📞 +1 877-742-2878
Burt Process Equipment
A premier source for reliable pumps and process controls, backed by advanced expertise, strong product support, and customer-focused service.
Visit the website >>
Burt Tools & Automation
Industrial-grade tools, including Lifting Solutions, Engine Starting, Air Motors, Assembly Solutions, Construction, Drilling, Bolting, and Surface Preparation Tools.
Visit the website >>
Burt Engineered Systems
A global leader in process, fluid handling, and wastewater treatment systems, fully engineered and precision-built from concept to operation.
Visit the website >>
ProFlow - Modular Fluid Systems
For over 30 years, ProFlow has delivered modular fluid handling systems backed by expert support, advanced technology, and uncompromising quality worldwide.
Visit the website >>- Home /
- Markets /
- Marine /
- Boiler Feed
Boiler Feed
Grundfos Centrifugal CR pumps
Steam boiler feed systems serve the primary purpose of providing a steady and pressurized water supply to the ship's boilers. The boilers use this water to produce steam, which drives turbines or engines for propulsion and electricity generation. Centrifugal pumps are more common types of boiler feed pumps used on ships due to their simplicity and reliability.
- Grundfos Solutions
- Features & Benefits
- Resources
The Grundfos CR series vertical, multistage centrifugal pumps are purpose-built for the demanding needs of boiler continuous feed water. These pumps are engineered to meet the requirements of high flow, elevated temperature, and increased pressure within the boiler system.
CR series boiler feed pumps provide water at a pressure exceeding the boiler's operational pressure. This ensures the pump can overcome resistance and losses in the feedwater system, thus maintaining a steady and uninterrupted water flow to the boiler.Max. flow: 402 m³/h
Head max.: 391 m
Liquid temperature: -22 .. 248° F
p max: 580 psi
Learn how to maintain a constant water level in steam boiler.
Pump suction conditions: On ships, the location and elevation of the feedwater tanks relative to the boilers can create specific requirements for pump performance. NPSH (Net Positive Suction Head) considerations are important to ensure that the pump can draw water adequately from the tanks.
Cavitation is the main reason for pump system breakdowns – and the high temperatures in steam boiler systems increase the risk of it occurring.
Cavitation occurs when the pressure in the pipes and pump inlet drops below the vapor pressure of the water causing bubbles of steam to form and implode at great speed and pressure. In other words, the Net Positive Suction Available is less than the Net Positive Suction Head Required (NPSHA < NPSHR).
To avoid cavitation which can seriously damage the pumps, the right system design and the right feed pumps are necessary.
Firstly, the deaerator should be placed high above the feed pumps. This will increase the pressure derived from geographical height and reduce the risk of cavitation.
The second step is fitting the boiler system with pumps that are designed to work with poor inlet pressure. Also, use special impellers and chambers to improve the suction capabilities.
There are several strategies to control the feed pumps: from simple start/stop signals to feed valves. However, a variable speed pump connected to a level sensor will allow you to avoid the expansive feed valves and the inevitable pressure drop that comes with them. The result is a constant water level in the boiler and reduced energy and operation costs.
Grundfos CR series in-line multi-stage pump advantages:
- Durability: The CR pump is built from cast iron with all wetted parts made of AISI 304 grade stainless steel, making this pump suitable for non-corrosive liquids.
- Compact Design: Grundfos CR pumps can fit into tight spaces while still delivering the required flow and pressure. Available in 16 flow sizes and hundreds of pressure sizes.
- Versatility: A wide range of connection types and flange sizes to choose from means the pump can be connected to various marine boiler systems.
- Balanced cartridge shaft seal: minimizes the risk of leaks and fluid loss.
- Easy Maintenance: Maintenance-free mechanical shaft seal.
- Tungsten Carbide - wear-resistant bearing material: ensures a longer service life and reduces maintenance requirements.
- High hydraulic efficiency: Performance is optimized from fluid mechanics insights provided by extensive simulation-driven design and verification.
- Certification: Grundfos production is certified in accordance with the strictest international standards (ISO 9001) and is subjected to rigorous process control.
