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Cable tray/ ladder
lehtommo
4 Posts
Question
We work in a corrosive DSEAR environment and steel tray tends to not last very long. I have previously seen glass Fiber cable ladders being used but someone has pulled up the fact that it isn't suitable for a zone 1/2 area as there could be a build up of static electricity? Anyone have experience of working in such zones and have any alternatives/solutions or even used glass Fiber with information to back this up.

Thanks
3 Replies
In the shipping world it is possible to have pipes in the hazardous areas which are made of glass fibre with carbon in the mix to ensure they are slightly conductive and therefore don't build up static electricity. Take a look at the rules from the major classification societies (Lloyd's Register, American Bureau of Shipping or DNV/GL) or even from the International Association of Classification Societies (www.iacs.org I think) and you may find the requirements for conductivity, etc.

What about using 316L? We use it widely at sea. Yes, it can still corrode, but needs to be a REALLY harsh environment to do anything other than tarnish the surface.

GTB
60 Posts

The requirement to prevent static build up on plastic surfaces/coverings and possible solutions/mitigation is all described in BSEN 60079-14 Para 6.5.

General thought process is to reduce the surface area of any cable support system, so install ladder rather than tray, if plastic covered ladder/tray is used then insulation resistance properties if below 1GOhm then static will dissapate naturally.

Other thing to think about is, what is the hazradous/flammable material, remember the installation must be suitable for the environment and yes plastic/fibre glass may deal with any corrosive nature the material has on steel containment, but what you dont want is the material turning your plastic covered tray of fibreglass tray all gooey after a few years or it getten softened it looses its mechanical strength.

Is Stainless steel a possible option for you?

 

Regards GTB

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