A lockout device is a mechanism or arrangement
that allows the use of key or combination locks (most
commonly padlocks) to hold a switch lever or valve
handle in the OFF position. Some switches and valves
have lockout devices built in; others must be changed
before locks can be used. As a Utilitiesman, you may
use lockout devices when working on potentially
hazardous equipment, such as high-pressure steam
lines, electrically operated equipment, and boilers. The
use of a lockout device is a great advantage since the
machine or equipment cannot be started up, energized,
or activated while you are working on it. The
photographs in figure 2-22 will give you an idea of
how devices may be used in locking out valves.
Multiple Lock Adapter
It is often an advantage for a lockout device to
accommodate more than one padlock. In this way,
when you are working on a machine or an item-of
equipment with the valve locked off, another person
can come along and use the padlock to do other
hazardous work on the machine or equipment at the
same time, rather than wait until you are finished.
Since most controls are not designed to
accommodate more than one padlock at a time,
multiple lock adapters, called lockout clamps or tongs,
may be used (fig. 2-23). These adapters should be
permanently chained to the control, or, alternately,
issued to all people with padlocks.
Figure 2-22.Locking out valves.