What is not required from an applicant before certain LP-Gas installations?

The correct answer pertains to the specific requirements that are necessary prior to certain LP-Gas installations. In the context of the RRC Texas LP-Gas regulations, the submission of LPG Form 500 is not mandated from an applicant before these installations. This form is used in particular scenarios but is not a universal requirement for all types of installation processes.

Conversely, the other items listed are essential components of the application process for LP-Gas installations. Documentation for maintenance is vital to demonstrate that the system can be properly maintained and comply with safety standards. Applications for safety permits are necessary to ensure that the installation meets regulatory safety requirements and can be safely utilized. Additionally, a site plan for new installations is critical for assessing the area where the LP-Gas will be utilized, ensuring that it adheres to safety and zoning laws. Thus, it becomes clear why the submission of LPG Form 500 stands out as not being a generally required step prior to certain installations.