Comments, Questions, and Answers on this modeling approach in AutoPIPE

Item #1:

• Modeling Mechanical Oscillating Vibrations in AutoPIPE

item #2:

On the rotating dialog screen what is meant by Reference point and Dx, Dy, Dz values?

Answer:

From the online help:

Specify the global offset values DX, DY, and DZ from the reference point to define the location of the center point of the pump. Since AutoPIPE cannot display a point for the center of the pump, the pump center is defined relative to the suction nozzle or discharge nozzle.

Example: ANSI 4x3 (A40)

 Item #3:

I have introduced a pump at the delivery point , but I cannot see nor numerically or graphically that effectively the pump is inserted (sent you the return model, in this case there is no pump)

Answer:

Correct, there is no Pump / Compressor equipment element to be displayed in the AutoPIPE model. The Rotating Equipment module performs additional calculations on the the piping geometry and loads already modeled and provided the results of these extra calculations in the output report. 

Again, no Pump / Compressor element will be displayed in the model. 

Item #4:

How do we check the pipe loads on pump Suction & Discharge piping?

Answer:

First we should model the Hot Pump as RIGID Pipe (shown as purple in image below) which Heats up and Expands

We can use either Reference points and/or User equipment to check the pump loads

Reference Points are Defined at the Suction & Discharge nozzles

In this example we have a special manufacturer pump with allowable loads defined in User Rotating equipment

The rotating equipment report checks all load combinations and reports nozzle loads. In this example the loads exceed the recommended allowables and FAIL is placed to the right of failed value in the report, as indicated in red below. 

See Also

Modeling Approaches

Bentley AutoPIPE