What is the best way to get a total weight of model out of CAESAR II? The "Miscellaneous Data" report lists pipe wgt, insul wgt, fluid wgt, etc. It also lists the total weight of "pipe+insl+refrty+fluid" in the "C.G. Report". However, the sum of all the element weights does not equal the total weight listed in the report. Why isn't the weight of rigid elements included? When I add in the weight of rigid elements (i.e. pipe+insul+fluid+rigidwgt), I get a total weight that is larger than what is listed in the C.G. report. Maybe I have something wrong in the model? Maybe I don't understand how CAESAR II determines the total weight of the system?

Please share with me how you check that the total weight of the model in CAESAR II is correct or at least reasonable.

Thanks.

- ERob

Let me clarify:

When I add up all the weights in the "Miscellaneous Data - Misc. Pipe Report", which includes the weights of pipe, insul., fluid and refractory, I get 32.3 kips. However, the "C.G. Report" reports that the system weighs 41.2 kips including pipe, insul., refractory, & fluid. When I discovered this apparent discrepancy, I realized that the "Misc. Pipe Report" does not appear to include the weights of rigid elements. The total weight of rigid elements is 25.9 kips, which results in a total weight of pipe, insul., fluid, refractory & rigid elements of 25.9 kips + 32.3 kips = 58.2 kips. This total weight doesn't agree with the "C.G. report" either (41.2 kips).

As a another check, I added up all the restraint forces (external reaction forces) in the global-y direction (vertical) and obtained 41.9 kips, which is in close agreement with the "C.G. Report" wgt of 41.2 kips. The difference can probably be explained by imposed forces and deflections.

I know there has to be something simple that I am doing wrong here. Please give me any hints that you can provide. I did not build this model myself, so I need to verify that the weights of the components (e.g. expansion joints, valves, etc.) are correct ... not sure I can do that if I don't understand how CAESAR II adds up the weights of the components.

- ERob

Dear ERob,

Try modelling a simple system and check that CAESAR is calculating properly all the weights.

I just modelled (with CAESAR 6.10) a 13 meters pipe run, 8" Sch 40, 40mm Mineral wool insulation, A106-B, fluid water (Ro=1000Kg/m3). Then the same pipe run deleting 1 pipe meter and adding 1 meter of a 10000N rigid.

I made hand weight calculation for both cases and compared with CAESAR Misc. report and error checker results. I am achieving same results between CAESAR and hand calculations.

Check you are doing proper calcs.

Regards.

Thanks for checking Pablo. I will do the same.

- ERob

Pablo, I did the same check using a simple model. The weight reported in the "C.G. Report" agrees with my hand calc. The table title "CAESAR II MISC. PIPE REPORT 1" in the "Miscellaneous Data" is wrong. It does not report the correct weight of pipe for each element.

- Eric

Eric,

Please open a Suport Request on Smart Support and send in this job. We need to see this.

Will do.

- Eric

I created the SR in Smart Support.

- Eric

I see now that the element weights listed in the Miscellaneous Data Report are actually unit weights (i.e. lb/ft). I’m afraid I jumped to the conclusion that the numbers listed for Pipe WT, Insul WT, Fluid WT, etc. were total weights for each element. The heading of the table clearly states that the weights are in units of lb/ft. I didn’t read the heading carefully enough.

------------------------------------------------------------------------------
CAESAR II MISC. PIPE REPORT 1
FROM TO PIPE WT INSUL WT FLUID WT WT REFCT y minT
TB ALPHA1 TB ALPHA2 TB ALPHA3
/-------WEIGHTS (lb./ft.) -------/ in.
/--THERMAL BOWING EXP(in./in./F)-/
------------------------------------------------------------------------------
10. 20. 18.954 0.000 0.000 0.000 .400 .017
20. 30. 18.954 0.000 0.000 0.000 .400 .017
19. 100. 7.568 0.000 0.000 0.000 .400 .009
------------------------------------------------------------------------------



A list of element weights would be very useful to me. Does anyone know how to generate a list of element weights from CAESAR II so I don't have to do this manually?

- Eric

Eric,

Try: List input --> Rigids

This will show you from-to nodes, individual weight and individual lenght.

Regards.

Pablo,

The Rigid input list is useful in that it lists the lengths and weights of rigid elements, but I don't see a similar list (input list or output list) for pipe elements. I don't even see that I can get a list of pipe element lengths. It seems like this should be basic data that the software presents to the user (e.g. for cross-checking user input).

- Eric

CAESAR II does not produce a report with the data you want. The closest data available is:

1) the Center of Gravity report
2) The "bill of materials" report

Both are available from the Output - Miscellaneous Report.

You will have to make some additional computations - perhaps in Excel to obtain the values you want.

O.k. Thank you.

- Eric