PH Boiler Feed Pump Selection Calculation Report

1. Introduction

This report presents the calculation and selection of a suitable pump for an industrial boiler feedwater

system. The system requires a pressure of 3 bars (30.6m head) at the end of the pipeline. The

feedwater is cold, and the piping material considered is SS304. Initially, a 1-inch pipe was proposed,

but a 2-inch pipe is now under consideration to reduce pressure losses.

2. System Parameters

•  Pipe Length: 100m

•  Vertical Lift: 3m

•  Required Pressure at Boiler Inlet: 3 bars (~30.6m head)

•  Number of 90-degree Elbows: 16

•  Number of 45-degree Elbows: 1

•  Number of Branches: 11 (assumed closed, negligible loss)

•  Flow Rate Considered: 150 L/min

•  Pipe Material: Stainless Steel 304 (SS304)

•  Pipe Diameters Considered: 1 inch (25.4 mm) and 2 inches (50.8 mm)

•  Hazen-Williams Coefficient (C): 140

3. Friction Loss Calculation

The Hazen-Williams equation was used to determine the friction loss in the pipeline:

Where:

•  hf = Head loss due to pipe friction (m)

•  L = Pipe length (m)

•  Q = Flow rate (m3/s)

•  C = Hazen-William’s coefficient (unitless)

•  D = Pipe diameter (m)

Fittings were accounted for using an equivalent head loss method based on velocity and standard loss coefficients for elbows.

4. Calculation Results

Pipe Size	Flow Rate (L/min)	Friction Loss (m)	Fittings Loss (m)	Total Dynamic Head (m)
1 inch	150	102.91	3.02	139.53
2 inch	150	3.52	3.02	40.14

Feasibility of 1-Inch Pipe for 150 L/min Flow Rate

The 1-inch pipe is not feasible for delivering 150 L/min at the required 3 bar (30.6m) pressure due

to excessive friction loss (102.91m head loss). The resulting total dynamic head requirement

(139.53m) is far beyond standard pump capabilities, making the 1-inch pipe impractical for this

application.

The 2-inch pipe is the recommended option, as it keeps the total head requirement at 40.14m,

which is within standard industrial pump capacities.

5. Pump Selection

Based on the calculated Total Dynamic Head (TDH), a pump with a minimum head of 45m is

required for the 2-inch pipe. To ensure operational reliability and safety margin, pumps with 50m head are recommended.

Recommended Pumps:

Preferred Vertical Multistage Pumps:

•  Grundfos CR10-6 (2.2 kW, 150 L/min, 45m head, SS304)

•  Lowara e-SV 10SV04F040T/D (4 kW, 150 L/min, 42m head, SS304)

•  KSB Movitec VCI 32/6 (3 kW, 150 L/min, 40m head, SS304)

Alternative Horizontal Multistage Pumps:

•  Grundfos CM10-6 (2.2 kW, 150 L/min, 45m head, SS304)

•  Lowara e-HM 10SV06F040T/D (3 kW, 150 L/min, 42m head, SS304)

Vertical vs. Horizontal Pump Considerations:

 Vertical pumps are preferred due to space efficiency, ease of installation in confined areas,

and high-pressure capabilities.

 Horizontal pumps may be considered if maintenance access is a priority, as they allow

easier servicing without dismantling from the system.

6. Conclusion & Recommendation

• The 1-inch pipe is not feasible for this system due to excessive friction loss. The 2-inch pipe is the only practical choice, ensuring efficient operation with a total dynamic head of 40.14m.

•  A vertical multistage pump is preferred due to space constraints and existing installation setup. However, a horizontal multistage pump can be considered if maintenance accessibility is a key concern.

•  A minimum of 45m head and 150 L/min flow rate should be targeted for stable operation.

•  If required, a VFD (Variable Frequency Drive) can be added for precise pressure control and energy savings.