Glossary
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Air Admittance Stack
Valve that allows air to enter the system but not to escape in order to limit pressure fluctuations within the sanitary pipework.Bar (accidental static water pressure)
Measurement of pressure, 1 bar is approximately equal to 14.7psi. Accidental refers to - If a blockage in the pipe system occursBlack Water
Waste water containing faecal matter or urineBranch Discharge Pipe
Pipe connecting sanitary appliances to a discharge stack or drainBranch Ventilating Pipe
Ventilating pipe connected to a branch discharge pipe.Cast Iron
Alloy of cast iron and carbon in which graphite can be present in different forms.Combined System
A drainage system for both rain and waste water in a single pipeConnection Bend
First fitting in direction of flow after trap outlet.Depth of Water Seal
The depth of water which would have to be removed from a fully charged rap before gases and odours at atmospheric pressure could pass through the trap.Discharge Stack
Main (generally vertical) pipe, conveying discharge from sanitary appliancesDomestic Sanitary Appliances
Fixed appliances supplied with water and used cleaning or washing. For example: baths, showers, wash basins, bidets, WCs, urinals, sinks, dishwashers, washing machines.Domestic Water
Water which is contaminated by use and normally discharged from WC, shower, bath, bidet, wash basin, sink, floor gully.Drain
Near horizontal pipe suspended within a building or buried in the ground to which stacks or ground floor appliances are connected.Drainage System
A system composed of drainage equipment, and other components collecting waste water and Discharging by means of gravity; effluent lifting plant may be part of a gravity drainage System.Electrical Continuity
In situations where equip potential bonding (eathring) is requiredThe earthing of the pipe system.External Diameter
Mean external diameter of the pipe barrel at any cross-sectionFlood Level
The maximum level to which waste water can rise in a drainage systemFloor Gully
Discharge fitting intended to receive water from floors either through apertures in a grating or from pipes connected to the body of the gully. A gully may include a trap.Grey Water
Waste water not containing faecal matter or urineInternal Diameter (ID)
Mean internal diameter of the pipe barrel at any cross-section.Minimum Internal Diameter
Smallest internal diameter allowed with maximum toleranceNominal Diameter (dn or dia)
Numerical designation of size which is a convenient round number approximately equal to the Diameter in mmNon-Domestic Sanitary Appliances
Special sanitary appliances used in commercial kitchens, laundries, laboratories, hospitals, hotels, swimming pools etc.Rain Water
Water resulting from natural precipitation that has not been deliberately contaminated.Restrained
Pipework (pipes and fittings) prevented from moving eg. Bracketed - In areas particular where high internal pressures could occur eg rainwater systemsSanitary Pipework
Arrangement of discharge pipework , with or without ventilating pipes, connected to a Drainage systemSeparate System
A drainage system for draining rain and waste water separately by dedicated pipework.Sewer
Systems of pipes designed to collect waste water and rainwater from buildings and surface water and to convey them to the point of disposal or treatment.Square Entry
Equal branch junction that is more than 45deg, or has a centre line radius less than the internal pipe diameterStack Offset
Non-vertical part of a discharge stackStack Vent
Extension of a vertical discharge pipe above the highest branch discharge pipe connection that terminates in an end, open to the atmosphereSwept Entry
Equal branch junction that is 45deg or less, or has a centre line radius not less than the internal pipe diameterTrade Effulent
Water after industrial use and processes contaminated/polluted water including cooling waterTrap
Device that prevents the passage of foul air by means of water seal.Ventilating Pipe
Pipe provided to limit pressure fluctuations within the discharge pipe systemVentilating Stack
Main vertical ventilating pipe, connected to a discharge stack, to limit pressure fluctuations within the discharge stack.Waste Water
Water which is contaminated by use and all water discharging into the drainage system, e.g. domestic and trade effluent, condensate water and also rainwater when discharged in a water drainage system.