A Type DC arrangement comprises of a pipe interrupter with shrouded, permanently unrestricted air inlets (Type DC device) installed not less than 150 mm above the sparge outlet of a urinal or 300 mm (150 mm In Scotland) above the spillover of a WC pan or any other receiving vessel, discharging vertically downwards to an open outlet i.e. no method of flow control.
A Type DC arrangement is rated by the Regulators as suitable backflow protection against the highest level of contamination, fluid category 5 but for back siphonage only.
Type DC arrangement should be inspected, and as necessary maintained every 6 months (BS EN 806: 5)
Type DC device
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