Interchangeability

This is an important maintainability design factor that is made possible through standardization. Interchangeability is defined as an intentional aspect of design, any component, part, or unit can be replaced within a given product or piece of equipment, by any similar component, part, or unit.

There are two types of interchangeability:

• Functional interchangeability, and
• Physical interchangeability.

In functional interchangeability, two specified items are interchangeable as they serve the same function. In physical interchangeability, two items can be mounted, connected, and used effectively in the same locations and in the same manner.

Requirements of Interchangeability

Interchangeability requirements are:

• Field use conditions or functionality.
• The economy of design and manufacture, and
• Inspection and checking parameters,

Principles of Interchangeability

Basic interchangeability principles are:

• Liberal tolerances.
• Uniformity.
• Dimensional similarity.
• In equipment, products, or units that require frequent replacement and servicing of component parts due to wear or damage, each and every part must be totally interchangeable with each and every other like part.