Hose Reel, Landing Valve & Wet Riser Lab
Lay out hose reels and landing valves on a floor plate and see the uncovered areas light up. Then run the wet riser up the building, find the floors that need pressure reducing valves or a new pressure zone, and check the hose reel supply.
How to use: press Auto place, then drag any reel or valve and watch the coverage update. Tap i for plain explanations.
1. Floor and equipment
A rectangular floor plate with an allowance for walls and furniture.
2. Coverage plan
Drag reels or valves. Red cells are out of reach. Tap a point twice to delete it.
3. Checks
4. Pressure up the riser
Static pressure (pump at churn) and residual pressure (pump at flow) at every landing valve, with pressure reducing valves and zones marked.
5. How it works
Coverage
A hose reel covers every point within its hose length plus a short jet, measured along the route a person would walk. The route factor shrinks the straight-line reach to allow for walls, doors and furniture. Landing valves cover the travel distance the fire brigade hose can reach, for example 61 m in NFPA 14 for unsprinklered floors or the distance in your authority's code.
Static and residual pressure
With no flow, the pump churn pressure falls by 0.0981 bar for every metre of height. That static pressure is the worst case for the lower floors: above 12.1 bar (175 psi) NFPA 14 needs pressure regulating devices on the outlets. With water flowing, friction in the riser also eats pressure, so the top outlets must still have the minimum residual: 6.9 bar for 65 mm Class I outlets, 4.5 bar for 40 mm Class II hose.
Pressure zones
When the bottom floors are too high and the top floors too low at the same time, one pump cannot serve the whole height. Split the riser into zones with separate pumps, or with a break tank or pressure reducing station partway up.
Learning and checking tool. Final layouts must follow the authority's code, the fire strategy and the equipment data sheets.