# Homework Help: Pressure Vessel thickness using (operating press./temp., material, OUTSIDE diameter)

1. Jul 29, 2012

### naggar218

1. The problem statement, all variables and given/known data
Problem: find the thickness of a Pressure Vessel.
Given: Operating Pressure, Operating Temperature, Material type and Grade, and OUTSIDE Diameter/Radius

2. Relevant equations
q1. how to calculate Design Pressure/Temp. from Operating Pressure/Temp.?
q2. how to calculate INSIDE Radius using OUTSIDE Radius (note that thickness is needed)?

3. The attempt at a solution
I tried to obtain the thickness of that pressure vessel using (ASME Code SEC.VIII, DIV.2, ARTICLE.2)'s formula, but it only takes INSIDE Diameter, so how can i obtain Inside Diameter to get the thickness.
Or is there any other way that doesn't require INSIDE Diameter to get the thickness.

2. Aug 5, 2012

### rock.freak667

Re: Pressure Vessel thickness using (operating press./temp., material, OUTSIDE diamet

You could use the OD in the equation and then subtract t to get the ID. Then just check to see if the calculated ID can withstand the pressure.

3. Aug 5, 2012

### LawrenceC

Re: Pressure Vessel thickness using (operating press./temp., material, OUTSIDE diamet

Why don't you guess a thickness which then provides an inside diameter. Go through the code calculations with the guessed thickness and see if you come up with the same ratings.

If it's greater than 5 cubic feet there should be paperwork/records on it somewhere.