Building Services Calculators

• Heat load (kW)
• Supply-return temperature difference
• Line length, number of elbows and valves

Result: Recommended size, velocity, pressure loss and bill of materials.

• Number and output of boilers
• Number of circuits and load of each
• Flanged or welded nozzles

Result: Body and nozzle sizes, overall length, manufacturing quote.

• Straight line length
• Installation and operating temperature
• Pipe size and pressure

Result: Expansion (mm), anchor spacing, number of expansion joints.

• 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.

• Number of flats and floors
• Water tank or mains
• Pressure required on the top floor

Result: Booster set flow, head and tank volume.

• Boiler output or water volume
• Building height
• Safety valve pressure

Result: Vessel volume, pre-charge and fill pressure.

• Flow rate or pipe size
• Valve type
• Operating pressure (PN)

Result: Valve size and PN; flanges, gaskets and bolts for each valve.

• Number of flats and floors
• Number of fixtures (washbasin, shower, WC)
• Mains or booster pressure

Result: Main and riser sizes (TS EN 806).

• Number of flats and fixtures
• WC type
• Building use

Result: Drainage stack size and design flow.

• Room area and height
• Insulation and external walls
• Radiator type and height

Result: Required heat (W) and radiator length.

• Heated area (m²)
• Climate zone and insulation
• Number of bathrooms

Result: Heat load and recommended boiler output.

• Appliances and their outputs (kW)
• Distance from the meter
• Pressure (21 mbar / 300 mbar)

Result: Size and pressure loss of each line section.

• Cooling capacity (kW or TR)
• Supply-return temperatures (e.g. 7/12 °C)
• Glycol ratio

Result: Recommended size, velocity, pressure loss and bill of materials.

• Number and capacity of units
• Order of the units along the line
• Supply-return temperatures

Result: Size of each section; list of tees, reducers and elbows.

• Pipe size and water temperature
• Ambient temperature and humidity
• Insulation material

Result: Minimum insulation thickness and suitable products.

• Hazard class
• Number of sprinklers
• Distance and height of the farthest point

Result: Main and branch sizes, flow and pressure.

• Number of cabinets operating at the same time
• Building height
• Distance to the pump

Result: Required flow and pressure, riser size.

• Sprinkler and hose cabinet flow
• Elevation difference
• Electric, diesel, jockey

Result: Pump flow and head, suction and discharge line sizes.

• Hazard class
• Total flow
• Operating time (min)

Result: Required tank volume (m³).

• Number of people or flats
• Days of reserve
• Including fire water?

Result: Tank volume for domestic and fire water.

• Pipe size and PN
• Flange type
• Number of joints and valves

Result: Quantities of flanges, gaskets, bolts, nuts and washers.

• Pipe size and wall thickness
• Total length
• Insulated?

Result: Weight per metre and total weight, hanger load.

• Pipe size and material
• Line length
• Horizontal or vertical

Result: Support spacing, number of hangers, rod size.

• Operating pressure
• System type
• PN class of flanges and valves

Result: Test pressure, duration and PN compliance.

• DN or inch
• Pipe standard
• Wall thickness / schedule

Result: Outside diameter, inside diameter, wall thickness and weight per metre.

• Pipe size
• Flow velocity
• Or a known flow rate

Result: Flow rate (m³/h, L/s) or the required size.

• Valve type
• Size (DN)
• Pressure class

Result: Valve length and the distance between the two flanges.

• Elevation difference (m)
• Pump pressure
• Water hammer allowance

Result: Line pressure and the required flange PN class.

• Size (DN)
• Design or test pressure
• Material

Result: Minimum required thickness and a suitable blind flange.

• Run pipe and branch size
• Wall thicknesses
• Design pressure

Result: Whether a pad is needed and its size.