Operating Parameters

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Operating Parameters

The necessary operating parameters for hydraulic selection have to be specified in the table.

 

Hinweis

The program allows for defining several duty points for single head pumps. In that case, the Operating data and Medium data sections receive the corresponding number of columns, where you can define specific operating parameters for each individual duty point. To add a duty point, use the button above the Rated duty point combo box. Use the combo box to define the duty point, which will be the reference point for the pump selection. The configuration of the pumps in the selection will be carried out on the basis of the parameters defined for this point.

 

The parameter list is available in a simple and in an extended view. Both are divided into different sections to illustrate the character of the respective parameters.

 

Hinweis

In both variants, the mandatory values are marked with the Stern symbol. Default values are displayed in blue, but can be changed at any time.

 

Simple view

 

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The simple view contains only the values that are absolutely necessary for the hydraulic selection.

 

Extended view

 

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In addition to the necessary parameters, the extended view contains certain technical values and limit values that can be used to make the selection more precise.

 

The complete parameter list includes:

 

Kind of Circuit:

 

Spaix ParallelPumping add-on module: This module calculates pump performance curves for parallel circuits of the same or different pumps.

 

Nature of system: The nature of system determines whether a single head pump or multi-pump system is to be used. Depending on the type of pumps, the following options may be available:

 

Single head pump

Several (single) pumps in series

Several (single) pumps as parallel circuit

Several different pumps as parallel circuit

Booster set

Twin pump main peak

Twin pump main standby

 

No. of pumps: For multi-pump systems (series, parallel and pressure boosting), specify the number of pumps in the system here.

 

Hinweis

This parameter is only available for multi-pump systems.

 

Type of reserve pump: This field allows you to specify the type of a reserve pump for multi-pump systems (series, parallel and pressure boosting). The following options are available:

 

Reserve pump (as failure redundancy)

Reserve pump for peak load

 

Hinweis

This parameter is only available for multi-pump systems.

 

Operating data:

 

Duty point name: This field contains the name of the operating point. It can be changed at any time by entering the new name directly into the field. The program uses A1 as a default name for the first duty point. For each further duty point, the number is increased by 1, thus A2, A3 etc.

Flow / Mass flow: Flow and mass flow are complementary, i.e. one value is calculated by specifying the other. If the Show calculated lines option has been activated in the upper area, both values will be displayed. If the option is inactive, the complementary value will be hidden.

Head / Pump pressure: Head and pump pressure are complementary, i.e. one value is calculated by specifying the other. If the Show calculated lines option has been activated in the upper area, both values will be displayed. If the option is inactive, the complementary value will be hidden.

Total static head: The total static head indicates the head difference between the inlet of the suction pipe and the pump inlet. This value can be set in this field.

Available system NPSH: This field can be used to define value for NPSH, which is to apply to the entire system. This value does not have to be the same as the NPSH value of the pump.

Test norm: During the product search, the program checks whether the desired test norm is available for the product. If so, the curve is calculated with the given devaluation. If the desired test norm is not available for the product, the standard test norm of the product is used. The actual test norm to which the performance curve then refers is shown below the diagram.

SPAIX NfpaSizer add-on module: Extension for the selection of fire extinguishing systems according to NFPA20.

SPAIX TestnormConverter add-on module: Conversion of pump performance curves to a different acceptance tolerance.

Inlet pressure head / Inlet pressure: Inlet pressure head and inlet pressure are complementary, i.e. one value is calculated by specifying the other.

Inlet pressure (pin):

Automatic adaptation to the duty point: This parameter defines whether and in which form a curve is to be adapted to the specified duty point. Depending on the adaptation options possible for the respective pump series, you can select the corresponding adaptation via the Listenauswahl button.

 

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The option set by default is According to manufacturer's specifications. It performs an adaptation as specified in the database program.

The Impeller trimming, if applicable option automatically performs a corresponding impeller adaptation for the resulting selection, if it is provided for the pump(s).

The VFD speed regulation, if applicable option first performs a speed adjustment, if provided. Then the program checks whether a frequency controller (VFD) is assigned. If so, it is selected and the corresponding VFD curves are generated.

 

Beispiel

Example: Curve diagram with selected frequency controller (increment = 0).

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Beispiel

Example: Curve diagram with selected frequency controller (increment = 5Hz).

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Medium data:

 

hmtoggle_plus1Fluid:
hmtoggle_plus1Temperature:
hmtoggle_plus1Density:
hmtoggle_plus1Specific gravity:
hmtoggle_plus1Viscosity:
hmtoggle_plus1Dynamic viscosity:
hmtoggle_plus1Vapour pressure:
hmtoggle_plus1pH value:
hmtoggle_plus1Content of solid:

 

Search area:

 

hmtoggle_plus1ΔH + / ΔH -:
hmtoggle_plus1ΔQ + / ΔQ -:

 

Advanced selection:

 

hmtoggle_plus1Q/Qopt - / Q/Qopt +:
hmtoggle_plus1Max. impeller trim:
hmtoggle_plus1η/ηmax:
hmtoggle_plus1Rated power to be considered for motor selection:

 

Ambient conditions:

 

hmtoggle_plus1No. starts per hour:
hmtoggle_plus1Ambient temperature:
hmtoggle_plus1Altitude above sea level:
hmtoggle_plus1Fluid used for motor cooling:

 

LCC settings:

 

hmtoggle_plus1Operating cost settings: