Safetygram-安全程序-.docVIP

Safetygram-30安全程序-30 Handling Liquefied Compressed Gas 液化压缩气体的操作 General概述 A liquefied compressed gas can be defined as a gas, which when compressed in a container, becomes a liquid at ordinary temperatures and at pressures ranging from 25 to 2500 psig. Liquefied gases have boiling points that range from –130 to 30°F (–90 to –1°C). At 70°F the cylinder contains both liquid and gas. Cylinder pressure, or the “vapor pressure” of the gas, is directly affected by ambient temperature. Increases or decreases in the temperature will cause the vapor pressure to increase or decrease, respectively. 液化压缩气体可以定义为这样一种气体，当压缩在一个容器里时，在常温下它变成了液体，压力范围从25到2500 psig。液化气体的沸点在–130到30°F (–90到 –1°C)范围内。在70°F时，钢瓶内既有液体又有气体。钢瓶压力，或气体的“蒸气压”直接受到周围环境温度的影响。温度的增加或减少会导致蒸气压分别增加或减少。 Liquefied gases are packaged under their own vapor pressure and are shipped under rules that limit the maximum amount that can be put into a container to allow for liquid expansion with rising temperatures. The U. S. Department of Transportation (DOT) states in 49CFR 173.304 that the liquid portion of a liquefied gas must not completely fill the packaging at any temperature up to and including 130°F. The DOT sets the fill density for liquefied compressed gases to aid compliance to this requirement. Fill density is defined as the percent ratio of the weight of liquefied gas in a container to the weight of water that the container will hold at 60°F (1 pound of water =27.737 cubic inches at 60°F or 62.3 pounds of water per cubic foot of container volume). 液化气体包裹在它们自己的蒸气压下。按照规定，要限制装入容器的液化气体的最大数量，为温度上升时的液体膨胀留下余地。美国交通部(DOT)在49CFR 173.304中规定，在任何大于并包括130°F的温度时，液化气体的液体部分不能完全充满容器。DOT规定了液化压缩气体的灌装密度，以帮助执行这个要求。灌装密度定义为，容器中液化气体的重量对60°F时该容器能容纳的水的重量的百分比率（在60°F时，1磅水=27.737立方英寸，或者说每立方英尺容器容积等于62.3磅水）。 Typical liquefied compressed gases are listed in Table 1. 典型的液化压缩气体???于表1。 Containers容器 Liquefied compressed gases come in a variety of containers. 液化压缩气体可以装在多种容器里。 Because the product exists in both the liquid and gas phases in the container, m