ANSI B1.20.1—NPTP这个翻译成中文怎么写又是什么意思

NPT- National Pipe Taper Threads - ANSI B1.20.1

国家螺纹管标准 ANSI B1.20.1

Characteristics of NPT (also known as ANSI/ASME B1.20.1 Pipe Threads, General Purpose):

该标准规定:

tapered thread 1o 47' 锥形螺纹 1度47分
truncation of roots and crests are flat 顶部和根部的截断面是平的
60o thread angle 60度的螺纹断面角
pitch is measured in threads per inch 单位罗纹数以每英寸计算

Note! Pipe sizes do not refer to any physical dimensions. The outside diameter of a pipe or fitting must be measured and compared to a table for size identification. A 3/4" NPT pipe thread has an outside diameter - OD - of 1.050 inches.

备注：管的尺寸不是指物理容积。管的外部直径和属性必须以下面这个表格来确定。例如：一个标准为3/4" NPT的管外部直径为1.050英寸。

Each thread size has a defined number of threads per inch - TPI, or pitch. The 3/4" NPT pipe thread has 14 threads per inch. Both the TPI and OD of the thread are required for positive identification of thread size because more than one size