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.

How to install a Butterfly Valve and construct Chamber? Here I share some pictures describing procedures of Butterfly Valve installation and Chamber construction for 1200 mm diameter DI pipe. 1. 100mm thick cc casting with C20 concrete. Then make a layout for re-bar binding. 2. Then start re-bar binding according to drawing. In this case 16mm dia Grade 60 re-bars are used. Must maintain the c/c distance and clear cover. During bending the re-bar development length must have to maintain as per drawing. 3. When re-bar binding finish then the workmanship must be checked by the consultant. 4. After checked by the consultant start form setting. Use required size of block to maintain clear cover. Provide necessary support to prevent form failure during casting. In this case 75mm block are used.                                   5. Before casting check the slump value of concrete. Take cube for compression strength test.