If upstream pressure can exceed D101 design pressure, it will add a block-in contingency to safety valve sizing.

如果上游压力会超过D101的设计压力则会给安全阀的调节带来出现意外堵塞的一种情况。

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Select the valve size combinations from SIZING CHART that is within low to high flow system range.

在最低到最高流量范围内，从通径图表中选择阀门通径。

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Select the valve size from SIZING CHART that is within the range of low to high flow. (Consider requirements of lowest demand equipment.)

在最低到最高流量范围内，从通径图表中选择阀门通径。(考虑最低需要设备的要求。)

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