SCR Surface Temperatures 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 PI / CHU, AN / CXU, GR / GU, TD, LR, TE / MRU USA141023213 Date 2.2018 Body Builder; Engine, MP7, MP8, and MP10 Page 16 (40) All Rights Reserved 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)