this method is most suitable for long-distance viscous crude transportation. screw pumps can be used to transport a wide variety of liquids with a wide viscosity range.

螺桿泵运送液体的种类和黏度范围宽广，具有结构简单、维修方便、体积小、流量稳定、压力高、耐高温等优点。

screw pumps are classified as two different types: the single rotor and the multiple rotor.

螺旋泵被列为两种不同的类型：单转子和多转子。

the regularity can be applied to optimize the design of screw pumps and improve its working efficiency.

利用此规律可对螺桿泵进行优化设计，提高其工作效率。

in view of the actual condition in daqing oiffield, the detecting standard for modelglb120 - 27, glb40 - 42 and glb500- 14 screw pumps is formulated on the basis of many indoors and field tests.

针对大庆油田的实际情况，在进行大量室内和现场试验的基础上，制定了glb120-27、glb40-42和glb500-14型螺桿泵的检测标準。

the currently-used single screw pumps have the shortcomings of low rotary speed, severe vibration and large centrifugal force, therefore a novel twin-rotation single screw pump is developed.

针对目前单螺桿泵使用中存在的转速低、振动大和离心力大等局限性，研制了一种实用的新型双转动单螺桿泵。

these new screw pumps were developed in collaboration with leading burner manufacturers to specifically target requirements in the market.

这些新开发了螺桿泵与领先的刻录机厂商的合作，专门针对市场需求。

taking some sewage treatment plants project as an example, carrying on the electrical design and the programming to screw pumps control in sewage pump station.

以某污水处理厂的工程为例，对污水泵站的螺旋泵的控制进行电气设计和程序编制。

based on these rules, we can check the conformability of existing screw pumps to their sealing requirements or design new screw pumps with improved teeth profiles.

此设计规律可用来检验现有螺桿泵是否符合密封性要求，还可用来设计新齿形螺桿泵。

after making analysis of the structure of the rotors of screw pumps 1.2rpeo29po for unclear power station, a new workmanship of swirl peeling method was proposed for machining the long rotor.

通过分析、研究1.2rpeo2 9po核电站用单螺桿泵转子的结构特点，提出了旋风切削加工单螺桿泵细长转子的工艺方法。

screw pumps can be effectively used for oil withdrawal on viscous oil wells, sand wells, low production wells and those late in water-drive course.

螺桿泵能用于游梁式机泵和电潜果无法拍采的稠油并、含砂油并和低产油井及中后期水驱油田的采油作业。

screw pumps can be used to highly viscous liquid. viscous dissipation cannot be neglected during such pumping because it causes the temperature of liquid to rise and its viscosity to decrease.

螺旋泵可用来输送高粘性液体，该过程中由于液体的温度升高而粘度降低，因而其粘性耗散不能忽略。

to ensure the hydraulic control valve in the discharge screw pumps as soon as possible when driving condensate, rapidly increase the temperature of heating equipment.

才能保证水力控制阀在开车时能尽快排出凝结水，迅速提高加热设备的温度。

note: different rubber for screw pumps using different media.

注意，螺桿泵所使用的介质不同应采用不同的橡胶。

the surface drive unit of screw pumps features in complex stress and many vibration sources, so the traditional vibration test method cannot determine the diagnosis accurately.

螺桿泵地面驱动装置受力复杂，振源众多，常规的振动测试对于故障的定位与诊断精确度不高。

it is necessary for users to provide required data and information required by the 「data & information needed for selecting pumps」 when three screw pumps are selected.

三螺桿泵选型时，用户提供下面《选型数据表》中的具体数据和相应的要求信息是非常必要的。这关系到泵的经济、正确的选型。