The first goal of this blog is to
- Be able to define and recognize pressure vessels
This begs 2 questions:
- What is a storage tank or vessel?
- How much is 15 p.s.i.g.?
What is a storage tank or vessel? A storage tank or vessel is a container that can be characterized as one of two types.
Either "open" where the total volume changes, via a changing wall like in a piston or in piping. (on the right)
The container walls can be characterized as either thick or thin.
Thick walled containers are designed to contain high pressures and are defined as having a ratio of cylinder radius r to wall thickness t of greater than one tenth.- r/t > 1/10- Examples include cylinders, tanks, gun barrels.
Thin walled containers are defined as having a ration of cylinder radius r to wall thickness t of less than one tenth r/t<1/10- Examples include boilers, pipes.
How much is 15 p.s.i.g.?
p.s.i.g. is a unit of pressure that stands for pounds of force per square inch measured by a gauge. To put this in perspective look at the chart below of the amounts of pressure commonly used by various devices.