Notes

Related Topics

Notes can be found by code number.

Code

Warning

Cause and Solution

W697

W539

W697 - Iterations didn't converge (R>0)

W539 - Iterations didn't converge (D>0 and R<0)

Simultaneous iterations for friction and single-directional restraints didn't converge.

1. Switch the iteration mode to "mode 1-5" in Project Settings. Usually it helps with this king of issue

2. Check gaps in the model. It is incorrect to add mounting tolerances, used to facilitate installation, as gaps into piping model. Usually there are a lot of such gaps (in each support) and they are very small (1-3 mm). If such gaps are specified in the model the serious problems with iteration convergence may occur. Please remove such small gaps from the model.

It is needed to specify only big structural gaps, that are controlled during installation. For example the limit stops, anti-seismic stops etc. Usually such gaps are big (>5 mm) and their number is few.

3. Iterations might not converge due to loss of accuracy. Try to insert markers

4. If restraint reaction is small relative to other loads (lower than 10%) you can ignore this message

5. Try to set friction factor = 0 for specified restraint

6. Remove specified support from the model. After that check the displacement in the node without support. If displacement is in allowed direction or in disallowed direction, but very small (lower than 5mm) then you got the almost right solution. If displacements is higher, but stress check and restraint loads check is OK then you can analyze the model without this support because the system with this support will work better.

7. Slightly change the model: pressure, temperature, support placing etc. Sometimes the small changes of the model can lead to successful convergence of iterations

8. Try to set friction factor = 0 for all supports

9. If failed, please send the START-PROF project file to technical support

 

W697 - (R>0) reaction in restricted direction. For example the up reaction direction in resting support

W539 - (D>0 and R<0) displacement in allowed direction, but reaction in the same direction

D - displacement along the allowed direction, R - reaction along the allowed direction

W541

W693

W694

W696

W542

W541 - Solution integrity check failed (D<0)

W104 - Solution integrity check failed (D!=0)

W693 - Solution integrity check failed (|D/k-Z-R| < 0)

W694 - Solution integrity check failed (D>DD)

W696 - Displacement vector and friction force vector are not parallel

W542 - Solution is not obtained (problem x)

Deformation check failed. The solution lost accuracy. Results are not accurate.

1. Switch the iteration mode to "mode 1-5" in Project Settings. Usually it doesn't help for such type of issue, but should try firstly

2. Try to insert markers. Usually it helps with this king of issue

3. Check if the system is geometrically nonlinear and fix it

4. Try to split the big mode into several smaller ones through fixed anchors. See Independent Piping Segments

5. Do the recommendations for W697 and W539

6. If failed, please send the START-PROF project file to technical support

 

W541 - (D<0) displacement in restricted direction of single-directional restraint

W104 - (D!=0) displacement in double-acting restraint is not zero

W693 - (|D/k-Z-R| < 0) spring deformation check failed

W694 - (D>DD)  displacement is greater than the gap value

W696 - Displacement vector and friction force vector are not parallel

W542 - (problem x) this project file must be sent to technical support

D - displacement along the allowed direction, R - reaction along the allowed direction, k - flexibility, Z - precompression force, DD - gap

W815

Solution integrity check failed  (Fric!=Kfric*R)

Friction force not equal to friction factor multiplied by reaction force. It is recommended to send piping model file to developers

W416

Reducer should be inserted in diameter change node

A reducer should be inserted in a node connecting two elements with different diameters

W582

W583

Restriction on force along axis/moment has been violated

Support load exceeds maximum allowable value input in  support properties

W632

Allowable restraint subsidence considered

A special trick for increasing iteration converge for single-directional restraints is used - support subsidence by a small value. This message is for information only and need not be acted upon

W305

Piping is lifted above the support

A single-directional restraint in a support has been disabled and is not considered in the analysis (does not take pipe weight).

This is only a warning and does not indicate any code restriction violation. This means that pipe moves in upward direction off of the support. If lifting happened in all operation modes, then it means that this support is not needed and can be removed. If lifting happened only in hot state, then pipe will lie back on the support in cold state. The potential problems may happen are: vibration caused by increased flexibility, big horizontal displacements caused by seismic inertial forces, wind, etc. Engineer should take decision based on his experience or on company rules.

W670

Hanger rod rotation angle exceed allowable

The allowable values are specified in Project Settings. By default for Russian codes is 5 degrees, for Chinese codes 3 degrees for rigid rod hangers and 4 degrees for variable spring hangers (D-ZD2010 code). To avoid this rod length can be increased