43 CFR § 3195.24
What must I do before contacting a non-Federal helium supplier for my helium needs?
June 11, 2020
You must make an initial determination about the annual helium demand for each helium use location for the expected life of the purchase order/contract. If the annual helium demand for a helium use location is a major helium requirement, it must be supplied by a Federal helium supplier.