How about increasing the valve closure time?
Increasing valve closure time will certainly help against water hammer. This of course is also possible to simulate in BOSfluids.
Why the diesel fluid properties is not listed there? For surge vessels, there is no option for cubic or rectangular shapes, correct?
Diesel can be used. Any kind of fluid (gas or liquid) can be defined and used in the software. Also you can create your own database with fluid definitions. You will only have to specify the fluid once and reuse it in other projects.
For surge vessels, there is no option for cubic or rectangular shapes, correct?
Surge vessels are visually shown as cylinders, but rectangular shapes can be simulated as well.
When we import the file into CII, do we need to run dynamic or static analysis? The forces in time-dependent and static scenarios are very difficult to analyze.
The flow induced forces are dynamic, so in CII you would use them to perform a dynamic stress analysis. BOSfluids makes it easy to perform a dynamic analysis in CAESAR II as the input file for the CAESAR II can be automatically generated.
Can you compare BOSfluids vs. CII spectrum analysis?
The BOSfluids forces can also be loaded in CAESAR II to perform a spectrum analysis, you find a dedicated BOSfluids button in CAESAR II.
Is surge analysis required for closed loop piping network which has multiple branches in the piping network ?
Yes, any fluid flow network can be susceptible for surge.
For a closed network, how should the boundary conditions be specified?
BOSfluids has a dedicated boundary condition you can use for specifying the pressure in closed loop networks.
Can BOSfluids simulate gases, or is it limited to liquids only?
Both gas and liquid flow can be simulated.
Can BOSfluids estimate slug flow, slug volume, etc.?
Full two-phase flow analysis is not possible in BOSfluids. Two-phase flow is restricted to cavitation, flooding and draining op piping, surge vessels and air valves.
When performing surge analysis, we don’t have speed data. How should we proceed?
If not all pump data is available, typical values may be used. Important is that the flow rate and pressure gain are correct.
Could you please show how to simulate heat exchangers?
Although not in this presentation, BOSfluids can be used to simulate the flow through heat exchangers and also tube rupture events can be simulated.
Is this software applicable for steam calculations?
Yes BOSfluids can be used (and has been used) for simulating steam. But note that no two-phase flow like stratified flow can be simulated.
Can we import a CAESAR II model into BOSfluids?
Yes, you can both import CAESAR II models into BOSfluids or export BOSfluids models to Caesar. Having the same model in both applications makes it easy to use the forces calculated by BOSfluids in a Caesar II dynamic stress analysis.
Can BOSfluids simulate rupture disc or Pressure Relief Valves reactions?
BOSfluids can simulate rupture disk and pressure relief valves.
Is it possible to import a large model all at once, or does it need to be divided into stages?
Yes, you can import a huge model and there’s no such restrictions so far, we can import multiple PCF files and you can generate the model in very short time.
What kinds of input data do I needs a check valves component?
In BOSfluids you can choose multiple kinds of check valves. Depending on the desired behavior and the information available you can select an operation mode. Of course it is useful to have more detailed information on the check valve, but it is not uncommon that this information is missing and default/typical values are used.
Is this software internationally accepted?
Yes, BOSfluids is used globally by many (large) companies in various industries
How do we decide which cases should be simulated, such as pump start/trip, pump discharge valve closure, etc.? How do we determine which scenario could be the governing one?
Creating various kind of cases and running them in BOSfluids is very fast, so you can include many scenarios. The post-processing features lets you easily identify which case is the most severe.
Does piping geometry and routing affect the results?
Yes, the geometry may definitely affect the results.
If we import the model into CAESAR II, will it automatically adjust all scenarios in terms of temperature cases, or do we need to make modifications? For example, in a firewater piping circuit, the model might analyze one scenario with all valves open, while in another scenario, some valves might be closed. The same applies to pump cases (standby vs. operating).
Each scenario in BOSfluids can be easily exported to Caesar II. In Caesar you can combine the different dynamic load cases with multiple static load cases (different temperature etc.).
What effects can be expected after the valve?
Upstream of a closing valve the pressure increases and downstream the pressure decreases (possible cavitation).
How far will the effect of the surge propagate in a 30 km water supply network?
A pressure surge wave can easily travel of 30 km especially when it is one long pipe line.
Can we calculate transient forces generated due to sudden valve opening or disc rupturing during a pipe air-blowing event using BOSfluids?
Yes, these events can be simulated.
What are the speed limits of steam in the pipe for BOSfluids modeling of hammer effects?
BOSfluids does not impose any limitations on fluid velocity. However note that for very large velocities (>300 m/s), some assumptions may not be valid. For typical simulations this is not a problem. The dedicated elements like safety valves include effects like choked flow which are typical for gasses.
Will the piping and fitting stress information available to provide piping team?
BOSfluids is designed primarily as a transient–flow (water-hammer) and hydraulic analysis tool, not as a full-fledged piping‐stress solver. However, it does generate all of the pressure, force and moment data your piping‐stress engineers will need to perform their mechanical calculations.
Is surge analysis required for closed loop piping network which has multiple branches in the piping network ?
Yes, any fluid flow network can be susceptible for surge.
Even if the network has multiple branches where energy/flow can be diverted, thereby mitigating the surge during scenarios like pump stops or valve closures?
No you don’t need that, you can model directly in BOSfluids and perform the steady state analysis or transient analysis, and BOSfluids will provide a native file which can be directly imported in CAESAR II if required to perform any further analysis.
Do you necessarily need CAESAR II to use BOSfluids?
No, CAESAR II is not required, BOSfluids also has interfaces with various other stress packages.
If you choose to use BOSFluids, do you also get a manual?
Yes, a manual is available when you install the application.
Is it possible to model the method of fastening on the pipe system itself (not the construction) without using ANSYS? or example, can you specify that at location "x," there is a fastening?
Yes, you can model the any kind of pipe restraint. This is not related to Ansys. Restraints can also be exported/imported to and from CAESAR II for example.
Can you model different flow rates as boundary conditions at different outputs?
You can have many flow boundary conditions in your model.
Have you encountered water hammer caused by ESP pumps?
Yes failure of an ESP pump may lead to water hammer.
What kind of stresses in the pipe wall are caused by surge pressure?
All kind of pipe stresses can occur. The pressure causes hoop and axial stresses. But since the forces may displace pipe lines axially also bending stresses can occur in the system.
Apart from water hammer analysis, what other types of analysis are possible in BOSfluids?
BOSfluids has a transient flow solver, a steady state flow solver and a quasi steady flow solver. These can be used for water hammer (surge analysis), but also for flooding and draining a system and line sizing for process flow.
Can a pump (e.g., shutdown or failure) be used to simulate transient events in pipelines with BOSfluids?
Yes, BOSfluids can simulate pump trip/failure.
In cases of cavitation or vapor cavity formation, can BOSfluids detect and localize it?
Yes, BOSfluids not only simulates the formation and collapse of vapor cavities, it also lets you pinpoint exactly where and when they occur in your model.
In the event of an anomaly (such as leakage, blockage, or burst) along the pipeline, can BOSfluids detect it?
No, but you can setup a scenario via boundary conditions or other model parameters to study the effect of such phenomena.
Does BOSfluids consider unsteady friction during analysis? If yes, which unsteady friction model is used?
No, BOSfluids does not consider unsteady friction.
