ARO CF Bearing Series Pump for Data Centers

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Long‑life oil‑lubricated bearings for dependable uptime

The ARO CF Bearing Series pump for data centers is a line of single‑stage, horizontal centrifugal pumps with axial inlet, designed in conformity with UNI EN 22858 standards.
It supports reliable circulation of clear or slightly cloudy liquids with RN/RNS closed‑impeller hydraulics, and offers RKNS recessed impeller options for heavier‑duty, no‑clog service when fluids carry suspended solids or fibers.
Built around oil‑lubricated rolling‑contact bearings, a heavy‑duty shaft, and a rugged back pull‑out bearing support, this platform is engineered to keep maintenance predictable—an essential buying criterion for mission‑critical data center operations.

Key performance highlights include:

Maximum casing pressure: up to 16 bar (232 psi)
Liquid temperature range: −50 to +280 °C (−58 to +536 °F)
RN/RNS maximum capacity (flow): up to 2600 m³/h (11,450 US GPM)
RN/RNS maximum head: up to 140 m (459 ft)
Nominal discharge nozzle sizes (DN): RN/RNS DN 32 to 300 mm; RKNS DN 32 to 50 mm

A “process grade” pump platform built for data center reliability

In a data center, pumping is not just about moving water—it’s about protecting uptime. The ARO CF Bearing Series brings chemical‑process design discipline into data center utility and cooling ecosystems: robust mechanics, efficient hydraulics, and serviceability features that reduce operational risk. This pump family is defined as single‑stage horizontal centrifugal pumps with axial inlet, built to UNI EN 22858, and designed around a combination of innovative components to achieve high fluid‑dynamic efficiency.

A major differentiator for long‑run reliability is the use of rolling‑contact bearings with oil lubrication, selected for long life and high reliability.
The heavy‑duty pump shaft is engineered to minimize deflection and support “perfect seal” operation—critical when your data center depends on stable flow and leak‑free operation.
For many configurations, the shaft is also protected from the conveyed liquid to help prevent corrosion and enable the use of high‑performance mechanical materials.

Product family: choose the right hydraulic for your loop

RN / RNS (closed impeller): intended for conveying clear or slightly cloudy liquids (chemically inert or aggressive) and designed to deliver high efficiency and strong performance.
- RKNS (recessed open impeller): designed for solutions with suspended crystals, muddy and/or viscous liquids, and fluids with suspended particles or fibrous materials—promoted as no‑clog service.

Oil‑lubricated rolling‑contact bearings for long service life and high reliability
Heavy‑duty shaft for low deflection and better seal performance
Protected shaft (by support configuration) to reduce corrosion exposure
Back pull‑out bearing support to simplify maintenance activities
Trapezoidal volute casing (RNS) to reduce hydraulic losses and improve efficiency
Impeller anti‑unscrew device for mechanical security in continuous operation
Seal‑area shaft deflection < 0.05 mm (for specified versions) to support seal life
Optional reinforced bearing support per ISO 5199 on request

Benefits for Data Center Operators

Predictable maintenance: the back pull‑out system is specifically designed to make maintenance easier—valuable when your data center has narrow service windows.
Efficiency where it counts: the RNS trapezoidal volute is designed to reduce losses and increase pump efficiency, supporting energy‑focused facility goals.
More flexibility across loops: RN/RNS for clear/slightly cloudy liquids; RKNS for no‑clog duty where contamination risk is higher.
Seal protection options: multiple seal system configurations help you align leakage control and reliability with your site standards.

Typical Data Center Applications

Closed‑loop circulation of clear or slightly cloudy liquids in utility and process loops (RN/RNS).
Water treatment and auxiliary plant services supporting data center operations (the brochure lists water and wastewater applications as common use cases).
Loops where suspended solids or fibrous contamination may appear (RKNS “no clogging”).
High‑reliability services where maintenance simplicity is a procurement priority (back pull‑out support).

Accessories and Options

Single mechanical seal: no flush (Plan 02), lubricated by pumped liquid (Plan 11), or external flush (Plan 32).
Single mechanical seal with rear quench: with or without discharge flush (e.g., Plan 11/62 or Plan 02/62).
Single seal with quench + non‑sparking shaft sleeve: options like Plan 11/61 or Plan 02/61.
Double mechanical seal: external clean flush (Plan 54) or closed circuit with pumping device (Plan 53), including tandem and cartridge solutions.
Soft packing seal options.
Special configurations may be available on request, including cooled seal housing, heated casing and seal housing, and vertical versions.

Pump design: single‑stage, horizontal centrifugal pump with axial inlet
Standards: designed in conformity with UNI EN 22858
Hydraulic variants: RN/RNS (closed impeller), RKNS (recessed open impeller)
Maximum casing pressure: up to 16 bar (232 psi)
Liquid temperature: −50 to +280 °C (−58 to +536 °F)
RN/RNS operating limits:
- Maximum capacity (flow): up to 2600 m³/h
- Maximum head: up to 140 m (459 ft)
- Nominal outlet DN range: 32 to 300 mm
- Flange drilling: UNI PN 16
RKNS operating limits:
- Maximum capacity (flow): up to 110 m³/h
- Maximum head: up to 60 m (197 ft)
- Nominal outlet DN range: 32 to 50 mm
- Flange drilling: UNI PN 16
Performance tolerances: UNI EN ISO 9906 Grade 1 (operative fields)
Bearings: rolling‑contact, oil‑lubricated
Maintenance concept: back pull‑out bearing support

ARO Pumps for Data Centers

FAQ

Yes—because the features that matter most in data centers are reliability and maintainability. The CF Bearing Series is built around oil‑lubricated bearings, a heavy‑duty shaft, and a back pull‑out support designed to simplify maintenance.
For many data center loops that circulate clear or slightly cloudy liquids, the RN/RNS closed‑impeller design is an excellent match to the stated fluid suitability.

Back pull‑out construction is intended to make maintenance operations easier by enabling service access from the rear—supporting faster interventions and more predictable downtime planning.
In data centers, that means you can align pump service with scheduled maintenance windows and reduce disruption to critical cooling or utility loops.

Choose RN/RNS when your data center loop carries clear or slightly cloudy liquids and you want closed‑impeller efficiency and performance.
Choose RKNS when you want added protection against clogging because the fluid may contain suspended particles, crystals, or fibers—RKNS is described as suitable for these conditions “without any problems of clogging.”

There are multiple seal system arrangements, including single mechanical seal options (Plan 02/11/32), single with quench variants (Plan 11/62 or 02/62), and double mechanical seal systems (Plan 53 or Plan 54) including tandem and cartridge solutions.
This range helps you align the pump with site standards for leakage control, reliability, and maintenance strategy—especially important for mission‑critical facilities.

At a minimum, confirm your loop’s pressure and temperature are within the pump’s published ranges: up to 16 bar (232 psi) and −50 to +280 °C (−58 to +536 °F).
Then use the RN/RNS or RKNS operating limits (flow/head ranges) to select the correct size and impeller type for your duty point.

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ARO CF Bearing Series Pump for Data Centers

Long‑life oil‑lubricated bearings for dependable uptime

Overview

A “process grade” pump platform built for data center reliability

Features

Benefits for Data Center Operators

Typical Data Center Applications

Accessories and Options

Specifications

Downloads

ARO Pumps for Data Centers

FAQ

Is this pump family truly suitable for data center use?

How does “back pull‑out” reduce operational risk?

Which model should I choose: RN/RNS or RKNS?

What seal options can help meet data center reliability expectations?

What operating limits should I validate before specifying?

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