Mixing unit with urea lance
Mix-
ing
unit
Engine power
approximately
Mixing pipe
1)
Length
straight mix-
ing pipe (L)
No.
kW DN mm
1 0 – 1,000 500 3,400
2 1,001 – 2,000 600 3,400
3 2,001 – 3,000 800 3,550
4 3,001 – 4,200 1,000 3,650
5 4,201 – 5,400 1,100 3,700
6 5,401 – 6,800 1,200 3,800
7 6,801 – 8,500 1,400 3,850
8 8,501 – 10,500 1,500 4,000
9 10,501 –
13,000
1,600 4,400
10 13,001 –
20,000
2,100 4,610
11 20,001 –
21,600
2,300 5,010
1)
Diameter mixing pipe differs from exhaust pipe diame-
ter.
Table 2: Mixing unit with urea lance
Dosing unit
Dosing
unit
Height Width Depth Weight
No.
mm mm mm kg
1 800 800 300 80
Table 3: Dosing unit
SCR control cabinet
Control
cabinet
Height Width Depth Weight
No.
mm mm mm kg
1 2,100 800 400 220
Table 4: SCR control cabinet
Pump module
Pump
module
Height Width Depth Weight
No.
mm mm mm kg
1 1,300 700 300 120
Table 5: Pump module
Compressed air reservoir module
Air mod-
ule
Height Width Depth Weight
No.
mm mm mm kg
1 1,050 1,500 500 250
Table 6: Compressed air reservoir module
Waste gate
The waste gate is used to by-pass the turbine of
the turbocharger with a part of the exhaust gas.
This leads to a charge air pressure reduction and
the temperature after turbine is increased.
For plants with an SCR catalyst, waste gate is nec-
essary in order to ensure proper performance of
SCR.
In case the temperature before SCR falls below the
set minimum exhaust gas temperature value, the
waste gate is opened gradually in order to blow-off
exhaust gas before the turbine until the exhaust gas
temperature before the SCR catalyst has reached
the required level.
Figure 4: Overview flaps
MAN Diesel & Turbo
B1600 0
SCR (Selective Catalytic Reduction)
3700467-8.1
Page 8 (17)
V28/32S, L28/32S, L28/32H, L27/38S, L27/38, L23/30S, L23/30H, L21/31S,
L21/31, L16/24S, L16/24
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