Kerosene Tank Inlet nozzle

[airbus]

It has been asked if we can pull a Kerosene tank completely empty, all available product pumped out. I have heard that the product inlet nozzle should be kept submerged (level above nozzle height) beieng the reason the prevention of the product flasing in the tank. If this is a misconception or it is thrue. If true, what would be the theory (reason) behind it. Thanks in advance for your feedback.

 

[chicopee]

What we have done with empty gasoline tanks was to put dry ice in the tanks and wait for the carbon dioxide vapor to exhaust before pulling out the tanks. Another method, approved by the NFPA, is to direct engine exhaust in the tank until lower flammable limit of gasoline was reached, however, we never use this method. You also could use nitrogen instead of CO2.
I have never heard of the method indicated in your post.

 

[786392]

Dear,
If your tank is connected through total draw off piping protruding into the tank bottom sump provision(for total emptying and/or water drain-out!)
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[/ul]Please do ensure that whole system is properly grounded and bonded to avoid any static discharge or eddy currents induced electric discharge(s)
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[/ul]Moreover ensure that the backing in gravity flow pipeline system must be fully primed not having any possibility of air ingress.
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[/ul]Thereafter the practical safe environment ensuring way is to back-in the product from suction inter-connected piping into this emptied tank at a very very slow rate under gravity flow.
continue till the sump fills up, thereafter increase gravity back in flow rate gradually till
the filling in nozzle gets submerged under 4-5 inches of product level or suffucient to arrest any flashing of product inside the tank.

This is the methodology proved safe practically in many (highly volatile flammable) storage tanks virgin commissioning where CO2(dry ice) or N2(Nitrogen) resources are not available or prove extremely uneconomical.
Hopefully this is one of the probable ways which might be utilized,though our forum greats may guide even better ways and means indeed!
Wish you best of luck anticipating this prove really helpful/safe procedure to go about.

Best Regards
Qalander(Chem)

 

[BigInch]

I think you refer to the inlet nozzle being under the liquid surface level to avoid excessive vapor exchange and static electricity generation in a droplet spray environment.

"People will work for you with blood and sweat and tears if they work for what they believe in......" - Simon Sinek

 

[786392]

Yes, My dear friend!

Best Regards
Qalander(Chem)