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ページを印刷するDIAGRAM 1 Typical discharge pipe arrangement
Safety device
(e.g. temperature relief valve)
maximum
Discharge pipe (D2)
from continuos fall.
see the following table
TABLE SIZING OF COPPER DISCHARGE PIPE 'D2' FOR COMMON TEMPERATURE RELIEF VALVE OUTLET SIZES
Valve outlet size
of discharge pipe D1*
G ½"
G ¾"
G 1
*see point 2 and 9 and Diagram 1
Note: The above table is based Dn copper pipe. Plastic pipes nay be cf different bore and res stance.
Sizes and maximum lengths of plastic should be calculated using cata prepared for the type of pipe ceing used.
Worked example:
The example below is fora G ½" temperature relief valve with a discharge pipe (D2) having 4 No. 22 mm elbows and length of 7 m from the
tundish to the point of discharge.
From Table:
Maximum resistance allowed for a straight length of 22 mm copper discharge pipe (D2) from a G ½" temperature relief valve is: 9.0 m
Subtract the resistance for 4 No. 22 mm elbows at 0.8 m each = 3.2 m
Therefore the maximum permitted length equates to 5.8 m which, is less than the actual length of 7 m therefore calculate the next largest size.
Maximum resistance allowed for a straight length of 28 mm copper discharge pipe (D2) from a G ½" temperature relief valve is: 18 m
Subtract the resistance for 4 No. 28 mm elbows at 1.0 m each = 4m
Therefore the maximum permitted length equates to: 14 m
As the actual length is 7 m, a 28 mm (D2) copper pipe will be satisfactory.
14 /EN
Metal discharge pipe (D1)
from temperature relief valve tundish
600mm
Tundish
300mm
minimum
Minimum size
of discharge pipe D2*
15 mm
22 mm
28 mm
Maximum resistance
Minimum size
allowed, expressed
as a length of straight pipe
from tundish
(i.e. no elbows or bends)
22 mm
28 mm
35 mm
28 mm
35 mm
42 mm
35 mm
42 mm
54 mm
Discharge below fixed grating
provides alternative
discharge points
see next paragraphs
Fixed grating
Trapped gully
Resistance created by
each elbow or bend
Up to 9 m
Up to 10 m
Up to 27 m
Up to 9 m
Up to 13 m
Up to 27 m
Up to 9 m
Up to 13 m
Up to 27 m
0.3 m
1.0 m
1.4 m
1.0 m
1.4 m
1.7 m
1.4 m
i.7 m
2.3 m