Vacuum vessel / distiller correct wall thickness?

It is recommended to use specialized design codes for vacuum vessels to determine the correct wall thickness. In summary, for a vacuum vessel/distiller with a maximum temperature of 200°C and a vacuum of -80kPa, a 4.5mm wall thickness of SS-304 may not be sufficient enough and specialized design codes should be used for accurate calculations.
  • #1
Pantera
1
0
vacuum vessel / distiller correct wall thickness??

Hello!

I have a vacuum vessel / distiller type of vessel with following:-

Temperature inside the vessel max. 200°C [Celcius] and a
Vacuum at max. -80kPa = -0.8bar
Material: SS-304 = Stainless Steel
Volume = 0.654m³
My main question:
Will a 4.5mm wall thickness (SS-304) be sufficient enough?

If yes we will use as "dish ends" 2:1 Semi-ellipsoidal at 6mm THK (Thick) to compensate on the shrinkage on the dish end bend, which is about 18-20%.
OR
I have formuals for pressure vessels / dish ends only - could I use them as well and use 1 bar pressure - to be safe.

Best regards and thank you all already for your suggestions - formulas & help given.

Pantera
 
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  • #2
The wall thickness required will be dependent on the diameter of the tank.

You should not apply pressure vessel design tables to vacuum vessels because the walls of a pressure vessel are in tension, while the walls of a vacuum vessel are in compression. Buckling of a vacuum vessel wall can occur, resulting in collapse of the structure.
 

1. What is the purpose of a vacuum vessel/distiller?

A vacuum vessel/distiller is used to create a vacuum environment in order to separate a mixture of liquids or gases through the process of distillation. It is commonly used in industries such as chemical manufacturing, pharmaceuticals, and food and beverage production.

2. How is the correct wall thickness determined for a vacuum vessel/distiller?

The correct wall thickness for a vacuum vessel/distiller is determined based on several factors, including the internal pressure, external pressure, material strength, and safety regulations. It is typically calculated using industry standards and guidelines, as well as through rigorous testing and analysis.

3. What are the consequences of using incorrect wall thickness for a vacuum vessel/distiller?

Using incorrect wall thickness for a vacuum vessel/distiller can result in several consequences, including structural failure, leaks, and safety hazards. This can lead to equipment damage, product contamination, and potential harm to workers and the surrounding environment.

4. How often should the wall thickness of a vacuum vessel/distiller be checked?

The wall thickness of a vacuum vessel/distiller should be checked regularly, especially before and after each use. It is also important to conduct regular inspections and maintenance to ensure that the vessel is in good condition and meets safety standards.

5. Are there any regulations or standards that govern the wall thickness of a vacuum vessel/distiller?

Yes, there are several regulations and standards that govern the wall thickness of a vacuum vessel/distiller. These include the American Society of Mechanical Engineers (ASME) Boiler and Pressure Vessel Code, National Board Inspection Code (NBIC), and various international standards such as ISO and EN. It is important to ensure that the vacuum vessel/distiller meets these standards to ensure safety and compliance.

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