The problem is that it still has to be transported by trucks or rail because they haven't built any pipelines to move it.
问题是，它仍然需要通过卡车或铁路运输，因为他们没有建造任何管道来运输它。
And because it is the main ingredient in natural gas, it leaks from many older natural-gas pipelines.
而且因为甲烷是天然气的主要成分，它通过许多老式的天然气管道泄露。
Hydrates occur naturally in pipelines, and are unpopular because they clog the flow of oil.
水合物可以在输油管道中自然形成，因为它们阻碍石油的流动，因而不受欢迎。
Because Guangdong Province had canceled fees of natural gas pipelines installation, natural gas will be charged by two parts, and natural gas prices may be improved.
广东省取消管道燃气初装费，改为计量收费和容量收费的两部定价法，允许适当提高天然气价格。
Ball valve fully open, the flow resistance is very small, almost zero, so the ball valve diameter is widely used in petroleum and natural gas pipelines because the pipeline cleaning easy.
球阀在完全开启时，流阻很小，几乎等于零，因此等径球阀广泛应用于石油天然气管线中，因为容易清扫管线。
Because of the hazards made by seismic activity, at present more attention has been paid to the design of buried pipelines passing through active fault zone both at home and abroad.
由于地震活动的危害，国内外目前对穿过活动断层区埋地管道的设计均十分重视。
Welding repair onto in-service pressure pipelines has good economic efficiency and application trend, because it is much quick and has little effect to normal run of pipeline.
压力管道在役焊接修复时间短，速度快，对管道正常运行影响小，有巨大的经济效益和广阔的应用前景。
Because the financial, material and human resources are limited, can not and does not need to replace all the defects pipelines, so need to repair .
而鉴于财力、物力、人力有限，不可能也没有必要更换所有超标的缺陷管道，因此需要对缺陷处进行修复。
Space weather may also make oil and gas pipelines more prone to rusting - a particular concern because rusty pipelines sometimes spring leaks, creating costly and environmentally damaging spills.
空间天气也容易使石油天然气管道生锈—这是一个特别引人关注的问题。因为生锈的管道有时导致大量泄漏，破坏环境，代价高昂。
Specialized pipe cutting technology is required to repair damaged seabed oil and gas pipelines because common underwater cutting methods have difficulty working.
海底石油管道出现损坏时，在维修过程中需要将管道切断，采用常用的水下切割方法很难完成切割工作，文中提出了水下金刚石绳锯机切割技术。
The corrosion behaviors of carbon steel in soils are very important because it involves with safety of buried pipelines in service.
碳钢土壤腐蚀规律涉及埋地管道的安全运行，受到高度重视。
Sleeve compensator can meet the sealing requirements of any pipelines because it adopts the theory of high performance self-compaction dynamic sealing.
套筒补偿器采用高性能自压式动密封原理，能适应任何管道的密封要求。
Because the effect of the reverse fault is very complex, the study on the response of the buried pipelines due to the reverse fault is difficult and less to be carried out.
由于逆断层对埋地管线作用的复杂性，管线跨逆断层反应的研究具有一定的难度，这方面的工作开展较少。
In our country, a lot of metallic pipes were rejected because of the erosion of the pipelines annually.
在我国，每年有大量的金属管道因腐蚀而报废。
Buried pipelines are widely used in the transportation of liquid and gas media such as crude oil and natural gas. Because of severe working environment, leakage and explosion are likely to happen.
埋地管道在石油、天然气等液体和气体介质的输送中得到广泛使用，由于其所处环境和工况相对恶劣，因而具有泄漏污染甚至爆炸的潜在危险性。
The analytical results much more fit the pipeline risk situation because of the application of gray correlation analysis in the semi-quantitative risk assessment on oil and gas pipelines.
在油气管道半定量风险评价中应用关联分析法，可以使评价结果更准确。
The analytical results much more fit the pipeline risk situation because of the application of gray correlation analysis in the semi-quantitative risk assessment on oil and gas pipelines.
在油气管道半定量风险评价中应用关联分析法，可以使评价结果更准确。
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