Calculating Wall Thickness and Bolt Diameter for a Spherical Pressure Vessel

In summary, the conversation discusses the construction of a spherical pressure vessel with a diameter of 2m using two hemispherical domes with flanges and 12 bolts. The question at hand is to determine the wall thickness of the dome and the diameter of the bolts based on a maximum applied pressure of 0.7MPa, a maximum stress of 50MPa in the spherical shell, and a maximum stress of 200MPa in the bolts. The conversation suggests using the formula σ=(internal pressure*mean radius)/(2*thickness) and plugging in numbers to determine missing information.
  • #1
mattyboson12
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A spherical pressure vessel of internal diameter 2m is constructed by bolting together two hemispherical domes with flanges. Assuming that the number of bolts used to join the two hemispheres together is 12, determine the wall thickness of the dome and the diameter of the bolts, if the maximum applied pressure is 0.7MPa, the maximum stress in the spherical shell is 50MPa and the maximum stress in the bolts is 200MPa.

I really don't where to start with this question so was wondering if anyone could give me any hints. I know that for a thin sphere the membrane stress is σ=(internal pressure*mean radius)/(2*thickness)
 
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  • #2
Maybe try to plug in some numbers and see what information you have or missing.
 

1. What is a pressure vessel and how does it work?

A pressure vessel is a container designed to hold gases or liquids at a pressure significantly different from the ambient pressure. It works by exerting a pressure on the contents inside, which helps to keep the gases or liquids in a stable state. The vessel is typically made of strong materials that can withstand high pressure, such as steel or titanium.

2. What are the different types of pressure vessels?

There are several types of pressure vessels, including storage vessels, process vessels, heat exchangers, and reactors. Storage vessels are designed to store gases or liquids, while process vessels are used to carry out chemical reactions. Heat exchangers are used to transfer heat between two fluids, and reactors are used to facilitate a chemical reaction.

3. How do you determine the appropriate material for a pressure vessel?

The material for a pressure vessel is chosen based on several factors, including the type of gas or liquid being contained, the operating pressure and temperature, and the required strength and corrosion resistance. Materials commonly used for pressure vessels include carbon steel, stainless steel, and aluminum. The design codes and standards for pressure vessels also provide guidelines for selecting the appropriate material.

4. What are the safety precautions that need to be taken when working with pressure vessels?

When working with pressure vessels, it is important to follow proper safety protocols to prevent accidents and ensure the integrity of the vessel. This includes regular inspections, proper maintenance, and following the design codes and standards for pressure vessels. It is also important to properly train personnel who will be working with the vessel and have emergency procedures in place in case of a malfunction.

5. How do you perform a pressure test on a pressure vessel?

A pressure test is conducted to ensure the integrity and safety of a pressure vessel. It involves filling the vessel with a liquid or gas and increasing the pressure to a predetermined level. The pressure is then held for a designated amount of time, and any leaks or deformations are monitored. The test is considered successful if the vessel maintains its pressure without any changes. The specific procedure and requirements for a pressure test may vary depending on the type and purpose of the vessel.

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