A square full cone header should be designed from the required target coverage, mounting distance, nozzle flow, available pressure and usable edge distribution. Square patterns can tile a rectangular area efficiently, but only when every nozzle is aligned consistently and the complete header is pressure-balanced.
Why Square Pattern Orientation Matters
A square impact area has defined sides and corners. Rotating one nozzle relative to the others changes how the footprints meet. Mark the body orientation or use an installation reference so every nozzle is assembled in the intended direction.
Seven Header Design Rules
- Define the usable target area. Record length, width, obstacles and areas that must not be sprayed.
- Confirm mounting distance. Use the actual nozzle-to-target distance, not only the available ceiling height.
- Select flow at nozzle pressure. Account for pipe, filter, valve and elevation losses.
- Estimate the footprint. Use spray angle and distance for preliminary geometry, then verify the real pattern.
- Align every square pattern. Keep sides and corners oriented consistently across the grid.
- Balance the header. Size and arrange the supply so pressure variation is controlled across representative positions.
- Test before approval. Map the complete distribution under the intended operating condition.
Header Inputs
| Input | Why it matters |
|---|---|
| Target width and length | Defines preliminary nozzle count and grid arrangement |
| Mounting distance | Changes theoretical footprint and available clearance |
| Flow per nozzle | Determines total header demand |
| Pressure at nozzle | Controls model flow and pattern behaviour |
| Liquid properties | Affect capacity, compatibility, filtration and maintenance |
| Pipe routing | Influences pressure loss and distribution across the header |
| Maintenance access | Determines isolation, removal and inspection design |
How to Set Preliminary Spacing
Start from the theoretical footprint at the intended mounting distance. Position nozzles so the target is covered without relying on an unverified edge. The final spacing should be based on a distribution test, because pressure, gravity, liquid condition and nozzle geometry can change the usable footprint.
Do not apply one fixed overlap percentage to every system. The acceptable overlap depends on the process tolerance and the measured pattern.
Pressure Balance Across the Header
Total pump pressure does not prove equal pressure at each nozzle. Review pipe diameter, header length, branch geometry, filter restriction, control valves and the number of nozzles operating simultaneously. Measure representative points near the beginning, middle and end of the header during commissioning.
Square Wide-Angle or Standard Square Full Cone?
| Condition | Starting product | Verification |
|---|---|---|
| General square-pattern header | BB square full cone nozzle | Model flow, angle, orientation and edge coverage |
| Broad footprint at limited mounting distance | Square wide-angle full cone nozzle | Clearance, pattern stability and overlap |
Commissioning Test
- Confirm model and orientation at every position.
- Run the complete intended nozzle set.
- Record pressure and total flow after stabilization.
- Map collection or wetting across the target grid.
- Check edges, corners and transitions between nozzles.
- Change only one variable before repeating the test.
- Record the approved configuration for maintenance reference.
Use the detailed full cone spray distribution test method.
Information Required for Header Review
Send the target drawing, nozzle distance, required total flow, available pressure, preferred nozzle count, liquid details, pipe layout, material, connection and operating sequence.
Request a square full cone header review
Related: Full cone nozzle products | Full cone selection guide