Pumps type D (VS1 design) and P (VS3 design)
D pumps (VS1 design) and P pumps (VS3 design) are vertical, single- or multi-stage diagonal D pumps and single-stage P propeller pumps in single- and double-ceiling versions. Designed for pumping clean water or water with small amounts of impurities at temperatures up to 60 °C.
The (D, P) range is available in API-free versions for power plant requirements and general industrial specifications and in the API 610 version (VS1 type) for the oil and gas industry and the ATEX Directive 2014/34/EU (in the scope of Group II, category 2G and 3G).
Layout & Construction Principles
Vertical Diagonal & Axial Flow
Vertical, with diagonal (VS1) or axial (VS3) flow, with a suction funnel immersed in the pumped liquid, or with a stub connected with an expansion joint to the inlet channel.
Heavy-Duty Thrust & Shaft Guidance
The pumped liquid flows through the hydraulic unit and then through a vertical pipe column to the pump outlet elbow along a shaft guided in radial plain bearings (shells) lubricated with the pumped liquid. The thrust forces are transmitted by an oil-lubricated, spherical or Michell type thrust bearing.
Operating Limits & Specifications
Standards & Certifications
Applicable Standards
API 610 / ISO 13709
Last editions
Full compliance with the latest edition of API 610 (ISO 13709) standards for vertical VS1 & VS3 pumps.
ANSI / ASME & DIN / EN
Connection stubs
ANSI/ASME (#75) or DIN/EN (PN6; PN10; PN16) connection stubs engineered to station specifications.
API 682 Mechanical Seals
Latest edit
Accommodates mechanical seals and stuffing box designs according to API 682 latest edition.
ATEX Directive
2014/34 / EU
Certified under ATEX Directive 2014/34/EU in the scope of Group II, category 2G and 3G.
Product Features & Key Highlights
They are certified by the National Institute of Hygiene
Possibility of pumping drinking water with verified hygienic safety compliance.
Very long pump life
Extremely durable construction designed for continuous operation lasting even several dozen years.
Hydraulics optimization
Engineered hydraulic profiles designed to maximize pump efficiency across large volume demands.
Shafts protected with protective sleeves
In the area of the stuffing box and plain bearings - optimal and long-lasting operation of bearings and mechanical seals.
Stuffing boxes
Compatible with seal cooperation according to API682, latest edition.
API 610 / ISO 13709
Full compliance with the latest edition of worldwide standards for oil, gas, and power specifications.
Possibility of adapting pump to existing pumping stations
Flexible modular pump length from about 1.5 meters to several meters to fit existing civil infrastructure.
Freely immersing inlet hopper in pumped medium
They do not require supplying the pumped liquid via a suction pipeline, drastically reducing plant footprint.
Dry start capability
Possibility of starting the pump without first wetting the bearings for reliable emergency response.
Material Versions (API 610 Table H.1)
API material classes for D (VS1) and P (VS3) vertical pumps:
| Part name | S-5 | S-6 | S-8 | C-6 | A-8 | D-1 and D-2 |
|---|---|---|---|---|---|---|
| Pump body/interstage ring | CS | CS | CS | 12%CR | 316L AUS | Duplex/Super Duplex |
| Rotor / vanes | CS | 12%Cr | AU$316 | 12%CR | 316L AUS | Duplex/Super Duplex |
| Sealing ring | 12% CR+H | 12% CR+H | 316 AUS+HF | 12% CR+H | 316L AUS +HF | Duplex / Super Duplex + H |
| Shaft | AISI 4140 | 12%CR | 316L AUS | 12%CR | Duplex | Duplex/Super Duplex |
| Bearing housing | CS | CS | CS | CS | CS | CS |
Legend: CI – Cast iron; CS – Cast steel / carbon steel; AISI 4140 – alloy steel; 12% CR – cast steel / chrome steel; 316 AUS – Cast steel / austenitic steel >2% Mo; +H – hardened; +HF – hard faces.
* Possibility of making other alloys, including NACE-compliant materials.
Application Examples
Wherever high performance at a relatively low lifting height is required:
Order or request sizing for D (VS1) and P (VS3) pumps
Geomatics Middle East is the official dealer of Grupa Powen in Oman. Contact our engineering team for pit dimensioning, pump curves, and competitive quotations.