Boiler System Sizing Calculator
Static · formula-only · worked example computed when this page was built · no live data
The Boiler System Sizing Calculator finds the boiler capacity (kW/BHP) and fuel consumption from steam demand, pressure, and feedwater temperature. Example: for a steam boiler delivering 500 kg/h at 7 barg from 80 °C feedwater on diesel, at 85% boiler efficiency with a 1.25 design safety factor, Boiler capacity = 422.5 kW, Boiler HP = 43.1 BHP, Fuel use = 49.9 L/h (per ASME BPVC Sec.I/IV | ASME B31.1).
How it works
Computed from your inputs per ASME BPVC Sec.I/IV | ASME B31.1. Anything the worked example does not state uses this calculator's standard default; the interactive version shows every input and lets you change it.
Worked example (Boiler & Utilities)
Inputs: a steam boiler delivering 500 kg/h at 7 barg from 80 °C feedwater on diesel, at 85% boiler efficiency with a 1.25 design safety factor.
| Result | Value |
|---|---|
| Boiler capacity | 422.5 kW |
| Boiler HP | 43.1 BHP |
| Fuel use | 49.9 L/h |
Computed by WorkHive's calculation engine when this page was built; standard: ASME BPVC Sec.I/IV | ASME B31.1.
How to use this calculator
- Read the worked example. It uses a steam boiler delivering 500 kg/h at 7 barg from 80 °C feedwater on diesel, at 85% boiler efficiency with a 1.25 design safety factor and shows every number in the method.
- Follow the formula with your own figures: it returns Boiler capacity, Boiler HP, Fuel use, computed per ASME BPVC Sec.I/IV | ASME B31.1.
- To compute interactively, open the Boiler System Sizing Calculator inside WorkHive's free Engineering Design suite (link below). It runs the same method with your inputs.
FAQ
What is a boiler sizing calculator kW fuel consumption?
The Boiler System Sizing Calculator is a free online tool that finds the boiler capacity (kW/BHP) and fuel consumption from steam demand, pressure, and feedwater temperature. It shows the formula and a fully worked example so you can check the method, not just the number.
How is it calculated?
The result is computed from your inputs following ASME BPVC Sec.I/IV | ASME B31.1. The worked example on this page shows a real computation with real numbers.
Is the calculator free?
Yes. WorkHive is free: this worked example is open to everyone, and the interactive calculator runs inside the free Engineering Design suite after a free sign-up (your work is saved to your account). WorkHive is a free, offline-first maintenance platform built for Philippine industrial plants.
Run it on your own numbers
Open the interactive Boiler System Sizing Calculator in WorkHive. Free, and a free sign-up saves your calculations, BOMs and scope-of-works to your account.