Cryogenic Liquid Cylinder Perfomance "NER"

[ampis]

Back Ground:-
I am talking about cryogenic Liquid Cylinder.
The Cylinder is Super + vacuum Insulated.

Previously we were using 500 mm diameter outer vessel. But now they have changed it to 550 mm Diameter Outer vessel.
( Done to accomodate more layers of insulation)

Even after the increased layers of insulation the prefomence remains the same.

My point of view is that, since the outer dia of the vessel is increased we are using higher length of the copper tube. (For both pressure builder + vaporizer) there fore ubable to get the desired perfomance(1 meter approx). By cutting the length of the copper tube we can reduce conduction through copper and get a better perfomance.

But i am not getting enough support from my seniors. They are more focused towards the insulation efficiency. Eventhough we used same insulation material in both cases.

I have joined recently as product developer and do not know weather my case has any merit. Please provide your suggestions.

 

[DrLewinstein]

Just a couple of thoughts...
1. This forum is for wastes and wastewater. You may want to put it on the mechanical engineering forum.
2. I could not tell from your explanation how the cylinder was configured, but I do remember from heat transfer class that there was a critical thickness of insulation that could be applied because at some point the heatloss from increased surface area of the insulation offset the savings from the increased thickness of it. Not sure if this is what you were talking about or not.