SCR Surface Temperatures
Position Thickness of
Heat Insulation
at exhaust temper-
ature of 350 °C
(662 °F) at the
SCR-muffler inlet
at exhaust temper-
ature 450 °C (842 °
F) at the SCR-muf-
fler inlet
Casing – all round Muffler filled with
insulation
75 °C (167 °F) 125 °C (257 °F)
End wall – in/outlet side 20 mm (0.78 in) 100 °C (212 °F) 150 °C (302 °F)
End wall – other side 20 mm (0.78 in) 125 °C (257 °F) 200 °C (392 °F)
Mounting strap area No insulation 225 °C (437 °F) 300 °C (572 °F)
The MACK SCR system is simple and effective, with few components. It consists of a aftertreatment DEF tank positioned
near the standard diesel tank, plus a aftertreatment DEF pump, aftertreatment DEF Dosing valve and a SCR catalyst. The
advantage of using DEF is that it enables the engine to use less exhaust gas recirculation (EGR) gases – and higher oxygen
levels – for better combustion, while meeting the EPA near-zero NOx emissions requirement of 0.2 g/hp-hr NOx. By using
DEF, we avoid the disadvantages of increasing EGR to massive levels. This results in better fuel economy from your MACK
engine.
W2055490
W2055491
W2116335
Vertical SCR, side inlet Vertical SCR, bottom inlet Vertical SCR, side inlet and outlet
W2055492
W2055493
Horizontal SCR, full size Horizontal SCR, compact size
Mack Body Builder Instructions CHU, CXU, GU, TD, MRU, LR
USA139046859 Date 5.2017 Body Builder; Engine, MP7, MP8, and MP10 Page 16 (43)
All Rights Reserved
To Next Page
Loading...
