Typical discharge pipe arrangement
Safety device
(eg. temperature relief value).
500 mm maximum
300 mm minimum
Metal discharge pipe (D1) from temperature relief
valve to tundish.
Tundish
Metal discharge pipe (D2) from tundish, with
continuous fall.
See Building Regulation G3 section 3.9d i-iv,
Tabel 4 and worked example.
Discharge below fixed grating
(Building Regulation G3 section
3.9d gives alternative points of
discharge).
Fixed louvred grating
Trapped gully
2.3.1 Sizing of copper discharge pipe ’D2’ for common temperature relief valve outlet sizes
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 (ei. no elbows or bends)
Resistance created by
each elbow or bend
G½
15 mm
22 mm
28 mm
35 mm
up to 9 m
up to 18 m
up to 27 m
0.8 m
1.0 m
1.4 m
G¾
22 mm
28 mm
35 mm
42 mm
up to 9 m
up to 18 m
up to 27 m
1.0 m
1.4 m
1.7 m
G1
28 mm
35 mm
42 mm
54 mm
up to 9 m
up to 18 m
up to 27 m
1.4 m
1.7 m
2.3 m
SECTION I: TANK INSTALLATION
SECTION I: TANK INSTALLATION
8 VELUX
Содержание TFF 200
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