Discharge Pipe Arrangement - Danfoss DHP-A Installation Instructions Manual

3.3

Discharge pipe arrangement

DD B D
The tundish must be positioned away from any electrical devices .
D D DD
The tundish must be installed so that it is visible to the occupants .
Figure 7. The principal installation solution of the discharge pipe assembly.
Position Name
1 Safety device (for example, temperature relief valve)
2 Metal discharge pipe from safety device to tundish
3 Tundish
4 Discharge pipe from tundish, with continuous fall (1 in 200)
5 Discharge below fixed grating
6 Trapped gully
Sizing of copper discharge pipe (4) for common temperature relief valve outlet sizes
Minimum
Valve size of dis-
outlet charge pipe
size (2)
G1/2 15 mm
G3/4 22 mm
G1 28 mm
1
2
600 mm maximum
300 mm minimum
Minimum size of
discharge pipe (4
from tundish)
22 mm
28 mm
35 mm
28 mm
35 mm
42 mm
35 mm
42 mm
54 mm
3
4
Maximum resistance allowed,
expressed as a length of
straight pipe (that is, no
elbows or bends)
Up to 9 m
Up to 18 m
Up to 27 m
Up to 9 m
Up to 18 m
Up to 27 m
Up to 9 m
Up to 18 m
Up to 27 m
5
6
Resistance created by
each elbow or bend
0 .8 m
1 .0 m
1 .4 m
1 .0 m
1 .4 m
1 .7 m
1 .4 m
1 .7 m
2 .3 m
Appendix UK – 13