impeller material for use with jet A-1 Fuel
impeller material for use with jet A-1 Fuel
(OP)
Normaly in our tank farm specs and dispensing specs we call for stainles steel impeller impellers on Jet A-1 pumps but our contarctor can only get brass or cast iron. I can't seem to find anything on which is more compatible and better to use, the brass or CI? Which would be more appropriate?
Thanks Heather
Thanks Heather





RE: impeller material for use with jet A-1 Fuel
BigInch
-born in the trenches.
http://virtualpipeline.spaces.msn.com
RE: impeller material for use with jet A-1 Fuel
Now I have to find out why the SS impeller was specced in first place. Pump Mfger says brass impellers are standard for petroleum jobs. We (Govt) have std specs for tank farms and dispensing facilities.
Also we have, for some reason, stainless piping starting after the filter unit in our standard set-up for dispensing bldgs (this is for small northern airport).
Do we need a relaxation unit for Jet A1 to reduce static after the filter? We have had one in our std. but i am told it is not necessary nowadays.
RE: impeller material for use with jet A-1 Fuel
I am not sure what a relaxation unit is. But static buildup can be a serious problem. We had a tanker truck explode a few years ago when loading a grade of #1 fuel oil. We are now required to inject a conductivity improver chemical to help prevent this. I would not suggest eliminating any system designed to control static unless you are very sure you know it is not needed.
Johnny Pellin
RE: impeller material for use with jet A-1 Fuel
If API uses brass or bronze impellers for process pumps shouldn't our small transfer pump (Gorman Rupp) then be made of one of those materials? Their tech person told me that brass was standard with their fuel pumps for petroleun product use...
RE: impeller material for use with jet A-1 Fuel
I don't get involved with final distribution at the airport, but I know that anti-static treatments (Static Dissipater Addatives, SDA) are chemical additives that must be added after the last terminal tank (pumping tends to disassociate that chemical) and is used with JP-8 = Jet A= Jet A1. It is not added to JP-5 (US Navy), so the practice there is totally relying on limiting fill velocities to < 1 m/sec and doing slow fills (filling >10 minutes), bottom tank loading, static grounding are common handling techniques, as is the case for all aviation fuels, due to both the possible build up of static on the AC and the fuels too (which can reach 50 kV). "Relaxation" by letting freshly pumped fuel sit in tanks for 30 minutes or so, I believe is also common, especially in cold dry climates, so I wouldn't eliminate that practice. With the newer fuels and additives, I think some of that practice might be left over from previous days when AC fuels were more explosive, but with up to 50 kV possible, I certainly won't say its not worth continuing to do it.
It would be interesting to find out if the pump vendors do not routinely supply brass to other AV fuel clients. Could let us know what you find out there?
BigInch
-born in the trenches.
http://virtualpipeline.spaces.msn.com
RE: impeller material for use with jet A-1 Fuel
RE: impeller material for use with jet A-1 Fuel
BigInch
-born in the trenches.
http://virtualpipeline.spaces.msn.com
RE: impeller material for use with jet A-1 Fuel
Fuel Facilities
http
Static Electrictiy
htt
Aircraft fuel static safety and cleanup http://ww
BigInch
-born in the trenches.
http://virtualpipeline.spaces.msn.com
RE: impeller material for use with jet A-1 Fuel
RE: impeller material for use with jet A-1 Fuel
BigInch
-born in the trenches.
http://virtualpipeline.spaces.msn.com
RE: impeller material for use with jet A-1 Fuel
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
RE: impeller material for use with jet A-1 Fuel
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.
BigInch
-born in the trenches.
http://virtualpipeline.spaces.msn.com
RE: impeller material for use with jet A-1 Fuel
RE: impeller material for use with jet A-1 Fuel
Perhaps the pump could be at partial levels when starting.
BigInch
-born in the trenches.
http://virtualpipeline.spaces.msn.com
RE: impeller material for use with jet A-1 Fuel
RE: impeller material for use with jet A-1 Fuel
BigInch
-born in the trenches.
http://virtualpipeline.spaces.msn.com
RE: impeller material for use with jet A-1 Fuel
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.
RE: impeller material for use with jet A-1 Fuel
BigInch
-born in the trenches.
http://virtualpipeline.spaces.msn.com