Charpy impact specimens shall be taken from each test unit or from 100 lengths of heat pro- duced, whichever results in a greater number of impact tests. 这句话里面有个lengths, 还有下面表格里面的lengths,在这种情况下都是什么意思呢?
Pipe Size Grade Pipe Body Tensile Test
5.562 in. (141 mm) all 400 lengths per test unit
5.562 in. and < 8.625 in. all 200 lengths per test unit
(141 mm. and < 219 mm).