JBT80591996高压锅炉给水泵技术条件

J71JB/T8059－1996高压锅炉给水泵技术条件1996-09-03发布1997-07-01实施中华人民共和国机械工业部发布I前言1范围····················································································································································································································12引用标准·········································································································································································································13术语····················································································································································································································34技术要求·········································································································································································································45试验方法·······································································································································································································106检验规则·······································································································································································································117成套范围和保证期··················································································································································································118标志、包装、运输、贮存···································································································································································12附录A（标准的附录）高压锅炉给水泵数据单·····················································································································13JB/T8059－1996目次II前言本标准总结我国多年来在高压锅炉给水泵研究、设计、制造、运行、检修等方面经验的同时，参考了德国KSB公司、瑞士苏尔寿公司等有关标准制定。本标准的附录A是标准的附录。本标准由全国泵标准化技术委员会提出并归口。本标准起草单位：沈阳水泵研究所、沈阳水泵厂、上海凯士比泵有限公司。本标准主要起草人：陈荆山、周绍珩、朱力强、骆世芬。JB/T8059－199611范围本标准规定了高压锅炉给水泵（以下简称泵）的技术要求，试验方法和检验规则等。本标准适用于单机容量为200~600MW火力发电机组锅炉给水的泵。50~125MW容量的火力发电机组用泵可以参照采用。2引用标准下列标准所包含的条文，通过在本标准中引用而构成为本标准的条文。本标准出版时，所示版本均机械工业部1996-09-03批准中华人民共和国机械行业标准高压锅炉给水泵技术条件JB/T8059－19961997-07-01实施JB/T8059－19962JB/T8059－19963GB1220—92不锈钢棒GB2100—80不锈耐酸钢铸件技术条件GB3077—88合金结构钢技术条件GB3216—89离心泵、混流泵、轴流泵和旋涡泵试验方法GB3323—87钢熔化焊对接接头射线照相和质量分级GB5677—85铸钢件射线照相及底片等级分类方法GB7021—86离心泵名词术语GB7233—87铸钢件超声探伤及质量评级方法GB9113—88整体钢制管法兰GB9115—88对焊钢制管法兰GB9239—88刚性转子平衡品质许用不平衡的确定GB9439—88灰铸铁件GB10889—89泵的振动测量与评价方法GB10890—89泵的噪声测量与评价方法GB11352—89一般工程用铸造碳钢件GB/T13384—92机电产品包装通用技术条件JB1265—85汽轮机转子和主轴用真空处理的碳钢和合金钢锻件技术条件JB1581—85汽轮机、汽轮发电机转子和主轴锻件超声波探伤方法JB3964—85压力容器焊接工艺评定JB/T4297—92泵产品涂漆技术条件JB4726—94压力容器用碳素钢和低合金钢锻件JB4728—94压力容器用不锈钢锻件JB4730—94压力容器无损检测JB/T6879—93离心泵铸件过流部位尺寸公差JB/T6880.2—93泵用铸钢件ZBJ04005—87渗透探伤方法3术语本标准常用的术语符合GB7021的规定，专用的术语定义如下。3.1最小流量最小流量又称再循环流量，即泵内液体在不发生汽化的情况下所允许的最小运行流量。3.2最大流量在工作状态下泵不发生汽蚀、轴功率不超过原动机所允许功率时的最大运行流量。3.3工作压力泵正常运行工况（或称100%工况点）下的扬程（换算为给水温度下的压力）与该工况下的进口压力之和。3.4最大工作压力JB/T8059－19964泵在最高转速下最小流量点的扬程（换算为给水温度下的压力）与该工况下的进口压力之和。3.5允许工作范围泵在规定的转速、工作温度和工作压力下的流量范围，这个范围并受到汽蚀、温升、振动、噪声、轴的挠度和其它条件限制，应由制造厂规定。4技术要求泵应符合本标准的规定，并按经规定程序批准的图样和技术文件制造。如用户有不同于本标准要求时，应按订货单和附录A的规定。4.1结构和性能4.1.1结构4.1.1.1泵采用单壳体节段式或双壳体筒式结构，300MW及其以上发电机组用泵一般应采用双壳体筒式结构。双壳体的内壳采用节段式或水平中开式结构。4.1.1.2泵应采用水平中心支承。4.1.2性能参数泵的性能参数应符合订货单或附录A或相应技术标准的规定。4.1.3特性曲线4.1.3.1制造厂应确定泵的允许工作范围（包括最小和最大流量）。4.1.3.2前置泵（升压泵）、泵的必需汽蚀余量（NPSHR）应由泵制造厂提出，并应取得设计院、电厂的认可。4.1.3.3泵出厂时应绘制工作转速试验或降速试验（见6.3.2条）换算到工作转速下的扬程、效率、轴功率、汽蚀余量与流量的关系曲线。对于调速型泵应绘制随转速变化的性能曲线。4.1.3.4泵的流量与扬程的关系曲线应是无驼峰的稳定曲线，即从设计流量到零流量的扬程是稳定上升的，其上升量不应大于设计扬程的20%~30%，关死点的扬程如超出30%则应取得用户的书面同意。4.1.4并联运行泵并联运行时，同型号的各泵分担负荷的偏差应限制在5%~10%范围以内。4.2原动机4.2.1泵驱动方式泵的原动机为电动机、汽轮机等。原动机与泵可以通过联轴器直接连接，也可通过液力偶合器或齿轮箱与泵连接。4.2.2原动机功率确定原动机功率应考虑下列因素：a）泵的最大流量工况点和正常运行流量工况点在性能曲线上的位置；b）对并联运行情况，应考虑单台泵运行时在系统特性曲线上的性能范围；c）泵的效率和设计参数；d）与液力偶合器或齿轮箱连接时应考虑其功率消耗；e）当泵组有升压泵与其同轴连接时，应计入升压泵的轴功率；f）原动机功率应不小于正常运行工况点轴功率的110%。JB/T8059－199654.3临界转速4.3.1刚性转子泵的最大工作转速nmax应小于第一临界转速nc1，取值范围：nmax≤0.8nc14.3.2挠性转子泵的工作转速n应大于第一临界转速nc1，而小于第二临界转速nc2，取值范围：1.4nc1n0.7nc2泵在起动和停车过程中，通过临界转速时不应引起任何损坏。4.4平衡、振动和噪声4.4.1静平衡4.4.1.1泵的叶轮应做静平衡，静平衡精度不低于GB9239—88中的G6.3级。4.4.1.2采取在叶轮盖板上去重时，去重处与盖板应平滑过渡，切削量不应超过盖板厚度的1/3。4.4.2动平衡4.4.2.1泵的转子一般应在工作转速下做动平衡，动平衡精度不低于GB9239—88中的G2.5级。4.4.2.2做动平衡的部件，动平衡后各零件的相对位置应固定，不应随意调换并用明显标志标出。4.4.3振动泵的振动应在现场无汽蚀的运转条件下测量，同时应考虑泵组负荷的变化，轴承体处振动值应符合GB10889的B级的规定。4.4.4噪声泵的噪声声压级应符合GB10890—89中A级的规定。距泵1m距离噪声不大于85分贝，如超出上述值应加装隔声罩。4.5承压零件4.5.1法兰泵的进、出口法兰的公称压力应能满足泵最大吸入、排出压力的要求。如采用法兰连接尺寸应按GB9113、GB9115的规定或按用户的要求设计。4.5.2吸入段和吐出段单壳体节段式泵的吸入段、吐出段设计时应进行强度计算，零件应进行水压试验（见5.2条）。4.5.3外壳体与泵盖双壳体泵的外壳体及泵盖强度计算时要同时考虑最大工作压力和热应力的影响，零件应进行水压试验（见5.2条）。零件应锻制，并应符合JB4726、JB4728的规定。密封面应堆焊耐冲蚀的不锈钢，内表面应根据条件进行堆焊。零件应做超声波、磁粉或着色检验，堆焊层应符合JB3964的规定并做硫酸铜检验。4.5.4内壳体与中段单壳体节段式泵的中段和双壳体泵的内壳体应进行强度计算，单壳体节段式中段和中开式内壳体应进行水压试验（见5.2条）。双壳体泵的内壳体应进行着色或磁粉检验。4.5.5接管JB/T8059－19966双壳体泵的吸入、吐出和抽头接管的结构和尺寸可根据需要进行设计，吐出和抽头接管应锻制，接管应选择焊接性能良好的材料，零件应进行超声波检验。在与外壳体焊接后，焊缝应符合JB3964的规定及进行着色或磁粉检验，并随外壳体一起进行水压试验，必要时接管的焊缝应进行射线探伤检验。4.5.6密封垫泵密封用的垫片应能适应规定工作条件下的最大工作压力，并能保证规定的比压和回弹系数。4.5.7穿杠、双头螺柱及其螺母单壳