A&A Inspection
USA, nondestructive testing

AAA Technology
USA, pipe engineering / vessel engineering software, pipe supports (including spring hangers), and piping design

Acoustic Systems Inc.
USA, Acoustic Leak Detection

Alpha Leak Detection Inc.
USA; locating small leaks on buried pipelines; leak detection, pipeline rehabilitation consultation, electronic buried line location, pig tracking

Alyeska Pipeline Service Company
USA, designing, constructing, operating, and maintaining the Trans-Alaska Pipeline System

Alyeska Pipeline Service Company
USA, crude oil pipeline service

Ameron International Corporation
USA; coatings, fiberglass pipe; steel pipe

AnchorPipe International Inc.
USA, pipeline stabilization