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NI-wide·Technical Booklet P Sanitary Appliances Unvented Hot Water Storage and Scalding
Technical Booklet P: 2012 Sanitary appliances, unvented hot water storage systems and reducing the risk of scalding
non-domesticdwellingsanitary-applianceshot-water-storagescalding-riskTundish installation and discharge requirements
2.13NI-wide·Technical Booklet P Sanitary Appliances Unvented Hot Water Storage and Scalding
Each temperature relief valve and expansion valve should discharge through a metal pipe either individually, or via a manifold, to a tundish incorporating an air break. Where the discharge is individu
unvented-hot-watersafety-dischargescalding-riskaccessibilitySizing of copper discharge pipe D2 for temperature relief valves
Table 2.1NI-wide·Technical Booklet P Sanitary Appliances Unvented Hot Water Storage and Scalding
Valve outlet size Minimum size of discharge pipe D1* Minimum size of discharge pipe D2* from tundish Maximum resistance allowed, expressed as a length of straight pipe (i.e. no elbows or bends) Resist
drainagescalding-riskWorked example for discharge pipe sizing
NI-wide·Technical Booklet P Sanitary Appliances Unvented Hot Water Storage and Scalding
The example below is for a G1/2 temperature relief valve with a discharge pipe (D2) having 4 No. elbows and a length of 7 m from the tundish to the point of discharge. From Table 2.1. Maximum resista
drainagescalding-riskTypical discharge pipe arrangement
Diagram 2.1NI-wide·Technical Booklet P Sanitary Appliances Unvented Hot Water Storage and Scalding
Diagram 2.1 Typical discharge pipe arrangement showing: metal discharge pipe (D1) from temperature relief valve to tundish (300 mm minimum / 500 mm maximum tundish); metal discharge pipe (D2) from tun
drainagescalding-risk