Centrifugal Process Pump

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Centrifugal Process Pump Range, built according to ISO 2858/5199 Norms:

The modular RD (Closed Impeller) & RG (Open Impeller) Series of Centrifugal Pumps are unified with the same hydraulic components, built in accordance with ISO 2858 Chemical & ISO 5199 Mechanical Norms. ISO 5199 defines the maximum allowable shaft deflection, mechanical resistance and ball bearing minimum lifetime, ensuring that pumps built to this standard offer excellent reliability in Industrial and Chemical applications. Surpassing those built to EN 733 standards.

The main aspects of this series are the modularity of design, interchangeability of parts, wide sealing system choices but also hydraulic design interchangeability (ability to mount both Open and Closed Impellers on the same pump casing) and the ability to pump under low NPSHa conditions. These features allow the Centrifugal Pump to be easily employed in applications with aggressive chemicals, suspended solids, high temperatures, high viscosities and high specific gravities.

The RC Series of Single Stage End Suction Centrifugal Pump feature a Vortex Impeller which is recessed into the back of the pump casing. This means they are ideally suited for soft pumping applications or with high solids content (up to 180mm ø free passage) as most of the fluid passes through the Centrifugal Pump without any direct contact with the impeller. This ensures that crystals, delicate solids (such as peas, corn, beans, olives, seeds, granules), flakes of biological mud, leather parts etc… can be conveyed without damage and do not come into contact with the mechanical seal.

Furthermore, long filamentous solids can pass through the Centrifugal Pump without any damage. The Vortex Impeller is also able to pump entrained gases up to 50% in concentration with the fluid. For this reason, these pumps can be used in applications where the fluid has difficulties in getting to the suction port and are a great solution for the transfer of viscous fluids up to 1000 cPs.

Features and Benefits:

RD & RG Centrifugal Pump range:

  • Modularity: 3 Bearing Housing & Shaft Groups covering 35 different pump sizes.
  • Efficiency: Investment Cast Impellers for high hydraulic efficiencies, open impellers have efficiencies similar to closed impellers.
  • Flexibility: 2 Impeller types can be installed in the same casing & 14 different sealing systems can be fitted into the same casing cover.
  • Uses: Closed Impellers for clean fluids, open impellers for non-abrasive solids, liquids with dissolved gases and critical suction conditions.

RC Centrifugal Pump range:

Free passage of large solids: The recessed impeller ensures the passage of the solids and filamentous materials equal to 90% of the delivery port. Long and filamentous solids pass through the pump without clogging or causing damage.

Resistance to wear: Higher abrasion resistance is achieved as the pump casing has been designed to pump liquids together with suspended solids even if abrasive. Surface continuity avoids to the presence of clogging and all wearing points have been properly shaped.

One casing cover fits 14 different sealing systems: Only 1 Casing Cover is used for every size of pump and it can fit every seal type, brand and seal arrangement! The Seal Chamber, which is cylindrical, has dimensions bigger than those suggested by ISO 5199 Norms to grant the best circulation of fluid. Different seal types can be used using limited components, so it is always possible to change from one execution to another. For example from a Single Mechanical Seal to a Double, Packed Gland or Cartridge, by just replacing a few components. As a result it is easy to modify the pump for a new plant or process requirement in a fast and cost effective manner. Furthermore, this modular system allows limited stock holding of spares to cover the whole pump range.

Typical applications of the RC Centrifugal Pump range:

  • Food Industry: To transfer liquids with suspended solids such as fruits & vegetables, sludges, stones, grass etc…
  • Sugar Industry
  • Water Treatment Industry: To transfer liquids with suspended solids and filamentous fluids such as biological sludge, flocculated sludge, clarifier waste.
  • Biogas Plants
  • Chemical Industry: For crystallizers, transfer, washing and solids or high viscosity substance recovery
  • Textile & Tanning Industry: For chemical baths with suspended solids and filamentous fluids.

Centrifugal Process Pump Range:

Robuschi RD, RG, RB & RC Impeller models

Discharge Sizes

DN32 – DN125

Discharge Sizes

DN32 – DN125

Discharge Sizes

DN65 – DN300

Discharge Sizes

DN32 - DN250

Max Flow

500 m³/hr

Max Flow

300 m³/hr

Max Flow

2400 m³/hr

Max Flow

800 m³/hr

Max Head

140 m

Max Head

95 m

Max Head

70 m

Max Head

60 m

Max Temp

220ºC

Max Temp

220ºC

Max Temp

220ºC

Max Temp

180ºC

Materials, Std.

AISI 316

Materials, Std.

AISI 316

Materials, Std.

C.I. GJL250

AISI 316

Free Passage

Up to 150 mm

Materials, on request

AISI 304 & 904

Materials, on request

AISI 304 & 904

Materials, on request

AISI 304 & 904

Materials, Std.

C.I. GJL250

AISI 316

Duplex

Duplex

Duplex

Materials, on request

AISI 304 & 904

Super Duplex

Super Duplex

Super Duplex

Duplex

Hastelloy B

Hastelloy B

Hastelloy B

Super Duplex

Hastelloy C

Hastelloy C

Hastelloy C

Hastelloy B & C

Sealing

Cylindrical Chamber acc. to EN 12756 which can fit up to 15 different seal arrangements (Single, Double Back to Back, Double Tandem, Packing Gland & Cartridge) & API Flushing Plans acc. to API 682 (e.g. Plan 11, 52, 53 & 54)

Configurations

All the above pumps are also available in Vertical Immersion (up to 6 m) and Sealless Cantilever Sump (up to 1.8 m). As well as the following:

robuschi examples

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