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AA air gap
AA air gap
A non-mechanical backflow prevention arrangement of water fittings where water is discharged through an air gap into a receptacle which has at all times an unrestricted spillover to atmosphere.
A non-mechanical backflow prevention arrangement of water fittings where water is discharged through an air gap into a receptacle which has at all times an unrestricted spillover to atmosphere.
Maximum permissible fluid category against which a Type AA air gap is accepted as adequate backflow protection:
Maximum permissible fluid category against which a Type AA air gap is accepted as adequate backflow protection:
Backflow by back pressure: fluid category 5
Backflow by back pressure: fluid category 5
Backflow by back siphonage: fluid category 5
Backflow by back siphonage: fluid category 5
Interpretation given in Regulators’ Backflow Specification - backflow prevention arrangements and devices: backflow prevention arrangements
Interpretation given in Regulators’ Backflow Specification - backflow prevention arrangements and devices: backflow prevention arrangements
AB air gap with weir
AB air gap with weir
A non-mechanical backflow prevention arrangement of water fittings complying with Type AA, except that the air gap is the vertical distance from the lowest point of the discharge orifice which discharges into the receptacle, to the critical water level of the rectangular weir overflow.
A non-mechanical backflow prevention arrangement of water fittings complying with Type AA, except that the air gap is the vertical distance from the lowest point of the discharge orifice which discharges into the receptacle, to the critical water level of the rectangular weir overflow.
Maximum permissible fluid category against which a Type AB air gap is accepted as adequate backflow protection:
Maximum permissible fluid category against which a Type AB air gap is accepted as adequate backflow protection:
Backflow by back pressure: fluid category 5
Backflow by back pressure: fluid category 5
Backflow by back siphonage: fluid category 5
Backflow by back siphonage: fluid category 5
Note: overflow and warning pipes shall discharge through or terminate with an air break, the dimensions of which should satisfy a Type AA air gap.
Note: overflow and warning pipes shall discharge through or terminate with an air break, the dimensions of which should satisfy a Type AA air gap.
Interpretation given in Regulators’ Backflow Specification - backflow prevention arrangements and devices: backflow prevention arrangements
Interpretation given in Regulators’ Backflow Specification - backflow prevention arrangements and devices: backflow prevention arrangements
AG air gap
AG air gap
A non-mechanical backflow prevention arrangement of water fittings with an air gap; together with an overflow, the size of which is determined by measure or a vacuum test.
A non-mechanical backflow prevention arrangement of water fittings with an air gap; together with an overflow, the size of which is determined by measure or a vacuum test.
Maximum permissible fluid category against which a Type AG air gap is accepted as adequate backflow protection:
Maximum permissible fluid category against which a Type AG air gap is accepted as adequate backflow protection:
Backflow by back pressure: fluid category 3
Backflow by back pressure: fluid category 3
Backflow by back siphonage: fluid category 3
Backflow by back siphonage: fluid category 3
Note: overflow and warning pipes shall discharge through or terminate with an air break, the dimensions of which should satisfy a Type AA air gap.
Note: overflow and warning pipes shall discharge through or terminate with an air break, the dimensions of which should satisfy a Type AA air gap.
Interpretation given in Regulators’ Backflow Specification - backflow prevention arrangements and devices: backflow prevention arrangements
Interpretation given in Regulators’ Backflow Specification - backflow prevention arrangements and devices: backflow prevention arrangements
AUK1
AUK1
A non-mechanical backflow prevention arrangement consisting of a cistern with a Type AG overflow and an air gap; the spill-over level of the receiving vessel (WC pan or other receptacle) being located not less than 300 millimetres below the overflow pipe and not less than 15 millimetres below the lowest level of the interposed cistern.
A non-mechanical backflow prevention arrangement consisting of a cistern with a Type AG overflow and an air gap; the spill-over level of the receiving vessel (WC pan or other receptacle) being located not less than 300 millimetres below the overflow pipe and not less than 15 millimetres below the lowest level of the interposed cistern.
Maximum permissible fluid category against which a Type AUK1 air gap is accepted as adequate backflow protection:
Maximum permissible fluid category against which a Type AUK1 air gap is accepted as adequate backflow protection:
Backflow by back pressure: fluid category 3
Backflow by back pressure: fluid category 3
Backflow by back siphonage: fluid category 5
Backflow by back siphonage: fluid category 5
Note: overflow and warning pipes shall discharge through or terminate with an air break, the dimensions of which should satisfy a Type AA air gap.
Note: overflow and warning pipes shall discharge through or terminate with an air break, the dimensions of which should satisfy a Type AA air gap.
Interpretation given in Regulators’ Backflow Specification - backflow prevention arrangements and devices: backflow prevention arrangements
Interpretation given in Regulators’ Backflow Specification - backflow prevention arrangements and devices: backflow prevention arrangements
AUK2
AUK2
The height of air gap between the lowest part of the outlet of a tap, combination fitting, shower head or other fitting discharging over a domestic sanitary appliance or other receptacle, and the spillover level of that appliance, where a fluid category 2 or 3 risk is present downstream.
The height of air gap between the lowest part of the outlet of a tap, combination fitting, shower head or other fitting discharging over a domestic sanitary appliance or other receptacle, and the spillover level of that appliance, where a fluid category 2 or 3 risk is present downstream.
Maximum permissible fluid category against which a Type AUK2 tap gap is accepted as adequate backflow protection:
Maximum permissible fluid category against which a Type AUK2 tap gap is accepted as adequate backflow protection:
Backflow by back pressure: not acceptable for protection against back pressure from any fluid category
Backflow by back pressure: not acceptable for protection against back pressure from any fluid category
Backflow by back siphonage: fluid category 3
Backflow by back siphonage: fluid category 3
Interpretation given in Regulators’ Backflow Specification - backflow prevention arrangements and devices: backflow prevention arrangements
Interpretation given in Regulators’ Backflow Specification - backflow prevention arrangements and devices: backflow prevention arrangements
AUK3
AUK3
The height of an air gap between the lowest part of the outlet of a tap, combination fitting, shower head or other fitting discharging over any appliance or other receptacle, and the spillover level of that appliance, where a fluid category 4 or 5 risk is present downstream.
The height of an air gap between the lowest part of the outlet of a tap, combination fitting, shower head or other fitting discharging over any appliance or other receptacle, and the spillover level of that appliance, where a fluid category 4 or 5 risk is present downstream.
Maximum permissible fluid category against which a Type AUK3 tap gap is accepted as adequate backflow protection:
Maximum permissible fluid category against which a Type AUK3 tap gap is accepted as adequate backflow protection:
Backflow by back pressure: not acceptable for protection against back pressure from any fluid category
Backflow by back pressure: not acceptable for protection against back pressure from any fluid category
Backflow by back siphonage: fluid category 5
Backflow by back siphonage: fluid category 5
Interpretation given in Regulators’ Backflow Specification - backflow prevention arrangements and devices: backflow prevention arrangements
Interpretation given in Regulators’ Backflow Specification - backflow prevention arrangements and devices: backflow prevention arrangements
Back pressure and Back siphonage
Back pressure and Back siphonage
Back pressure-if the pressure downstream is higher than the pressure upstream then back pressure can occur.
Back pressure-if the pressure downstream is higher than the pressure upstream then back pressure can occur.
Back siphonage-if the pressure downstream is higher than the pressure upstream, example...if a hose from a shower is dropped in a bath with contaminated water then back siphonage can occur.
Back siphonage-if the pressure downstream is higher than the pressure upstream, example...if a hose from a shower is dropped in a bath with contaminated water then back siphonage can occur.
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