Support for Vertical Vessel

It would be unusual for an organisation to design a <...small vertical pressure vessel, operating at 300 DegC...> without

• having done it before, or
• reference to the required standard or
• reference to advice from the company that is to be supplying burst/collapse indemnity insurance cover on the vessel.

Discuss the problem with an appropriate Mentor at the facility. If one is not available, it would be better, from a liability and from a construction programme perspective, to farm out the design of this vessel to another organisation that can do it.

Firstly, what has 300°C to do with it?

Whether legs, lugs or skirt support is best is likely to depend on the surrounding equipment, and the vessel connections. If those criteria don't point you in a certain direction, go for the cheapest.

"Firstly, what has 300°C to do with it?"

Chocolate legs wouldn't be much use!

Chocolate legs wouldn't be much use at any temperature. 300°C is the vessel operating temperature. The supports might see elevated temperature, it's down to the OP to assess that and select and design the supports accordingly.

...and do make sure that the proposed vessel is reviewed and deemed satisfactory to the organisation providing burst/collapse indemnity insurance before proceeding to order materials and build it. It will want to know about design maximum operating pressure and the fluids wetting it, details of which have been withheld from the forum.

If you design a pressure vessel maybe the design and operating pressures should be mentioned, in addition to the operating temperature?

Those things are the foundations to an acceptable, safe, vessel design.

Need more info."Small" is relative term compared to what?

Describe the vessel with more data.Are the ends concave or convex?

Is the vessel under pressure?Welding on a pressurized vessel is prohibited except by a certified welder,with his number stamped on/near the welded joints, and inspected by the authority having jurisdiction.A pressurized vessel is a very dangerous bomb if not properly designed and maintained.

I saw a high pressure boiler vessel blow out an over-pressure safety valve, which weighed about 500 pounds through the roof,100 feet up,and kept on going over another 100 feet,and fell back through the same hole it made,destroying a lot of equipment below.Fortunately no one was injured.Someone forgot to take out the safety pin after calibration test.My advice to you is let a qualified certified contractor do all work on this vessel and supports.No ad hoc engineering.
Good luck!

(Of course, good luck favors the prepared mind.)

Why does the vessel need to be supported in the first place?

How long must the vessel hold back the pressure, milliseconds or hours?

How do the contents(?) get to that temperature and pressure?

You don't know what you are doing. STOP!

Redfred, This discussion is for professionals to discuss technical matters. So, it is expected replies and answers to be done in a professional and ethical way. May be you did not undertand the question. In this case, you can ask for relevant clarifications in an appropriate way if you are interested in the discussion. Your response is not appropriate, especially when you say " you do not know what you are doing" .

The anonymous poster doesn't know what they are doing. They asked a question with so little relevant information because they didn't know what they were doing in proposing the question or designing a vessel. The initial proffered information and the lack of replies to questions for more clarifying information tells me they should stop whatever they are doing. Pressure vessels are fundamentally bombs. Clueless people should not design bombs. They put themselves and others at risk.

Steam pressure is what blew Mt. St.Helens if you want to see an example of the power of steam.When water hit the hot lava below....