Chapter 2. Safety
PELLERIN MILNOR CORPORATION
DANGER 21 : Biological Hazards—Even if thoroughly purged, flushed, cooled, and
drained, modules may contain disease organisms carried in with the goods.
• Never enter the tunnel with open wounds.
• Beware of sharp objects carried in with the goods.
DANGER 22 : Electrocution Hazard—Use only air or battery powered tools and lights.
• Never attempt to illuminate the tunnel by carrying in any non-battery powered electrical
devices.
• Never carry in plug-in tools.
DANGER 23 : Crush Hazard—Unless electrically disabled and mechanically restrained,
tunnel cylinder can rotate without warning, entrapping and even crushing you.
• Lock main fusible disconnect and Mentor
™
fusible disconnect in OFF position.
• Use wood or metal restraints held by C-clamps to block chain drives on both sides of the
small sprocket, so an off-center weight distribution in the cylinder will not cause it to drift
or turn by itself in either direction. See Figure 3.
DANGER 24 : Other Unknown Hazards—There may be additional hazards, perhaps (but
not necessarily) peculiar to a particular installation, that are unknown as of this writing. It is
solely the responsibility of the owner/user to recognize and cope with any such hazards.
2.2.2.2. What to Do Before Entering the Tunnel
1. Disable all hot water and chemical feeds to the tunnel.
2. Provide natural light and ventilation to each module. Remove any vent covers or vent
piping, etc. on the top of each module to provide natural light and ventilation inside each
module. Open all weir box covers. These measures will provide ventilation and
communication benefits and a means to monitor any odors in each module. See Item 7 below.
3. Drain, purge, flush, and cool the tunnel.
a. First drain each module completely, including both sides of each drain trough in each
module. A pipe plug in the bottom of each drain trough is provided for this purpose when
the module has no drain valves (or only one drain valve). If the tunnel has been in service
a long time, the pipe plug drains may be blocked with sediment. If water does not come
out, use a screwdriver or small rod to penetrate the blockage.
Drain any overhead tanks that can feed the tunnel.
b. Reinstall the pipe plugs (hand tight), and close the module drain valves.
c. Flush the tunnel with cold water, ensuring every module is sufficiently flushed. (If
necessary, use water hoses directed into each weir box to accomplish this.) The tunnel
and its contents must be totally flushed and cooled. All chemicals in the water and goods
must be completely removed before anyone can be allowed to enter the tunnel.
(Permitting the tunnel to turn normally—without transferring—should expedite this
process without worsening the jam; but the tunnel must not transfer.) Place the
TUNNEL RUN-HOLD switch on the controller at HOLD to command the tunnel not to
transfer. Now start the tunnel in the normal way and observe that it reverses normally.
Stop the tunnel at once if it turns only in one direction!
d. Once the goods are cold and all chemicals have been purged from every module, again
drain both sides of each drain trough in each module per Item 3.a above. Ensure each
module is fully drained and totally empty of all water before entering the tunnel. No
water must remain standing in any module. If any drain valve or module overflow is
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