Grundfos CRN Vertical Pumps

Q: How do I choose the right CRN size?

Size it on flow against head, never flow alone — the size number is the nominal flow in m³/h, so a CRN 32 is a 32 m³/h pump, and the number of stages then sets the head at that flow. Give us your design flow, your total head in metres, and the liquid and its temperature, and we confirm size, stage count and motor kW off the curve.

Q: Why choose a CRN over a cast iron pump like the NBG?

Because every wetted part is AISI 316 stainless steel. That is what makes it suitable for seawater, acids, alkalis and reverse osmosis duty, where a cast iron end-suction pump would corrode.

Q: Is it suitable for seawater?

Yes — the all-stainless AISI 316 wetted path is the reason the CRN is specified for seawater and other aggressive liquids. Tell us the temperature and chloride level so we can confirm the seal and shaft build.

Q: Can it handle hot liquid?

Standard build runs −20 to +120 °C, and larger models start at −30 °C. With the air-cooled top and its special shaft seal chamber it will handle up to 180 °C at a maximum of 25 bar.

Q: What connections does it take?

CRN 1s to 20 use a DN 25/32 flange or a PJE coupling in R 1¼ / DN 32; CRN 32 to 64 use DN 65–100 flanges or PJE couplings in 3″ to 4″.

Q: Can I run a CRN on a variable speed drive?

Yes — a Grundfos CUE external drive suits the CRN and lets you trim flow to demand, which cuts running cost sharply on a pump that runs long hours.

Q: How do I get a price?

Send us your duty point in flow and head, the liquid, its temperature and your supply details, and we will quote the right CRN build and confirm lead time.

Stainless steel vertical multistage pumps for high-pressure seawater and process water duty.

Categories: Centrifugal Pumps, Water Pumps

Applications: Live Holding & Purging, Public Aquarium, RAS, Water & Wastewater Treatment

Brand: Grundfos

Product Information

Key Features

Vertical in-line multistage centrifugal pump, available across a wide spread of flow and pressure sizes from CRN 1s up to CRN 150, with motors from 0.37 to 75 kW across the series
All wetted parts in AISI 316 stainless steel (EN 10088 1.4401) — pump head, impellers, chambers, sleeves and base — with duplex stainless 1.4462 shafts on the larger models. That full stainless build is precisely why the CRN, rather than a cast iron end-suction pump, is the one to specify for seawater and for acid, alkali and other chemical duty
Three published duty points at the larger end: CRN 32 gives 32 m³/h against 15–40 m, CRN 45 gives 45 m³/h against 22–58 m, and CRN 64 gives 64 m³/h against 30–85 m
Built for ultra-filtration and reverse osmosis, distillation systems, swimming baths, oils, alcohols, acids and alkalis, machine tool coolants and general process water
Liquid temperature −20 to +120 °C as standard, and an air-cooled top with a special shaft seal chamber takes it to 180 °C at a maximum of 25 bar
Maximum operating pressure 10 to 33 bar depending on model, with flange connections DN 25/32 on the smaller sizes and DN 65–100 on the larger ones, or PJE couplings as an alternative
Minimised pressure loss and lower NPSHr improve hydraulic efficiency and overall pump performance, and allow a compact, space-saving system layout
Sizing: a CRN is selected on flow against head, never flow alone. The size number is the nominal flow in m³/h — a CRN 32 is a 32 m³/h pump — and the number of stages then sets the head it will make at that flow. Send us your design flow in m³/h and your total head in metres, plus the liquid, its temperature and the line pressure, and we will confirm the size, stage count, motor kW and seal build off the pump curve.

Specifications

Model	Nominal flow (m³/h)	Head at nominal flow (m)	Motor power (kW)	Connection	Materials / notes
CRN 1s	0.8	Not published in the datasheet — confirmed off the curve at selection	0.37–1.1	Flange DN 25/32, or PJE coupling R 1¼ / DN 32	All wetted parts AISI 316 stainless steel (EN 10088 1.4401)
CRN 1	1	Not published in the datasheet — confirmed off the curve at selection	0.37–2.2	Flange DN 25/32, or PJE coupling R 1¼ / DN 32	All wetted parts AISI 316 stainless steel (EN 10088 1.4401)
CRN 3	3	Not published in the datasheet — confirmed off the curve at selection	0.37–3	Flange DN 25/32, or PJE coupling R 1¼ / DN 32	All wetted parts AISI 316 stainless steel (EN 10088 1.4401)
CRN 5	5	Not published in the datasheet — confirmed off the curve at selection	0.37–5.5	Flange DN 25/32, or PJE coupling R 1¼ / DN 32	All wetted parts AISI 316 stainless steel (EN 10088 1.4401)
CRN 10	10	Not published in the datasheet — confirmed off the curve at selection	0.37–7.5	Flange DN 25/32, or PJE coupling R 1¼ / DN 32	All wetted parts AISI 316 stainless steel (EN 10088 1.4401)
CRN 15	15	Not published in the datasheet — confirmed off the curve at selection	1.1–15	Flange DN 25/32, or PJE coupling R 1¼ / DN 32	All wetted parts AISI 316 stainless steel (EN 10088 1.4401)
CRN 20	20	Not published in the datasheet — confirmed off the curve at selection	1.1–18.5	Flange DN 25/32, or PJE coupling R 1¼ / DN 32	All wetted parts AISI 316 stainless steel (EN 10088 1.4401)
CRN 32	32	15–40	1.5–30	Flange DN 65–100, or PJE coupling 3″–4″	AISI 316 wetted parts; duplex stainless 1.4462 shaft on larger models
CRN 45	45	22–58	3–45	Flange DN 65–100, or PJE coupling 3″–4″	AISI 316 wetted parts; duplex stainless 1.4462 shaft on larger models
CRN 64	64	30–85	4–45	Flange DN 65–100, or PJE coupling 3″–4″	AISI 316 wetted parts; duplex stainless 1.4462 shaft on larger models
CRN 90, 120 and 150	Available in the range	Not published in the datasheet held by Fresh By Design	Series maximum 75 kW	Confirmed at selection	AISI 316 wetted parts; duplex stainless 1.4462 shaft
Max operating pressure	—	—	—	—	10 to 33 bar depending on model
Liquid temperature	—	—	—	—	−20 to +120 °C standard, −30 to +120 °C on larger models. Air-cooled top with a special shaft seal chamber handles up to 180 °C at a maximum of 25 bar
Electrical supply	—	—	—	—	Three-phase 50/60 Hz at 220–240 / 380–415 V or 380–480 / 660–690 V; single-phase 220–230 V or 240 V on 0.37–2.2 kW motors
Ambient limits	—	—	—	—	Maximum ambient +40 to +60 °C depending on motor; maximum altitude 1000 to 3500 m above sea level

Downloads

Grundfos CR, CRI, CRN Installation and Operating Instructions Grundfos CR, CRI, CRN 50 Hz Product Datasheet

Frequently Asked Questions

How do I choose the right CRN size?

Why choose a CRN over a cast iron pump like the NBG?

Is it suitable for seawater?

Can it handle hot liquid?

What connections does it take?

Can I run a CRN on a variable speed drive?

How do I get a price?

Spare Parts & Consumables

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Grundfos CRN Vertical Pumps

Product Information

Key Features

Specifications

Downloads

Frequently Asked Questions

Spare Parts & Consumables

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