• 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…
  • 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…
  • 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…
  • 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
  • Modelling of VT pumps - in Hammer

    HI, I am working on a project where we need to model Vertical Turbine Pumps in Hammer and carry out surge analysis. When i analyse for surge; suction pipe of VT pump shows negative pressure; how to tackle this negative pressure ? will providing…
  • Hammer - Accurate Modelling of a surge Tank

    Hi I am modelling a hydro power station which features an open surge tank. The surge tank is mostly underground and is 7.0 m in diameter, connecting to the main penstock by a 2.5 m diameter, 9.6 m long steel lined pipe which acts as a throttle. My…
  • Hammer V8i - Hydro Power Pump Turbines

    I am currently learning to use this software with the prospect of using it in future projects with clients. Thus far I have modelled standard turbine installations, however I am curious if it is possible to model pump turbines with this software and if…
  • Water Distribution Modeling Software Survey

    Hello, If you have a few minutes please fill out this short survey to help the Bentley Institute Geospatial team create better training that is more suited to the workflow of our users. http://www.surveygizmo.com/s3/568508/Water-Distribution-Modeling…
  • Old HAMMER Files

    I have some old HAMMER files that were created in November of 2004. I am able to open the .hif files, but the models cannot be run. The first thing that there was an error for was for no pump curve data. Is there a way to access additional data in the…
  • Distribution Sytem Wide Hammer and Transient Analysis of RPZ

    I am attempting to set up a model to demonstrate how a RPZ (Reduced Pressure Principle Backflow Preventer) will respond to Hammer. For those unfamiliar with the operation of an RPZ, I have attached a document which outlines this very well. …
  • Pump start simulation at Hammer v8XM

    I want to simulate a pump start at Bentley Hammer v8XM. Can someone explain to me the whole process. Pump doesnt come with a valve, down at the pipeline I have a GPV that works as a no return valve with varius time steps. I found a post here but…
  • Cla-Val Control Valves in Water Hammer

    Has anyone simulated a Cla-Val surge anticipator (Model 52-03) or surge relief valve (Model 50-01) in Water Hammer? The surge anticipator valve seems straight forward, but I'm not sure what kind of variables to use for time to open, time stays open, or…
  • Hammer Pump Transient Properties

    Is there anyway to make a responsible assumption for the pump transient properties if accurate data is not available? I have a distribution system model that I've been asked to do some transient analysis for. The model has detailed pump curves but I don…
  • Hammer Negative Pressure - Instability at Steady State

    Hello, I am using Hammer V8i. I have a simple layout for a pump station transient model. A pump draws from a wet well, and discharges over a syphon into an effluent conduit. The discharge syphon creates a negative pressure at steady state. My transient…
  • Initial conditions,KNOWN water level in the tank in every time step

    Regards to all. The existing water supply network belongs to III elevation zones of much larger water supply system and ends with the tank of III elevation zone. It is necessary to design new water supply network of IV elevation zone. In the…
  • Hammer: Turbine Instant Load Rejection Modelling

    There is one point regarding turbine modelling which is causing me confusion. The instant load rejection scenario requires the turbine to start at 100% gate, is it possible to start at a lower gate opening, as typically the BEP is not at 100% gate. Or…
  • Control valve response to transient event

    Is there a way to model the response of a control valve to a transient event beyond manually inputting the transient operational pattern? An example would be what happens to a PSV when the transient pressure drops below the pressure set point.
  • Moment of Inertia Turbine Input - Hammer

    Hi I am trouble shooting a Hammer model of a hydro scheme which is producing unexpected results. I have some confusion around which inertia Hammer uses. For hydro generation applications inertia is usually given as WR2 or GD2, with GD2 being four times…
  • Hammer - Modelling vertical pipes

    I am modelling a hydro scheme which features a vertical shaft directly at the intake. So lets says the intake is J1 at elevation 100m and drops to J2 at 50m by a 50 m length of pipe before completing a 90 degree bend to horizontal. Whe using the profile…