Technical Booklet P Sanitary Appliances Unvented Hot Water Storage and Scalding·Page 16·Diagram 2.1
Typical discharge pipe arrangement
Diagram showing the layout of discharge pipes from a temperature relief valve through a tundish to final discharge point, including pipe sizes, tundish dimensions, and grating location requirements.
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 tundish with continuous fall (see Table 2.1 and worked example); fixed louvred grating (see para 2.14(d) and 2.17(a)); discharge below fixed grating or as para 2.17(b); trapped gulley; safety device (e.g. temperature relief valve).
Source — /Users/richardhill/Documents/planning-arch-project/data/documents/regional/Technical Booklet P - Sanitary Appliances Unvented Hot Water Storage and Scalding.pdf