NL

Design

Single-stage low-pressure centrifugal pump with axial suction point, according to EN 733 and ISO 5199, mounted on a baseplate.

Application

Pumping clean or slightly contaminated water (max. 20 ppm) without solid matter for circulation, transfer and pressure boosting purposes
Pumping heating water in accordance with VDI 2035, water/glycol mixtures, cooling/cold water and industrial water.
Applications in municipal water supply, irrigation, building services, general industry, power stations, etc.

Type key
Example	NL 40/200B-11/2
NL	Standard pump with axial suction
40	DN for the pressure flange
200B	Nominal diameter of impeller
11	Nominal motor power in kW
2	2-pole motor

Special features/product advantages

• Burgmann mechanical seal with conical sealing chamber
• Brand shaft protection
• SPM connections for vibration and temperature sensors
• Shaft deflection according to DIN ISO 5199
• Permanently lubricated, generously dimensioned ball bearings (2Z version)

Scope of delivery

• Pump with free shaft end or
• Pump on baseplate with coupling and coupling protection, without motor or
• Completely mounted pump on baseplate with electric motor
• Housing: EN‐GJL 250 ‐ grey cast iron; Impeller: EN‐GJL 250 ‐ cast iron or CC480K‐GS bronze; Mechanical seal;standard coupling or spacer coupling
• Installation and operating instructions

 

Materials

• Pump housing
• Grey cast iron spiral with anti-rotation ribs.
• With axially aligned suction piece and radial pressure ports and cast assembly feet.
• Dimensions and hydraulics are in accordance with DIN EN 733
• Flange PN 16 in accordance with DIN 2533 (DN 200 - PN 10/DIN 2532)
• Standard mechanical shaft seal AQ1EGG for water up to 120°C
• Stuffing box for water up to 110°C

Description / Design

• Single-stage low-pressure centrifugal pump as baseplate pump with axial suction piece with flanged bearing bracket and axis mounting for flexibly coupled drives.
• Spacer coupling (sleeve coupling) available as an option; they make it possible to leave the motor in position when removing the rotor unit.
• Shaft deflection meets the requirements of ISO 5199

Commissioning

• If pumps with 2900 rpm are installed inside residential buildings, then corresponding noise reducing measures are to be implemented.
• Pump curves and specific motor powers depend on the respective fluid being pumped. Pump curves and power vary considerably when fluids are conveyed that differ from water in thickness and/or viscosity. For this, please observe the table "Recommended limit values for dimensioning".
  The recommended limit values for dimensioning are calculated as follows:
  
  Q_optimum (volume flow at which the pump reaches its best efficiency) to be read from the individual pump curve; factors Q_min and Q_maks to be taken from the table "Recommended limit values for dimensioning".
  
  Q_min dimensioning = Q_min x Q_optimum
  Q_maks dimensioning = Q_maks x Q_optimum
  
  Example: Yapı boyutu NL 32-125
  
  Q_min = 0,3 x 8 = 2,4 m3/h
  Q_maks = 1,2 x 8 = 9,6 m3/h
  
  
• Load-sensitive pump output All Wilo standard pumps are equipped with IEC standard motors. The Wilo control devices are suitable for automatic load-sensitive speed control of pumps that are driven by any standard motors of conventional manufacture.
• Main/standby mode

Accessories

Automatic speed control: for automatic, infinitely variable pump power control. for additional information, see "Switchgears and control devices" section.

General notes - ErP (ecological design-) directive

• The benchmark for most efficient water pumps is MEI ≥ 0.70
• The efficiency of a pump with a trimmed impeller is usually lower than that of a pump with the full impeller diameter. The trimming of the impeller will adapt the pump to a fixed duty point, leading to reduced energy consumption. The minimum efficiency index (MEI) is based on the full impeller diameter.
• The operation of this water pump with variable duty points may be more efficient and economic when controlled, for example, by the use of a variable speed drive that matches the pump duty to the system.
• Information on benchmark efficiency is available at www.europump.org/efficiencycharts