原文：
为了提高水泵的吸入性能，管道泵吸入管路应尽可能缩短，尽量少拐弯（弯头{zh0}用大曲率半径），以减少管道阻力损失。为防止泵产生汽蚀，水泵泵吸入管路应尽可能避免积聚气体的囊形部位，不能避免时，应在囊形部位设DN15或DN20的排气阀。当泵的吸入管为垂直方向时，吸入管上若配置异径管，则应配置偏心异径管，以免形成气囊。 为了避免管道、阀门的重量及管道热应力所水泵产生的力和力矩超过泵进出口的{zd0}允许外载荷，在泵的吸入和排出管道上须设置管架。泵管口允许{zd0}载荷应由水泵制造厂提供。 垂直进口或垂直出口的泵，为了减少对泵管口的作用力，管口上方管线须设管架，其平面位置要尽量靠近管口，可以利用管廊纵梁支吊管线，所以常把泵布置在管廊下。 输送密度小于650Kg/m3的液体，水泵如液化石油气、液氨等，泵的吸入管道应有1/10~1/100的坡度坡向泵，使气化产生的气体返回吸入罐内，以避免泵产生汽蚀。 单吸泵的进口处，{zh0}配置一段约3倍进口直径的直管。 对于双吸入泵，为了避免双向吸入水平离心泵的汽蚀，水泵双吸入管要对称布置，以保证两边流量分配均匀。垂直管道通过弯头直接连接，但泵的轴线一定要垂直于弯头所在的平面。此时，进口配管要求尽量短，弯头接异径管，再接进口法兰。在其它条件下，泵进口前应有不小于3倍管径的直管段。 泵出口的切断阀和止回阀之间用泄液阀放净。管径大于DN50时，也可在止回阀的阀盖上开孔装放净阀。同规格泵的进出口阀门尽量采用同一标高。 非金属泵的进出口管线上阀门的重量决不可压在泵体上，应设置管架，防止压坏泵体与开关阀门时扭动阀门前后的管线。 蒸汽往复泵的排汽管线应少拐弯，水泵在可能积聚冷凝水的部位设排放管，放空量大的还要装设消音器。进汽管线应在进汽阀前设冷凝水排放管，防止水击汽缸。 蒸汽往复泵在运行中一般有较大的振动，与泵连接的管线应很好地固定。 当泵出口中心线和管廊柱子中心线间距离大于0.6m，出口管线上的旋启式止回阀应放在水平位置，此时不允许在阀盖上装放净阀。 当管线架在泵和电动机的上方时，为不影响起重设备吊装，水泵管线要有足够的高度。输送腐蚀性液体的管线不宜布置在原动设备的上方。 管廊下部管线的管底至地坪的净距离不应小于4m，以满足检修要求。 当管线架在泵体上方时，管底距地面净空高度应不小于2.2m。

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译文：
To improve the pump's suction performance, pipeline pump suction line should be as short as possible, turning as little as possible (preferably with large curvature radius elbow), to reduce the pipeline pressure drop. In order to prevent pump cavitation generated, Pump suction line as far as possible to avoid the accumulation of gas capsule-shaped parts can not be avoided, should form part of the capsule located in the exhaust valve DN15 or DN20. When the pump suction pipe for the vertical direction, the suction pipe, if configured Reducer, eccentric reducers should be configured, so as to prevent air bag. In order to avoid pipes, valves and piping the weight of thermal stress generated by the pump power and torque than the maximum allowable pump export and import external load, the pump suction and discharge piping shall be tube frame. Pump nozzle to allow the maximum load by the pump manufacturer to provide. Import or export of vertical vertical pumps, in order to reduce the forces on the pump nozzle, pipe lines shall be located above the exit tube frame, the plane should be as close to the nozzle position, you can use the pipe rack rails for suspending the pipeline, so often to pump arrangement in the tube porch. Transmission density of less than 650Kg/m3 liquid pump, such as liquefied petroleum gas, ammonia, etc., with suction pipes should be 1 / 10 ~ 1 / 100 of slope and aspect pump, so that the gases produced by gasification the tank back to inhalation, to avoid pump cavitation generated. Single suction pump inlet, the best configuration of an approximately three times the diameter of straight pipe imports. For the double-suction pump, in order to avoid inhalation of the level of bi-directional centrifugal pump cavitation, pump suction pipe to dual symmetrically to ensure uniform flow distribution on both sides. Directly connected by a vertical pipe elbow, but the pump's axis must be perpendicular to the plane where the elbow. At this point, the import with regulatory requirements as short as possible, then bend diameter pipe, connect the import flange. In other conditions, the pump inlet should be not less than 3 times before the diameter of straight pipe. Export pump shut-off valve and check valve placed between the net with a vent valve. DN50 diameter greater than when the check valves can also be put in a net valve cover openings. Import and export with the specifications of the pump valve as far as possible the same elevation. Non-metallic pump the weight of import and export pipeline valve must not be pressure on the pump body should be set to pipe rack, to prevent crushing when the pump and switching valves before and after the pipeline twist valve. Reciprocating pump exhaust steam pipe should be little corner, pumping may accumulate at the site of condensate discharge pipe located, emptying even the installation of high-volume muffler. Into the steam pipe into the steam valve should be set before the condensed water discharge pipe to prevent water hammer cylinder. In the operation of steam reciprocating pump generally have larger vibrations, and the pump connecting piping should be well fixed. When the center line of pump and pipe columns and child is greater than the distance between the center line of 0.6m, the export pipeline on the swing check valves should be placed in horizontal position, at this time does not allow the valve cover valve put in the net. When the pipeline pumps and motors mounted on the top, in order to not affect the lifting equipment lifting, pipeline pumps have enough height. Corrosive liquids pipeline transport should not be arranged on the top of the original moving equipment. Department of pipeline pipe tube porch floor to the bottom of the net distance of not less than 4m, in order to meet the maintenance requirements. When the pipe rack in the pump above, the tube end from the ground clearance height shall be not less than 2.2m.