Ready
Water Tank Calculation
What size water tank does your building need?
- Number of people or flats
- Days of reserve
- Including fire water?
Result: Tank volume for domestic and fire water.
Most used calculators
Ready
Pipe Size Calculator
Supply and return line size and materials from the heat load
- Heat load (kW)
- Supply-return temperature difference
- Line length, number of elbows and valves
Result: Recommended size, velocity, pressure loss and bill of materials.
Ready
Expansion Vessel Calculation
Vessel litres and pre-charge pressure from the system volume
- Boiler output or water volume
- Building height
- Safety valve pressure
Result: Vessel volume, pre-charge and fill pressure.
Ready
Flow Rate Calculator
Flow from size and velocity, size from flow
- Pipe size
- Flow velocity
- Or a known flow rate
Result: Flow rate (m³/h, L/s) or the required size.
Ready
Booster Pump Set Calculation
What flow and head does your building need?
- Number of flats and floors
- Water tank or mains
- Pressure required on the top floor
Result: Booster set flow, head and tank volume.
Ready
Circulation Pump Calculation
Circuit flow and head, with a pump recommendation
- Heat load and temperature difference
- Line length to the farthest point
- Valves and heat exchangers in the line
Result: Flow rate, head and suitable pumps.
Ready
Sprinkler Pipe Sizing
Solve the sprinkler line with Hazen-Williams
- Hazard class
- Number of sprinklers
- Distance and height of the farthest point
Result: Main and branch sizes, flow and pressure.
Ready
Fire Water Tank Calculation
Tank volume by hazard class and duration
- Hazard class
- Total flow
- Operating time (min)
Result: Required tank volume (m³).
Ready
PE Pipe Sizes and Selection
PE pipe size and SDR from the flow rate
- Flow rate (m³/h or L/s)
- Operating pressure (bar)
- Line length
Result: Recommended outside diameter, SDR and PN, velocity, pressure loss.
Ready
Heat Load and Combi Boiler Capacity
How many kW of combi boiler does your home need?
- Heated area (m²)
- Climate zone and insulation
- Number of bathrooms
Result: Heat load and recommended boiler output.
Ready
Expansion Joint Calculation
How much does the pipe expand, and where does the expansion joint go?
- Straight line length
- Installation and operating temperature
- Pipe size and pressure
Result: Expansion (mm), anchor spacing, number of expansion joints.
Ready
Water Hammer Calculation
How much does the pressure rise when the pump stops?
- Pipe size and material
- Flow velocity
- Valve closing time
Result: Pressure rise (bar) and the required PN class.
For flange dimensions, bolts, gaskets, pipe weight and pressure-temperature calculations, use our Flange and Pipe Calculators page.
Let us turn your calculation into a bill of materials
Send us the list from the calculator; we will quote flanges, elbows, tees, reducers, pipes and valves in a single offer, with EN 10204 3.1 material certificates.
Frequently asked questions
How is pipe weight calculated?
The weight per metre of steel pipe (kg/m) = (outside diameter − wall thickness) × wall thickness × 0.02466, with dimensions in mm. For the water-filled weight, add the water in the pipe's internal volume.
How is the pipe size calculated in a heating system?
First the flow rate is found: flow (m³/h) = heat load (kW) × 0.86 ÷ supply-return temperature difference (°C). Then the smallest pipe size that keeps velocity and pressure loss per metre within suitable limits at this flow is selected. Our calculator does this automatically.
How do I choose the flange pressure class (PN, Class)?
The pressure a flange can carry falls as the temperature rises. So the selection is made from the EN 1092-1 or ASME B16.5 tables using the design pressure and design temperature together, according to the flange material.
What is water hammer and why does it matter?
When a valve closes quickly or a pump stops, the flowing water stops suddenly and a short, high pressure surge occurs in the line. If the PN class of pipes, flanges and valves is not selected for this pressure, damage can occur.
Which standard is used for sprinkler pipe sizing?
In Turkey the Regulation on Fire Protection of Buildings and TS EN 12845 are the basis. Pipe losses are calculated with the Hazen-Williams formula.
Are the results final?
No, the results are for preliminary selection and do not replace engineering design. For a final selection you can send your project to our technical team.
Results are for preliminary selection and do not replace engineering design. Ask our technical team for the final selection.