Extra Large Orifice Sprinklers
K11.2 (160) sprinklers for density/area designed systems — delivering higher flow at lower pressure than standard heads, in pendent and upright configurations for factories and warehouses.
Technical Data
| Product codes | SP21 – SP24 |
|---|---|
| Type | Extra large orifice glass-bulb sprinkler |
| Configurations | Pendent · Upright |
| Response | Standard (5 mm bulb) or Quick (3 mm bulb) |
| K factor | K11.2 (160) |
| Thread | ¾" NPT (20 mm) |
| Temperature ratings | 57 · 68 · 79 · 93 · 141 °C |
| Finishes | Brass · Chrome (White pendent option) |
Selection Guide
For ceiled production and storage areas. SP21 standard response, SP22 quick response.
Best forSuspended ceilingsDeflector-up on exposed branch lines — the warehouse standard. SP23 standard, SP24 quick.
Best forExposed pipeworkFlow scales with the square root of pressure at K = 11.2 GPM/psi½ (160 L/min/bar½) — check the curves per variant.
Best forHydraulic calculationDatasheet & Drawings
Each configuration has its own one-page datasheet with the spray coverage curves — download the variant you are specifying.
Test records and material certificates are supplied with your shipment.
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Frequently Asked Questions
When is an extra large orifice sprinkler the right choice?
When the system is designed by the density/area method and the required discharge density is high — the K11.2 orifice reaches the design flow at a lower pressure than a K5.6 or K8.0 head.
What does K11.2 (160) mean?
The K factor relates flow to pressure: flow equals K times the square root of pressure. A K11.2 head (160 in metric units) passes roughly twice the water of a K5.6 head at the same pressure.
Why does lower operating pressure matter?
It reduces demand on pumps and mains, compensates for friction losses on long runs, and can allow smaller pipe sizing while still meeting the required density.
Which configurations are available?
Pendent (SP21 standard / SP22 quick response) and upright (SP23 standard / SP24 quick response), all ¾" NPT with 3 mm or 5 mm glass bulbs.
Which temperature ratings can I specify?
Five ratings — 57, 68, 79, 93 and 141 °C — selected by the ambient temperature at the head location.
Engineered to order. Delivered worldwide.
Send your project requirements — hazard class, configurations, response type, temperature ratings and quantities — and our team returns a submittal package and lead time.
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