AIC TMU 500, Руководство по установке и обслуживанию, Страница: 36 / 68

G-36
Z-106164_EN ● 00
P
roduct
I
nstallatIon
600mm maximum
300mm minimum
temperature relief valve to tundish
Metal discharge pipe (D2) tundish with
continuous fall. See 3.56, Table G3 and
worked example
Tundish
Discharge below fixed
grating (3.61 gives
alternative points of
discharge)
Fixed grating
Trapped gulley
Valve outlet size
Minimum size of dis-
charge pipe D1
Minimum size of dis-
charge pipe D2 from
tundish
Maximum resistance
allowed, expressed
as a length of straight
pipe (i.e. no elbows or
bends)
Resistance created by
each elbow or bend.
G½ 15mm
22mm
28mm
35mm Up to 9m
Up to 8m
Up to 27m
0.8m
1.0m
1.4m
G¾ 22mm
28mm
35mm
42mm Up to 9m
Up to 8m
Up to 27m
1.0m
1.4m
1.7m
G1 28mm
35mm
42mm
54mm Up to 9m
Up to 8m
Up to 27m
1.4m
1.7m
2.3m
Figure G3: Typical discharge pipe arrangement
Table G3 – Sizing of copper discharge pipe ‘D2’ for common temperature relief valve outlet sizes
Example of discharge pipe sizing
Figure on previous page shows a G1/2 tempera-
ture relief valve with a discharge pipe (D2) having
4 No. 22mm elbows and length of 7m from the
tundish to the point of discharge.
From Table:
Maximum resistance allowed for a straight length
of 22mm copper discharge pipe (D2) from a G1/2
temperature relief valve is 9.0m.
î
Subtract the resistance for 4 No. 22mm elbows
at 0.8m each = 3.2m
î
Therefore the permitted length equates to:
5.8m
î
5.8m is less than the actual length of 7m there-
fore calculates the next largest size.
Maximum resistance allowed for a straight length
of 28mm pipe (D2) from a G1/2 temperature relief
valves equates to 18m.
î
Subtract the resistance of 4 No. 28mm elbows
at 1.0m each = 4.0m
î
Therefore the maximum permitted length
equates to: 14m
î
As the actual length is 7m, a 28mm (D2) cop-
per pipe will be satisfactory.