Ventilated Discharge Brunch System
- Main Ventilating Stack joins the main ventilating stack above the spill over level for the appliances
- Each appliance has its waste vented
- Brunch Ventilating Pipe:
- MIN 25mm if < than 15m
- 32mm if > 15m or > 5 bends or serves > 1 appliance
- 750mm MAX from the trap to the vent pipe
- ifindplumbers
< Go Back | 2013-08-18 |
Stub Stack System
- preferred where the numbers of sanitary appliances and their distance to a discharge stack are large
- NO WC connected above 1.3m from the invert of the drain
- On the stub stuck system the MAX height above the invert to the centre of WC bunch is 1.5m
- MAX 2m from the invert to the highest brunch connection
- Stub Waste connection – direct waste pipe connection to the drainage system
- The top of the Stub Stack SHOULD be finished with End Cup (Screwed Access Plug) or Air Admittance Valve (CAN terminate inside a building)
- Stub stacks may also be used on upper floors where the discharge from the stack is to a ventilated soil stack.
< Go Back | 2013-08-18 |
Primary Vented Stack System
- previously known as the single stack system
- Installed in most new buildings and domestic premises
- NO separate ventilation pipe required
- The discharge stack and branch pipes are sized to avoid the need for separate ventilating pipes
- There are limits on length, diameters, gradients and branch waste pipes
- ​ this system saves space and costs
- The distances of sanitary fittings can be exceeded if using resealing (or antisiphon) traps and branch pipe air admittance valves
- Appliances SHOULD be grouped closely together
- BS EN 12056-2 allows external pipework on buildings up to three storeys
- To minimise noise transmission it's recommended 25 mm of insulation around soil pipes passing through a bedroom or living room.
< Go Back | 2013-08-18 |
Secondary Ventilated Stack System
- The venting stack is usually half diameter of the discharge stuck
- Appliances SHOULD be grouped closely together
- Separate ventilating overcomes pressure fluctuations that could cause trap seals to be lost
< Go Back | 2013-08-18 |