Section 21 of the Factories Act states that the guards shall be constantly maintained and kept in position. Such maintenance is obviously necessary because of a machine running without guards or open or broken guards pose danger. Regular inspection of guards can detect the guard removed, damage requiring repairs. A guard removed for repair should be fitted at the earliest possible and meanwhile, the temporary guard should be installed or the machine is stopped. Good maintenance increases the lifeguards and vice versa. The supervisor should constant attention to this. A guard should be so designed or fitted or that it is not to be opened for oiling/greasing or nearby maintenance work. The parts needing regular service should be located outside the guard. If oil/grease fitting is inside the guard, an extension through I guard should be provided. Automatic controls for lubrication, adjustment service can be provided by a sophisticated equipment Interlock type guard ensure that the machine can be operated unless all guards are in position. Such planning helps maintenance without disturbing guards.
When a guard cannot be made to exclude Lint fume, dusting, etc., extra ventilation should be Provide large guards should have self-closing doors cleaning. Space should be provided in surrounding repair and maintenance. Some people use red color for guards to show dangerous part while some pre the same color that of the machine to consider it an integral part of the machine.
WORK ON MACHINERY IN MOTION FOR MAINTENANCE PURPOSE
During maintenance of the machine, normally guard is removed and observation for fault, alignment repairing or oiling/greasing is carried out unguarded condition. Such a condition may kill or fault alignment untrained or unknowing person. ‘
‘Work on or near machinery in motion’ statutory requirement u/s 22 of the Factories Act.
As far as possible this state (condition) shot is observed is all energy sources must be de-energized or made least effective before any maintenance is to be started. After switching off electrical power rotating machinery may continue to rotate due moment of inertia. This may cause an accident. rotating part should come to rest in stop conditions Therefore the mechanical steady-state condition (ZMS) should be maintained before starting any maintenance work. This is the safest condition.
Lockout and Tag-out
This system is used at the time of maintenance or repair work on the machine. The power source to the machine is cut off or it is mechanically locked it called lockout. A tag is tied with necessary instruction that this machine is under repair or maintenance and it should not be started. This is called the tag-out.