压缩气体行业认识到，美国交通部（DOT）/加拿大交通部（TC）用于盛装非液化气体的气瓶的填充过程受到影响固定压力的变化和监管要求的影响。该行业遵循DOT和TC规定的压缩气体填充要求。根据49 CFR 173.301a（c）中的DOT规定或《危险货物运输条例》中的加拿大规定以及CSA B340第5节“运输容器的选择和填充”，行业惯例是填充压缩气瓶，以达到规定的固定压力，该压力不超过基准温度下的授权工作压力。 CGA P-77描述了非液化气体填充气瓶期间可能发生的变化。本出版物包含将这些变化对沉降压力的影响降至最低的方法。此外，它还确定了填料可以合理预期的规定沉降压力的可变性。

The compressed gas industry recognizes that the filling process for U.S. Department of Transportation (DOT)/Transport Canada (TC) cylinders used to contain nonliquefied gases is subject to variations and regulatory requirements that affect the settled pressure. The industry follows DOT and TC regulations that specify filling requirements for compressed gases. Industry practice is to fill compressed gas cylinders to achieve a specified settled pressure that does not exceed the authorized service pressure at reference temperature in accordance with DOT regulations found in 49 CFR 173.301a(c) or Canadian regulations found in Transportation of Dangerous Goods Regulations and CSA B340, Section 5, “Selection and filling of containers for transportation”. This publication describes the variations that can occur during the filling of cylinders with nonliquefied gases. This publication contains methods to minimize the effect of these variations on the settled pressure. In addition, it identifies the variability in the specified settled pressure that fillers can reasonably expect.