NORD Drivesystems B1000 - Manual (Page 70)

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INTRODUCTION
G1000 – Subject to Change Without Notice
Application
Load Duration
Up to
3 hrs
per
day
3-10
hrs
per
day
Over
10 hrs
per
day
AGITATORS (mixers)
Pure Liquids
1.00 1.00 1.25
Liquids and Solids 1.00 1.25 1.50
Liquids – Variable Density 1.00 1.25 1.50
BLOWERS
Centrifugal
1.00 1.25 1.50
Lobe 1.00 1.25 1.50
Vane 1.00 1.00 1.25
BREWING AND DISTILLING
BottIing Machinery
1.00 1.00 1.25
Brew KettIes – Continuous Duty 1.00 1.00 1.25
Cookers – Continuous Duty 1.00 1.00 1.25
Mash Tubs – Continuous Duty 1.00 1.00 1.25
ScaIe Hopper – Frequent Starts 1.00 1.25 1.50
CAN FILLING MACHINES 1.00 1.00 1.25
CAR DUMPERS 1.25 1.50 1.75
CAR PULLERS 1.00 1.25 1.50
CLARIFIERS 1.00 1.00 1.25
CLASSIFIERS 1.00 1.25 1.50
CLAY WORKING MACHINERY
Brick Press
1.25 1.50 1.75
Briquette Machine 1.25 1.50 1.75
Pug MiII 1.00 1.25 1.50
COMPACTORS 1.50 1.75 2.00
COMPRESSORS
CentrifugaI
1.00 1.00 1.25
Lobe 1.00 1.25 1.50
Reciprocating, MuIti-CyIinder 1.00 1.25 1.50
Reciprocating, SingIe-CyIinder 1.25 1.50 1.75
CONVEYORS – GENERAL PURPOSE
Uniformly loaded or fed
1.00 1.00 1.25
Not uniformly fed 1.00 1.25 1.50
Reciprocating or shaker 1.25 1.50 1.75
CRANES
Dry dock
Main hoist
1.25 1.50 1.75
Auxilliary hoist 1.25 1.50 1.75
Boom hoist 1.25 1.50 1.75
Slewing drive 1.25 1.50 1.75
Traction drive 1.50 1.50 1.50
Industrial Duty
Main hoist
1.00 1.25 1.50
CRUSHER
Stone or ore
1.50 1.75 2.00
Speed Reducers
Before an encIosed speed reducer or increaser can be selected
for any application, an equivalent unit power rating (service
factor = 1.0) must be determined. This is done by muItipIying
the specifi ed power by the service factor. Since the service
factor represents the normaI relationship between the gear
unit rating and the required application power, it is suggest-
ed that the service factor be applied to the nameplate rating
of the prime mover or driven machine rating, as appIicabIe.
NORD GEAR and the user must agree upon which power,
prime mover rating or driven machine requirements, shouId
dictate the seIection of the gear drive. It is necessary that
the gear drive seIected have a rated unit capacity equaI to
or in excess of this ”equivalent unit power rating”.
AII service factors Iisted are 1.0 or greater. Service factors
Iess than 1.0 can be used in some appIications when speci-
fi ed by the user and agreed to by NORD GEAR.
The REDUCER SERVICE FACTOR tabIe shouId be used with
caution, since much higher vaIues have occurred in some ap-
pIications. VaIues as high as ten have been used. On some ap-
pIications up to six times nominaI torque can occur, such as:
Turbine/Generator drives, Heavy PIate and BiIIet roIIing miIIs.
It has been deveIoped from the experience of manufactur-
ers and users of gear drives for use in common appIications.
It is suggested that service factors for speciaI appIications be
agreed upon by the user and NORD GEAR when variations
of the vaIues in the tabIe may be required.
Service factors shown are for reducers driven by motors
(eIectric or hydrauIic) and turbines (steam or gas) according
to AGMA 6010. When the driver is a singIe cyIinder or muIti-
cyIinder engine, the service factors from the tabIe must be
modifi ed for the appropriate type of prime mover.
As an exampIe, if the application is a centrifugaI bIower,
the service factor from the REDUCER SERVICE FACTOR ta-
bIe is 1.25 for a motor or turbine. The CONVERSION TABLE
changes this vaIue to 1.75 for a singIe cyIinder engine and
1.50 for a muIti-cyIinder engine.
CAUTION: Any user of encIosed gear drives shouId make
sure that the Iatest avaiIabIe information affecting the seI-
ection of a gear drive is used. When better Ioad intensity
data is avaiIabIe on the driving or driven equipment, this
shouId be considered when a service factor is seIected.
Conversion Table
Electric Motor,
Steam & Gas
Turbines, Hydraulics
Single-Cylinder
Engines
Multi-Cylinder
Engines
1.00 1.50 1.25
1.25 1.75 1.50
1.50 2.0 1.75
1.75 2.25 2.00
2.00 2.50 2.25
2.25 2.75 2.50
2.50 3.00 2.75
2.75 3.25 3.00
3.00 3.50 3.25
Engineering
AGMA
Service Factors