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INDUSTRIAL GENERATOR SETS — APPLICATION & INSTALLATION MANUAL — REV. #4 (09/07/07) — PAGE 49
MECHANICAL INSTALLATION — EXHAUST SYSTEM
Exhaust System Installation Reference Data
The following Tables are provided for reference when installing the exhaust system.
Table 19. Equivalent Lengths of Pipe Fittings (Feet)
Type of Fitting
Nominal Diameter (Inches)
22.533.54 5 6 81012
Standard Elbow 5.3 6.4 8.1 9.6 11 14 16 21 26 32
Medium Elbow 4.6 5.4 6.8 8 9 12 14 18 22 26
Long Radius Elbow 3.5 4.2 5.2 6 7 9 11 14 17 20
45° Elbow 1.5 2 2.3 2.6 3 4 4.5 6 8 9
Standard Tee 13141719222734445667
18 Inch Flexible Tube3333333333
24 Inch Flexible Tube4444444444
Table 20. Heat Losses from Uninsulated Exhaust
Pipes and Mufflers
Pipe Diameter
Inches (mm)
Heat From Pipe
BTU/MIN-FOOT
(kj/Min-Metre)
Heat From Muffler
BTU/MIN (kj/Min)
1.5 (38) 47 (162) 297 (313)
2 (51) 57 (197) 490 (525)
2.5 (64) 70 (242) 785 (828)
3 (76) 84 (291) 1,100 (1,160)
3.5 (98) 96 (332) 1,408 (1,485)
4 (102) 108 (374) 1,767 (1,864)
5 (127) 132 (457) 2,500 (2,638)
6 (152) 156 (540) 3,550 (3,745)
8 (203) 200 (692) 5,467 (5,768)
10 (254) 249 (862) 8,500 (8,968)
12 (305) 293 (1,014) 10,083 (10,638)
Table 17. Factory Recommended Engine Exhaust Silencers
MQ Power
Generator Model
Number
Silencer
Manufacturer
Name
Silencer
Model
Number
Inlet/Outlet
Diameter
In. (mm)
Maximum
Allowable
Back-Pressure
Inches-WC
Total Weight of
Sliencer
lbs. (Kg.)
MQP20IZ
SILEX JB-2.5 2.5 (63.5) 41 27 (12.15)
MQP30GM
NETT EE48968 3 (76.2) 50 50 (22.67)
MQP30DZ
SILEX JB-2.5 2.5 (63.5) 41 27 (12.15)
MQP40IZ
SILEX JB-2.5 2.5 (63.5) 41 27 (12.15)
MQP45GM
NETT EE49242 3 (76.2) 50 75 (34.05)
MQP50IZ
SILEX JB-2.5 2.5 (63.5) 41 27 (12.15)
MQP60GM
NETT EE48969 3 (76.2) 50 85 (38.5)
MQP60IV
SILEX JB-2.5 2.5 (63.5) 41 27 (12.15)
MQP80GM
NETT EE48970 3 (76.2) 50 100 (45.4)
MQP80IV
COWL TS30TR 3 (76.2) 20 34 (15.42)
MQP100GM
NETT EE49243 3 (76.2) 50 100 (45.4)
MQP100IV
COWL TS30TR 3 (76.2) 28 34 (15.42)
MQP125IV
COWL TS40TR 4 (101.6) 28 50 (22.67)
MQP150IV COWL TS40TR 4 (101.6) 28 50 (22.67)
MQP175IV
COWL TS45TR 4.5 (114.3) 40 60 (27.21)
MQP200IV
COWL TS45TR 4.5 (114.3) 40 60 (27.21)
MQP250IV
TBD
MQP300IV
COWL TS60TR 6 (152.4) 40 94 (42.63)
MQP350IV
COWL TS60TR 6 (152.4) 40 94 (42.63)
MQP400IV
TBD
MQP450VO
COWL TS80TR 8 (203.2) 28 162 (73.5)
MQP500VO
COWL TS80TR 8 (203.2) 28 162 (73.5)
MQP550VO
COWL TS80PR 8 (203.2) 40 154 (70.0)
MQP600VO
COWL TS80PR 8 (203.2) 40 154 (70.0)
Table 18. Cross-Sectional Areas of Openings of Various Diameter
Diameter of
Muffler Inlet (In.)
Area of Muffler
Inlet (FT
2
)
Diameter of
Muffler Inlet (In.)
Area of Muffler
Inlet (FT
2
)
2 0.0218 5 0.1363
2.5 0.0341 6 0.1963
3 0.0491 8 0.3491
3.5 0.0668 10 0.5454
4 0.0873 12 0.7854