperatures all year round. This method does not remove any water from the air and is very expensive. The dehumidification method is to directly remove the problem, this being the water in the air. It has many advantages such as cheaper running costs it also provides a more comfortable working environment for staff.

In the early 1920’s work carried out by Vernon showed that there is a direct relationship between the corrosion of steel and relative humidity and on a graph it is known as Vernon’s Curve as the corrosion accelerates vertically when humidity reaches 55%. We carried out research in the early 1990’s with the former British Steel at their research facility in Ebbw Vale in South Wales; this was in relation to a customer request for the storage of automotive steel. We were the first to implement a system of Dry air over a preferred method of dry heat to lower the relative humidity at Widnes Steel Storage facility. It has been running since 1993 originally for Ford but now Jaguar and Landrover with £190 million of steel throughput per year, with no corrosion ever recorded.


Protect electronics from corrosion

Electronics have a high failure rate when high humidity is present in the air especially when the circuitry has no current passing through to generate small amounts of residual heat which would dissipate the moisture. Humidity accelerates electrolytic corrosion to the soldered joints in many cases causing a dry joint where the corrosion prevents a good connection.

Very high humidity can cause arcing across the components causing the board to become un- repairable and generating a fire hazard. Dry air prevents these problems and eliminates many of the nuisance fault conditions that can occur.

Elimination of Fungus and Mould

High humidity and temperature is a necessity for the growth of Fungus and moulds that attack many items like fabrics, leather and wood which can be present in many military vehicles. We have supplied many units for applications to prevent mildew on seats and interiors of vehicles, in particular Ferrari in Hong Kong. By lowering the humidity to 45 - 50%, the growth of fungus is prevented and usually eliminated.


State of readiness

Vehicles and equipment that are stored in Controlled Humidity Environments are always at a state of readiness. They can be kept at a high quality without any degradation for long periods of time when incorporated with a battery conditioning system.

Maintenance periods can be greatly extended without fear of failure when required. No background heat is required so it is cost effective and assured.


Chemical breakdown

Chemical breakdown can also be attributed to high humidity. Explosive material can become volatile meaning that the ammunition has only a certain life span before it has to be taken away, made safe and replaced with new.

There is also a problem that occurs with the projectile coming loose due to corrosion between the dissimilar metals of the projectile and the casing. Electrolytic corrosion is a major problem for any dissimilar metals where high humidity is present. Dry air can prevent this, which means shell life expectancy is greatly increased.

 

Navy ships

We provide our units to the Royal Navy and Merchant Naval companies. With the variance in sea temperature occurring as a vessel sails from one country to another, Dry air is used to eliminate condensation forming below the waterline and in cargo holds. It can be used to protect control rooms, ammunition magazines, engine rooms etc.

When in storage, the entire ship is filled with Dry air in a re circulation mode to eliminate corrosion for long periods of time.

 

Aircraft

Aircraft use dry air for both closed and open CHE. While on the pan or in a hardened shelter the aircraft is supplied with an open CHE. Dry air is blown into the vulnerable areas of the aircraft such as engines and fuselage, usually by a small machine with a high IP rating and a total loss system to prevent condensation forming after the aircraft has been in operation and is cooling down.

Closed CHE is used when the aircraft is put into a building for a period of extensive maintenance, as in a total strip down. This would be a re- circulating system and thus larger in size.

The Dryair dehumidifier can be used anywhere. As required we can build it into an existing system or deliver a bespoke unit to produce exact conditions.

We are one of the preferred suppliers to the MOD for companies like AWE, DSTL and others that require a high standard and consistent conditions. For these special applications we have a purpose built test facility that we can use to simulate most conditions around the World to test the machine operation. We also provide these units to food and pharmaceutical companies.