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Production of oil storage and transportation system in petrochemical enterprises operating conditions compared with production device, relative to "moderate". Its working pressure below 2.5 Mpa, general individual situation can be up to 4.0 Mpa; Working temperature generally under 100 OC, highest do not exceed 180 OC, only with 1.0Mpa steam purging, temperature up to 250 OC. All kinds of oil generally no corrosion or only slight corrosion. Production operations such as oil loading and unloading of oil storage and transportation, harmonic and ShuZhuan general corrosion are continuous. Production operations such as oil loading and unloading of oil storage and transportation, harmonic and ShuZhuan generally are intermittent operation, only a handful of raw materials to production device machine pump for continuous operation.Oil storage and transportation system of petrochemical enterprises pipes material are in accordance with the industry standard for the petroleum chemical industry pipeline design equipment selection in general (SH3059-94). The specification for resistance welding of carbon steel in the selection of straight seam steel pipe (ERW steel pipe) regulation: the cold expansion dilation rate of no more than 1.5% diameter products, appropriate is used to design temperature does not exceed 200 OC, without the cold expansion of steel tube can be used to design temperature does not exceed 425 OC. Thus it can be seen that can choose ERW steel pipe in the oil storage and transportation system. But in actual design work, design units have more concrete pipe selection rules and the practice of some habits.Within and eighties, due to historical limitations, there is no ERW steel pipe, only can be used for low pressure fluid (water, compressed air, etc.) of high frequency electric resistance welding steel pipe, namely according to national standard "low pressure fluid conveying with galvanized welded steel pipe (GB3091) and the low pressure fluid conveying in welded steel pipe (GB3092) production of welded steel pipe. By industry standard and the pressurized fluid conveying with spiral seam submerged arc welding steel pipe "(SY5036) and the pressurized fluid conveying with high frequency welded pipe, spiral seam (SY5038) production of spiral weld pipe. This kind of steel pipe generally can only be used in the design pressure of not more than 1.0 Mpa non-toxic medium pipeline. So generally in oil storage and transportation system design, regardless of the actual production operation condition, can only use seamless steel tube. Long concrete pipes material in various units, choose seamless steel tubes are stipulated in the general case, only when a DN 350 or more, can choose spiral seam submerged arc welding steel pipe (the main reason is the large diameter seamless steel pipe to import at that time, expensive). Sometimes in order to agree with production equipment selection, in oil storage and transportation system also requires the selection with seamless steel tube.Since the 90 s the country successively introduced from abroad the ERW steel pipe production technology and equipment, can produce DN80-300 has been the ERW steel tube, the annual output can reach millions of tons. According to API, ASTM, GB/T standard production. Although these straight seam steel pipe prices are much lower than those of seamless steel tube to, also can adapt many production in petrochemical enterprises, but these products for a variety of reasons in petrochina and sinopec is widely used in the system.For long-distance pipeline construction, the choice of the ways of steel tubes and pipe is extremely important, not only does it affect the quality of pipeline engineering construction technology and construction, will also affect the safety of pipeline operation and management in the future, more will be a huge impact on the whole project investment (in the long pipeline of the project investment, tubing investment generally accounted for 50% - 65%).