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Exxon aviation reports: neither of the products you mentioned in your email (i gather they mean copper and brass) below are recommended for a Jet A-1 pump impeller. Copper and brass fittings are not suitable for use with Jet fuel as they adversely effect the chemical properties of the fuels.
Only other alternative on that model of fuel tranfer pump is grey iron, but i could not get hold of Exxon rep again to see if that would be satisfactory |
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As well as zinc/galvanized piping and components not being suitable.
I don't think gray iron is a problem, but I myself have never used anything but low carbon steel.??Seems strange that its not available. |
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Now I am beginning to see why we specced stainless: Gray iron, the contractor says, will spark (why more than other metals? and why would it spark in pump if no air or water in there- though i guess it is possible as its in the line direct from storage tanks, before filter/separator.
? |
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That's (obviously) news to me.??I would guess it must have a high(er) dielectric constant.
Perhaps the pump could be at partial levels when starting. |
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| All metals have an infinite dielectric constant though, don't they? .. true about the pump with partial levels when just starting to run...Anyway, latest in this saga is we are going back to contractor to ask him to find a similar spec pump with SS impeller, which I probably should have done in first place. |
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| No they're different, due to the number of extra electrons in the atom.??Gold, Siver, Copper are the best (common) electrical conductors.??I think it also roughly corresponds with the individual metal's heat trans coefficients too. |
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oh you mean as in conductivity, yes different metals would be different
i looked them up --
http://www.eddy-current.com/condres.htm
, it's true SS is low conductivity , and iron is more conductive than brass- tho i am not sure where cast iron stacks up. |
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| ya, that's it... apparently my conductivity is running low. |
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Post at 23/4/2007 00:34
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