There is no Federal OSHA requirement specifically addressing the use of compressed air to test for leaks in gas lines, according to an OSHA letter of interpretation sent in response to a compliance inquiry. Then- Director of the Office of Construction and Compliance Assistance Gerald P. Reidy noted that there are several applicable general industry and construction standards addressing the hazards of compressed gases.
In the construction standard, Subpart J, Welding and cutting, §1926.350.(c)(2) and (3) require that: