Purpose

Artesian oil-water pumps of the 20НА-22х3(1,2,4,5,6) type are designed for pumping and extracting oil and petroleum products from underground reservoirs. These fluids must have a density not exceeding 0.97×10³ kg/m³ and a kinematic viscosity between 0.01×10⁻⁴ and 0.8×10⁻⁴ m²/s, and may contain solid inclusions up to 0.2 mm in size with a volumetric concentration not exceeding 0.2%.
 The temperature range of the pumped petroleum products is from 258 to 353 K (–15 to +80 °C), with a viscosity not exceeding 4×10⁻⁴ m²/s.
 The pumps are manufactured in climate versions and placement categories: U1, U2, U3, UHL4, T2, T3, OM2, T5, in accordance with GOST 15150-69.

As part of a pumping unit (per GOST 27.003-90), these pumps are classified as general-purpose, type 1, repairable products.

The units are produced in general industrial explosion-proof versions and are intended for transferring petroleum products in explosion- and fire-hazardous industries and installations.

Design

The pump consists of three main components:

•  Pump section
•  Discharge column
•  Support stand (with the electric motor mounted on it)

The pump is centrifugal, sectional, vertical, with axial fluid inlet.
 The pump section stator is assembled from stage casings and a suction nozzle, connected by studs.
 Each stage casing includes a guide vane assembly with spatial blades ensuring axial flow into the next impeller.
 Radial ribs in the suction nozzle prevent swirl before the first impeller.

Impellers are mounted on a vertical shaft using split conical sleeves and are largely relieved from axial forces. To reduce axial load, each impeller has 10 mm balancing holes.

Slide bearings are installed in each pump section and suction nozzle. They are lubricated by the pumped petroleum product.

•  Bearing sleeves: bronze
•  Shafts: steel 30X13 (customizable based on operating conditions)
•  Hydraulic parts: cast iron

The number of intermediate shaft sections depends on the required immersion depth and are connected by threaded couplings with a thread direction opposite to the shaft rotation to prevent loosening.

The discharge elbow is built into the support stand and connects to the discharge pipeline.
 Shaft sealing at the discharge elbow is either a mechanical seal or a stuffing box with soft packing.

Designation Example

Pump:  20НА(Е)-22х3а-02-В-5-4-М2 УХЛ4 ТУ У 28.1-38136281-001:2014

Unit: А20НА(Е)-22х3а-02-В-5-4-М2 УХЛ4 ТУ У 28.1-38136281-001:2014

Where:

•  А – pumping unit, oil-water, semi-submersible, artesian type
•  20 – casing diameter (20 × 25 = 500 mm)
•  НА – oil-water, semi-submersible artesian pump
•  (Е) – version for hazardous/explosive environments; no letter = safe area version
•  22 – specific speed coefficient (22 × 10 = 220)
•  3 – number of stages (impellers)
•  а – first impeller trimming (not specified for nominal size)
•  02 – immersion depth variant
•  В – material: grey cast iron СЧ20 per GOST 1412-85
  • Alternatives: А (steel 20ГЛ), Д (steel 20Х13Л), К (steel 12Х18Н9ТЛ)
•  5 – mechanical shaft seal
  • Alternatives: С (stuffing box), СД (double stuffing), 55 (double mechanical)
•  4 – motor pole count (shaft speed: 1500 rpm)
•  М2 – second modification
•  УХЛ4 – climate version UHL, placement category 4 (GOST 15150-69)
•  TУ У... – specification standard

Performance Specifications

(For water at 1000 kg/m³, up to 30°C, shaft speeds 1500 and 1000 rpm)

Certification & Compliance

All products are certified with the following:

•  TУ У 28.1-38136281-001:2014 (registered with the Ministry of Industrial Policy of Ukraine)
•  Sanitary-Epidemiological Conclusion № 05.03.02-07/1806
•  Compliant with:
  • TR CU 010/2011 “On safety of machinery and equipment”
  • TR CU 004/2011 “On safety of low-voltage equipment”
  • TR CU 020/2011 “Electromagnetic compatibility of technical devices”
•  Declaration of Conformity: TC № RU Д-UA.AУ04.В.15746
•  Permission from the State Industrial Safety Inspectorate of Belarus № 11-1-329-2013