Dimplex SUTP Mid Range Installation Manual page 6

4.8 Connection arrangement for SUTP Mid Range Cylinder
1
MAINS COLD WATER SUPPLY (15mm)
2
STOP COCK (NOT SUPPLIED)
3
PRESSURE REDUCING VALVE
4
CHECK VALVE if supplied separately (included in RWC expansion relief valve)
5
EXPANSION RELIEF VALVE - SET 6 BAR
6
DISCHARGE PIPE 22mm DIA (SEE SECTION 7)
7
DRAIN COCK (Not Supplied)
8
TUNDISH
9
EXPANSION VESSEL
4.9. Discharge arrangement.
The Tundish must be installed in a position so that it is clearly visible by the user. In addition, the
discharge pipe from the Tundish should terminate in a safe place where there is no risk to persons in
the vicinity of the discharge, be of metal and:
(a) Be at least one pipe size larger than the normal outlet size of the safety device unless its total
equipment hydraulic resistance exceeds that of a straight pipe 9 m long, i.e. discharge pipes between 9
m and 18 m equivalent resistance length should be at least two sizes larger then the normal outlet size
of the safety device, between 18 m and 27 m at least three sizes larger and so on. Bends must be taken
into account in calculating the flow resistance. Refer to the diagram, tables and worked example
detailed in Fig 2.
Fig 1
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