33
USER MANUAL
▪
Red Rooster Lifting Limited
▪
Nauta House, The Meadows, Oldmeldrum, Aberdeenshire, AB51 0EZ
▪
Tel: +44 (0) 1651 872101
▪
M01-AH28 REV2
DUTY RATINGS
10.1
FEM 9.511 classifies the theoretical loading conditions and operating time in hours per day.
FEM 9.755 classifies the theoretical duration of service for safe operation.
APPLICATION OF FEM RULES TO PNEUMATIC HOISTS
With most mechanical equipment, the limiting factor with regard to operating time is that of HEAT GENERATION.
For example, an electric motor if not periodically allowed a ‘rest period’ to allow it to cool down after each period of use will cease to function due
to irreversible damage arising as a consequence of the heat.
Air motors perform differently. Although heat is generated, providing that the motor is properly lubricated, no damage will ensue. The expanding
air at the outlet manifold also has a cooling effect on the motor.
As a result pneumatic motors are commonly referred to as 100% duty rated or continuous rated, which means simply that they may be used
continuously without a cooling down period and without damage arising as a consequence.
Incorporated into the TMH hoist are three classes of components:
1.
Sacrificial components - These components are designed to incur wear to either protect other components or to function by
means of friction generation. They require periodic inspection and replacement and comprise of the rotor vanes and the brake disc.
Inadequate lubrication seriously reduces the life expectancy of the vanes.
2.
Load chain - Whilst adequate lubrication of the load chain will reduce friction and thereby limit the wear occurring between the
bearing points of adjacent links, it will not totally eliminate it. Hence it will require regular inspection and will also require replacement
within the service life of the hoist.
3.
Structural and mechanical components - These comprise all other parts of the hoist, including gearbox and bearings, rotor and
housing, valve, hooks, pins etc. A theoretical service life for every component has been calculated (available on request). For the
purposes of the summary, the SHORTEST service life of any component has been included.
10.2
TABLES OF DUTIES - TMH-37.5T & TMH-50T/4 Hoist
*Shortest duration stated.
IMPORTANT NOTES
A hoist is deemed to be operating when it is in motion.
All ratings are based on a clean, dry, air supply and correct lubrication.
Load chain must be to manufacturer’s specification.
Special chains are excluded (consult your supplier).
Mode of use must be in accordance with manufacturer’s recommendation.
FEM standard
For all mentioned TMH models
FEM 9.511
1Bm (M3)
Theoretical duration of service
FEM 9.755
Sacrificial components
Load chain
Structural & mechanical components*
1Bm (M3)
1Bm (M3)
1Bm (M3)
