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TABLE 1.6  Considerations during Each Mode of Usage*

Life expectancy

Duration of length of use

Complexity

Operator position/station

Nonoperator position/station

Labeling

Misuse

Material used

Operator education/skill

Operator mental/physical

condition Environment or surrounding

condition

TABLE 1.7   Specific Design Concepts and Philosophies

K.I.S.S.f

Fail safe

Design hazards out

Positive lockouts

Warnings

Emergency shutoffs

Prevention of inadvertent

actuation Prevention of unauthorized

actuation

Shielding and guarding Proper materials for

operation Accessibility for

adjustments/service

Foreign material sensing/

elimination

Prevention of modification Isolation of operators from

point of machine

operation

Controls user-friendly Provide proper safety

equipment Provide overload/overspeed

alarms

Training programs High feasible factor of

safety

Redundant systems Proper use of components

Deadman switches Shield and guard interlocks Avoid the use of set screws

and friction locking

devices Use self-closing lids/hatches/

closures Consider two-handed

operation for each

operator Use load readouts when

possible Control failure mode so

consequences are

predictable