2010年专业知识上午第67题:离心泵入口,出口的压力表为 ...? 一台试验用离心泵,工作不久后发现,泵入口的真空度逐渐变为零,泵出口的压力也逐渐降低为零,此时离心泵的完全打不出水,发生故障的原因应排除下列哪几方面? a.忘了灌水 b. 吸入管路堵塞 c . 出口管路堵塞 d. 吸入管道漏气 我来一个一个说,a,不会是 工作不久后发生,应该是启动泵就能发现,只要没有灌水,肯定马上能知道,b,吸入管堵了,肯定不会出口压力为0,c,发生的现象是真空表肯定有读数,压力表也有读数,发现的现象是电流表会下降,出口压力会上升!入口真空度变化值不大! 查看更多
aspen启动之初出现如下问题,请各位帮忙。? aspen启动之初出现如下问题,请各位帮忙。谢谢! datetime sun jul 08 11:02:34 2012 failed to initialize the aspen properties enterprise. configuration file being used from c:\documents and settings\all users\application data\aspentech\aped v7.1\config.aem the following errors occurred to connect the databases: pc\sqlexpress.apv71 : a network-related or instance-specific error occurred while establishing a connection to sql server. the server was not found or was not accessible. verify that the instance name is correct and that sql server is configured to allow remote connections. (provider: sql network interfaces, error: 26 - error locating server/instance specified) pc\sqlexpress.factv71 : a network-related or instance-specific error occurred while establishing a connection to sql server. the server was not found or was not accessible. verify that the instance name is correct and that sql server is configured to allow remote connections. (provider: sql network interfaces, error: 26 - error locating server/instance specified) pc\sqlexpress.nistv71 : a network-related or instance-specific error occurred while establishing a connection to sql server. the server was not found or was not accessible. verify that the instance name is correct and that sql server is configured to allow remote connections. (provider: sql network interfaces, error: 26 - error locating server/instance specified) please use the aspen properties database configuration tester to diagnose and fix the problem. 查看更多