ALLWEILER NT Series Horizontal Volute Centrifugal Pump
ALLWEILER NT Series Horizontal Volute Centrifugal Pump
ALLWEILER NT Series Horizontal Volute Centrifugal Pumps | General-Purpose Industrial Pumps Compliant with DIN EN 733 Standards
ALLWEILER NT Series Horizontal Volute Centrifugal Pump Product Overview
The NT series is a classic horizontal volute centrifugal pump from the German company ALLWEILER. It features a base-mounted
design and meets the performance standards of DIN EN 733 (formerly DIN 24255). This series' bearing-supported design differs
from the direct-coupled block design of the NB series, making it suitable for applications requiring continuous operation.
ALLWEILER, a German pump brand with over 150 years of history (now part of the CIRCOR Group), offers a wide range of centrifugal
pumps. The NT series is specifically designed for clean or lightly contaminated non-corrosive liquids and is suitable for various
applications including cooling and heating circulation systems, water supply and treatment, air conditioning and refrigeration,
and industrial processes. It represents a classic industrial-grade solution for general fluid transport.
ALLWEILER NT Series Horizontal Volute Centrifugal Pump Series Differentiation:
NT Series: Horizontal volute centrifugal pump, conforming to DIN EN 733, bearing-supported structure, base mounting, universal
liquid transfer, maximum temperature 140°C
NTT Series: High-temperature thermal oil pump, maximum temperature 350°C
NTWH Series: Wide temperature range thermal oil pump, maximum temperature 400°C, compatible with mineral oil/synthetic
oil/high-temperature hot water
ALLWEILER NT Series Horizontal Volute Centrifugal Pump Model Description
The NT series adopts the German standard naming convention. The following are typical model interpretations:
Model Example | Meaning
NT 50-250 | Discharge port diameter DN50, impeller nominal diameter 250mm
NT 65-200 | Discharge port diameter DN65, impeller nominal diameter 200mm
NT 125-315 | Discharge port diameter DN125, impeller nominal diameter 315mm
Available Specifications (Partial List):
Model | Discharge Port Diameter DN | Impeller Diameter (mm) | Reference Speed
NT 25-160 | 25 | 160 | 2900/1450 rpm
NT 32-160 / 32-200 | 32 | 160 / 200 | 2900/1450 rpm
NT 40-160 / 40-200 / 40-250 | 40 | 160 / 200 / 250 2900/1450rpm
NT 50-160 / 50-200 / 50-250 50 160 / 200 / 250 2900/1450 rpm
NT 65-160 / 65-200 / 65-250 65 160 / 200 / 250 2900/1450 rpm
NT 80-160/80-200 80 160/200 2900/1450 rpm
NT 125-315 / 125-400 125 315 / 400 1450 rpm
NT 150-250 / 150-315 / 150-400 150 250 / 315 / 400 1450 rpm
NT 200-250 / 200-315 / 200-400 200 250 / 315 / 400 1450 rpm
NT 250-315 / 250-400 250 315 / 400 1450 rpm
NT 300-315 / 300-400 300 315 / 400 1450 rpm
Note: Dozens of specifications are available, ranging from NT 25-160 to NT 300-400, covering applications from low to
high flow rates. Models starting with "NT 2/" (e.g., NT 2/25-200) indicate a two-stage pump design, meeting higher head
requirements.
ALLWEILER NT Series Horizontal Volute Centrifugal Pump Core Technical Parameters
Parameter Item Specification Range
Maximum Flow Rate 2,300 m³/h
Maximum Head 145 m
Maximum Outlet Pressure 10 / 16 bar (PN10 / PN16)
Maximum Medium Temperature 140 °C
Minimum Medium Temperature Approx. -40 °C (depending on sealing material)
Speed 2900 rpm / 1450 rpm (optional)
Connection Method Flange connection (DIN standard)
Installation Method Horizontal, base mounting
Design Standard DIN EN 733 (formerly DIN 24255)
Applicable Industries General Industry / Marine and Offshore Engineering
Note: The NT series features a bearing-supported base mounting structure (pump and motor are mounted on
the same steel base), unlike the direct-coupled block design of the NB series.
ALLWEILER NT Series Horizontal Volute Centrifugal Pump Product Features and Design Advantages
1. Compliant with DIN EN 733 Standard
Performance parameters and structural dimensions strictly comply with DIN EN 733 (formerly DIN 24255) standard,
ensuring good interchangeability with mainstream pump types on the market.
2. Bearing Bracket Design for High Reliability
Utilizing a bearing bracket design, unlike direct-coupled designs, both the pump end and drive end are equipped with
independent bearings, suitable for applications requiring continuous operation, such as cooling water circulation, ballast
water systems, and industrial process water supply.
3. Modular Back-Pull-Out Design for Convenient Maintenance
The modular back-pull-out design allows the entire rotating component (impeller, shaft, bearings, seals) to be removed
without disassembling the pump casing and piping, significantly reducing maintenance time.
4. Optional Two-Stage Pump Design
Some specifications are available in two-stage pump configurations (such as the NT 2/series) to meet higher head requirements.
5. Bearing Monitoring Interface: Interfaces for temperature and vibration sensors are provided at the bearing positions on
both the drive and non-drive ends, enabling online monitoring of equipment status and compatibility with predictive
maintenance systems.
6. Wide Range of Applicable Media: Capable of conveying a variety of media including pure water, industrial water, seawater,
condensate, oil, brine, alkali solutions, and hot water. The media must not contain abrasive particles or components that
chemically corrode the pump materials.
7. Flexible Configuration
ATEX explosion-proof type optional (suitable for hazardous areas)
Sealing type optional: packing seal or single-end mechanical seal
Optional extended coupling (with spacer coupling) for easy maintenance
Core Application Areas
NT series centrifugal pumps are widely used in the following industries and scenarios:
Application Areas Typical Scenarios
Cooling and Heating Circulation
Cooling water circulation, heating systems, heat recovery
Water Supply and Water Treatment
Water supply systems, water treatment, seawater desalination, drinking water
Air Conditioning and Refrigeration
Central air conditioning water systems, cooling tower circulation
Industrial Technology
Dust removal spraying, spraying equipment, industrial processes
Power Industry
Steam boilers, power plant auxiliary systems
Marine and Marine Engineering
Ballast water systems, bilge water systems, cooling water systems
Swimming Pools and Irrigation
Swimming pool circulation, agricultural irrigation
Fire Water Supply
Fire system water supply (must comply with fire protection regulations)
Applicable Media
Pure water, industrial water, seawater, condensate, oil, brine, alkali, hot water (up to 140°C). The medium must not contain
abrasive particles and must not cause chemical corrosion to the pump materials.
Selection Recommendations
Please select the appropriate pump based on the following operating parameters:
Media Type: Clean water / Industrial water / Seawater / Oil / Alkali / Other
Operating Temperature: Maximum/Minimum temperature (°C)
Operating Pressure: Maximum system pressure (bar)
Flow Rate Requirement: Rated flow rate (m³/h)
Head Requirement: Total head required (m)
Sealing Type: Packing seal / Single-end mechanical seal
Special Requirements: Explosion-proof (ATEX) required / Two-stage pump required
Why Choose Us? Direct from the German ALLWEILER manufacturer, 100% genuine products.
In Stock: Commonly used specifications are readily available for fast delivery.
Full Model Coverage: Complete range of sizes from DN 25 to DN 300.
Fast Delivery: Standard specifications are in stock and can be shipped quickly.
Professional Technical Support: We provide selection guidance, installation, commissioning, and after-sales service.
Original Warranty: 1-year warranty under normal use.
Important Note: This product is a genuine German ALLWEILER product. Please look for the brand logo. Using non-original
substitutes may result in substandard performance, seal failure, and other safety hazards.
