Hydraulic Analysis of Fire Sprinkler and Hydrant Systems


The Main Screen of HYENA

The ACADS-BSG computer program HYENA can be used to analyse automatic fire sprinkler systems with a simple end, side or centre fed configuration or more complicated looped and gridded systems. It may also be used to analyse fire hydrant and hose reel installations or combined sprinkler, hydrant and/or hose reel systems or any other systems where the discharges can be represented by a k factor and minimum flow.

With a given sized network the program performs a complete hydraulic analysis determining the water flow in, and pressure drop though, each pipe in the entered network taking account of all fittings entered by the user.

The main features of the program are:-

  • The program is capable of analysing looped and gridded systems as well as the more conventional tree configurations.
  • The program can be used to carry out a sprinkler system analysis in accordance with NFPA, NZ4541, AS2118 or SSPC52 or to carry out an analysis of hydrant systems with or without hoses or hose reels
  • The piping system can have up to 10 input points and `these can be modelled as a fixed pressure, a town mains water supply or a pump
  • The program can work in a wide range of units including Metric and British or US and uses the Hazen-Williams formula for the hydraulic analysis.
  • The program operates under WINDOWS and all input data is via a series of screens with numerous features including drop down lists, selection lists, various sort options, etc; to facilitate easy data input.
  • All nodes that are not nominated as discharges, or input points are automatically assigned as reference nodes to save input, the user only having to assign elevations.
  • Piping materials complying with a wide range of codes are catered for including light medium and heavy steel, cast ductile iron, and copper piping to Australian or New Zealand Standards, and API piping codes, selected from a drop down list.
  • When pipe sizes are entered as nominal sizes the program determines the actual I.D. from data stored in the program for the different pipe materials. The user can however add to this list by entering their own pipe materials and associated internal diameters.
  • On the Pipes entry screen, columns can be sorted in ascending or descending order, particular pipes or nodes can be found, and a global change check box allows global changing of pipe diameters or lengths

The Pipes Data Entry Screen

  • A wide range of fittings are provided for with equivalent lengths stored in the program. A facility is also provided for users to add to this with their own fittings and associated equivalent lengths or to modify specific fittings by entry of alternative equivalent lengths.
  • Booster pumps can be located anywhere in the network. Back flow preventers can also be included and check valves can be made to restrict flow to one direction in a given pip

The Fitting Selection Screen


A Grid with two Main Pipes, Ten Range Pipes and 14 Operating Sprinklers

  • The program can be used to determine the design point (required flow and head at the input point) given the k factor and minimum discharge of each sprinkler head or hose reel. Alternatively a pump or water supply characteristic, or a fixed pressure can be entered for one or a number of input points, and the program then determines the water flow from the discharging heads or nozzles and the operating point on the entered water supply or pump flow characteristic curve(s)
  • Provision is made for gridded layouts to be entered easily. This grid can contain one, two or three main pipes with range pipes between and branches to the left or right as required. Any number and arrangement of sprinklers on the grid can be made operational and the program can find the least favourable position of these operating heads across the grid if requested. Nodes and pipes are automatically numbered when the grid facility is used and various options are available for quickly
  • A graphical display of the grid is provided and on this the user can elect to display pipe numbers, node numbers, pipe diameters or lengths.
  • In a Grid, sprinkler elevations can be fixed at a given height, entered individually across a grid row or entered as a single slope or pitched slope across the grid row. These can be used in combination and row elevation are automatically duplicated in subsequent rows up the grid until the next row elevation specification.
  • The grid commands can be converted into the longhand detailed individual pipe and sprinkler specification thereby enabling modifications to be made to the basic grid.
  • Range checks are carried out on all input items as they are entered and rigorous cross checks and other checks are made with a validation button that is red when there are errors and green when there are no errors.

Setting the Elevation for a Gridded System with Rising Main Pipes.


Selecting the Operating Sprinklers in a Gridded System by Windowing the Required Heads

  • The calculations use a process of matrix inversion to solve the differential equations for each loop in the system and this method is not only very fast but also very reliable allowing very large systems to be analysed.
  • The results include a Summary of the flows and pressures for all discharges and for all input points. This is followed by a detailed table of Pipe information including the total equivalent length, pressure drop, etc., for every pipe in the system and a detailed table of Node information. This includes the pressure at each node and the flow if the node is a discharge or input point. The total volume of the piping system in litres is also calculated.
  • For design estimating purposes the program can also determine quantities in the system including pipe lengths and numbers of fittings categorised by pipe material type and diameter.

The Summary Results

Stay informed

Keep up with ACADS – BSG’s latest news. Subscribe below or follow us on LinkedIn.

Website Subscription Form

It has always been a pleasure dealing with ACADS-BSG team due to their helpful nature and quick response time to any inquiries and technical issues. Camel\Hyena works out of the box and install time is in seconds, I cannot recommend any other company that provides better customer service other than Catherine and her team.

– Marvin D

Catherine and the team at ACADS provide customer service of the highest standards always offering the best solutions for our business with fast response times. I would highly recommend ACADS-BSG.

– Amy

The ACADS BSG suite of software has been used by VOS Group for 30 years. We as a company have grown as the software capabilities have changed with usability and technology. The support from head office has always been quick and accurate, with a resolve to overcome any obstacles. We have always found the outputs to be accurate and reliable and a good basis for good engineering design.

– Shayne C

Moving to a cloud based platform has improved the overall performance of the software. [being able to log in from any device] has improved my overall productivity as I only need to carry my smart phone or a tablet, and I can do my job remotely. Tools and functions are clearly organised within the new interface reducing any confusion for a new user. Copy+ Paste option saves a lot of time for Engineers like me. It just works like an Excel Sheet, where you can copy items and paste them somewhere else. It saves a lot of time especially if you are working on a single project and you want to do multiple calculations.

[HYENA+] allows me to quickly switch from one calculation to another without losing any data. This has reduced the overall lead time in doing calculations. I am sure [HYENA+] will have a positive impact on the Fire Industry.

– Ahkil M


If you wish to receive our latest news in your email box, just subscribe to our newsletter. We won’t spam you, we promise!

[contact-form-7 id=”2639″ title=”Newsletter footer form”]

As the pioneer of the lean startup movement, APPLAUZ has dedicated it’s time to sharing effective business strategies that help new businesses and enterpreneurs put their money to work in the right way.


If you wish to receive our latest news in your email box, just subscribe to our newsletter. We won’t spam you, we promise!

[contact-form-7 id=”2639″ title=”Newsletter footer form”]

As the pioneer of the lean startup movement, APPLAUZ has dedicated it’s time to sharing effective business strategies that help new businesses and enterpreneurs put their money to work in the right way.