Quick service
Fire sprinkler hydraulic calculations
Hydraulic calculations for a fire sprinkler system, checked against the available water supply, for a new system, an extension or a change of occupancy.
What you get
- Hydraulic calculation for the most demanding area of the sprinkler system
- Flow and pressure needed at the base of the riser, compared with the water supply
- Pipe sizes checked, or resized so the system meets the demand
- A supply-and-demand graph showing the safety margin
- Calculation report as a PDF
When you need hydraulic calculations
- A new sprinkler system, or an extension to an existing one
- A change of use or storage that raises the hazard class
- The fire authority asks for calculations with the sprinkler drawings
- A new water flow test shows less pressure than the system was designed for
- You need to know whether a fire pump is required
How it works
- 1
Send the drawings and water data
The sprinkler layout or architectural plans, the use of each space, and a recent water flow test if you have one.
- 2
We confirm scope and fee
An engineer replies within one business day, and we sign an NDA before you send files.
- 3
We calculate
The most demanding area is modelled pipe by pipe, using the design density and area for its hazard class, and the demand is checked against the available water supply.
- 4
You receive the report
The calculation, the supply-and-demand graph and any pipe changes, ready to submit with the sprinkler drawings.
Price and turnaround
Each job is quoted from your drawings. Send them and an engineer replies within one business day with the fee and a delivery date.
Frequently asked questions
What is a sprinkler hydraulic calculation?
It shows that the water supply can deliver enough flow and pressure to the sprinklers in the most demanding part of the building. It decides the pipe sizes and whether a fire pump is needed.
What do you need to start?
The sprinkler layout or the floor plans, what each space is used for, and the results of a water flow test. If there is no recent test, we tell you what to ask the water authority for.
What if the water supply is not enough?
The report shows how far short it is and the options: larger pipes, a different layout, a storage tank or a fire pump.
Can this be part of a full design later?
Yes. The calculation carries straight into a full MEP design if you decide to continue with us.
Ready to order?
Tell us about the site and attach any drawings. An engineer replies within one business day, and we sign an NDA before you send project files.
Need the whole building designed? See our full MEP design service, or start with a free project review.