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Sanitary appliances - general requirements
86NI-wide·Technical Booklet P Sanitary Appliances Unvented Hot Water Storage and Scalding
Every sanitary appliance shall have smooth and readily cleansed, non-absorbent surfaces and shall discharge through an effective trap of suitable dimensions. Every washbasin, bath and shower shall hav
drainagenon-domesticSanitary accommodation location and access
87NI-wide·Technical Booklet P Sanitary Appliances Unvented Hot Water Storage and Scalding
Sanitary accommodation in any building other than a dwelling shall not open directly into a room used for kitchen purposes. Any sanitary accommodation which can be entered directly from a room used fo
drainagenon-domesticDischarge pipes from tundishes - General requirements
2.14NI-wide·Technical Booklet P Sanitary Appliances Unvented Hot Water Storage and Scalding
A discharge pipe from a tundish should – (a) be made of – (i) metal; or (ii) other material that has been demonstrated to be capable of safely withstanding the temperatures of the water discharged and
drainagescaldingunvented-hot-water-storageHydraulic resistance calculation for discharge pipes
2.15NI-wide·Technical Booklet P Sanitary Appliances Unvented Hot Water Storage and Scalding
In calculating the hydraulic resistance of a discharge pipe the resistance of straight lengths, elbows and bends should be taken into account. If a discharge pipe is of copper its size should be calcu
drainagescaldingunvented-hot-water-storageVisibility of discharge from safety devices
2.16NI-wide·Technical Booklet P Sanitary Appliances Unvented Hot Water Storage and Scalding
The discharge from a safety device which may consist of scalding water and steam, should be visible at the tundish and should also be visible at the final point of discharge.
drainagescaldingunvented-hot-water-storageAcceptable discharge arrangements
2.17NI-wide·Technical Booklet P Sanitary Appliances Unvented Hot Water Storage and Scalding
Acceptable discharge arrangements include – (a) below a fixed louvred grating and above the water seal in a trapped gulley (see Diagram 2.1); or (b) downward discharge at low level but no less than 10
drainagescaldingunvented-hot-water-storageexternal-spaceSizing 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