Rulmeca Motorized Pulley Power Calculation Program - Standard Version 7.

23
Specifier Sheet and Recommendation Summary
02/22/15
Date

Telephone

Telefax

6508-B Windmill Way

Wilmington, NC 28405
Ph 910-794-9294
Fax 910-794-9296
www.rulmecacorp.com

e-mail

#
##
Head
Head

Copyright - Rulmeca Corp.

Project Name

Conveyor Reference

StandardLoading
Loading
Conditions:
Standard
Conditions
Conveyor Length (ft)
Tonnage Rate (tons/hour)
Belt Speed (fpm)
Material
Material Lift
Lift Height
Height (ft)
(ft)
Ambient temperature (F) Min
Ambient temperature (F) Max
Initial
Initial Velocity
Velocity of
of Material
Material (fpm)
(fpm)
Number of Belt Cleaners
Number of Return Belt Scrapers
Length of Skirt Zone (ft)
Depth
in skirt
zone
(in) (in)
Depth of
of Mat'l
Material
in Skirt
Zone
Number of Non-driven Pulleys

3300 ft
Limestone, pulv.,dry,

Bulk Density (pcf)

Size Consist

Tail

belt width

Go to Trajectory Sheet

18 in

100
500
300
0.0
-10
100
0
1
0
12
3
4

Elev. Above Sea Level (ft)

Mat'l, friction coeff

Return Run

Go to Design Parameters

0.128

REQUIRED
REQUIRED POWER:
POWER

7.3 HP

24 in
30 in

BELT PULL SUMMARY:

Standard Loading Belt Pull
Extra pull for Hopper (if any)
Extra pull for Slider Bed (if any)
Extra pull for Diverter or Tripper (if any)
TOTAL Required Belt Pull (Te):

Force (lbs)
731
0
0
0
731

36 in
42 in

###

Limestone, pulv
km

Ashes, coal, dr

Bauxite, ground

RECOMMENDED OPTIONS:

Cement, Portla

Cement clinker

Clay,
Coal, ceramic,
bitum. mid

SPECIAL NOTES:

Cullet (broken g

Go to Design Parameters

Minimum allowable belt width for lump size is 12 in

Grains,wheat,c

#NAME?

Limestone, crushed, 90 pcf

Gravel, bank ru

Avg is 50% Max Lump Size

Max. Lump Size (in)

Iron Ore,
*A smaller pulley diameter may cause belt carcass or fastener damage.

Limestone, pulv

RECOMMENDED "SINGLE DRIVE" MOTORIZED PULLEY:

Phosphate rock

Power:

7.5HP

Models Available:

Salt, dry fine,

220, 320, 400, 500, 630

Material
Surcharge
Angle
Material
Surcharge
Angle
Belt Width

25 deg.

Belt Carcass Type

Fabric

Belt Speed:

300 FPM

Idler Roll diameter

5 in

Face Width:

37.4 in.

36 in

4 ft

##
#

Angle of Wrap**

180 degrees

Type of Lagging

Full Lagging

Type of Take-up

Manual

Belt Speed:

300 FPM

2 ply, 225 piw

Head

Face Width:

37.4 in.

Type of Belt
Drive Location
Material
Material Flow
Flow

Wood chips,

CEMA
CEMA Type
Type
Troughing Idler Spacing

Elevating or Horizontal

Condition of Idlers & Pulleys

Type
if any
Type of
of Dual
Dual Drive,
Drive (if
any)

well maintained

RECOMMENDED "DUAL DRIVE" MOTORIZED PULLEY:

Power:
5.5 HP/each
Models Available:

Power savings - 1 shift and 3 shift per day:

nest on carry sid

(Motorized Pulley compared to exposed motor, gearbox, V-belt conveyor drives)

nest on return sid

Save: 1180 Kw-Hrs/Yr, 1 shift/day or 3541 Kw-Hrs/Yr, 3 shifts/day

** This parameter is for either single or dual drive arrangement.

Save: $94 /Yr, 1 shift/day or $283 /Yr, 3 shifts/day @ $0.08/Kw-Hr

Special Loading Conditions:

4.
cleats
and/or
sidewalls
showshow
dimensions
below below.
4. IfIfbelt
belthas
has
cleats
and/or
sidewalls
dimensions
5. IfIfconveyor
has
a tripper,
define
tripper
below below.
5.
conveyor
has
a tripper,
define
tripper
6. IfIf conveyor
conveyor has
define
below
6.
hasdiverter(s),
diverter(s),
define
below.

1. Hopper Feeder Design Parameters

Hopper opening width (in)
Hopper opening length (in)
Number of Hopper Openings
2. Slider Bed Design Parameters
Slider Bed Length (ft)

5. Tripper Design Parameters

Tripper length (ft)
Material lift height on tripper (ft)
No. of belt cleaners on tripper
Length of tripper skirt zone (ft)

file:///var/www/apps/conversion/tmp/scratch_1/261262117.xls, Specifier, Page 1 of 9

well maintain

maintenance
## need
Theoretical
Belt StrengthBel
(lbs

Go to Design Parameters
4. Sidewall & Cleated Belt Parameters:
Sidewall & cleat height (in)
Thickness of sidewall (in)
Distance between cleats (in)
Thickness of cleats (in)
Extra Sidewall & Cleat Wt (incl above)

1. For
Forhopper
hopper
feeder
specify
opening
dimensions
feeder
specify
opening
dimensions
below below.
2. For slider bed, specify bed length & type of bed mat'l below.
3.
3. IfIfbelt
beltisisdriven
drivenon
onreturn
returnrun,
run,specify
specifydrive
drivepulley
pulley location
location.

3. Drive Pulley Location ("return run" drive only)

Conveyor Length, tail to drive snub (ft)
Height, top of tail to bottom of drive (ft)

## Type of Dual Driv

220, 320, 400, 500

none

Type of Slider Bed Material

Slider Bed Frictional Coefficient

##
##

Belt Width=
piw =

0
0
0
0
0

Belt Strength=
###
180 degrees
180 degrees
200 degrees
210 degrees

None
0

Depth of material in skirt zone (in)

No. of non-driven pulleys on tripper
Estimated belt tension, Te (lbs)
Estimated factor, Ky

220 degrees

0
0
0
0

240 degrees

360 degrees (d

420 degrees (d

0
0
0
0.03

Bulk Density C

6. Material Diverter (Belt Plow)

No. of diverters that work simultaneously

Ashes, coal, w

Ashes, coal, we
Bagasse, 10

02/22/2015 10:59:41

Rulmeca Motorized Pulley Power Calculation Program - Standard Version 7.23

Model Selector
0
0
0
0

02/22/15
Date

0
Telephone

0
Telefax

0
e-mail

0
Project Name

6508-B Windmill Way

Wilmington, NC 28405
Ph 910-794-9294
Fax 910-794-9296
www.rulmecacorp.com

0
Conveyor Reference

Copyright - Rulmeca Corp.

320M

REQUIRED POWER:
POWER
REQUIRED

7.3 HP

BELT PULL SUMMARY:

Standard Loading Belt Pull
Extra pull for Hopper (if any)
Extra pull for Slider Bed (if any)
Extra pull for Diverter or Tripper (if any)
TOTAL Required Belt Pull (Te):
Go to Design Parameters
RECOMMENDED OPTIONS (if any):

SPECIAL NOTES (if any):

Minimum allowable belt width for lump size is 12 in
#NAME?
*A smaller pulley diameter may cause belt carcass or fastener damage.

RECOMMENDED "SINGLE DRIVE" MOTORIZED PULLEY:

Power:
Belt Speed:
Face Width:
Models Available:

7.5HP
300 FPM
37.4 in.
220, 320, 400, 500, 630

Force (lbs)
731
0
0
0
731

220M
220H

Select Model
320M

320L
320M

Check Radial Load (to prevent internal

damage to pulley)
Maximum Allowable Radial Load
Estimated Maximum Radial Load**
#NAME?

320H

Force (lbs)
4,496
#NAME?

#NAME?
500H

Check Pulley Diameter

(to prevent belt damage.)
#NAME?
Selected Diameter is 12.64 in
#NAME?

630M
630H
800M

#NAME?

Check Maximum Belt Tension

prevent belt damage)
Maximum Belt Tension (T1)
Allowable Fabric Belt Tension

(to
Force (lbs)
#NAME?
8,100

#NAME?

Belt Tension Calculation Summary

Te, effective belt tension
T2, to prevent belt/pulley slippage
#NAME?
T1, maximum belt tension

Force (lbs)
731
585
#NAME?
#NAME?

**Measured at Drive A in Dual Drive, if applicable.

Calculation for "Dual Drive on Carry Side" is under construction.

RECOMMENDED "DUAL DRIVE" MOTORIZED PULLEY:

Power:
Belt Speed:
Face Width:
Models Available:

Type of Dual Drive (if any)

5.5 HP/each
300 FPM
37.4 in.
220, 320, 400, 500

Show Location of Drive on Return Ru

Bulk Materials Belt Conveyor Drive Horsepower Calculations, Version 3.1

(based on CEMA manual, 4th Edition)

Phone

6740-E Netherlands Drive

Wilmington, NC 28405
Telephone: 910-794-9294
Telefax: 910-794-9296

Fax

Customer Name
Conveyor Number
Conveyor Length (ft.)
Tonnage Rate (tph)
Belt Speed (fpm)
Material Lift Height (ft)
Ambient temp. (deg F) Min
Ambient temp. (deg F) Max
Initial Velocity of Material (fpm)
Number of Belt Cleaners
Number of Belt Plows
Length of Skirt (ft)
Depth of Matl in skirt zone (in)
Number of Non-driven Pulleys
Belt loaded via chute.

Elevation (ft above sea level)

Type of Material
Belt Width (in)
Belt Carcass Type
Idler Roll diam (4, 5,6,or 7in)
CEMA Type (A,B,C,D,E)
Troughing Idler Spacing (ft)

100
500
300
0
-10
100
0
1
0
12
3
4
0

3300
Limestone, pulv., dry
36
Fabric
5
C
4

Required Belt Pull, Te =

731 lbs

Required Conveyor Drive HP = 7.3 HP

37.4 in.
RECOMMENDED MOTORIZED PULLEY:
7.5HP
300 FPM

ALTERNATE DUAL DRIVE OPTION:

5.5 HP/each
300 FPM

Avail. products:
Model
Diam.
0
0
TM323 12.64"
TM400 15.75"
TM501 19.72"
TM631
24.8"
0
0
Avail. products:
Model
Diam.
TM220
8.5"
TM321 12.64"
TM400 15.75"
TM501 19.72"
0
0
0
0

RECOMMENDED OPTIONS:

SPECIAL NOTES:

Engineering Design Data:

Ai
Cs
H
Kt
Kx
Ky
L
Q
Si
Tac
Tam
Tb

1.8 lbs
0.128
0 ft
1.59
0.49 lbs/ft
0.035
100 ft
500 tph
4 ft
266 lbs
43 lbs
0 lbs

Tm
Tp
Tpl
Tsb
Ttr
Tx
Tyb
Tyc
Tym
Tyr
V
Wb

0 lbs
78 lbs
0 lbs
86 lbs
0 lbs
78 lbs
71 lbs
50 lbs
194 lbs
21 lbs
300 fpm
9 lbs/ft

Calculated HP to drive conveyor belt:

6.64
Drive pulley bearing friction:
0.21
BHP (Brake HP) at motor:
6.86
Gear loss in Motorized Pulley:
0.44
Calculated HP for Drive Pulley:
7.30
Derate for high elevation:
0.00
Derate for high temp
0
Required Motorized Pulley HP:
7.30
(Note: 60 Hz Motorized Pulley motors have 1.0 Service Factor)

Tbc
Te

180 lbs
731 lbs

Wm

56 lbs/ft

Save: 1180 Kw-Hrs/Yr

Save: $94/Yr (@ $0.08/Kw-Hr)

file:///var/www/apps/conversion/tmp/scratch_1/261262117.xls, Page 3 of 9

HP
HP
HP
HP
HP
HP
HP

Power savings for 3 shift/day, 50 week/yr operation

(Motorized Pulley compared to gearmotor & V-belt drive)

02/22/2015 10:59:41

Rulmeca Motorized Pulley Power Calculation Program - Standard Version 7.23

Bulk Handling Trajectory Calculator and Plotter
(based on CEMA 5th Edition)

0
0
0
0

2/22/15
Date

0
Phone

6508-B Windmill Way

Wilmington, NC 28405
Ph 910-794-9294
Fax 910-794-9296
www.rulmecacorp.com

0
Fax

Copyright - Rulmeca Corp.

Project Name
Conveyor Ref.

Return to Specifier

0
0

System Design Parameters:

Belt Width

36 in

Troughing Idler Angle

35

Diameter Pulley (in)

13.26 in

Lagging Thickness (in)

0.31 in

Belt Speed

300 fpm

Surcharge
Angle (degrees)
Surcharge
Angle

25 deg.

Tonnage Rate (TPH)

500

Material Density (pcf)

90

Belt Thickness (in)

0.75

Distance to Chute Plate (in)

24

Angle of Conv. Inclination (deg)

Alternate Belt Speed (fpm)

350

Material Trajectory:
Small Pulley (scale: inches)

18
15
12
9
6
3
0
-3
-6
-9
-12
-15
-18
-21
-24

33

39

15

18

27

21

15

-3

-9

-15

-21

-27

Print This Sheet

Go to Large Pulley Sheet

Design Trajectory - red line; Alternate speed - blue.

Go to Overview Sheet

Calculated Results:
Calc'd mat'l height at centerline

5 in

Calc'd actual height of C.O.G.*

2 in

Calc'd actual mat'l cross section

84.7 sq ft

CEMA Max Allow. height at center

7 in

CEMA Max Height of C.O.G.*

3 in

CEMA Max Allow. cross section

Note:
This program uses actual C.O.G.* height above

9
6
3
0
-3

12

-3

-6

-9

-12

-15

-18

top of belt (based on actual cross section) to plot

152.6 sq ft

Mat'l Cross Section at Pulley Face:

Small Pulley (scale: inches)

trajectory. Height of C.O.G. for CEMA

max. allow. cross section is given for ref. only.

Design Cross Section - red line; CEMA max allow. - black line.
*C.O.G. = center of gravity of material, shown as and

file:///var/www/apps/conversion/tmp/scratch_1/261262117.xls, trajectory, Page 4 of 9

02/22/2015 10:59:42

Rulmeca Motorized Pulley Power Calculation Program - Standard Version 7.23

CEMA Rad

Material Cross Section Plotter

0
0
0
0

CEMA thet
CEMA thet
sin (CEMA
cos (CEMA

2/22/15
Date

0
Phone

6508-B Windmill Way

Wilmington, NC 28405
Ph 910-794-9294
Fax 910-794-9296
www.rulmecacorp.com

Fax

Copyright - Rulmeca Corp.

Reference Name
Conveyor Number

idler
###
###

Cross Section at Troughing Idler:

Narrow Belt (scale: inches)

System Design Parameters:

Tonnage Rate (tph)
Belt Speed (fpm)
Bulk Density (lbs/cu ft)
Material Surcharge Angle

##

Return to Specifier

0
0

500
300
90
25 degrees

Belt Width

36 in.

Idler Angle

35 degrees

###
###
###
###

15

###

12

###

Plot Wide Belt

###
###

### e
### c

Material Geometry in Troughing Idler:

CEMA Max. Allow. Cross Section

1.1 sq ft

Calculated Cross Section

0.6 sq ft

15

12

-3

6 in

-6

Calculated Edge Distance

-9

2.9 in

### n

-3

-12

58%

CEMA Standard Edge Distance

### m
### m

-15

Calc'd Xsec/CEMA Xsec

Calc'd Material Height at Centerline

d Material
e
d

Legend: Solid Line is CEMA Max. Allowable; Red Line is Calculated.

5.4 in

Trapezoida

Total Area

Material Geometry at Pulley Discharge:

Calculated Cross Section
Material Height at Centerline

4.4 in

Height of Center of Gravity (A1)

1.8 in

Assumed Edge Distance

3.02 in

Calculated Surcharge Angle

33 deg

CEMA Max. Allow height at center

CEMA Max Height of C.O.G.
CEMA Standard Edge Distance

6.6 in.
2.7 in.
1.44 in

Trapezoid

Cross Section at Pulley Face:

Narrow Belt (scale: inches)

0.6 sq ft

Trapezoid
Trapezoid
Trapezoid

Surcharge
6

Horiz Proj

2.7
1.80

0
-3

18

15

12

-3

-6

-9

-12

-15

-18

Note:
This program calculates height of actual C.O.G.*
by assuming that actual edge distance at pulley
face equals 1/2 of actual edge distance in troughed
section. Height of C.O.G.* for CEMA maximum
allowable cross section pulley face is given for
reference only.

Legend: Solid Line is CEMA Max. Allowable; Red Line is Calculated.

###
###
###
###
###

* C.O.G. = center of gravity of material

file:///var/www/apps/conversion/tmp/scratch_1/261262117.xls, Page 5 of 9

###
###
###
###
###
###
###

02/22/2015 10:59:42

Rulmeca Motorized Pulley Power Calculation Program - Standard Version 7.23

CEMA Rad

Material Cross Section Plotter

0
0
0
0

CEMA thet
CEMA thet
sin (CEMA
cos (CEMA

2/22/15
Date

0
Phone

6508-B Windmill Way

Wilmington, NC 28405
Ph 910-794-9294
Fax 910-794-9296
www.rulmecacorp.com

Fax

Copyright - Rulmeca Corp.

Reference Name
Conveyor Number

System Design Parameters:

500
300
90

Idler Angle

###
###
###
###

Cross Section at Troughing Idler:

Wide Belt (scale: inches)

42
36

25 degrees

###

30

36 in.

Belt Width

idler
###
###

Tonnage Rate (tph)

Belt Speed (fpm)
Bulk Density (lbs/cu ft)
Material Surcharge Angle

Return to Specifier

0
0

###

24

#NAME?

18
12

Plot Narrow Belt

Material Geometry in Troughing Idler:

CEMA Max. Allow. Cross Section

1.1 sq ft

Calculated Cross Section

0.6 sq ft

42

36

30

24

18

12

-6

-12

6 in

-18

Calc'd Material Height at Centerline

-24

2.9 in

Calculated Edge Distance

-30

CEMA Standard Edge Distance

-6

-36

58%

-42

Calc'd Xsec/CEMA Xsec

### R
### e
c
### o
### m
### m
### e
### n
d
e Material
d

Legend: Solid Line is CEMA Max. Allowable; Red Line is Calculated.

5.4 in

Total Area

Cross Section at Pulley Face:

Wide Belt (scale: inches)

Material Geometry at Pulley Discharge:

Calculated Cross Section

0.6 sq ft

Material Height at Centerline

4.4 in

Height of Center of Gravity (A1)

1.8 in

Assumed Edge Distance

3.02 in

Calculated Surcharge Angle

33 deg

CEMA Max. Allow height at center

CEMA Max Height of C.O.G.
CEMA Standard Edge Distance

6.6 in.
2.7 in.
1.44 in

Trapezoid
Trapezoid

18

Trapezoid

12

Surcharge

Horiz Proj

6
2.7
1.80

0
-6

Legend: Solid Line is CEMA Max. Allowable; Red Line is Calculated.

###
###
###
###
###

* C.O.G. = center of gravity of material

file:///var/www/apps/conversion/tmp/scratch_1/261262117.xls, Page 6 of 9

###
###
###
###
###
###
###
48

42

36

30

24

18

12

-6

-12

-18

-24

-30

-36

-42

-48

Note:
This program calculates height of actual C.O.G.*
by assuming that actual edge distance at pulley
face equals 1/2 of actual edge distance in troughed
section. Height of C.O.G.* for CEMA maximum
allowable cross section pulley face is given for
reference only.

Trapezoid

02/22/2015 10:59:42

Rulmeca Motorized Pulley Power Calculation Program - Standard Version 7.23

Design Parameter Summary
0
0
0
0

02/22/15
Date

0
Telephone

0
Telefax

0
e-mail

6508-B Windmill Way

Wilmington, NC 28405
Ph 910-794-9294
Fax 910-794-9296
www.rulmecacorp.com
Copyright - Rulmeca Corp.

0
Project Name

0
Conveyor Reference
Return to Specifier

Power Calculation Summary

Calculated power to drive conveyor belt:
Drive pulley bearing friction:
Power at motor:
Gear loss in motorized pulley:
Calculated power
Derate for high elevation
Derate for high temperature
Required Power for motorized pulley:

Symbol

Value

Te
ang
Cw
T2

731 lbs
180 degrees
0.8
#NAME?

T1
T1 + T2
T_L
Tatype
Beltype
w
str
pstr
btr
Ai
Cs
H
Kt
Kx

#NAME?
#NAME?
Full Lagging
Manual
2 ply, 225 piw
36 in.
8100 lbs.
16 %
3/16 to 7/16 in.
1.8 lbs
0.128
0 ft
1.59
0.49 lbs/ft

Ky
L
Q
Si
Tac
Tam
Tb
Tbc
Te
Tm
Tp

0.04
100 ft
500 tph
4 ft
266 lbs
43 lbs
0 lbs
180 lbs
731 lbs
0 lbs
78 lbs

Tpl
Tsb
Ttr
Tx
Tyb
Tyc
Tym
Tyr
V
Wb
Wm
Sag
Ls
Hd

0 lbs
86 lbs
0 lbs
78 lbs
71 lbs
50 lbs
194 lbs
21 lbs
300 fpm
9 lbs/ft
56 lbs/ft
#NAME?
0
0

6.6
0.2
6.9
0.4
7.3
0.0
0.0
7.3

HP
HP
HP
HP
HP
HP
HP
HP

Definition of Terms
Te = effective belt tension at drive.
ang = angle of belt wrap around drive pulley(s).
Cw = "wrap factor", to determine slack side tension to prevent belt slippage on drive pulley.
T2 = estimated slack-side tension required to either keep belt from slipping on pulley surface or maintain
trough at allowable sag percentage, whichever is greater.
T1 = Te + T2
T1 + T2 = Sum of belt forces on drive pulley. NOTE: This is not a vector sum.
T_L = type of lagging specified for drive pulley(s).
Tatype = type of take-up specified to apply "slack-side tension".
Beltype = type of belt carsass specified.
w = belt width
str = tensile strength of specified belt.
pstr = percentage of available belt tensile strength used.
btr = thickness range of specified belt
Ai = belt tension required to overcome frictional resistance and rotate idlers.
Cs = skirtboard friction factor.
H = vertical distance that material is lifted or lowered.
Kt = ambient temperature correction factor.
Kx = factor to calculate frictional resistance of the idlers and the sliding resistance between belt and idler
rolls.
Ky = factor to calculate resistance of belt and resistance of load to flexure as they move over idlers.
L = length of conveyor.
Q = tons per hour conveyed.
Return to Specifier
Si = troughing idler spacing.
Tac = total of the tensions from conveyor accessories.
Tam = tension required to accelerate the material continuously as it is fed onto belt.
Tb = tension required to lift or lower the belt.
Tbc = tension required to overcome belt cleaner drag.
Te = effective belt tension at drive.
Tm = tension required to lift or lower conveyed material.
Tp = tension required to overcome resistance of belt to flexure around pulleys and resistance of pulleys to
rotate on their bearings.
Tpl = tension required to overcome belt plow drag.
Tsb = tension required to overcome skirtboard drag.
Ttr = tension required to overcome special loading condition(s.)
Tx = tension required to overcome carrying and return idler friction.
Tyb = total of tensions due to resistance of belt to flexure as it rides over carrying and return idlers.
Tyc = tension due to resistance of belt to flexure as it rides over carrying idlers.
Tym = tension due to resistance of material to flexure as it rides over carrying idlers.
Tyr = tension due to resistance of belt to flexure as it rides over return idlers.
V = design belt speed.
Wb = weight of belt per unit of length of conveyor.
Return to Specifier
Wm = weight of material per unit of length of conveyor.
Sag = recommended maximum sag percentage to avoid spillage in troughed section of belt.
Ls = Length of conveyor from tail pulley to Drive snub (for return run drive only)
Hd = Height of conveyor from top of tail pulley to bottom of drive pulley (for return run drive only)

file:///var/www/apps/conversion/tmp/scratch_1/261262117.xls, Design Parameters, Page 7 of 9

02/22/2015 10:59:42

Rulmeca Motorized Pulley Power Calculation Program - Standard Version 7.23

Bulk Handling Belt Conveyor Terminology
6508-B Windmill Way
Wilmington, NC 28405
Ph 910-794-9294
Fax 910-794-9296
www.rulmecacorp.com

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Copyright - Rulmeca Corp.

Conveyor Profile

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Conveyor Cross Section in Skirt Zone

Initial Velocity of Material

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Belt Conveyor with Tripper

Hopper Feeder Conveyor

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Cleated Belt with Sidewalls

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Belt Conveyor with Two Diverter(s)

"CEMA" Idler Type Definitions

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(Based on Conveyor Equipment Manufacturers Association Manual)

Belt Width
Idler Type >
Idler (deg) >
18
24
30
36
42
48
54
60
72
84
96

A
35
300
300
280
256
-

20
300
300
300
275
-

45
300
289
270
248
-

20
410
410
410
410
390
380
-

B
35
410
410
410
410
363
353
-

45
410
410
410
396
351
342
-

Idler Load Ratings* (lbs)

C
20
35
45
20
900
900
900
900
900
900
1200
900
900
900
1200
900
837
810
1200
850
791
765
1200
800
744
720
1200
750
698
675
1200
700
650
630
1150
1050
-

D
35
1200
1200
1200
1200
1200
1116
1070
977
-

45
1200
1200
1200
1200
1200
1080
1035
945
-

20
1800
1800
1800
1800
1800
1800
1800
1800
1800
1750

E
35
1800
1800
1800
1800
1800
1800
1800
1800
1674
1628

45
1800
1800
1800
1800
1800
1800
1800
1800
1620
1575

*These ratings are for three-equal-roll idlers and are based on a 30,000 hour minimum
BU bearing life at 500 RPM. BU bearing life represents the statistical point in hours where
a minimum of 90% of the bearings will still be functional with no increase in torque or noise.

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Material Surcharge Angle Guide

(Based on Conveyor Equipment Manufacurters Association Manual)

Surcharge
Angle

Angle of
Repose

Description of Material

0 to 19

Uniform size, very small rounded particles, either very wet or very dry; such as dry silica sand,
cement, and wet concrete.

10

20 to 29

Rounded, dry polished particles, of medium weight, such as whole grain and beans.

20

30 to 34

Irregular, granular or lumpy materials of medium weight, such as anthracite coal, cottonseed
meal, and clay.

25

35 to 39

Typical common materials such as bituminous coal, stone, and most ores.

40+

Irregular, stringy, fibrous, interlocking material, such as wood chips, bagasse, and tempered
foundry sand.

30

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Rulmeca Motorized Pulley Power Calculation Program - Standard Version 7.23

Conveyor Height Calculator

Inclined conveyor length (ft)

Angle of inclination (degrees)
Material lift height (ft)

6508-B Windmill Way

Wilmington, NC 28405

0.0

Ph 910-794-9294
Fax 910-794-9296
www.rulmecacorp.com
Copyright - Rulmeca Corp.

file:///var/www/apps/conversion/tmp/scratch_1/261262117.xls, Lift Height, Page 9 of 9

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