Martin Sprocket & Gear Screw Conveyor Safety - Manual (Page 6)

CEMA STANDARD NO: 352-2012
CEMA Document: SC 2004-01
WARNING AND SAFETY REMINDERS FOR
SCREW , DRAG , AND BUCKET ELEVATOR CONVEYORS
APPROVED FOR DISTRIBUTION BY THE SCREW CONVEYOR SECTION OF THE
CONVEYOR EQUIPMENT MANUFACTURERS ASSOCIATION (CEMA)
It is the responsibility of the contractor,
installer, owner and user to install, maintain
and operate the conveyor, components and,
conveyor assemblies in such a manner as to
comply with the Occupational Safety and
Health Act and with all state and local laws
and ordinances and the American National
Standards Institute (ANSI) B20.1 Safety Code.
In order to avoid an unsafe or hazardous
condition, the assemblies or parts must be
installed and operated in accordance with the
following minimum provisions.
1. Conveyors shall not be operated unless
all covers and/or guards for the conveyor and
drive unit are in place. If the conveyor is to be
opened for inspection cleaning, maintenance
or observation, the electric power to the
motor driving the conveyor must be LOCKED
OUT in such a manner that the conveyor
cannot be restarted by anyone; however
remote from the area, until conveyor cover
or guards and drive guards have been properly
replaced.
2. If the conveyor must have an open
housing as a condition of its use and
application, the entire conveyor is then to be
guarded by a railing or fence in accordance
with ANSI standard B20.1.(Request current
edition and addenda)
3. Feed openings for shovel, front loaders
or other manual or mechanical equipment
shall be constructed in such a way that the
conveyor opening is covered by a grating. If
the nature of the material is such that a
grating cannot be used, then the exposed
section of the conveyor is to be guarded by a
railing or fence and there shall be a warning
sign posted.
4. Do not attempt any maintenance or
repairs of the conveyor until power has been
LOCKED OUT.
5. Always operate conveyor in accordance
with these instructions and those contained
on the caution labels affixed to the
equipment.
6. Do not place hands, feet, or any part of
your body, in the conveyor.
7. Never walk on conveyor covers, grating
or guards.
8. Do not use conveyor for any purpose
other than that for which it was intended.
9. Do not poke or prod material into the
conveyor with a bar or stick inserted through
the openings.
10. Keep area around conveyor drive and
control station free of debris and obstacles.
11. Eliminate all sources of stored energy
(materials or devices that could cause
conveyor components to move without power
applied) before opening the conveyor
12. Do not attempt to clear a jammed
conveyor until power has been LOCKED OUT.
13. Do not attempt field modification of
conveyor or components.
14. Conveyors are not normally
manufactured or designed to handle materials
that are hazardous to personnel. These
materials which are hazardous include those
that are explosive, flammable, toxic or
otherwise dangerous to personnel. Conveyors
may be designed to handle these materials.
Conveyors are not manufactured or designed
to comply with local, state or federal codes
for unfired pressure vessels. If hazardous
materials are to be conveyed or if the
conveyor is to be subjected to internal or
external pressure, manufacturer should be
consulted prior to any modifications.
CEMA insists that disconnecting and locking
out the power to the motor driving the unit
provides the only real protection against
injury. Secondary safety devices are available;
however, the decision as to their need and the
type required must be made by the owner-
assembler as we have no information
regarding plant wiring, plant environment,
the interlocking of the screw conveyor with
other equipment, extent of plant automation,
etc. Other devices should not be used as a
substitute for locking out the power prior to
removing guards or covers. We caution that
use of the secondary devices may cause
employees to develop a false sense of security
and fail to lock out power before removing
covers or guards. This could result in a serious
injury should the secondary device fail or
malfunction.
There are many kinds of electrical devices for
interlocking of conveyors and conveyor
systems such that if one conveyor in a system
or process is stopped other equipment
feeding it, or following it can also be
automatically stopped.
Electrical controls, machinery guards, railings,
walkways, arrangement of installation,
training of personnel, etc., are necessary
ingredients for a safe working place. It is the
responsibility of the contractor, installer,
owner and user to supplement the materials
and services furnished with these necessary
items to make the conveyor installation
comply with the law and accepted standards.
Conveyor inlet and discharge openings are
designed to connect to other equipment or
machinery so that the flow of material into
and out of the conveyor is completely
enclosed.
One or more warning labels should be visible
on conveyor housings, conveyor covers and
elevator housings. If the labels attached to the
equipment become illegible, please order
replacement warning labels from the OEM or
CEMA.
The Conveyor Equipment Manufacturers
Association (CEMA) has produced an audio-
visual presentation entitled “Safe Operation
of Screw Conveyors, Drag Conveyors, and
Bucket Elevators.” CEMA encourages
acquisition and use of this source of safety
information to supplement your safety
program.
SEE NEXT PAGE FOR SAFETY LABELS
2.