Many times, as stress guy, we come across complicated and long piping layout to be modeled in CAESAR II. These may include parallel pump suction/discharge piping, inlet/outlet piping to/from multiple Coke Drums, outlet piping from two sides of Fired Heaters.

In majority of the cases we found that these parallel paths are either absolutely similar, or mirror to each other, with respect to pipe length, fittings, valves, supports and hangers, and other details.

In case we go for modeling these parallel or similar paths separately, not only it consumes additional man-hour, there is always a chance of human error.

Thus, if we can identify the lines having similar or mirror geometry, we can model once, and make copies as required.

Even in case the paths are similar but not parallel, e.g. discharge lines two groups of pumps, seating orthogonally to each other, we can re-use the portion of model with suitable rotation of duplicated path. Now, we will site the example of a pair of process pump suction lines.

Fig. 1


Now, we need to model another suction branch from Node 50, by duplicating Elements between Node 70 to Node 220.

Now click on ‘List Input’, and select the Elements between Node 70 to Node 220. Then right-click, and select ‘Block Operation’ and then ‘Duplicate’.

Fig. 2

Now, choose the option as ‘Mirror Y-Z’ (this needs to be assessed before-hand). And select ‘Insert Copied Block’ as ‘At End of Input’. Put Node increment as ‘150’, so that Node 80 would be incremented to 230 and so on, and finally Node 220 would be incremented to 370.

Fig. 3

Now, at Row 22, change the ‘To’ Node No. to 50.

Fig. 4

Now, the complete model with Suctions for both Pump A and Pump B are ready for analysis.

Fig. 5

Note: This method would transfer all the elements and properties of first branch, except Node Names and Line Numbers, which the user need to update manually.

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Anirban Datta

A dedicated Piping Engineer, Specializing in Pipe Stress Analysis (Static & Dynamic) for Various Piping Systems of Oil & Gas, Power, and Metal Sector. Proficient in the use of Caesar II and AutoPipe Software.

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