Purpose and Application

The artesian oil-water pumps of type 12НА-9×4(1,2,3,5,6) are designed for pumping and draining crude oil and petroleum products from underground reservoirs. They are suitable for media with the following properties:

•  Density: up to 0.97×10³ kg/m³
•  Kinematic viscosity: from 0.01×10⁻⁴ to 0.8×10⁻⁴ m²/s
•  Solid particle size: up to 0.2 mm
•  Maximum volume concentration of solids: 0.2%
•  Fluid temperature range: from 258 K to 353 K (−15 °C to +80 °C)
•  Viscosity for petroleum products: max. 4×10⁻⁴ m²/s

Pumps are manufactured for various climatic categories and placement classes per GOST 15150-69: U1, U2, U3, UHL4, T2, T3, OM2, T5

According to GOST 27.003-90, these pumps, as part of the pump units, are classified as:

•  General-purpose products
•  Type 1 (recoverable items)

They are delivered in a general industrial explosion-proof configuration and are intended for use in hazardous (explosive and flammable) industries and installations.

Design

The pump consists of three main components:

1. Pump section
2. Discharge column
3. Support stand

The electric motor is mounted on the support stand.
 Pump type: centrifugal, multistage, vertical, with axial fluid intake.

Pump Section:

•  Comprises section casings and suction nozzle, connected via tie rods.
•  Each section casing acts as a diffuser with guide vanes for axial flow.
•  The suction nozzle has radial ribs to straighten incoming flow.
•  Impellers are mounted on a vertical shaft via split conical sleeves.
•  Impellers are hydraulically balanced to reduce axial loads via 10 mm relief holes in the rear disc.
•  Slide bearings are located in each section and suction nozzle.
  • Lubricated by the pumped fluid
  • Bearing sleeves: Bronze
  • Shaft: Steel 30X13 (alternative materials available)
  • Hydraulic part: Cast iron

Shaft and Transmission:

•  Intermediate shaft length varies depending on column length.
•  Shaft segments are connected by threaded couplings with thread direction opposite to rotation (prevents unscrewing).
•  Discharge elbow is integrated into the support stand for connecting discharge piping.

Shaft Seal:

•  Options include:
  • Single mechanical seal
  • Gland packing (soft stuffing box)

Model Designation Format

Example designations:

•  Pump: 12NA(E)-9×4a-05-B-5-4-M2 UHL4 TU U 28.1-38136281-001:2014
•  Pump Unit: A12NA(E)-9×4a-05-B-5-4-M2 UHL4 TU U 28.1-38136281-01:2014

Breakdown of the Designation

•  A – Pump unit (aggregated), semi-submersible artesian oil-water pump
•  12 – Outer casing diameter divided by 25, in mm
•  НА – Semi-submersible artesian oil-water pump
•  (Е) – Explosion-proof/fire-safe version (blank if not applicable)
•  9 – Specific speed of the pump (divided by 10)
•  4 – Number of stages (impellers)
•  а – First impeller trim (omitted if nominal diameter is used)
•  05 – Number of transmission sections (immersion depth variant)
•  В – Main material of pump parts:
  • В – Cast iron СЧ20 (GOST 1412-85)
  • A – Steel 20ГЛ (GOST 21357-87)
  • D – 20Х13Л (GOST 977-88)
  • K – 12Х18Н9ТЛ (GOST 977-88)
•  5 – Shaft seal type:
  • 5 – Single mechanical seal
  • С – Gland seal
  • СД – Double gland seal
  • 55 – Double mechanical seal
•  4 – Number of motor poles (corresponds to 25 s⁻¹ or 1500 RPM)
•  М2 – Second modernization version
•  УХЛ4 – Climate version UHL, placement category 4 (GOST 15150-69)
•  ТУ У 28.1-38136281-001:2014 – Technical specifications number

Technical Specifications Table (Nominal Conditions: ρ = 1000 kg/m³, T ≤ 30 °C)

Regulatory Compliance:

The entire pump series is covered by the following regulatory and conformity documents:

•  Technical Specifications (TU): TU U 28.1-38136281-001:2014 (registered with Ukraine’s Ministry of Industrial Policy)
•  Sanitary & Epidemiological Conclusion: №05.03.02-07/1806
•  Conformity with EAEU TR:
  • TR CU 010/2011 – Safety of machinery and equipment
  • TR CU 004/2011 – Low-voltage equipment safety
  • TR CU 020/2011 – Electromagnetic compatibility
•  Declaration of Conformity: TC № RU Д-UA.AУ04.В.15746

Belarus Permit: №11-1-329-2013 – For manufacturing and use on GPN RB facilities