According to the Occupational Safety Fact Sheet - Compressed Acetylene Gas from the University of Pennsylvania:
Leak Test - Once all components are connected, perform a leak test with a soap and water solution. Test cylinder connections, regulators, torch, and hoses.

According to Safetygram 13 – Acetylene from Air Products:
Acetylene cylinders are normally fitted with brass valves that may be either hand wheel or key operated depending on local norms. Since ammonia attacks brass material, common soap solutions such as washing liquid should not be used for leak checking of acetylene cylinder valves.

They are different documents so I guess that explains why they are not on the same page.

Jack


Read the full thread at metalworkforums.com...