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Fairbanks Nijhuis
1900 Series Multi-Stage Split Case Pumps

1900 Series Multi-Stage Split Case Pumps

Product catalog summary

Introduction
The Fairbanks Nijhuis 1900 Series multistage split case pumps are engineered for high head applications across municipal, industrial, and commercial sectors. They support capacities up to 1800 GPM and heads up to 1200 feet, withstanding temperatures up to 275°F. The series includes models 1910, 1920, and 1940, each designed for specific installation scenarios, such as space limitations and flood protection.

Model Descriptions

Model 1920: Horizontally mounted, suitable for areas with ample floor space and no flood risk.
Model 1910: Vertically mounted, ideal for flood-prone areas, utilizing flexible shafting.
Model 1940: Vertically mounted with an elevated driver, optimal for limited floor space and marginal flood risk.

Standard Features
The pumps are constructed with bronze, feature dynamically balanced impellers, stainless steel components, and regreaseable ball bearings, ensuring durability and efficiency. Options for mechanical seals and various construction materials are available.

Optional Features
Customizable options include all iron or bronze construction, hardened stainless steel shaft sleeves, oil lubrication, and certified performance tests, allowing adaptation to specific operational needs.

Horizontal Pump Features
The split case design facilitates maintenance, with dynamically balanced impellers and bronze shaft sleeves to prevent wear. Interchangeable stuffing boxes and grease lubrication for bearings ensure a long service life.

Vertical Pump Features
Vertical models share features with horizontal pumps but include specific adaptations like coupling alignment and bearing protection to enhance performance and longevity in vertical installations.

Performance and Range Charts
Detailed range charts illustrate the performance capabilities of various models, emphasizing the importance of selecting the appropriate pump based on specific operational needs.

Engineering Specifications
Specifications for models 1920, 1910, and 1940 detail construction materials, performance capabilities, and operational conditions required for optimal pump performance, ensuring they meet rigorous application demands.

Material and Construction
Valves are designed for inline piping, constructed from Class 30 cast iron with a minimum tensile strength of 30,000 psi. Casings undergo a hydrostatic pressure test at 150% of the specified duty point. The design allows for the removal of the upper casing without disconnecting the piping, and pump sizes 2" and larger feature a multivolute design.

Components
Impellers are made of vacuum cast bronze, dynamically balanced, and securely fastened to the shaft. The pump shaft is constructed from high-grade SAE 1045 steel, protected by bronze sleeves, and equipped with Teflon® coated steel gaskets to prevent corrosion. Renewable bronze casing rings and heavy-duty grease-lubricated ball bearings are included.

Bearing and Housing Design
Bearing housings are designed to flush lubricant and provide continuous cleaning, with an average bearing life of 250,000 hours. The housings are moisture and dust-proof, ensuring permanent alignment.

Sealing Mechanisms
Stuffing boxes and mechanical seal boxes are used to seal the pump shaft. Models 1910 and 1940 feature mechanical seals with stainless steel parts and Buna-N elastomers. A bypass line ensures adequate venting and lubrication.

Mounting and Alignment
Pumps and motors are mounted on a common heavy baseplate, with alignment checked post-installation. Models 1920 and 1940 are flexible coupled to a standard NEMA motor.

Model Specifics
Model 1910 uses vertical open shaft pumps with flexible shafting, while Model 1940 features vertical flexible coupled pumps with a cast iron motor bracket for alignment.

Trademark and Disclaimer
Monel® and Teflon® are registered trademarks, and specifications are subject to change without notice.

Catalog excerpts

1900 Series Multi-Stage Split Case Pumps-1

FAIRBANKS NIJHUIS 1900 Series ® MULTISTAGE SPLIT CASE PUMPS www.FairbanksNijhuis.com

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1900 Series Multi-Stage Split Case Pumps-2

MULTISTAGE SPLIT CASE PUMPS Introduction The Fairbanks Nijhuis 1 900 Series two-stage pumps were designed to meet today's demanding municipal, industrial and commercial market requirements. They meet the needs of high head applications where single stage pumps will not suffice. Fairbanks Nijhuis' pumps are known for quality and reliability, and the 1 900 Series pumps are no exception. The attention to detail done during the design process can be seen in features such as the double row thrust bearings and line boring of the casing for the rotating element, increasing the life of the bearings and...

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1900 Series Multi-Stage Split Case Pumps-3

MULTISTAGE SPLIT CASE PUMPS Pump Features DISCHARGE Standard Features • Bronze fitted pump construction • Bronze shaft sleeves • Dynamically balanced impellers • Bronze case wearing rings • Multivolute on 2" and larger pumps • Stainless steel impeller key • Regreaseable ball bearings • Single row ball bearing (inboard) • Double row ball bearing (outboard) • Coupling guard (Model 1920) • Mechanical seals...single unbalanced (Models 1910 and 1940) • Interwoven, graphite/Teflon lubricated acrylic yarn packing rings (Model 1920) ® • Internal bypass between casing and stuffing box (first stage) •...

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1900 Series Multi-Stage Split Case Pumps-4

MULTISTAGE SPLIT CASE PUMPS Horizontal Pump Features A Split Case Design simplifies disassembly. The suction and discharge piping or alignment is not disturbed. Simply remove the upper casing for service or inspection. Cast lifting lugs are provided. Computer-machined major components with 360 degree registered fits assure concentric fit. Dynamically Balanced Impellers are keyed to shaft and secured by adjustable shaft sleeves. Opposed suction design balances out hydraulic thrust loads. Vacuum cast process and proven design provide high efficiency and performance characteristics. Bronze Shaft...

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1900 Series Multi-Stage Split Case Pumps-5

MULTISTAGE SPLIT CASE PUMPS Vertical Pump Features Less floor space required. Typically 1/2 the floor space of a comparable Horizontal Split Case. B Inline piping arrangement allows piping in any direction. Elevated motor protects against potential flooding if the pump station is in a low area. Key Features Features described for the horizontal pumps are also found in the vertical pumps. A. Coupling Alignment with true alignment is vital to long life and proper performance. To maintain proper coupling alignment the mounting bracket is rabbet fitted to the motor. Mechanical Seals C. EXTERNAL UPPER...

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1900 Series Multi-Stage Split Case Pumps-6

MULTISTAGE SPLIT CASE PUMPS Individual performance curves should be checked for final selection. For selections not shown on this chart, please refer to the factory. Power Frame No. 2 Power Frame No. 4A Individual performance curves should be checked for final selection. For selections not shown on this chart, please refer to the factory. Power Frame No. 2 Power Frame No. 3 Power Frame No. 4 Power Frame No. 5

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1900 Series Multi-Stage Split Case Pumps-7

MULTISTAGE SPLIT CASE PUMPS Range Charts 3000 RPM Individual performance curves should be checked for final selection. For selections not shown on this chart, please refer to the factory. Power Frame No. 2 Power Frame No. 4A CUBIC METERS PER HOUR 1500 RPM Individual performance curves should be checked for final selection. For selections not shown on this chart, please refer to the factory. Power Frame No. 2 Power Frame No. 3 Power Frame No. 4 Power Frame No. 5 CUBIC METERS PER HOUR

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1900 Series Multi-Stage Split Case Pumps-8

MULTISTAGE SPLIT CASE PUMPS MODEL 1920 - RIGHT-HAND ROTATION

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1900 Series Multi-Stage Split Case Pumps-9

MULTISTAGE SPLIT CASE PUMPS Power Series

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1900 Series Multi-Stage Split Case Pumps-10

MULTISTAGE SPLIT CASE PUMPS Engineering Specifications Models 1920, 1910 and 1940 Horizontal Split Case Furnish and install as shown on the plans…right-hand (left-hand) Fairbanks Nijhuis model (horizontal-1920) (vertical-1910 open shaft) (vertical-1940 flexible coupled) type split case, opposed suction, multistage centrifugal pump, Size ____ x ____ x ____ of bronze fitted (all bronze) (all iron) (stainless steel) construction. The pump shall be capable of delivering at design conditions a capacity of ____ GPM when operating against a total dynamic Head of ____ feet, with a temperature of ____...

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1900 Series Multi-Stage Split Case Pumps-11

MULTISTAGE SPLIT CASE PUMPS Engineering Specifications Model 1920 Stuffing boxes shall be placed on both sides of the pump centerline to seal the pump shaft. All packed pumps having a suction lift have a first-stage lantern ring connected to the pressure side of the pump by a cored passage in the parting flange of the pump. The stuffing boxes shall be equipped with heavy, cast, split glands with extra length for easy removal for packing inspection and maintenance. Pump and motor shall be mounted on a common heavy baseplate of (steel drip rim) (formed steel) (structural steel). Pump and motor...

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1900 Series Multi-Stage Split Case Pumps-12

3601 FAIRBANKS AVENUE, KANSAS CITY, KANSAS 66106 www.FairbanksNijhuis.com Monel ® is a registered trademark of Special Metals Corporation. Teflon ® is a registered trademark of E. I. du Pont de Nemours and Company. Fairbanks Nijhuis is a registered trademark of Pentair Ltd. Because we are continuously improving our products and services, Pentair reserves the right to change specifications without prior notice. FM-02-1521 06/24/13 © 2013 Pentair Ltd. All Rights Reserved.

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1900 Series Multi-Stage Split Case Pumps

1900 Series Multi-Stage Split Case Pumps

Catalog excerpts

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