VdS-Schadenverhuetung Brandschutz

VdS Calculation Software for CO2, Inert gases, halogenated hydrocarbons Systems

Technical details for you

Optimum design bases on the fluid mechanics equations describing the relationships between technical component data (e.g. pipe diameter, resistance coefficients of the fittings) and the specific material values of the extinguishing agent as well as the physical conditions occurring during flooding (e.g. flow velocity, pressure in the pipes and at the nozzles). Furthermore, balance equations must be fulfilled.

The tools calculate all this precisely according to your specifications at the push of a button - with proven reliability.

Characteristic component values are stored in special catalogue files so they can be adapted anytime for meeting your specific requirements.

(Determining of nozzle and fitting resistance coefficients is, if helpful for you, also offered by the VdS laboratories - if required, please write a short mail to software@vds.de )

Scope of functions

(if a function is only available for certain quenching gases, these are listed in brackets, using the following abbreviations:

  • IG: Inert gases - N2, Ar, IG55, IG541
  • HFC: Per- and partly fluorinated hydrocarbons - HFC227ea, FK-5-1-12 )


Quantity Calculation according to the following Guidelines


  • VdS 2093
  • NFPA 12
  • ISO 6183
  • CEA 4007
  • Free input




Dimensioning of a completely entered pipeline network

  • Pipe diameter, gradations according to catalogue
  • Aperture diameter (IG)
  • Nozzle openings
  • Output of a material list: pipes, fittings, nozzles
  • Graphical representation of the pipe network
  • Calculation of reference values for the oxygen and CO2 concentrations that occur in the flooding area after flooding
  • Determination of a guide value for the required pressure relief opening


Recalculation of a completely entered pipe network

  • System status at operating point (CO2 and HFC)
  • Dynamic flooding (CO2 and IG)
  • Discharge per nozzle
  • Flood time and maximum mass flow
  • Recommended free opening area of the pressure relief opening for a resistance = 2 (IG and HC) or user-defined resistance coefficient (CO2)
  • Composition of the atmosphere in the flooding area after flooding
  • Beam length/mixing length (HC)
  • Evaporation length (FK-5-1-12)


Specification of component, pipe and nozzle data in the corresponding catalog files

  • Resistance coefficients of valve and hose combinations
  • Resistance coefficients of range valves
  • Nozzle coefficients according to the nozzle model from VdS 2380 (IG) / VdS 2381 (HC) / VdS 2093 (CO2)
  • Aperture coefficients according to the aperture model from VdS 2380 (IG)


Nozzles (up to 200 nozzles)

  • Nozzle type (according to nozzle catalogue)
  • Number of nozzle holes for each nozzle (9 for IG and CO2, 99 for HC)


Pipes (up to 450 tube sections)

  • Pipe type (smooth/galvanised/hose/black)
  • Length (0.1 m to 20 m per pipe section)
  • Position of range valves
  • Fittings: bends or elbows


Necessary entries

  • High or low pressure system (CO2)
  • Object protection or room protection (CO2)
  • Course of the pipeline network
  • Flooding time
  • Reservoir
  • Volume
  • Filling pressure at 15°C (IG)
  • Pressure of the nitrogen cushion (HC)
  • Number of containers
  • Storage temperature (CO2: <30,9°C / IG: 50°C / PFC: -10 to +65°C)


Possible entries

  • Specification of pipe diameters for individual or all pipe sections
  • of the number of storage tanks
  • of the diameter of the nozzle openings
  • of the gas output per nozzle for individual or all nozzles
  • of the aperture diameter (IG)
  • of the filling factor of the storage tanks (CO2, HC)
  • Division of the flooding area into up to 21 calculation areas with separate quantity calculation, allocation of nozzles to calculation areas


Tests by the program
(exceeding generates warnings with automated suggestions for action)

  • Maximum difference of transport times to the nozzles < 21% Flooding time (HC)
  • Icing within the flooding period (CO2)
  • Minimum nozzle pressure (HC: 7 bar abs / CO2 HD/ND: 14/10 bar abs / IG: 2 bar abs)
  • Minimum nozzle hole diameter according to Guideline
  • Maximum nozzle hole opening area < 80% connection pipe cross-sectional area
  • Sufficient number of cylinders for calculated application quantity
  • Minimum filling factor of 0.4 kg/litre (HC)
  • Forbidden vertical branches (HFCs for gas content in the pipe > 1%)
  • Maximum distribution at junctions 12.5 : 1 (HFC)
  • Maximum flow velocity in the pipe network (> 80% sound velocity)
  • Minimum flow velocity in the pipe network (laminar flow)


Facilitation + safeguarding: Profit from 115 years of fire protection expertise

We have been certifying extinguishing systems since they were first used in Europe - and are compressing all our knowledge into those renowned tools for optimum effectiveness and efficiency. The programs have greatly facilitated the work of nearly all VdS-approved as well as many other installers of gas extinguishing systems worldwide.



Want to see the advantages for real?

Each program is specially adapted for the gases, system types, etc. you use. Just give us some keywords via software@vds.de

( - which gases? For inert gases: - which type of pressure reduction?
  - Do you already have your suppliers valve + nozzle data?
  - How many users need to access the program parallel?)

, we will then contact you for a free consultation.

  • 1-year license 1.700 EUR (from first program, never from buying date)
  • 3-year license 4.480 EUR
  • 90 days trial 200 EUR, will be credited to full version price


PS: You prefer to use your own software despite all the advantages? We will gladly validate it for your „VdS letter of acceptance“.


Would you like further information?

Our experts will be happy to support you with comprehensive advice and assistance: