Question 1

What is a screw pump?

Accepted Answer

Screw pump is a part of the dry compressed gas transfer pump series. They are positive displacement pumps that use one or more screws to move fluid or water along the screw shaft. These screws interlock to pressurize the fluid and move it into the system. These screws engage each other and reciprocate in the cavity of the cylinder. They are often used in industrial vacuum applications, often in combination with Roots blowers, and as oil-free roughing pumps in high vacuum and ultra-high vacuum systems. Please check out the description of various pumps.

Question 2

What is the purpose of a screw pump?

Accepted Answer

Netzsch screw pump is mostly used on fluids of a higher viscosity, moving these fluids with screw pumps results in energy efficient and a relatively compact machine when compared to other pump types i.e centrifugal pump.

Question 3

What is difference between gear pump and screw pump?

Accepted Answer

The operation of a screw pump is much softer with less pulsations, less noise and fewer vibrations, meaning longer lifespan. Gear pumps are noisier, more turbulent and cause more vibrations for the pump and pipework to withstand causing a lower working life.

Question 4

What is the efficiency of a screw pump?

Accepted Answer

Archimedean screw pumps are capable of pumping heavily contaminated surface water or sewage, and even sand if they are specially designed for this purpose. The head is purely geodetic and ranges up to 6 m at efficiencies between 60 and 80 %.

Parameters	Unit	2NSH-/16L1E	2NSH-/16L2E	2NSH-/16L3E
Operating rotational speed	RPM	up to 1.800	up to 1.800	up to 1.800
Cleaning rotational speed	RPM	up to 3.600	up to 3.600	up to 3.600
Standard flow differential pressure	Bar	maximum 16 bar ¹	maximum 16 bar ¹	maximum 16 bar ¹
Reverse flow differential pressure	Bar	maximum 12 bar ¹	maximum 12 bar ¹	maximum 12 bar ¹
Viscosity	cP	from 1 to 1,000,000 ²	from 1 to 1,000,000 ²	from 1 to 1,000,000 ²
Temperature of the pumped fluid	ºC	from -20 to 130 3	from -20 to 130 3	from -20 to 130 3
Size of the discharge nozzle	In.	1,5″ up to 2,0″	2″ up to 3.0″	2.5″ up to 4″
Size of the suction nozzle	In.	1,5″ up to 2,5″	2″ up to 4.0″	3″ up to 4″
Installation position	—	Horizontal	Horizonta	Horizontal
Maximum flow rate	m³/h	up to 11 m³/h	up to 25 m³/h	up to 65 m³/h
Material of wetted parts	—	AISI 316L (standard)	AISI 316L (standard)	AISI 316L (standard)

NETZSCH NOTOS® 2NSH Hygienic Twin Screw Pump

NETZSCH NOTOS® 2NSH Screw Pump

Broad range of applications

Screw Pump General Characteristics

NETZSCH NOTOS® 2NSH Screw Pump Parmeters List