This belongs in chemical engineering forum.
What are you trying to achieve?
Do you have a maximum/minimum flow that you need?
Max/min pressures?
I presume that you are working from a bulk tank.
Typically, you use an aluminum vaporizer that is sized for your flow and local climate conditions.
The liquid tanks usually come in two different pressure ratings, 150psi or 250psi.
This goes for smaller portable liquid gas tanks also.
Contact your bulk gas supplier.
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P.E. Metallurgy, consulting work welcomed