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Even Safer Welding

10.01.2007

Safety devices to EN730 standard which includes flame arresters, non-return valves and temperature-sensitive cut-off valves, do not always guarantee maximum protection during oxy-fuel gas welding. The gas technology specialist Witt has enhanced a proven safety device to meet the most demanding requirements with an attractive design.

The pressure-sensitive Super 85 may well rate as the most refined safety device of its type at present. More than that: in comparison to various other systems, which can be found to be inconveniently large and have impractical angled connections or even plastic components, Witt offers a truly slimline “super” model. This will better suit the safety specialist: at approximately 33 by 150 millimetres the Super 85’s  size suits most applications.

The benefit is the straight slimline design. This makes fitting possible in even the narrowest places, regardless of orientation. If a back pressure or flashback should occur, the Super 85's pressure-sensitive cut-off valve interrupts the gas supply in a fraction of a second to prevent explosive mixtures from forming and any further potential hazardous outcome. The outward and visible sign that the safety device has operated is a red warning ring.If the cause of the operating fault has been rectified, the user restarts the gas flow by sliding back the housing sleeve – a safe system.

Red ring signals danger
It is true that safety devices without pressure-sensitive safety mechanisms also respond to flashbacks, thus preventing accidents.But there is a decisive difference: only at the instant of immediate danger, for example, when a flame travels back from the nozzle of the welding torch through the hose to the gas supply, does a simple safety device briefly stop the gas flow through the non-return valve, but then it automatically resets. Here lies the problem: the user often doesn’t realise that his equipment is dangerously malfunctioning, because the interruption lasts only a short while. Potentially a real hazard, because the cause of the fault remains unnoticed and may reoccur.

Safety experts therefore urge the use of safety devices to EN 730 with a pressure-sensitive cut-off valve, which has been available from Witt for decades. Once actuated, the gas flow is shut off permanently. The user realises the hazardous situation and can investigate the cause. When the problem has been rectified, the gas flow can once again be restarted by resetting the device. Pressure-sensitive cut-offs are thus more than just another safety feature: their conception inevitably results in hazard-preventative work processes.

Additional plus: process safety
On the new Super 85 the inner features are also superior: the flame arrester is made of sintered chrome-nickel steel. Protection against contamination from the gas supply is provided by a filter fitted to the gas inlet, which can be changed by the user himself.Features which make for a long service life and complement the good quality of the safety device. It is only a matter of time before this advanced gas technology from Germany will, with this additional safety element find rapid acceptance by companies with a keen focus on safety. Countries like Great Britain and Japan have already made appropriate recommendations.

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Alexander Kampschulte

Alexander Kampschulte

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+49 (0)2302-8901-147

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Contact

Alexander Kampschulte

Alexander Kampschulte

Give us a call!

+49 (0)2302-8901-147

Send request Get callback