The standard covers dimensions and gaging of plastic tapered National Pipe Threads (NPT) for leak-tight joints, and it is now referenced in all ASTM Standards for plastic piping products.
In this article, the materials of bolts and nuts and the standard for the materials normally used in pressure vessels and piping were analyzed.
本文仅就过程工业中压力容器及压力管道常用的紧固件材料标准及牌号进行分析。
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By analyzing three fire - fighting circuit piping system, and comparing some standard, it can get advantages and disadvantages, and introduce the design of fire-fighting pump piping system.