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# How to reduce thickness in Compress?

## How to reduce thickness in Compress?

(OP)
I have a pressure vessel that has an internal pressure of 900psi and temp of 970F. I run the calcs and compress gave me a thickness of 4" for the vessel and 6" for the heads. I just want to make sure that I can not reduce the thickness anymore. I know for full vacuum chambers I can reduce the thickness by using stiffeners.

### RE: How to reduce thickness in Compress?

You could change materials.  That's about it.

### RE: How to reduce thickness in Compress?

What kind of heads are you using that are so much thicker than the shell?

### RE: How to reduce thickness in Compress?

(OP)
TSG4,

I can't change my material. It is specified by the customer. Thanks for the input.

### RE: How to reduce thickness in Compress?

(OP)
Vesselfab,

I tried using F&D head at first then ellipsoidal. Both of them came out to about 6" thick. A tapered head will possibly be the ending to this vessel.

CivilPetro

### RE: How to reduce thickness in Compress?

that's odd

generally a 2:1 ellipsoidal is just a little thinner than the shell, all things being equal.

### RE: How to reduce thickness in Compress?

How about you share some details: OD, pressure, material.  You'll probably get more help that way.

### RE: How to reduce thickness in Compress?

(OP)
OD = 78" Int P = 900 psi Mat'l = SA240 347 T = 970 F

### RE: How to reduce thickness in Compress?

Design Code?  Joint designs?  What type of radiography?  How are you attaching the heads to the cylinder?

I don't use COMPRESS but I did some very quick numbers using ASME VIII, D1 and came up with required thicknesses less than what you gave.

-TJ Orlowski

### RE: How to reduce thickness in Compress?

maybe you can go to hemi heads to reduce thickness

### RE: How to reduce thickness in Compress?

(OP)
At first I used no RT. Then I used Full UW-11a Type 1 for the circumferencial and longitudinal seams. I came up with 3" for both of them. I think that's the thinnest I can make it. Thanks for the input.

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