Option in COMPRESS 2016

[Mech2325]

Hi all,
Is there any option in COMPRESS 2016 to get seismic and wind reactions in "new (uncorroded)" condition. The software gives reactions in corroded condition of vessel

 

[SnTMan]

Mech2325, not familiar w/ Compress, but in all the software I have used, I have the option to set the corrosion allowance to zero.

Regards,

Mike

The problem with sloppy work is that the supply FAR EXCEEDS the demand

 

[Mech2325]

Well of course i can do it, i was just aksing generally that the software should give the reactions both in corroded and uncorroded state as seismic base shear would be more in case of a new vessel and hence civil foundation design will depend upon it.

 

[SnTMan]

Mech2325, I am not especially familiar with the seismic calculations, so I ask:

Is the base shear greater for a new vessel due to it's increased weight? Is the weight of vessel contents included in these calculations? I theorize that for a lot of vessels, but by no means all, the difference in loaded weight between corroded and uncorroded states is negligible.

Regards,

Mike

The problem with sloppy work is that the supply FAR EXCEEDS the demand

 

[r6155]

In vertical pressure vessel corrosion is not negligible.

Regards
r6155

 

[Mech2325]

Sntman: seismic Base shear is more in case of an uncorroded vessel. What software do you use for the design of a vessel??

 

[SnTMan]

Mech2325, I design shell & tube heat exchangers, mostly horizontal, using primarily RCS and with CodeCalc for what RCS won't do.

As I said, I am not familiar w/ Compress so, a question for you: Is Compress calculating weights in corroded condition only? If so, of what possible interest is that?

Regards,

Mike

The problem with sloppy work is that the supply FAR EXCEEDS the demand

 

[Afox88]

Compress does calculate weight corroded, uncorroded, the hydrotest case and any operating case you want to run with any liquid level and specific gravity. The saddles can be checked in any number of cases. I am very interested as to why it only performs the base shear in the dry corroded state.

 

[Mech2325]

Afrox 88: did u notice the same thing too??
Sntman: COMPRESS calculates weights in both corroded and uncorroded conditions but the seismic base shear in only corroded state which comes out to be less as compared to that in uncorroded state. What if the civil designs it's foundation based on this base shear while the base shear for a new vessel is more than this and is not being accounted for

 

[SnTMan]

Mech2325, I agree that the vessel must be designed for the maximum loading. Why the programmers chose not to do so, I cannot say.

Software is just software. The engineer must know what it does and does not do.

Regards,

Mike

The problem with sloppy work is that the supply FAR EXCEEDS the demand

 

[r6155]

I design with software made by me, checked frecuently by hand calculations. I distrust with other software

Regards
r6155

 

[Afox88]

Mech2325, I did notice the same thing. I was waiting for someone to find a fix on the Compress Forum section, when you posted their originally. I could not find one. It is very odd that this was overseen by Codeware.

 

[Mech2325]

Afox88: yea it seems pretty odd. Guess you just save another file with corrosion allowance set to zero and take out your reactions for a civil foundation loading