TB-28的目的是为公司及其员工提供液化石油气（LPG）钢瓶安全充装指南，并确保符合适用的安全和监管要求。就本技术公告而言，液化石油气包括但不限于丁烷、商用丙烷、丙烯以及这些产品的混合物。

The purpose of TB-28 is to provide companies and their employees with guidelines for the safe filling of liquefied petroleum gas (LPG) cylinders and to ensure compliance with applicable safety and regulatory requirements. For the purpose of this technical bulletin, liquefied petroleum gas includes, but is not limited to, butane, commercial propane, propylene, and mixtures of these products.