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)。
The American Petroleum Institute (API) provides standards for pipe suitable for use in both the oil and natural gas industries (figure 4).
几十年来，美国国家标准学会设计的ANSI法兰已经为石油和天然气工业提供了壹种适用的密封技术，而且卓有成效。
For decades, American national standards institute ANSI flange design has been for the oil and gas industry is provided one of the sealing technology, and effectiveness.
几十年来，美国国家标准学会设计的ANSI法兰已经为石油和天然气工业提供了一种适用的密封技术，而且卓有成效。
For decades, the American National Standards Institute ANSI flange design for the oil and gas industry provides a seal applied technology, and effective.
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