Horizontal Centrifugal Split Case Fire Pump

Posted by angroup on August 18, 2022

An Pump Machinery is a leading global supplier of reliable products and innovative pumping solutions to end users. No matter what type of fluid you need to move, An Pump Machinery has the potential to pump for the job. From engineering design to final assembly, every step of the manufacturing process is controlled by experienced personnel and state-of-the-art equipment. We are experts in one-stop pumping solutions, and durability is always the most cost-effective solution for your demanding applications. Next, I will take you to know about our centrifugal horizontal split pump for fire protection.

The horizontal split case pump is named after the split design of the casting, in which the cover can be lifted from the pump to expose the internal components (impeller, shaft, double suction seal, bushings, bearings, etc.) for easy access to all working parts; the impeller of the split casing pump has two water inlet points, which is where the term "double suction" is used, so the horizontal split case centrifugal pump is also called a single stage double suction centrifugal pump.


Horizontal split pumps are the most common type of fire pump, and these pumps are designed and tested for fire protection applications where performance reliability is critical. The pump body and cover form the working chamber for the impeller. The inlet and outlet flanges have pipeline screw holes for installing vacuum gauges and pressure gauges, and the lower part of the inlet and outlet flanges have pipeline screw holes for the static balance verification of the discharge impeller. Both sides are fixed with sleeves and sleeve nuts. Its axial position can be adjusted by a sleeve nut. The axial force of the impeller is balanced by the symmetrical arrangement of its vanes The horizontal split centrifugal pump shaft is supported by two single-row radial ball bearings. The bearings are installed in the bearing bodies at both ends of the pump body and lubricated with grease. The shaft seal is a soft packing seal. To cool and lubricate the seal cavity and prevent air leakage into the pump, there is a water seal ring between the packings. When the horizontal split centrifugal pump is working, a small amount of high-pressure water flows into the packing cavity through the water seal pipe, which acts as a water seal. Horizontal split centrifugal pumps are designed with suction and discharge nozzles in the lower half of the housing, side by side, while the impeller shaft is located between two bearings, one on each side. This robust and simple design is particularly suitable for high flow applications as it reduces thrust loads and allows operation over a wide range of capacities. The durability of the split pump design allows the pump to be used for water flows in excess of 5,000 GPM.

In order to meet the strict fire protection requirements, the split pump is usually made of ductile iron pump casing with 304 or 316 stainless steel wetted parts, duplex stainless steel wetted parts, nickel aluminum bronze wetted parts or special materials can be provided on request
An Pump Machinery's split case fire pumps are available in flow rates from 500 GPM to 5000 GPM, are available with electric (50 Hz and 60 Hz) or diesel drive, and are designed to meet most normal requirements.

Horizontal split case pumps are generally heavier and more expensive than comparable end suction pumps with lower initial costs due to the need for large flanges, larger impellers and overall large size for split housing seal joints and also require more installation space. However, the maintenance costs and downtime of the end suction pump can far outweigh any initial cost savings.
The horizontal split pump is easy to maintain because the upper part of the pump body can be disassembled, so the internal parts (bearings, shafts, impellers, etc.) are exposed and will not interfere with the suction or discharge piping, and will not move the motor.
On the other hand, end suction pumps are more difficult to maintain due to their compact design, for example, removing the impeller requires removing the motor to provide room to pull the impeller back into the housing.
The orientation of the split-type fire pump must be determined at the time of manufacture and installation. The pump must be right-handed (clockwise) or left-handed (counterclockwise) from the driver's vantage point. For diesel-powered fire pumps, the pump can only rotate clockwise. Failure to install properly may result in the pump being disassembled and reassembled in the field for proper rotation (if driven by an electric motor) or rerouting of piping (if driven by a diesel engine).

The precise balance of all factors in the design of An Pump Machinery's horizontal split fire pump provides mechanical reliability, efficient operation, and minimal maintenance. The simplicity of the design ensures long effective unit life, reduced maintenance costs, and the lowest power consumption, widely used in fire protection of buildings and other building infrastructures such as industrial fire protection systems, residential fire protection systems, commercial fire protection systems, warehouses Fire-fighting system, fire-fighting on ships and offshore platforms.

In order to facilitate the installation of customers on-site, we provide customers with all necessary accessories for fire protection systems, including system controllers.
The full range of solutions available includes horizontal split case pumps, end suction pumps, and vertical in-line pumps.

split case pump
horizontal split case pumps
end suction pumps
end suction pumps
vertical in-line pumps
vertical in-line pumps
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