Figure 2
- Allowable Overhung Loads for V-belt Drives for Tri-RAM Blowers - Models 409 thru 832
Model
Dimen-
sion A
Inch (mm)
Max
Allowable
Shaft Load
lb
•
in
(kg
•
mm)
Min
Sheave
Diameter
Inch (mm)
Max
Sheave
Width
Inch (mm)
409, 413,
416
1.90 (48.3)
5,100
(58.9)
7.1 (180)
3.06 (78)
617, 621
2.11 (53.6)
10,000
(115)
8.5 (215)
4.44 (112)
722, 728
2.44 (62)
13,000
(150)
11.80
(300)
4.43 (112)
826, 832
3.03 (77)
21,000
(242)
13.2 (335)
7.19 (183)
NOTE:
Arc of sheave belt contact on the smaller sheave not to be less than 170°.
Driver to be installed on the inlet side for vertical units, and on the drive shaft
side for horizontal units.
Roots recommends the use of two or more 3VX, 5VX or 8VX matched or
banded belts and sheaves.
1/4" Max (6.3 mm Max)
A
Manual Discharge Unloading Valve
Inlet Air Filter
Manometers
Temporary Screen
Expansion Joint
AIR BLOWER
Expansion Joint with Control Unit
Differential Pressure &
Temperature Switches
Discharge Silencer
Temperature Gauge
Isolation Valve
with Limit Switch
Check Valve
Pressure Relief Valve
Back Pressure
Regulator (optional)
Vacuum Relief Valve
Inlet
Silencer
Temperature Gauge
11
GEA19684 ISRB_2008 rev._11.15
*Belt Pull in lbs =
27500 • Motor BHP
Blower RPM• Sheave Diameter in inches
Shaft load (lb•in) = Belt Pull (lbs) • (A" + ¼
"
+ )
Sheave Width (")
2
*Belt Pull in kg =
4,255,000 • Motor KW
Blower RPM• Sheave Diameter in mm
Shaft load (kg
•
mm) = Belt Pull (kg) • (Amm + 6.3mm + )
Sheave Width (mm)
2
1000
*Based on SF = 1.4 for v-belt drives. If higher SF belt is used, belt load should be increased proportionally and may exceed limits of the blower.
Figure 3
- Air Blower Installation with Accessories
Above are suggested locations for available accessories.
GEA19684_ISRB-2008_Tri-RAM_rev02.16.indd 11
15/02/2016 11:17:06
Summary of Contents for Roots Tri-RAM 409
Page 1: ...www howden com RootsTM Tri RAMTM Tri lobe Blowers Installation Operation Maintenance Manual ...
Page 15: ...15 GEA19684 ISRB_2008 rev _11 15 Assembly of Tri RAM Tri Lobe Blowers Models 409 413 416 ...
Page 16: ...GEA19684 ISRB_2008 rev _11 15 16 Assembly of Tri RAM Tri Lobe Blowers Models 617 621 ...
Page 18: ...GEA19684 ISRB_2008 rev _11 15 18 Assembly of Tri RAM Tri Lobe Blowers Models 722 and 728 ...
Page 20: ...GEA19684 ISRB_2008 rev _11 15 20 Assembly of Tri RAM Tri Lobe Blowers Models 826 832 ...
