THINGS TO KNOW

Hello friends, Today I will share with you some pictures of Karnaphuli Water Supply Project, a mega project of Chattagram WASA (CWASA) funded by JICA to fulfill the water requirement of up to 80% of Chattagram.  In the 1st picture; it is a butterfly valve(blue),2nd picture; it is a double orifice air valve for a 400mm diameter pipe,3rd picture; it is a gate valve, 4th to 7th picture; it is the water bridge over the Halda river of 1200mm diameter steel pipe, 8th to 13th picture; these are the overcrossing of 1200mm diameter steel pipe and the last picture; it is a rapid air valve for 1200mm diameter DI pipe.

In a water pipeline where flow is generated by pressure leakage test is a very important thing, because if there is any leakage in pipeline system it may cause a serious damage. This leakage test is done by generating pressure for certain segment of a pipeline system. When test result is acceptable for different segment then test is performed for the total pipeline at a time. This article is mainly focused on the leakage test for a one kilometer ductile iron pipeline of 1200 mm diameter.  To perform the leakage test we have to follow some steps which are briefly described below;  First, we have to close the both sides of pipe by a pipe end cover. This end cover should be equally inserted all around the pipe and the joint should be mechanical type.         In the pictures workers are installing a end cap and jointing it with nuts and bolts ensuring no gasket failure. This operation should be done on both side of the segment. Second, we should provide support on t

Today I will share some pictures about pipe protection work in under crossing. 1. 300 mm thick Plain concrete casting with C25 concrete before pipe laying. In this case ready mix concrete was used.                                                                                                                     2. After curing for 7 days start DI pipe laying. Must follow the safety rules during pipe laying.                                                                                                                                                                                                                                                                              3. After pipe laying start form setting work. When form work finish proceed for  concrete casting around pipe(need 300 mm covering around the pipe surface) with C25 concrete.  After curing for 7 days, remove form work and proceed for next work. The