Vertical cooling-tower circulation pump

LLT (coaxial)

Coaxial vertical cooling-tower circulation pumps, DN65–DN150

Single-stage, single-suction, non-self-priming vertical pumps with horizontal inlet and outlet, built for large flow at low head. The pump shaft and motor shaft are coaxial, giving a small footprint and light weight. Impeller and pump shaft are stainless steel; the pump body and head are resin-sand cast iron HT200 with a smooth finish.

Large flow, low head: 30–300 m³/h, up to 8.9 m
Liquid temperature -15 to +100 °C, working pressure up to 6 bar
Coaxial structure, small footprint, in-line DN65–DN150 flanges
Cooling-tower and condenser water circulation, unit-equipment cooling

View 9 models Find a pump

Flow: 30–300 m³/h
Head: up to 9 m
Power: 1.1–7.5 kW
Mains: 50 Hz
Models: 9
Liquid temp.: -15 to +100 °C

Sizes

Size	Description	Rated flow	Flow range	Max pressure	Motor	Connection	Models
LLT65	Coaxial vertical cooling-tower circulation pump, DN65	40 m³/h	30–50 m³/h	6 bar	1.1 kW	Flange DN65 PN10 (GB/T17241.6 RF)	1
LLT80	Coaxial vertical cooling-tower circulation pump, DN80	55 m³/h	40–70 m³/h	6 bar	1.5 kW	Flange DN80 PN10 (GB/T17241.6 RF)	1
LLT100	Coaxial vertical cooling-tower circulation pump, DN100	80 m³/h	55–120 m³/h	6 bar	2.2 kW	Flange DN100 PN10 (GB/T17241.6 RF)	2
LLT125	Coaxial vertical cooling-tower circulation pump, DN125	120 m³/h	100–200 m³/h	6 bar	3–4 kW	Flange DN125 PN10 (GB/T17241.6 RF)	2
LLT150	Coaxial vertical cooling-tower circulation pump, DN150	200 m³/h	160–300 m³/h	6 bar	5.5–7.5 kW	Flange DN150 PN6 (GB/T17241.6 RF)	3

Models

Filter by duty point, mains frequency or size. Click a model for its performance curve and data.

Model table (PDF)

Model	Size	Stages	Hz	Motor kW	Flow m³/h	Head m	rpm	kg
LLT65-5/1.1	LLT65	1	50	1.1	30–50	3.1–6.6	2900	32	Curve PDF
LLT80-5/1.5	LLT80	1	50	1.5	40–70	2.8–6.9	2900	39	Curve PDF
LLT100-5A/2.2	LLT100	1	50	2.2	55–100	4.2–5.7	1450	66	Curve PDF
LLT100-5/2.2	LLT100	1	50	2.2	80–120	3.5–6.1	1450	66	Curve PDF
LLT125-5A/3	LLT125	1	50	3	100–180	2.3–5.9	1450	72	Curve PDF
LLT125-5/4	LLT125	1	50	4	120–200	2.7–6.5	1450	83	Curve PDF
LLT150-6A/5.5	LLT150	1	50	5.5	160–250	3.9–6.5	1450	133	Curve PDF
LLT150-6/7.5	LLT150	1	50	7.5	210–300	4–7.4	1450	145	Curve PDF
LLT150-7.5/7.5	LLT150	1	50	7.5	210–300	5.6–8.9	1450	146	Curve PDF

Performance range

Every model of the LLT (coaxial) range on one chart: each line is the performance curve of one model. Click a line or dot to open that model with its full data.

LLT65
LLT80
LLT100
LLT125
LLT150

Logarithmic scales. Published catalogue data for clean water; the correct model for your duty is confirmed by our engineers.

Dimensions & weight

Net weight and the main dimensions of each model, in millimetres, from the catalogue. Open a model for the labelled dimension drawing.

Model	Hz	Weight (kg)	A	B1	B2	H	A1	A2	d1
LLT65-5/1.1	50	32	340	100	110	490	130	170	15
LLT80-5/1.5	50	39	390	100	120	545	150	190	15
LLT100-5A/2.2	50	66	560	130	173	702	160	200	15
LLT100-5/2.2	50	66	560	130	173	702	160	200	15
LLT125-5A/3	50	72	560	145	195	732	200	240	15
LLT125-5/4	50	83	560	145	195	731	200	240	15
LLT150-6A/5.5	50	133	720	175	232	765	260	300	15
LLT150-6/7.5	50	145	720	175	232	803	260	300	15
LLT150-7.5/7.5	50	146	720	175	232	803	260	300	15

Spare parts for LLT (coaxial)

Parts list of the series with the material of each part. To order, send the model code and the part you need.

Parts list (PDF) Request spare parts quote

No.	Part	Material	Standard	Applies to
1	Pump body	Cast iron HT200	ASTM25B	All sizes
2	Impeller	Stainless steel ZG07Cr19Ni9	AISI304	All sizes
3	O-ring	NBR	—	All sizes
4	Air-vent assembly	Assembly	—	All sizes
5	Pump head	Cast iron HT200	ASTM25B	All sizes
6	Knife type mechanical seal	SC/TC	—	All sizes
7	Motor	—	—	All sizes

Technical data

Liquid temperature

-15 to +100 °C

Ambient conditions

Up to +40 °C

Motor

TEFC motor, IP55, insulation class F; 50 Hz 1×220 V, 3×380 V

Supply voltage

1 x 220 V
3 x 380 V

Typical applications

Water circulation of closed cooling towers and condensers
Cooling of various unit equipment
Large-flow, low-head duties

Pumped liquid

Clean, thin, non-erosive, non-flammable and non-explosive liquids without solid particles or fibres that could damage the pump mechanically or chemically. A viscous or dense liquid lowers the characteristic curve and increases energy consumption.

Data basis

50 Hz, 2900 / 1450 / 1480 rpm, 20 °C clean water without foreign matter, measured at 3×380 V; use within the bold part of each curve

Performance values are taken from the published CNP catalogue data. Our engineers confirm the final selection for your liquid, temperature, supply and site before quoting.