• 水锤

    在计算水泵突然停电停泵水锤过程中,采用空气阀对管道负压进行消除,能够基本消除管道负压,但是水泵出口处一直处于负压状态,如何消除水泵出口负压?突然断电后的水泵停泵水锤,水泵出口处产生负压与哪些因素有关系? 20230626.rar
  • Valves

    I have to add valves in my rising mains network, but none of the valves in my network seem to match the valve options given in my water hammer software, can you help me with that? Please let me know which valves (in software) can be used for the valves…
  • Control philosophy of fire pump

    How to give control philosophy with set point for fire pump in water hammer ? P ease elaborate. Thank you
  • how to find wall thickness and class of Galvanised iron pipe?

    can i find wall thickness in watergems or i have to take the help of hammer. how to design the pipe for particular grade( like mserw grades (grade a or grade b or X42)) or class (like Gallvanised iron (light , medium and heavy class) in watergems…
  • Hammer results File doesn't contain any transient extended node.

    Hi, I am new to Bentley Hammer. I am analyzing a Gravity pipeline where water will run from 1619 m elevation to 1400 m elevation in a hilly area with ups and downs. When I check " Transient Results Viewer" it gives a dialogue box. "The hammer results…
  • Water Hammer Negative Pressure Issue

    Bear Bentley Users, During transient events, I am facing negative pressure at high points. I am using double-acting ARV, Vaccum breaker, along with check valves. But still unable to eliminate the negative pressure. I want to eliminate this without using…
  • Problem in create different senario in water hammer

    Hi, I have to do surge analysis for two different scenarios(demand). I am keeping flow control valve at the inlet of each OHT and in this network there are six pumps working. Please tell me how can I create two diffrent scenarios in that flow parameter…
  • Surge Analysis

    - I can manage to have low capacity surge tank with negative minimum pressure in the tank. Is it possible to select surge tank of bladder type with minimum negative pressure in the tank (or with pre-charged head negative).Is it possible to select surge…
  • Open operation (One Pump running and second pump starts 60 sec delay)

    Dear Team, I have a scenario, in which one pump is running and seconds pumps start 60 sec later. I have not considered the pump tripping and i need know will there be any pressure variation during the starting of second pump. When i run the analysis…
  • pump isolation valve

    Hello, I have a case in which I want to model a pump isolation valve? what types of valves Can I use ? can I use FCV instead of isolation valve to model this configuration?
  • isolation valve position

    Hello, How could I locate an isolation valve at a specific position on a pipe with a schematic drawing? Can an isolation valve replaced by another type of valves in watergems to do the same task?
  • area change modeling

    Hello, how could I model area change in bentley hammer ? Is there any method rather than splitting pipe? does pipe splitting do better simulation for Wave Reflection and Transmission at an expansion and a contraction?
  • Transient Analysis without Air valve & only with Surge Vessel (in WaterHAMMER)

    Hello, I have done transient analysis for 3 cases: 1. Without Protection - No Air valves considered in the Pipe line 2. With Air Valves - Air valves provided based on pipeline profile 3. With Surge Vessel & Air Valve - Surge vessel (sized based…
  • Modeling one way surge tank in a existing pumping station

    I have modeled a surge tank like one way ussing choosing "false" for "treat as junction?" and "true" for "has check valve" in an existing pumping station and computing a transient simulation (pump shut down after 5 seconds), but, when i check the the…
  • Surge study for sewage transmission line

    Hello i would like to study a surge effect in sewage transmission line consist from lefting station of 1 submarsible pump .. water will be pumped by the submarsble pump for 1.5 km to a manhole . how can i model that submarsable pump in water hammer…
  • Getting reliable results from Bentley Hammer

    Hi, I am modelling a simple system to compare the results to some codes that I have. But, despite having all the configurations similar to codes, I cannot get similar pressure fluctuation. Could you please have a look and let me know the reason? …
  • How to model discharge to atmosphere point

    HI, I'm working on my college project (The project is a plumbing system to drain a 1-m3 tank in the shortest time ). I use the discharge to atmosphere element at the end of the project but I'm really confused with this element's input data like [Flow…
  • outflow of pumps or reservoirs in model is unequal from reality

    Hi I have encountered some times this problem. I have a flow in the existence pipe of a reservoir or pump in model. I know the demand consumes in the network and use that in junctions. I have measured the outflow with a portable flowmeter or a fixed…
  • Can we perform hammer for loop networks

    Hi Is to possible to model water hammer analysis for water distribution network with junctions only and and water source is one reservoir and one pump? And if we can model it what is the steps? Regards Sayed Elhagar
  • Surge Protection of Water Transmission line

    Hi, After Modeling and design and installation of transient protection devices; let's say the hydropneumatic tank installed. How to do the commissioning ? is there any manual/procedure for the commissioning? Thank you,
  • Penstock for 4 turbines

    Hi. I have a problem with a simulation of a 920 meters penstock which feeds four pelton turbines (2 with 0.9 m3/s and 2 with 1.1 m3/s) in my model the pressure of the penstock´s end is 686.92 m H2O and in previous calculations this value should be 258…
  • Water hammer

    Dear Bentley; Can I make water hammer analysis for a distribution network which has no tanks or reservoirs (it has junctions only with fixed demand) after the pump station. in case of yes we can do it using Bentley hammer, is there any difference between…
  • Water Hammer warning message

    Dear Bentley: I am doing hammer analysis for sanitary forcemain and I sugessted hydropneumatic tank for protection, but I got the following warning message 48117 "With Surge Protection" "Hydropneumatic Tank" "263" "HT-1" 0.000 "The maximum and minimum…
  • pump power failure

    Dears , I am modelling a 2 km pvc line of 1600 mm diameter. the static head is only 4 m & the total head is 18 m. when i model the event of pumps shut down , the flow is only reducer through the pumps & cut off after over than 80 seconds whatever the…
  • General Transient Modeling Help

    Does anyone have a good resource for learning and understanding real world transient problems and models? I'm fairly new to transient analyses but I have been through the Bentley training course. I have a couple transient models that I am currently working…