Dear Bentley Team,
I have to provide Bladder Surge Tank due to pump trip. I have developed my model and provide Hydroneumatic Tank. I am still getting vapors pockets in my system, not sure about the result. I would really appreciate if someone review my model and give suggestion for improving results.
Thanks & Regards,
Syed
Hello Syed,
Could you please mention, what notifications do you receive after computing the error? Is tank becoming empty during transient simulation? You will need to make sure the tank doesn't become fully empty.
Hydropneumatic tank user notifications: "gas volume exceeds volume of tank" or "fills its containing tank"
Please elaborate your query, you can upload model files if required. Sharing model files.
Here is modeling reference.
Modeling Reference - Hydropneumatic Tanks
Regards,
Sushma Choure
Bentley Technical Suppport
Dear Sushma,
Thanks for reply. I have uploaded my model for your review.
There are a couple things you will want to look into. First, there is a user notification about the bladder filling the hydropneumatic tank. This indicates that the tank may be empty and not able to provide protection. See the link Sushma provided for more information on this message and adjustments you can make to the hydropneumatic tank properties to help with this.
Another possible reason is the placement of the hydropneumatic tank. They hydropneumatic tank is about 3000 meters from the pump. So after the pump shuts down, the downsurge caused by this would travel this distance before the tank could react to this. You will notice that there are not negative pressures downstream of the tank. The best way to see this is by looking at the profile animation in the Transient Results Viewer.
It is possible that by placing the hydropneumatic tank close to the pump, it will be able to help with the negative pressures between the pump and the tank. You may want to test a case like this to see how the system reacts.
Scott
Dear Scott,
Thanks for suggestion. I will work on above mentioned points