1
Hot feedwater at the inlet
Assess suction margin at operating temperature. Coordinate tank level, suction losses and pump selection.
Address cavitation risk at its source.
BOILER FEED PUMPS
Boiler Feed Pumps for Changing Plant Duty
Plan boiler feed pumps and high-head duties using feedwater temperature, inlet pressure, required flow and total head. Review the appropriate QD multistage pump version, operating range and plant interfaces before selecting a configuration.
Related resources: QD multistage boiler feed pump
Industrial steam · Process heating · High-head water service
Illustrative boiler-room scene
Plan boiler feed pumps at three critical points.
2
Changing steam demand
Match the pump curve to the required flow and head across the agreed duty range, with a suitable control strategy.
Keep pump selection connected to boiler demand.
3
Start-up and low-flow periods
Define the minimum-flow requirement and a return arrangement where needed. Match the mechanical configuration to the thermal duty.
Account for operation beyond the normal duty point.
BEYOND THE DESIGN POINT
Follow the feedwater duty through the operating cycle.
The pump must be reviewed for the conditions it will actually see, including periods when the boiler demand is low.
01 / START-UP
Establish the inlet condition.
Record the feed-tank temperature and level at start-up. Check that the proposed filling, venting and start sequence suits the pump and the plant.
02 / NORMAL DUTY
Follow the demand range.
Keep minimum, normal and maximum flow paired with their required delivery head. Review the proposed control method against these operating points.
03 / LOW DEMAND
Keep operation within the agreed range.
Confirm the selected pump’s minimum-flow requirement and how it is maintained. Where a return is required, its route, control and supply scope must be defined.
EQUIPMENT FOR THE DUTY
QD / QD(G) horizontal multistage pumps.
A horizontal multistage assembly is the BBP product starting point for high-head water transfer and boiler-feed review. Match the selected version to the feedwater temperature, required head and available inlet conditions.
QD series brochure photograph
HYDRAULIC DUTY
Flow and head together.
Review the actual curve and stage selection for the required operating range.
THERMAL DUTY
The version matters.
Confirm the temperature limit, seal arrangement and wetted materials of the proposed model.
PLANT FIT
Leave room to install and maintain.
Check the assembly drawing, connections, base, drive and access around the horizontal set.
Comparing horizontal and vertical multistage arrangements?
THE COMPLETE FEEDWATER ARRANGEMENT
Connect pump selection to the plant interfaces.
Keep the proposed equipment, control responsibilities and site provisions in the same enquiry.
At the feed tank
Provide the pressure and level range, feedwater temperature, pump elevation and suction-line layout. These establish the inlet conditions for the pump review.
At the delivery connection
Provide the required flow, boiler or process pressure and the delivery route. Identify valves and other losses between the pump and the destination.
At the control system
Agree the demand signal, start and stop sequence, standby strategy and low-flow provisions. Confirm the motor, control panel and instrument scope.
At technical handover
Request the selected curve, arrangement drawing, applicable operating instructions and agreed inspection documents for the proposed equipment.
Before choosing a pump
Can every multistage pump handle hot feedwater?
Temperature suitability depends on the proposed series, version, materials and seal arrangement. Confirm the actual model limits and inlet conditions; a multistage construction alone does not establish hot-water suitability.
Where can I compare the available equipment?
The multistage product page introduces the horizontal QD / QD(G) and vertical QDL / QDLS arrangements. Start the boiler-feed review with the applicable QD / QD(G) version and its specific curve, temperature limit and installation requirements.
Is boiler pressure enough to select the pump?
Boiler pressure is one part of the duty. Required flow, delivery-route losses and the feedwater conditions at the inlet must be considered together.
Why does minimum flow belong in the solution?
The selected pump has an operating range that also applies when plant demand falls. A suitable minimum-flow provision, where required, addresses low-flow heating and related operating risks. Its arrangement and scope are defined for the plant.
Build the feedwater solution around your plant.
Start with the operating problem and available system drawings.