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Which version of Fathom are you using? In my version, I run each scenario individually after selecting it in the scenario manager. Each child scenario shares the same characteristics of the parent scenario, except those that are explicitly changed. Regards.

@dhengr Thanks for your comments. I'll check with the civil guys the proposed option and I'll investigate further about air bags as caps, it seems like a really good idea for my application. The expression that you commented is related to the option of connecting the bottom of the two...

You have to work backward from your requirement. You have a point where you have a requirement of xx l/s @ yy bar (only stating flow is incomplete information). If you are supplying to a sprinkler, an orifice, a heat exchanger, or a hose, pressure is linked to flow. Then you have to add losses...

You are right, there is conservation of mass upstream and downstream of the CV. What enters a pipe must be the same that goes out of it.

Sorry, now I think that I misunderstood your doubt. Every time you change a parameter (like throttling up or down a valve) you'll be in transient state until you reach steady state (that is the situation that is calculated by EPANET). The system will stay there until a parameter change. If...

Hi anber, Could you explain how does the system demand changes from start-up to normal operation? I understand that you have a pump feeding a manifold and there are many pipes branching out. Do you know the system curve of each branch? If it is more than 3 branches, you could alleviate some...

@bimr Thanks for commenting. My design intent is in providing a way to start the siphon in any direction even when the water level in the fuller pond is at 2-meter. For the existing reservoir, my issue is in finding a way to operate the valve from the surface, as the valve isn't near a...

@LittleInch Thanks for your answers. The civil engineer does not have information about the earth dam or the geomembrane and doesn't feel safe about modifying them. The client has a really small window to empty the reservoir of 5-days a year and we haven't found a construction process that...

Thank you all for your comments. @pennpiper I was proposing 40-inch butterfly valves, but I have found really high torques for opening unbalanced valves. Now, I'm planning on replacing those with at most 20-inch valve and request a datasheet with low torque. My issue with the long stem is that...

Hi, I'd like some opinions about guaranteeing easiness of operation of a siphon connecting two ponds. The installation is at sea level for irrigation, the configuration is: - there is an existing pond of 600,000-cubic-meters of water capacity and 8-meters of water depth. This existing pond...

Excellent material!!

@EnergyProfessional Thanks for the input. I've been having a really difficult time getting information from my local dealers of Arctic, Smartd, and Daikin Chillers. They do not seem to be able to obtain a data sheet with vibration data from their headquarters, and my vibration isolation...

Hi, everyone. I'm looking into the requirements that I should make to the structural engineer for the installation of a magnetic chiller in a roof. After looking into thread507-299291 I'm understanding that if he provides a 6'' maintenance slab and I specify that the equipment is provided with...

@cdafd Actually, we are designing a new terminal for an existing airport. The current fire system is approved for the existent terminal, control tower, hangars and maintenance workshops; that system has its separate water storage and pumping system. For the moment, I'm opting into proposing a...

@TravisMack I believe that you are right. I've designed systems for buildings and shopping centers according to NFPA 13 and 14 as you describe. But what confuses me is the private hydrants that are required by "NFPA 415 2.5.3: Fire hydrants shall be provided on both the ramp and street sides...

Hi, @cdafd Fire water is stored in an exclusive tank, an next to it there is a fire water pumping station.

Good day, community: I'm part of a team that is designing a fire-protection system for an airport terminal building. Other parts of the fire-protection system (like hangars and maintenance workshops) are being taken care of by an independent system. We are having issues in defining if it is...

Hi pocketengineer, Thanks for your comment about what is usual practice for HVAC in chiller plant. I'll see into replacing the AHU for fans if I can justify that the only items that release heat are the motors. Regards.

Hi ZDR1985, The room is around 150 meter2 (around 1600 sq. ft.) Thanks for pointing out to the 95% electrical efficiencies from the motor, I didn't take that into account. For the pump, I was referring to a hydraulic-and-mechanical efficiency of 80% and that what is left turns into heat to the...

Good evening, community: I'm reviewing the HVAC design of a chiller plant in the basement of a 30-floor building. The main equipment present in this room are: - Chiller / 360 ton / 351 kW (x3 units) - Primary loop pump / 1512 GPM @ 60 ft w.c. / 30HP (x4 units) - Secondary loop pump / 2268 GPM...