Pumps and pumping units

Helvess Limited Company is able to develop, provide and implement innovative technologies of global manufacturers of pumps used in agricultural and chemical industries.

Pumping equipment can be classified according to the operation principle:

Dynamic pumps:

  • centrifugal;
  • axial;
  • diagonal;
  • vortex;
  • disk;
 Displacement pumps:

  • reciprocating-type (piston, plunger);
  • diaphragm;
  • gear-type;
  • screw;
  • peristaltic, etc.

The most common types are centrifugal, piston and screw pumps.

 

Advantages and benefits of centrifugal pumps:

  • reliable operation;
  • high efficiency;
  • operation with high shaft speed;
  • all-purposeness, large model range;
  • flow uniformity;
  • compact dimensions;
  • easy operation and maintenance;
  • low cost;
  • low energy consumption;

Application of centrifugal pumps:

  • general industrial applications;
  • rural and urban facilities;
  • fire safety in industrial facilities;
  • water treatment and water purification;
  • chemical industry;
  • construction industry;
  • cooling and heating systems;
  • food and cosmetics industry;
  • manufacturing and pharmaceutical industry;

 

Advantages and benefits of piston pumps:

  • high head values;
  • operation with different liquids;
  • wide range of industrial applications;
  • self-priming;
  • long service life of spare parts;
  • low speed;
  • high efficiency;
  • high reliability and easy maintenance;

Application of piston pumps:

  • water supply systems;
  • chemical and food industry;
  • processing of construction mixtures;
  • aggressive and poisonous chemical liquids pumping;

Application of high-pressure piston pumps:

  • cleaning of heat-exchanging equipment;
  • removal of coatings, street markings, rubber, rust;
  • cutting of steel structures, pipelines;

 

Advantages and benefits of screw pumps:

  • high efficiency
  • reliable equipment for constant operation
  • simple design
  • low noise and pulsation level
  • precise dosing of viscous liquids
  • convenient maintenance and repair
  • low cost
  • low power consumption
  • high pressure with less power consumption
  • resistance to wear and tear
  • pumping of liquids with high viscosity

Application of screw pumps:

  • chemical industry (dosed delivery of polymers and flocculants)
  • pulp and paper production;
  • water treatment and purification (handling of reagents, sand and cement slurries);
  • food industry (confectionery products, pumping of honey, fats, fruit juices)
  • construction industry (ground water pumping, river water transportation)
  • cosmetics (liquid soaps and shampoos pumping)
  • shipbuilding;

 

Pump for water solutions

Medium density 520 kg/m3
Viscosity @ 40°C 6.1-7 mPas
Temperature From -80 to +35°C
Seal type Mechanical
Rated flow 251.1 m3/h
Rated head 206.7 m
Efficiency 66%
NPSHr 4.5 m
Speed 2980 rpm
Shaft power 111.4 kW

 

Pump for water solutions

Medium density 520 kg/m3
Viscosity @ 40°C 6.1-7 mPas
Temperature From -45 to +35°C
Flow 106.6 m3/h
Head 62.5 m
Efficiency 66%
NPSHr 4 m
Shaft speed 2970 rpm
Shaft power 14.29 kW

 

Pump type Vertical semi-submersible centrifugal pump
Flow rate, Q 450 m3/h
Head, H 50 m
Submersion depth, L 1550 mm
NPSHA 7.3 m
NPSHR 3.5 m
Operation medium Ammonia, ammonia water
   
Material  
Casing SS 304
Impeller SS 304
Shaft 17-4PH
Bearing bracket GG25
   
Pump bearing SKF
Seal type Mechanical seal
Seal Plan 14+52/M
   
Motor  
Power 110 kW
Shaft speed 1480 rpm
Power supply 380 V/50 Hz/3 ph

 

Pumps for ammonia water and carbamate solution

Medium ammonia water + carbamate solution
Operation temperature (OT) 41-60 °C
Density @ OT 1000 kg/m³
Viscosity @ OT 0.6 cSt
Flowrate 43.2 m³/h
Head 98 h
Pressure drop depends on density
Pump NPSH 2.9 м
Unit NPSH required 3.4 m
Required pump power 18 kW
Design motor power 22 kW
Suction nozzle/pressure nozzle 65 / 50 mm

Motor:

Motor power 22 kW
Voltage / Frequency 400V / 50 Hz
Speed 2900 1/min
IP  / Design IP 55 / В 35

 

Pumps for liquid ammonia

Operation parameters:

Medium liquid ammonia
Operation temperature (OT) 80 °C
Density @ OT 920 kg/m³
Viscosity @ OT 0.32 cSt
Flowrate 21.2 m³/h
Head 28 m
Pump NPSH 2.5 m
Inflow geodesic height angle available
Unit NPSH required 3.0 m
Required pump power 3.2 kW
Design motor power 4.0 kW
Suction nozzle/pressure nozzle 50 / 40 mm

Motor:

Motor power 4.0 kW
Voltage / Frequency 400 V / 50 Hz
Speed 2900 1/min
IP  / Design IP 55 / В 35

 

Feedwater pump

Initial data: Parameter Value
Medium feedwater
Required flow, m3/h 300
Head, m 465
Operating temperature, °C +165 °C;
Medium density, g/cm3 1.155
Chemical composition:
— salt content:
— iron content:
— chlorides:		  
3.0 mg/dm3;
0.02 mg/dm3;
0.2 mg/dm3;
pH 6.0 – 9.0;
Suction pressure, bar g 7.2
Installation place: indoors;
Electric motor: Explosion proof design (1Exp II CT6);
Supply voltage: 6000 V;
IP class: IP66
Main features: Pump type: multistage
Explosion protection group 2 IIC T3
Volumetric flow: 300 m3/h
Total head: 475 m
Efficiency at operating temperature: 77.5%
Rotation frequency 2987 rpm
Electric motor: Power: 600 kW
Voltage: 6000 V
Frequency: 50 Hz
Speed: 2980 rpm
Explosion protection: II 2G Ex db eb IIC T4 Gb
IP class: IP65
Cooling medium temperature: 40 °C
Ambient temperature: -20 °C to +40 °C
Installation height ASL 1000 m

 

Centrifugal feed pump

Number of stages: 10
Medium: feedwater
Temperature: 147 °C
Viscosity: 1 cP
Density: 920 kg/m3

 

Rated flow: 271.7+3 m3/h
Rated head: 1964 m
NPSHr: 8 m
Efficiency: 70.5 %
Rotation frequency: 2980 rpm
Shaft power: 1992 kW
Material design: C-6

 

Electric motor power: 2200 kW
Voltage: 10000 V
Frequency: 50 Hz
Design variant: B3,
Rotation frequency: 2980 rpm

Scope of supply:

  • Pump
  • Motor (optional)

 

Methanol pump

Flow rate 3.5 m³/h
Differential head 117 m
NPSHa Min. 2.5 m
NPSHr 2 m
Impeller diameter 145 mm
Hydraulic efficiency 20%
Power consumption 4.4 kW
Number of stages 5
Shaft rotation frequency 2950 rpm
Min. constant feed 2 m³/h

 

Electric motor

Power 7 kW
Voltage 380 V
Insulation class H
IP class IP55
Shaft rotation frequency 2865 rpm

 

Pumps for alkali solution

Medium data

Medium 2-25% NaOH alkali solution
Ambient temperature +7… +41 °C
Medium temperature +20… +60 °C
Density 1050…1250 kg/m³

Motor

Voltage/frequency/phase 400 V/50 Hz/3
Power 0,18 kW
Rotation speed 1500 rpm
IP IP 55

 

Pump for sodium hydroxide solution

Pumped medium: alkali solution:
Operation temperature: 37,0…64,0 °C
Density at operation temperature: 1,10 kg/dm³
Kinematic viscosity at operation temperature: 1,0 mm²/s

Technical data

Flow rate: 8,2 m³/h
Head: 65,0 m
Pump power: 2,9 kW
Rotation speed: 2900 1/min
Outlet nozzle pressure: 16,0 bar
NPSH: 2,0 m

Motor:

DC, 3 phase  
Power: 4,0 kW
Voltage: 230 / 400 V
Frequency: 50 Hz
IP: IP55
Insulation class: F

 

Pump for concentrated sulphuric acid

Type centrifugal
Flow rate 12 m³/h
Head 32 m
Impeller diameter 195 mm
Rotation speed 2920 rpm
Rotation direction clockwise (when seen from the drive end)
Consumed power 8,7 kW
NPSH 5,1 m

Medium data

Medium 93% sulphuric acid
Solids no. 50…100 g/m3
Solids size max 1 mm
Ambient temperature -40 … +40°C
Operation temperature Up to +60°C
Density 1980 kg/m³

Motor

Voltage/frequency 400 V/50 Hz
Power 18,5 kW
Rotation speed 2920 rpm

 

Centrifugal pump for weak sulphuric acid solution

Pump type Horizontal, centrifugal
Flow rate 300 m³/h
Head 105 m
Consumed power 122 kW
Pump shaft rotation speed 3265 rpm
NPSH 4,87 m
Impeller diameter 295 mm
Medium: weak sulphuric acid solution, pH=1,73
Operation temperature 5°C
Density 1100 kg/m³

Electric motor

Voltage 380 V
Frequency 50 Hz
Power 160 kW
Rotation speed 2980 rpm
IP/Design IP55

 

Corrosion-resistant centrifugal pumps of various designs and configurations

One-stage heavy process pumps

Q = up to 850 m3/hr, PN = up to 160 bar

Pumps for corrosive chemicals

Q = up to 2000 m3/hr, PN = up to 25 bar

Volute pumps 
Q = up to 1800 m3/hr, PN = up to 16/25 bar

Process pumps with open impellers
Q = up to 800 m3/hr, PN = up to 40 bar

Horizontal & vertical multistage high-pressure pumps
Q = up to 300 m3/hr, PN = up to 160 bar

Horizontal & vertical multistage explosion-proof pumps
Q = up to 500 m3/hr, PN = 10-100 bar

Multistage high-pressure pumps for low NPSH values
Q = up to 800 m3/hr, PN = up to 40/64 bar

Propeller pumps
Q = up to 7000 m3/hr, PN = up to 6 bar

Self-priming centrifugal pumps
Q = up to 100 m3/hr, PN = up to 10 bar

Multistage self-priming centrifugal pumps
Q = up to 500 m3/hr, PN = 6-40 bar

Hermetic pumps with magnetic couplings
Q = up to 1000 m3/hr

Horizontal and vertical centrifugal slurry pumps
Q = up to 8000 m3/hr, PN = up to 10 bar

All models conform to DIN & API standards

Steam turbines and electric generators

Steam pressure: up to 67 bar
Temperature: up to 540°C
Output power: up to 50MW

 

Metering pumps

Variable eccentric pump drive.

Performance:
Pressure up to 7 bar
Flow rate up to 4,5 m3/h per pump head
Temperature up to 400°C

 

  • Rod thrust: 6 kN
  • Stroke length: 30 mm
  • Stroke adjustment: available with fixed stroke length or with stroke length adjustment. Setting of stroke length is carried out manually or electrically
  • Linear stroke adjustment in steps of 0.01 mm via hand wheel while pump is stopped or in operation. Proven variable eccentric drive principle, that means stroke length is adjusted where it arises: at the eccentric
  • API 675 specification is met
  • Differing stroke rates make it possible to meet requirements for different fluids and process conditions
  • Pump head types: plunger- and diaphragm pump heads can be mounted
  • Drive: AC and DC motors, frequency inverter possible
  • Attachable instruments: contactor

Method of operation

The drive shaft turns the eccentric via the worm gear and the hollow shaft. The connecting rod converts the rotary motion of the plunger rod. The stroke length for the displacer movement is set (with the pump stopped or in operation) through radial shifting of the eccentric. For this the sliding shaft is axially shifted via the adjusting spindle. The axial movement of the sliding shaft is converted into a radial movement of the eccentric via the skew-slotted groove in the hollow shaft.