grundfos crn air-cooled top -...

Grundfos CRN Air-Cooled Top

High temperature operation

In industries where pumping of very hot liquids is crucial for a

successful production, it is important that the pumps are able

to deal with these high liquid temperatures. Our clients have

taught us that no shaft seal can tolerate very hot liquid tempera-

tures. Often, productions are put to unexpected standstills due

to the fact that the shaft seal has to be replaced because it has

been exposed to very high temperatures.

Therefore, Grundfos has designed the CRN Air-Cooled Top;

a pump with a standard mechanical shaft seal that can handle

liquid temperatures of up to 180°C and at the same time can

deliver a high pressure. As the name implies, the pump has an

air-cooled top that separates the pumped liquid from the shaft

seal and prevents it from overheating.

GRUNDFOS CR RANGE

www.grundfos.com

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Custom-built solutions

The comprehensive standard Grundfos CR programme covers

a wide range of pumps, for a wide range of different industrial

applications. Besides, Grundfos designs custom-built pump so-

lutions; acknowledging that sometimes it does not take more,

than a little extra effort, to come up with the right solution.

With a custom-built pump solution from Grundfos, your pump

is capable of handling even higher pressures, more aggressive

liquids, excessive liquid temperatures etc.

Advantages and the CRN Air-Cooled Top

Worldwide pump supplier

Being a worldwide pump supplier, Grundfos has committed

itself to provide its clients with a global, reliable and efficient

service network. Our experienced team of service technicians

are always ready to serve you wherever in the world you are and

– of cause – at a short notice – whenever you need it.

Technical data

Max. pressure 40 bar

Max. ambient temp. 40°C

LiquidsAny liquids handled by Grundfos CRN pumps

Min. inlet pressureNo change from standard CRN

Min. flowNo change from standard CRN

Air-cooled Top

The Grundfos CRN Air-Cooled Top is specially designed to han-

dle hot liquids; i.e. 120°C - 180°C. To make sure that the liquid

temperature around the shaft seal does not exceed the level it

can withstand, the pump is fitted with a special air-cooled shaft

seal chamber generating the same insulation effect as the one

of a thermos. To cool the pump, no external cooling is neces-

sary; the ambient temperature is sufficient.

Long lifespan of shaft seal

The lifespan and efficiency of a shaft seal depends on the na-

ture of the pumped liquid and of its temperature. Because of

the CRN Air-Cooled Top pump’s unique construction, the pump

is able to withstand high temperatures over a long period of

time. The pump is available with different rubber qualities spe-

cially designed to cope with excessive wear and to provide long

life under extreme operating conditions.

Reliability above all

The Grundfos CRN Air-Cooled Top pump has been subject to

thoroughly testing among others in boiler feed applications

dealing with hot liquid temperatures. Therefore, the pump is a

highly reliable partner 24 hours a day.

Sectional drawing

Air vent

Air chamber

Liquids

Shaft seal

Being responsible is our foundationThinking ahead makes it possible

Innovation is the essence

ATEX approved CR pumps

Grundfos CR in hazardous areas

A new European directive, called the ATEX directive, comes into

effect July 2003. The directive, (94/9/EC), deals with electrical,

mechanical, hydraulic or pneumatic equipment in areas exposed

to explosive atmosphere. Explosive atmosphere consists of air

and some sort of combustible material such as gas, dust or

vapour. So, to prevent explosions from occurring, and thereby

higher the standard of safety in the risk areas, manufacturers

of this type of equipment have to comply with the basic safety

requirements stated in the new directive.

The safety requirements in the ATEX directive implies that

pumps have to carry a clear indication of which equipment

group and category, they belong to, and in what areas they can

be used. All the pumps in the Grundfos CR ATEX range comply

with the requirements in the directive. The ATEX directive af-

fects a wide range of industries, dealing with the handling of

cereals, animal feed, paper and wood industries that generate

combustible dust. Likewise the directive affects industries that

deal with the handling of chemicals, plastics and petrol, that is

industries that generates explosive gasses.

GRUNDFOS CR RANGE

www.grundfos.com




applications. Besides, Grundfos designs custom-built pump

solutions; acknowledging that sometimes it does not take more,





The ATEX approved CR pumps and motors carry a mark that

shows which explosion category the pumps are designed for,

and thus, in what kind of areas they can be used. The directive

distinguishes between two explosion groups; group I and II.

Whether it is a group I or II pump, depends on the level of danger

of explosion in the area in which the CR pump is installed.







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CR in hazardous areas

Group 1

Category M2

Underground installations in mines with danger of

explosive gasses or combustible dust.

Pumps made of materials that do not create sparks and

thereby do not make any danger of explosion.

CR pumps CR/CRI/CRN

Motors None

Group 2

Category 2 Category 3

Installation in areas with

risk of explosion because

of presence of explosive

atmosphere.

Pumps made for areas where explosive

atmosphere is likely.

Pumps made for areas where explosive

atmosphere is rare.

G (gas) D (dust) G (gas) D (dust)

CR pumps CR/CRI/CRN* CR/CRI/CRN/CRT CR/CRI/CRN/CRT CR/CRI/CRN/CRT

Motors VEM 2G EEx e IICT3

CEMP 2G EEx d IIB T4

VEM 2D 125 C VEM 2G EEx e IICT3

CEMP 2G EEx d IIB T4

VEM 3D 125 C

* Magnetic drive, Double shaft seal – Back to back or Tandem



Grundfos CRN Double Shaft Seal

Aggressive or dangerous liquids

In industrial applications that involve toxic, aggressive or even

explosive liquids, leak-free pumping is top priority. Pumps that

leak these kinds of liquids make up a considerable risk for the

environment in which they operate, and for the people working

close to them, and are therefore not safe for that kind of appli-

cations. Years of close cooperation with our customers, have

taught us that the traditional CR shaft seal solution is unsuit-

able for dealing with media like that.

Therefore, Grundfos has developed the CRN Double Shaft

Seal; a 100% leak-free pump. With the CRN Double Shaft Seal,

Grundfos has designed a pump with two shaft seals mounted

in a back-to-back arrangement in a pressurised seal chamber,

that prevents the pump from leaking.

GRUNDFOS CR RANGE

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Advantages and the CRN Double Shaft Seal

Technical data



Max. liquid temp. 120°C

Min. inlet pressureNo change from standard CRN

Min. flowNo change from standard CRN

No Leakage

Because of the double shaft seal construction, liquids are pre-

vented from penetrating into the shaft seal’s working environ-

ment and damage it. Evidently, the most important advantage

of this construction is that whether it is a toxic, aggressive or

explosive liquid that the pump is handling, the liquid stays

where it is supposed to - inside the pump.

Safety

The fact that the CRN Double Shaft Seal does not leak, lead to

another advantage that comes with this pump. The working

environment is safe when the risk of leak of toxic or explosive

media is eliminated. Because of the CRN Double Shaft Seal,

people working close to the pumps do not need to fear for their

own safety. No leak, no risk of pollution.

Longer lifespan of shaft seal

With the CRN Double Shaft Seal, the pumped liquid is not in

direct contact with the shaft seal. Especially, in applications

dealing with particles or sticky liquids such as paint, the double

shaft seal is not exposed to excessive wear, and has a longer

lifespan than a traditional shaft seal has.

Sectional drawing

Two tungsten/carbide seal faces make up the double shaft seal mounted in a “back to back” arrangement. The pressure between the two shaft seals is either created by a pressure intensifier or a separate pump, such as e.g. a dosing pump.

Pressurised

seal

champer

Shaft seal



CR efficiency 1 motors

High efficiency operation

Today, pumps consume some 20% of the total electric power

used in the industry. In the light of the continuously growing

concern about the environment, the EU has come up with an

agreement, the CEMEP agreement. The aim of the agreement is

to reduce harmful impact on the environment by putting em-

phasize on how to increase savings on electricity at the same

time as making pumps and motors more efficient. Generally,

the CEMEP agreement is considered as the world standard for

high efficiency motors. According to the agreement, motors are

divided into the following three efficiency groups:

– Eff1 - Highest efficiency

– Eff2 - Middle efficiency

– Eff3 - Lowest efficiency

All the pumps in the Grundfos CR range are available with high

efficiency Eff1 motors. Being an environmental responsible com-

pany, Grundfos attach great importance to supply clients with

low energy consuming products that meet the strict demands

stated in the CEMEP agreement.

GRUNDFOS CR RANGE

www.grundfos.com
















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Advantages and the CR Eff1 motorsHigh efficiency

The division of efficiency into groups is an expression of how a

motor consume a minimum of electrical power while keeping

a high level of performance. The consequence of reducing the

motor’s energy consumption is lower operating costs; clearly a

crucial factor for the manufacturing industry.

Low noise

Normally, the cooling fan is the part of the pump that makes

the most noise. With the Grundfos CR Eff1 motor, less cooling

air is necessary to maintain a stable low motor temperature,

because the efficiency is high. Therefore, the size of the cooling

fan is smaller, and thus do not make much noise.

Higher ambient temperature

Because of the motor’s construction, the temperature of the

Grundfos CR Eff1 motor is quite a bit lower than the one of a

conventional motor. That is why the CR Eff1 motor is suitable for

applications located in areas with ambient temperatures above

40°C. When the CR Eff1 motor is located in areas with ambient

temperatures below 40°C, the Cost of Ownership is reduced

because the temperature of bearings and insulation system are

reduced and their lifespan, thus, longer.

Esaving = Energy savings per year

P2 = Nominal power output – in the example 4.0 kW

Trun = Running time – in the example 2,500 h/year

Pload = Percentage of full load – in the example 90%

ηnew = Efficiency of new motor – in the example Grundfos Eff1

ηold = Efficiency of replaced motor – in the example Grundfos Eff2

Esaving = P2* Pload* trun* (1 / ηold - 1 / ηnew)

Example: Esaving = 4.0* 0.90* 2,500* (1 / 0.86 - 1 / 0.89) = 353 kWh/year

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Output power [kW] Grundfos Eff1 Motors

Efficiency [%]

Sectional drawing



Grundfos LiqTec

Dry running protection

In the industry, the most frequent cause of pump breakdown

is dry running. Not only is dry running a cost-consuming affair,

because production is put to an immediate standstill. In many

cases, it also ruins pump parts such as the shaft seal and the

bearing systems. Over the years, our clients have asked our ad-

vice to prevent dry running from happening.

Therefore, Grundfos has developed the LiqTec; an electronic

anti-dry running sensor. If the LiqTec senses no liquid in the

pump, it stops the pump at once before any damage is done,

reducing the risk of breakdown by 50%.

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Advantages and the LiqTec







Easy installation

With LiqTec, Grundfos has made an indispensable device that is

easy to mount on all the pumps in the Grundfos CR range. The

sensor is inserted via the pump head, close to the shaft seal.

Once the electronic sensor LiqTec is plugged in, the power is

turned on and the control unit monitors the whole system.

Automatic restart

The LiqTec sends heat impulses through a sensor and measures

the temperature of the sensor. If the sensor does not detect

liquid in the pump, the pump is stopped. When the sensor

detects liquid in the pump again, the pump is restarted either

manually or automatically.

Like a PTC relay

The Grundfos LiqTec can also be connected to the pump’s ther-

mistor. The thermistor disconnects the circuit if the motor’s

temperature exceeds a certain level preventing it from over-

heating.

Sectional drawing Technical data




Power supply 1x200 - 240 V - 50/60 Hz

Power consumption 5 W

Humidity 99%

Cable length 5 m / 20 m

LiquidsAny liquid handled by Grundfos pumps

Motor PTC sensor

Digital reset

Sensor

Supply

Alarm Run

Product numbers Dimensions

Complete unit 96443674

Sensor unit service kit 96443675

Extra cable kit 96443676

Patent pending.



Grundfos CRN Low NPSH

High temperature - poor inlet conditions

In industrial applications where pumps have to deal with the

combination of high liquid temperatures and difficult inlet con-

ditions or poor inlet pressure, the steady and reliable operation

is often jeopardised by cavitation. Many years of collaboration

with our customers in the industry, has taught us that it takes

a special pump to deal with cavitation in industrial applications

in order to avoid broken pumps and damaged systems.

Therefore, Grundfos has developed the CRN Low NPSH; a pump

that is specially designed to eliminate the risk of cavitation and

ensure a stable and reliable operation.

GRUNDFOS CR RANGE

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Advantages and the CRN Low NPSHStable operation

The CRN Low NPSH is a standard pump with an oversized inlet

impeller and chamber that improve the pump’s suction capa-

bilities. This construction prevents erosion from occurring and

destruction of pump parts such as the impeller, piping system

or valves from taking place. Additionally, the pump does not

produce as much noise as a traditional CR does. Despite the fact

that the CRN Low NPSH is subject to higher amount of stress

than traditional pumps because of its improved inlet design,

it ensures a stable operation.

Compact system design

Because of the CRN Low NPSH, it is possible to design a more

compact system; that is a system that does not take up too

much room. The CRN NPSH reduces the excess pressure itself,

and do not require any additional tank to provide supplementary

pressure. In boiler feed applications, where many big tanks are

gathered, a compact system is an advantage.

Longer lifespan

By eliminating the risk of cavitation, the CRN Low NPSH pro-

vides a more stable flow for a longer period of time. The pump

is no longer subject to the damage that cavitation causes on

different pump parts, and is ensured a considerable longer

lifespan than a traditional pump.

Technical data




Min. inlet pressureNo change from

standard CR/CRN

Min. flowNo change from

standard CR/CRN

Sectional drawing

Special chamber

Special

impeller



Grundfos CRN MAGdrive

Hermetic sealed pump operation

In industries where pumping of dangerous and aggressive

liquids is an integrated part of the daily operation, safety is top

priority. Pumps that leak are dangerous for their surroundings

and neither suitable nor safe for handling that kind of liquids.

Years of close cooperation with our clients in the industry, has

taught us that the traditional CR shaft seal solution, is unsuit-

able for the handling of aggressive liquids.

Therefore, Grundfos has developed the CRN MAGdrive; a ver-

tical multi-stage centrifugal pump. With the CRN MAGdrive,

Grundfos has designed a sealless pump for industrial applica-

tions, which do not leak. Thanks to the magnetic drive, the

pump is hermetically sealed, and do not present any risk to its

surroundings.

GRUNDFOS CR RANGE

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Advantages and the CRN MAGdriveLeak-free pump

Because of the magnetic drive, the CRN MAGdrive is a hermeti-

cally sealed pump. Obviously, the most noticeable advantage of

such a construction is that the pump does not leak, and thus, is

well suited for the handling of aggressive liquids. Not only does

the CRN MAGdrive ensure stable operation, it also secures the

workplace from escapes of toxic or aggressive media.

Safety above all

With the CRN MAGdrive, Grundfos has designed a completely

new and different multi-stage vertical pump – build upon the

well-reputed CR technology – for high-tech industrial clients.

The CRN MAGdrive does not compromise with safety; on the

contrary! It puts it above all, and ensures maximum safety in

the daily operation in the industry.

Superior quality coupling

The construction of the Grundfos CRN MAGdrive is based on a

standard Burgmann coupling. This is not an incident. Years of

experience and of product development explain the superior

quality of the Burgmann coupling; and thus, of the Grundfos

CRN MAGdrive coupling as well.

Technical data




Min. inlet pressureNo change from

standard CRN


standard CRN

Sectional drawing

Thanks to its leakage-

free, sealless magnetic

drive, the CRN MAGdrive

provides a reliable and

safe solution for manu-

facturers pumping ag-

gressive, volatile media.



CRN High Pressure programme

High pressure programme

In a number of industrial applications within the water treat-

ment industry, (i.e. filtration) and the washing and cleaning

industry, high pressure is decisive for a successful daily produc-

tion. Our close cooperation with clients throughout the years,

has taught us that it takes a special pump to handle very high

system pressure.

Therefore, Grundfos has developed the CRN High Pressure

programme; specially designed to cope with high pressure over

25 bar. With the CRN High Pressure programme, Grundfos has

designed a pump that makes it possible to deliver very high

pressure for a multitude of applications that deal with liquids

from potable water to industrial liquids.

GRUNDFOS CR RANGE

www.grundfos.com


The comprehensive standard Grundfos CR programme covers a

wide range of pumps, for a wide range of different industrial ap-

plications. Besides, Grundfos designs custom-built pump solu-

tions; acknowledging that sometimes it does not take more,











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Advantages and the CRN High Pressure programmeComplete flow range

The CRN High Pressure comes in two variants; as a single pump

solution or as a double pump solution. In applications where a

low flow is key to success, one single pump is installed. Likewise,

in applications, where a large flow is important for a successful

process, two pumps are mounted in series. So, depending on

whether our clients are in need of a high or a low flow, Grundfos

can supply a high-pressure pump solution.

Robust design

The robust construction of the CRN High Pressure makes it

possible for the pumps to handle very high system pressures.

The high-pressure pumps have the same long lifespan as the

other pumps in the CR range despite the fact that they are con-

stantly working under extreme conditions.

CR range

The CRN High Pressure programme is available in all the

CR standard material variants, and can deliver a pressure of up

to 50 bar. In applications where the need of pressure and flow

exceeds what the CR range has to offer, Grundfos has another

solution: Our extensive range of high-pressure boosters, BM

and BME.

Technical data


Max. ambient temp. 40° C

Max. liquid temp. 120° C


standard CRN1 2 3 4 5 6 8 10 20 30 40 50 60 80 100 Q [m3/h]

20

30

40

60

80

100

200

300

400

[m]H

50 Hz

CRNE CRNE 2 x CRN2 x CRN2 x CRN3-HS 32 45 64 901-HS

CRN15-SF

CRN 5-SF

CRN10-SF

CRN 20-SF

2 x CRN



Performance Range

Grundfos CR Pulley-head

Pump solution for distant areas

In applications in remote areas or in mobile applications where

no electric power is available, a special solution is necessary to

make pumps run. Over the years our clients have taught us that

it is indeed very important to be able to supply water in distant

places and in atypical applications such as mobile fire-fighting

facilities.

Therefore, Grundfos has developed the CR Pulley-head pump; a

standard CR pump with a belt-drive. For instance, the Grundfos

CR Pulley-head pump can be powered by either a diesel engine,

a steam-turbine that is mounted next to the pump, and thus do

not take up any further room or by a wind-powered DC-motor.

GRUNDFOS CR RANGE

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Advantages and the CR Pulley-headComplete CR programme

For Grundfos remote areas are not equal limitations; on the

contrary!

The Grundfos CR Pulley-head is available in all the standard CR

product sizes. So, wherever a special flow and pressure is needed,

Grundfos can deliver a Pulley-head solution. And naturally, the

Pulley head comes with the same high product quality, as all

the CR products are known for.

Technical data



LiquidsAny liquid handled by

Grundfos CRN pumps


standard CRN


















Uncompromising reliability

It comes as no surprise that it is key to be able to rely on a

pump’s operation in installations in distant places. In general,

a pump breakdown seldom comes as a pleasant surprise; but a

pump breakdown in a remote area is less than convenient when

service is not within a reasonable reach. Because of its robust

construction the Pulley-head is able to operate constantly under

extreme conditions day after day. With the CR Pulley-head; no

need to worry; the Grundfos CR Pulley-head does not compro-

mise with reliability.

Easy installation and maintenance-free pump

The CR Pulley-head is easy to install. All you need to do is to in-

stall the belt-drive and the pump is ready to run. And, as is the

case for all the Grundfos pumps in the CR range, the CR Pulley-

head requires a minimum of maintenance.

grundfos crn air-cooled top -...

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