The paper introduces the approximate formula for the head curve of pump, the pipe resistance curve of system and the efficiency of pump with relative value.
介绍了扬程特性、管阻特性和水泵效率的相对值近似表达式。
Basically, those steel pipe materials which, with adequately high strength, show sufficient toughness, good welding behaviour and resistance to corrosive media are in demand.
基本上，这些需求的钢管材料，都具有足够大的强度，韧性，良好的焊接能力以及耐腐蚀介质。
Pipe friction is the resistance to flow caused by the pipe. As a general principle, it is better to use the largest practical pipe size to avoid losses in pump performance.
管道摩擦力是指由管道引起的流动阻力，作为一个常用原则，最好是使用最大的实用的管道尺寸以避免在水泵性能方面的损失。
The respective resistance properties for branch pipe were investigated through experiments and GRNN neural network when both conveying velocity and the flow valve opening of branch pipe were changed.
通过试验和GRNN神经网络对输送表观气速和两分支管路流量控制阀开度发生变化时，各分支管路中的阻力特性进行了研究。
The paper investigated the flow distribution of solid phase and the respective resistance properties of branch pipes when both conveying velocity and the flow valve opening of branch pipe are changed.
通过试验，当输送气速和分支管路流量控制阀开度变化时，对分支管路各自的阻力特性和固相颗粒在各分支管路中的流量分配特性进行了研究。
Outer frame is used advanced digital controled creased bend pipe reduction board machine impacting processing industry galvanized board strong causticity resistance.
外框采用先进的数控折弯机、数控减板机以及数控冲床加工工业，特厚镀锌板，抗腐蚀性极强。
Under this situation, we must reduce the speed of pump, increase the power of the motor, increase the import and export of pipe diameter to reduce the flow resistance of the medium.
在这种状况下，必须降低泵的转速，加大电机的功率，加大进出口的管径来减少介质的流动阻力。
The structure parameters and resistance characteristics of spiral pipe flow generator which generates spiral flow in circle pipe were analyzed and investigated.
对用于产生螺旋管流的圆管螺旋流起旋器的结构参数进行了分析，并对其阻力特性进行了理论分析和试验研究。
A new pile-driven technology named air curtain dry soil withdrawal can reduce resistance of a sinking pipe by withdrawing soil from the pipe and installing air curtain on the outside of pipe.
空气幕、套管内干取土沉管灌注桩这种新的施工工艺是通过套管内取土，套管外设空气幕来减少沉管阻力。
Emphasizes that the resistance of the pipe system and the air infiltration rate under smoke exhausting are far more than those under ventilation, so as to need a careful calculation.
强调排烟工况下管网总阻力、漏风量均远大于通风空调工况，必须严格认真地计算。
A pipe hydraulic resistance coefficient model for natural gas pipeline network is established based on positive and negative analytic approach.
采用正反分析法建立了天然气管网管段阻抗系数优化反演的数学模型。
More injection flow rate, slim branch injection pipe and long pipeline resulted in more resistance at the branch injection pipe.
由于注水量较高、注水支线管径较细、管线较长等原因，导致注水支线阻力偏大；
Analysis the causes and results of the phenomenon that calculating of frictional resistance in industrial pipe-line design is not accurate enough.
分析了目前工业管道设计中存在沿程阻力计算不够准确这一现象的原因及由此产生的后果。
On the base of both consideration of heat transfer performance and resistance, the optimization and research are carried out on single spiral duct double pipe condenser.
本文在综合考虑传热性能和摩擦阻力等因素的基础上，对单螺旋槽套管式冷凝器的结构进行了优化和研究。
This paper deals with the relationship between friction resistance on the pipe wall and the pumpability of concrete mixtures, and also studies the equipment for friction resistance measuring.
本文介绍混凝土对管壁的摩阻力与可泵性之间的关系，摩阻力测定装置。
Based on the resistance method, a method to measure the soil corrosive rate of pipe material reliably is established through improving measuring technology in the paper.
在电阻法的基础上，通过改进测试技术，建立了一种可以获得可靠管材土壤腐蚀速率数据的测试方法。
The heat pipe and heat exchanger have the advantages of high heat transmission efficiency, simple structure, safety and reliability, small fluid resistance, needing no repairing and additional power.
热管及热管换热器具有传热效率高、结构简单、安全可靠、安装方便、流体阻力小、不需维修和外加动力等优点，已经获得了广泛的工业应用。
The features of electric resistance welded(ERW) carbon steel pipe are analyzed from the viewpoint of design code and material selection.
从设计规范与管材选用方面对电阻焊碳钢直缝钢管（ ERW）的特点进行了分析。
PPR pipe is a new type construction material widely used in civilian and industrial water supply and sewerage system, but it is poor in hot and pressure resistance.
(无规共聚聚丙烯)管材是广泛应用于民用和工业给排水系统的一种新型建筑材料，但存在耐热、耐压性能方面的不足。
The new color polyethylene coated steel pipe developed by applying this analysis has corrosion resistance in severe corrosion environments as well as long weatherability.
应用这些分析结果，不仅可使新的有色聚乙烯涂覆钢管在恶劣腐蚀环境介质情况下具有高的耐腐蚀性，而且有长的耐气候性。
The chemical composition, mechanic property, weldability and corrosion resistance of argon arc welding wire for low carbon steel pipe line are contrasted and analyzed.
对低碳钢管线用的氩弧焊丝的化学成分、机械性能、可焊性能、耐腐蚀性能进行对比分析，为合理选用焊丝提供了依据。
The simulation by adding stable state fault was used to study the effect of flow resistance coefficient of oxidant pipe in gas generator and chamber and oxidant temperature on the engine parameters.
用添加稳态故障的方法分析了燃气发生器和燃烧室氧化剂管路流阻系数，以及氧化剂温度对发动机参数的影响。
The stress distribution of a curved pipe with an initial elliptic cross section under internal pressure was studied by using electric resistance strain method.
采用电阻应变测量技术研究了带有初始随圆度的弯管在纯内压作用下的应力分布。
The composite steel pipe made by the technology of SHS thermit centrifugal casting has excellent wear resistance and can be widely used in mines, electric power and building materials industry.
利用SHS铝热离心铸造技术制备的陶瓷内衬复合钢管具有优异的耐磨损性能，可广泛地应用于矿山、电力、建材等工业部门。
On the resistance of capillary hysteresis, the model of high power pulsating heat pipe is improved and the flow and heat transfer are further studied.
在毛细滞后阻力方面，改进了所建立的高功率脉动热管的模型，进一步研究了脉动热管的流动和传热特性。
The corrosion resistance and weatherability of color polyethylene coated steel pipe were investigated.
试验了彩色聚乙烯涂覆钢管的耐腐蚀性和耐气候性。
These measures significantly reduce the resistance and laminar flow zone in the shell side. The gas pipe connection orientation on the shell side can be freely selected.
这些措施显著降低了壳程阻力和滞流区，壳程的气体接管方位可任意选定。
The bottom of the body designed no concave nest. So have lower flowing resistance and prevent valves leakage or damage from trash pipe up.
阀体底部设计无凹槽，球阀因此具有流阻小，阀体防止污物堆积造成阀门渗漏或损坏等特点。
The bottom of the body designed no concave nest. So have lower flowing resistance and prevent valves leakage or damage from trash pipe up.
阀体底部设计无凹槽，球阀因此具有流阻小，阀体防止污物堆积造成阀门渗漏或损坏等特点。
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