The LP-Gas Code has a provision, below, that allows for alternatives to prescribed requirements in the code. Requesting equivalency is the way to allow for the alternative.

1.5 Equivalency. Nothing in this code is intended to prevent the use of systems, methods, or devices of equivalent or superior quality, strength, fire resistance, effectiveness, durability, and safety over those prescribed by this code.
1.5.1 Technical documentation shall be submitted to the authority having jurisdiction to demonstrate equivalency.
1.5.2 The system, method, or device shall be approved for the intended purpose by the authority having jurisdiction.

To request equivalency, you must provide written technical documentation to demonstrate that the alternative does not negatively affect the characteristics listed in 1.5, above. Be specific. Calculations may be required in some cases. Definitive statements that clearly demonstrate your position and show conclusively that there is little argument against your alternative are critical. Drawings may be helpful.

All requests will be considered, but submitting the request is no guarantee that it will be approved.