问题 问答题 简答题

水压试验分几步进行?如何进行?

答案

参考答案:

水压试验的步骤为.充水.升压,强度试验.降压及严密性检查。

系统充水。水压试验的充水点和加压装置一般应设在系统或管段的较低处,以利于低处进水、高点排气.充水前将系统阀门全部打开.同时打开各高点的放气阀,关闭最低点的排水阀,连接好进水管、压力表和加压泵等。充水至放气阀不间断出水时,说明系统中空气已完全排尽.关闭放气阀和进水阀.全面检查有无漏水现象。

升压及强度试验。经检查无漏水现象后,可用加压泵加压,升压应缓慢,加压至一定数值时,应停下来对管子进行检查,无问题后继续加压,一般分2~3次升压。升至试验压力后,停止升压并关闭进水阀,记录时间,停压检查。在规定的时间内管道无变形,且压力降不超过规定值,则强度试压合格,否则修复后重新打压。

严密性试验。强度试验合格后,将压力降至工作压力。稳压下对系统进行外观检查,以不渗不漏为合格。

完形填空
完形填空。
     Sally is an English girl.  She is fourteen years old this year.  She    1   to school five days a week. She
has many 2 at school.  She has math,  English,  Chinese,  history,music,  art,  P. E.... Of all these classes,
Sally li'kes music best. She thinks   3 is very great. Sally often plays the   4   at school,  but she wants to
have one of her own(自己的)at her home.  So on her   5     birthday ier parents    6     her a new piano.
Sally is very 7   . She says, "I want to learn    8   about music, Mom. " Her mother says,"You can be 9 a
mus c club. " "OK, Mom. Thank youll go and find a   10   club tomorrow(明天). "
     Sally wants to be a singer in the future(将来) .
( )1. A. go          
( )2. A. clothes    
( )3. A. it          
( )4. A. CD          
( )5. A. fourteenth  
( )6. A. buys        
( )7. A. happy      
( )8. A. many        
( )9. A. on          
( )10.A. runner      
B. goes        
B. photos      
B. they        
B. guitar      
B. forteen    
B. sell        
B. sad        
B. more        
B. in          
B. music      
C. going      
C. books      
C. he          
C. drums      
C. forteenth  
C. buy        
C. relaxing    
C. little      
C. of          
C. musician    
D. to go          
D. classes        
D. she            
D. piano          
D. fourteen        
D. sells          
D. interestim      
D. lots of        
D. under          
D. player          
单项选择题 案例分析题