Purpose and Application

Submersible Artesian Oil-Water Pumps of the 12NA-22×6 (1,2,3,4,5) type are designed for pumping or draining oil and petroleum products from deep tanks. The pumped medium may have a density up to 0.97×10³ kg/m³ and kinematic viscosity from 0.01×10⁻⁴ to 0.8×10⁻⁴ m²/s, containing solid particles up to 0.2 mm in size with a volume concentration not exceeding 0.2%.
Operating temperature range: from 258 to 353 K (−15°C to +80°C), viscosity not more than 4×10⁻⁴ m²/s.
Pumps are manufactured in climate and placement categories U1, U2, U3, UHL4, T2, T3, OM2, T5 according to GOST 15150-69.
In compliance with GOST 27.003-90, these are general-purpose, repairable units of category 1.
Pump assemblies are supplied in explosion-proof industrial design, suitable for hazardous environments involving flammable and explosive fluids.

Design
The pump consists of three main assemblies:

•  Pumping section
•  Discharge column
•  Support stand with electric motor

The unit is a vertical, centrifugal, multistage sectional pump with axial fluid inlet.
The stator includes sectional casings and a suction pipe, fastened with tie rods.
The guide vanes in the casing ensure axial flow and reduce swirl. Impellers are mounted on a vertical shaft using split conical sleeves, and are hydraulically unloaded via 10 mm balance holes.

Slide bearings are installed in each pump section and suction pipe, lubricated by the pumped fluid.
Materials:

•  Shaft: 30X13 steel (alternatives available)
•  Bearings: Bronze
•  Flow path: Cast iron

The intermediate shaft length varies depending on immersion depth. Shafts are joined with threaded couplings in reverse rotation direction to avoid loosening.
Shaft seal: single mechanical seal or packed gland with soft packing.

Model Designation Format

Example of the Designation:
 Pump: 12NA(E)-22×6a-04-B-5-4-M2 UHL4 TU U 28.1-38136281-001:2014
 Pump unit: A12NA(E)-22×6a-04-B-5-4-M2 UHL4 TU U 28.1-38136281-001:2014

Breakdown of the Designation:

•  A – Pump unit (submersible, artesian, oil-water type)
•  12 – Diameter of casing pipe ÷ 25 (in mm)
•  NA – Oil-water submersible artesian pump
•  (E) – Explosion-proof (absent if non-explosion-proof)
•  22 – Specific speed ÷ 10
•  6 – Number of stages (impellers)
•  a – First impeller trim (omitted if nominal)
•  04 – Number of transmission sections (immersion variant)
•  B – Main material: Cast Iron СЧ20 per GOST 1412-85
  • A – Steel 20ГЛ
  • D – Steel 20Х13Л
  • K – Stainless 12Х18Н9ТЛ
•  5 – Shaft seal type:
  • 5 – Mechanical
  • С – Gland
  • СД – Double gland
  • 55 – Double mechanical
•  4 – Number of motor poles (25 s⁻¹ / 1500 RPM)
•  M2 – 2nd design revision
•  UHL4 – Climatic design and placement category
•  TU – Technical specification number

Performance Specifications

Regulatory Compliance: All products are certified under:

•  TU U 28.1-38136281-001:2014 (registered by the Ministry of Industrial Policy of Ukraine)
•  State Sanitary-Epidemiological Conclusion №05.03.02-07/1806
•  Conforms to:
  • TR CU 010/2011 – Machinery Safety
  • TR CU 004/2011 – Low Voltage Equipment Safety
  • TR CU 020/2011 – Electromagnetic Compatibility
•  Declaration of Conformity: ТС № RU Д-UA.AУ04.В.15746
•  Permission from Gospromnadzor of Belarus №11-1-329-2013 for manufacturing and use at GPN RB facilities