Chapter 2. Safety
PELLERIN MILNOR CORPORATION
2.2.1.3. Correct Cylinder Rotation—Although unlikely, it is conceivable that one or more of the
four rotation-control proximity switches might malfunction, or the proximity switch or its target
might become maladjusted causing a jam. However, the Mentor
™
controller is programmed to
recognize an error if any of the four proximity switches is not seen, or seen in an incorrect order,
or if the time to transit from each switch to the next varies from the standards commanded in
output timers Top Dead Center to Safety, Counter-clockwise to Top Dead Center, and Clockwise
to Counter-clockwise in the Mentor
™
software. Moreover, a separate, non-computer,
electromagnetic “watch dog timer” in the controller will stop the tunnel if the machine rotates too
long in the transfer direction. (Jams usually do not occur if the tunnel rotates continuously in the
non-transfer direction.)
2.2.2. Clearing Tunnel Jams Safely and Efficiently
2.2.2.1. Guidelines for Management
1. A tunnel jam, no matter how minor, incapacitates the tunnel and requires entering the
machine to service it.
2. A competent supervisor must be present outside of the tunnel at all times. The supervisor
must use these methods to track the status and location of each worker and the progress of the
jam-clearing operation:
a. Establish a distress signal, such as banging five times (international danger signal) on the
cylinder wall, to be used by any worker who runs into trouble.
b. Frequently talk through the module vent on top of each module to each worker inside the
tunnel.
DANGER 16 : Prepare thoroughly—Do not enter the tunnel until all safety hazards are
eliminated. Supervisor must be present outside the tunnel at all times. Potential safety hazards
include, but are not necessarily limited to the the conditions stated in the following safety
statements.
DANGER 17 : Panic and Isolation Hazards—Confined space, dampness, heat, odor,
darkness, etc. can induce panic. Workers cannot be readily evacuated.
• Take measures to minimize adverse working conditions.
• Permit only smaller, agile, completely healthy, non-claustrophobic workers to enter the
tunnel.
DANGER 18 : Chemical Burn Hazards—If not thoroughly purged, flushed, cooled, and
drained, modules may contain toxic substances that can burn your skin or eyes.
• Before permitting anyone to enter, thoroughly purge, flush, cool, and drain the tunnel as
explained in this document.
DANGER 19 : Poison and Suffocation Hazards—If not thoroughly purged, flushed,
cooled, and drained, modules may contain toxic gases that can kill or injure you if inhaled.
• Test for and purge gases.
• Ventilate tunnel continuously.
DANGER 20 : Burn and Heat Prostration Hazards—If modules are not thoroughly
purged, flushed, cooled, and drained, cylinder surfaces, goods, and bath may be hot enough to
burn you on contact. You can become ill while working in a hot tunnel.
• Do not enter the tunnel unless all goods and surfaces are cool.
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