Hi Group
I was away and missed the original posting.but here is my tuppence-worth
Before commencing in the mining industry I did a stint in the RAN.
Pillar type battery lamps by CEAG and other makers were commonly used in
naval ships (surface and submarine) for emergency lighting.
They were generally bracketted on the bulkheads in appropriate locations and
were usually (although not always) fitted with charging sockets to allow
them to float on line.
I have used them during tank and bunker inspections. Such work was preceded
by flammable gas testing with an oil flame safety lamp and the RN Stokers
Manual gives detailed instructions for such procedures.
Around twenty years ago I purchased a similar Oldham lamp at a military
disposal shop.
Regards
John
.
----- Original Message -----
From: Alan Vickers <[log in to unmask]>
To: <[log in to unmask]>
Sent: Wednesday, February 11, 2004 8:44 PM
Subject: Re: CEAG lamp
> Iain - after I sent my previous posting I realised that I had given
> incorrect information and for this I sincerely apologise.
>
> Methane is not a Group II gas - it is Group I.
>
> At the time when the lamp was made explosive gases were placed in four
> groups so far as the use of electrical equipment was concerned and I give
> below the groupings:
>
> Group I Methane
> Group II Blast-furnace gas, Hydrocarbons. Carbohydrates.
> Group III Coal gas and coke oven gas, Ethylene oxide.
> Group 1V Acetylene, Carbon di-sulphide, Hydrogen, Water gas,
> ethy nitrate.
>
> The higher the group the more stringent the requirements were for
electrical
> equipment. For group IV the use of electrical equipment was not permitted
> and the gases were known as the 'excluded group'. Group II contains the
> majority of industrial gases.
>
> Tankers needed to have electrical equipment in accordance with Group II
> requirements so it is perfectly possible for the lamp to have been used on
> board ship.
>
> As I have been out of the mining industry for some years I am not aware
how
> the grouping of gases may have changed and likewise how the specifications
> for electrical equipment may have changed.
>
> Hope that this helps.
>
> Alan..
>
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