The American Petroleum Institute (API) provides standards for pipe suitable for use in both the oil and natural gas industries (figure 4).
美国石油协会对适合应用于石油和天然气行业的管材制定了标准(如图4)。
Introduce welded seam specification, standards performed, inspectation items and acceptable index for welding of body and joint pipe.
介绍了阀体与接管焊接的焊缝技术要求、执行标准、检验内容及合格指标。
This is no unfunded pipe-dream. The city is already required to spend $6.8 billion over 20 years to meet harbour-quality standards.
这并不是纽约在做一场不用花钱的白日梦，在过去的20年里该城市已经花费了68亿美元使处理过的污水达到港口质量标准。
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