Single-screw electric pumps are intended for pumping pure and polluted liquids having temperature up to 353К (80°С), chemically active liquids with cinematic viscosity up to 4600sSt (620°E). Maximum concentration of mechanical admixtures up to 5% by mass and up to 2 mm in size.
Viscosity limits and operating temperature of pumped liquid are to be coordinated with manufacturer at the order.
Electric pump is fabricated in climatic version ОМ, in-service location category 3 as per ГОСТ 15150-69 and is intended for installing on the ships with unlimited region of navigation, in the premises at an ambient temperature of air ranging from minus 30 up to +48°C (from 243 up to 321К).
At the Customer's request the electric pump may be fabricated in climatic version ОМ, location category 5.
Conventional alpha-numeric designation in orders, correspondence and other documentation should correspond to the indexing adopted in the pump building branch.
Pumps included in the units according to reliability parameters are related to the items of aspect 1 (repairable ones) as per GOST 27.003-90. Climatic version UHL, location category 4.2 GOST 15150. At the Customer's request the electric pump may be fabricated in other climatic version and location category.
The safety requirements as per GOST Р 52743 and norms and rules of Rostechnadzor (Technical Supervision of Russia) according to PB 08-624-03, PB 09-540-03, PB 09-563-03.
N1V single-screw pumps and units - horizontal, consisting of the single-screw pump and a drive, mounted on the common frame. Except the electric motor , reducer and (or) a variator for measuring rotating speeds of driving shaft and supply control can be included in a drive. Connection of drive and pump is carried out by a coupling.
As to the principle of operation the single-screw electric pump is a positive displacement machine.
For pumps N1Vг 60/100 and N1N 170/36 - screw is multiple-thread (Z=3) right, for all other pumps - screw is one-thread (Z=1) right.
Pump shell is a steel sleeve with rubber gasket vulcanized to it . For pumps N1V 60/100 and N1V 170/36 the shell is four-thread, for other pumps - two-thread.
The driving shaft is located in pump bracket and rotates in rolling bearings. Screw connects with a driving shaft is through drive shaft either a torsion shaft, or eccentric coupling.
Shaft seal is end face seal or stuffing box. The type of sealing coordinates with the Customer.
The direction of rotation of a driving shaft depending on pump type can be right-handed or left-handed (if view from the shaft end).
|Pump models||Flow, m³/h, least||Rotation speed, rpm||Rotation speed, c˜¹||Rotation speed (rang), rpm||Rotation speed (rang), c˜¹||Pump inlet pressure, kgf/sm², max||Pump outlet pressure, kgf/sm², max||Efficiency,%||Voltage, V||Frequency, Hz||Type of current||Allowable vacuum suction, m|
Example N1Vg 80/5-6,3/5ЕN-SD-Rp-1 UHL 4.2 TU 26-06-1612-90, where: