A

Atmosphere, Explosive

AFCI

Arc-fault circuit interrupter

Apparatus, Intrinsically Safe

Aluminum, Copper-free (or low copper content)

Adjustable Speed Drive

ASD

As-purchased Length

Auxiliary Piping

Authorized Piping Inspector

Applicable Code

Alloy Material

Abandoned-in-place

Annular Friction Management

Axial load-free testing

AR (acid resistant) glass

Anisotropic

Adhesive Joint

Adhesive Bond

Active Fire Protection

Accelerator

Authority Having Jurisdiction

ASOG

Activity-Specific Operating Guidelines (ASOG)

AD

ACL

AAA

Asset Owner

Asset Characterization

Asset Attractiveness