ISA 105 is the 'name' of the committee responsible for producing the standards for
Commissioning, Loop Checks, and Factory & Site Acceptance/Integration Tests for Industrial Automation Systems.

The ISA web site has this basic info on its site at

[link Point to another website Only the registered members can access]
A link on the ISA105 page, "See all ISA105 Standards". goes to another web page with 2 standards:

ANSI/ISA-62381-2011 (IEC 62381 Modified) Automation Systems in the Process Industry - Factory Acceptance Test (FAT), Site Acceptance Test (SAT), and Site Integration Test (SIT)

ANSI/ISA-62382-2012 (IEC 62382 Modified) Automation Systems in the Process Industry - Electrical and Instrumentation Loop Check

Those are the standards you need to be looking for.