Tuesday, 25 September 2012

Low Smoke Halogen Free Cable

As safety takes paramount place in today’s world, contractors and builders are turning their attention to products that are safer, more co-friendly and non-hazardous such as LSHF cable. Low smoke halogen free cable offers a great alternative to PVC cable when installing in areas or environments where there is a higher threat of fire which poses risk to human life, animal life or if there is a high volume of costly equipment.

low smoke halogen free cable
The improved material emits a much lower percentage of smoke and contains no halogens – therefore not producing the toxic gases that PVC cabling typically gives off when in contact with fire or very high heat. If a plastic of halogen content comes into contact with flames, it releases hydrogen chloride, and when this chemical comes into contact with H2O it turns into injurious hydrochloric acid. Halogen free cable has been designed to combat this and to protect the health of both humans and animals in highly populated areas, but also to safeguard expensive equipment, servers and data centres. Vitally important computing equipment that comes into contact with smoke can cost a company hundreds of thousands of pounds.

A low smoke halogen-free cable, also known as low smoke zero halogen cable, is generally made from a thermoplastic or a thermoset material, that under conditions of fire will give off very limited smoke and no halogen. A cable has to have less than 0.5% halogen to be deemed halogen free. The halogen content is of 3 tests that are used to standardise LSHF cable, with the other two being tests on their smoke density and flame transmission. , All tests adhere to the industry standards set by the IEC (International Electrotechnical Commission) and the VDE (Verband der Elektrotechnik) . 

Halogen free cable is being used more and more in a variety of different applications as contractors and individuals demand safer and less hazardous surroundings. Where there is risk to property, equipment or to human life LSHF cable is always used. In areas, buildings or vehicles in which there is low ventilation it is imperative to use the correct standard of cable. It plays an important part in many fields such as the transport industry and the hospitality and entertainment sector.

Below are some of the commonly found low smoke halogen free cables;

•    OLFLEX 120 H
•    OLFLEX 120 CH
•    OLFLEX CLASSIC 130 H BK 0,6/1kV

For more information on LSZH cables, please visit: www.lowsmokehalogenfreecable.co.uk/home.htm

Monday, 17 September 2012

What is Hydrostatic Testing?

Hydrostatic hose testing is one of the most common methods for testing hoses, pipes and other pressured vessels. If the test is successful, it then qualifies the product to be used under a specific stress or environment and for a specified length of time.

The market for scientifically proven pipes, hoses and assemblies is extremely competitive. These products need to bear up against stringent and methodical testing over a long period to determine their strengths and weaknesses.

Hydrostatic testing is typically conducted under the specifications of the hydrostatic testing supplier, the industry standards or the customer. Generally, the testing is carried out inside a sealed and closed system to minimise any errors and give ultra-precise readings. A regular test procedure is to fill a container with a liquid that has incompressible properties, usually water, dyed water or oil, and then to place the vessel (i.e. the hose) inside the container and apply pressure inside the closed system. The applied internal pressure and the duration are normally always fixed.

This known pressure is typically a great amount larger than the usual specified operating pressure of a device – generally around 150%. As the pressure is applied it causes the vessel to expand and both the permanent and the total pressure expansion are carefully measured.

These measurements, together with internal and external visual checks, are used to ascertain whether or not a pressurised vessel can be used safely. This also gives an understanding of the lifetime of the container – this is typically determined by the exemption or specification to which a pressure vessel has been manufactured. A product must be condemned if its structural integrity is abnormal, is degraded or if it fails.

This is an extremely important testing procedure to identify how safe and/or durable a device is under pressure and also to identify any leaks that a vessel may be prone to developing. These hoses and pipes can be used to transport dangerous or hazardous substances – areas where there is no room for errors or manufacturing floors.

All quality hose testing and hydrostatic testing companies keep computerised records of their products and will monitor each unit throughout the course of its lifetime. This ensures that mistakes are kept to a minimum and if any unexpected problem occurs the computerised systems will quickly notify the user or the manufacturer.