Pérdida de presión Curva del sistema  


La curva del sistema e la curva de la bomba
Curva del sistema 1




Define your system curve in 5 steps

1. Configure the flow diagram. Click valves open or close.
2. Enter title and medium.
3. Parameters for frictionless flow (Bernoulli).
4. Parameters for viscous flow (pipe friction / Colebrook, valves, etc.).
5. Save your data.




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p 1
p 4

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h 1

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clic en la válvula para abrirla

Nombre de característica
Comentario
Caudal nominal*   m³/h

Fluido Temperatura ºC
Densidad* kg/m³ Viscosidad Din.  (Newton)* mPas


Flujo sin fricción

Bernoulli´s equation stands for all parameters that influence pressure loss in frictionless regime: absolute pressures, suction height, height of discharge and speed (diameter). Pressure loss caused by friction and turbulence we deal with further down. Data for suction side and pressure side is collected separately to determine the pressure rise accross the pump. Absolute pressure on the pumps suction side must stay below its NPSH value to avoid cavitation caused by evaporation inside the pump.

Lado de succión

Lado de presión


Bernoulli Tubo de acero Tubo de Plástico

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  p1  bar,abs Presión absoluta!   p4=p1  
  h1*  m     h4=h1  
  tubo detrás del tanque compensador las toberas de la bomba   tubo delante del tanque compensador
  d1*  mm d2*   mm        d3*   mm   d4=d1


Pérdida de presión en el flujo viscoso

A. Tubería


The equation of Darcy-Weisbach allows to determine the pressure loss of straight piping and bends. Darcy Friction Factor is calculated by the law of Hagen-Poiseulle for laminar flow. For transition zone and turbulent flow Darcy Friction Factor is calculated by the equation of Colebrook (Moody). Laminar flow through bends is calculated according to Ghia, non-laminar flow according to Krüger. Data for suction side and pressure side is collected separately to determine the pressure rise accross the pump. Absolute pressure on the pumps suction side must stay below its NPSH value to avoid cavitation caused by evaporation inside the pump. We start with choosing the roughness of the inner pipe wall. Click the link roughness for help.


Rugosidad superficial    mm

Lado de succión

Lado de presión

Tubo recto

Medio del cálculo Tubo de acero Tubo de Plástico
dSucc,1   mm      Longitud    m   dPresión,1   mm      Longitud    m

Codos 90º


Medio del cálculo Tubo de acero Tubo de Plástico
Número        d =dSucc,1      r/dSucc,1  Número       d =dPresión,1      r/dPresión,1 



B. Elementos varios: accesorios de tubería, filtros, válvulas, caudalímetros, intercambiadores, etc.


First we look at components with a known maximum pressure drop. Filters have to be changed or cleaned at maximum pressure drop. Components that tend to plug or become incrusted have to be cleaned at maximum pressure drop. Data for suction side and pressure side is collected separately to determine the pressure rise accross the pump. Absolute pressure on the pumps suction side must stay below its NPSH value to avoid cavitation caused by evaporation inside the pump.



Δ p = constante
Nombre    Pérdida de presión   bar Nombre    Pérdida de presión   bar
Nombre    Pérdida de presión   bar Nombre    Pérdida de presión   bar
Nombre    Pérdida de presión   bar Nombre    Pérdida de presión   bar

Lado de succión

Lado de presión

Flow coefficient cv of a component equals its water flow in [gal/min] at a pressure loss of 1 [psi]. Flow coefficient kv equals its water flow in [m³/h] at a pressure loss of 1 [bar]. The tab above the entry area leads to kv values of various valves. Flow coefficients cv can be converted to kv - see link kv or choose the calculator from the main menue. More theory as always on the left corner of the entry area.



Coeficiente de caudal    kv   cv kv para diversas válvulas
  Nombre    Número    Nombre    Número 
  kv  m³/h H20 @ Δp = 1 [bar]   kv  m³/h H20 @ Δp = 1 [bar]
  Nombre    Número    Nombre    Número 
  kv  m³/h H20 @ Δp = 1 [bar]   kv  m³/h H20 @ Δp = 1 [bar]
  Nombre    Número    Nombre    Número 
  kv  m³/h H20 @ Δp = 1 [bar]   kv  m³/h H20 @ Δp = 1 [bar]

Lado de succión

Lado de presión


Friction Factor K is the proportional factor of the Darcy-Weisbach equation. Click the tab above the entry area for K values of various valves. More theory as always on the left corner of the entry area.



Coeficiente de resistencia   K K para diversas válvulas
  Nombre    Número    Nombre    Número 
  Coeficiente de resistencia K  [-]   Coeficiente de resistencia K  [-]
  Diámetro   mm   Diámetro   mm
  Nombre    Número    Nombre    Número 
  Coeficiente de resistencia K  [-]   Coeficiente de resistencia K  [-]
  Diámetro   mm   Diámetro   mm
  Nombre    Número    Nombre    Número 
  Coeficiente de resistencia K  [-]   Coeficiente de resistencia K  [-]
  Diámetro   mm   Diámetro   mm

Lado de succión

Lado de presión


Sometimes neither a cv value nor a friction factor is known for the component in question. But pressure loss and flow for one point of operation. This data can be used as reference the same way we use cv values. Darcy-Weisbach equation allows the conversion to different flows, pressure losss and densities.



un punto de servicio conocido
  Nombre    Número    Nombre    Número 
  Pérdida de presión   bar   Pérdida de presión   bar
  Flujo de volumen   m³/h   Flujo de volumen   m³/h
  Densidad   kg/m³   Densidad   kg/m³
  Nombre    Número    Nombre    Número 
  Pérdida de presión   bar   Pérdida de presión   bar
  Flujo de volumen   m³/h   Flujo de volumen   m³/h
  Densidad   kg/m³   Densidad   kg/m³





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