Hello Hesham, 1) The best way of telling if you need protection is to compute a "No protection" transient analysis. Several of HAMMER's sample models have scenarios like this. They model a pump shut down, as an example, and the transient analysis can be used to determine how severe the transients are and it protection is needed. 2) The following TechNote has a lot of great information on using hydropneumatic tanks in HAMMER, including information on tanks with a bladder: communities.bentley.com/.../modeling-reference-_2D00_-hydropneumatic-tanks 3) Some trial and error may be needed in order to determine the right equipment for a modeling case. You can likely find some manufacturer information to provide some guidance as to the right values to enter. At worst, there is a sample model found in the HAMMER installation folder that has a data for several different types of tanks already entered. While this might not reflect your needs, it can give you a general idea of the types of values the program is looking for. The sample model for the hydropneumatic tank can be found at: C:\Program Files (x86)\Bentley\HAMMER8\Samples\Hydropneumatic_Tank_Example.wtg. Regards, Scott
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