1K 50-32-125 - Centrifugal overhung pumps K, 1K

  • Series description
  • Technical characteristics
  • Downloads
K, 1K
  • Overhung
  • Nuclear power
  • Metallurgy, mining
  • Water intake
  • Water supply
  • Water supply
  • Clear water
  • Hot water


Centrifugal overhung pumps К , 1К series and electric pump units on their base (hereinafter referred to as the units) are intended for pumping process water (except for sea water), as well as other liquids similar to water in density, viscosity and chemical activity with рН=6…9, with a content of solid inclusions not exceeding 1% by mass and of size 0,2 mm maximum and at temperature of liquid to be handled from 263 up to 358 К (from minus 10 up to +105°С), some standard sizes - from 263up to 378К (from -10 up to +85°С).

The pumps (units) are related to the items of aspect 1 (repairable ones) as per GOST 27.003-90 and are manufactured in climatic version U3.1 as per GOST 15150-69.

The pumps provided with face sealing of the shaft and furnished with explosion-proof motors are intended for installing in explosion-and-fire dangerous premises. The class of explosion-hazard zone is 1,2 GOST R 51330.9-99.

Pumps and units are supplied for export as per OST 26-06-2011-79.

General safety requirements of pump and unit as per GOST R 52743-2007.


Pumps 1К series – are centrifugal, horizontal, borehole furnished with a gland seal (i.e. stuffing-box seal) or an end-face seal of the shaft.

The pump casing is a cast iron casting in which suction and discharge nozzles, the spiral & ring-shaped bend (bleed fitting) and supporting foot are executed. Suction and discharge nozzles is arranged along the axis of rotation, the outlet branch pipe is directed vertically upwards and is positioned in the same plane with the axis of rotation.

The impeller – is centrifugal, single-suction, closed-type. The supply of liquid to the impeller is an axial one.

The impeller is load relieved from axial stresses on the pumps having a nominal diameter of the impeller of 200-315mm through the discharge openings (equalizing holes) executed on the main disk of the impeller, but on the pumps having a nominal diameter of the impeller of 160mm – by the blade made on the main disk of the impeller.

The rotor of the pump is put in rotation by electric motor through the coupling with rubber-bushed studs. It is admitted to use other types of couplings. Two radial thrust bearings arranged in the bracket are served as rotor supports.

The sense of rotor rotation – is clockwise, as viewed from the drive end.

Mounting dimensions of the flanges are made as per GOST 12815-80, type 1.


  • pumping of pure (cold/hot) water in water supply systems in complexes of housing and communal services, municipal water canals
  • additional circulation in water and heat supply systems of apartments and household objects
  • supply systems of service water, for technological processes of industrial enterprises including oil refining and metallurgical branches
  • providing with water of gardening and garden suburbs
  • fire extinguishing systems of inhabited and civil objects
  • heat supply facilities - thermal power plant, the nuclear power plant, for work of the main and auxiliary systems of stations which are connected with use of pure and service water

Features /Advantages

  • own supporting foots enable pump dismantling without disconnection from pipelines (except 1K8/18, 1K20/30, K45/30, K160/30, K290/30 pumps)
  • extensive impeller diameter selection , including customized, enables optimal pump selection according to operatihg conditions
  • stuffing box made of modern thermal expanded graphite considerably reduces time for maintenance
  • single mechanical seals expand pump applications and enable their operation in explosion-dangerous and fire-dangerous places

Technical parameters

Options Values
Series K, 1K
Flow (nomin.), m³/h 12.5
Head, m 20
Pump power input (max.), kW 1.6
Rotation speed, rpm 2900
Rotation speed, c˜¹ 48
Pump inlet pressure, kgf/sm², max 3.5
Pump efficiency,% 58
Voltage, V 220/380
Frequency, Hz 50
Type of current AC
Admissible positive suction head, m, max 3.5

Pump type key

Example 1К80-50-200а-с U3.1 TU 3631-096-05747979-97, where :

  • 1 – modernization serial number
  • К – overhung pumps
  • 80 – diameter of suction nozzle, mm
  • 50 – diameter of discharge nozzle , mm
  • 200 –diameter of impeller (conventional), mm
  • а – impeller turning index : а,b,v - reduced diameter of the impeller, l, m - enlarged diameter of the impeller
  • с - type of seal: с - gland seal, t- end-face seal
  • U3.1 – climatic version and location category
or  xample,  К45/30 У3.1 ТУ3631-226-05747979-2003, where :
  • К - overhung pumps
  • 45 - flow (nomin.), m³/h
  • 30 - head, m
  • У3.1 - climatic version and location category

Instruction manual :

All technical documentation in the Russian version of the site »

Certificates, permits :

All certificates, permits in the Russian version of the site »

Order forms :

  • "General order form for pumps"
    (19.07.2013 / 54.5 Kb / doc)