THINGS TO KNOW

The Karnaphuli Water Supply Project is a major infrastructure initiative undertaken by Chattogram WASA (CWASA), with financial support from Japan International Cooperation Agency . This landmark project aims to meet up to 80% of the potable water demand of Chattogram , significantly improving urban water security and public health. In this post, I am sharing a series of images highlighting key components and engineering features of the project: Image 1: A butterfly valve (blue), used for flow regulation and isolation within the pipeline system. Image 2: A double orifice air valve installed on a 400 mm diameter pipeline, designed to release trapped air and maintain efficient flow. Image 3: A gate valve, typically used for on/off control of water flow in the network. Images 4–7: The water bridge crossing over the Halda River , consisting of a 1200 mm diameter steel pipeline—an important structural element ensuring uninterrupted transmission. Images 8–13: Overcrossing s...

In pipeline construction when there is an obstruction such as bridge, culvert, large drain, utilities then we need to proceed our work either under or by the side of the existing obstruction, There are mainly two ways which are Divert Crossing and Under Crossing. Again Divert crossing are two types; Divert Under and Divert Over. Today I will share some pictures with details about a divert over cross of water pipeline. Procedure of Construction  1.This is the before construction picture  15m long bridge through which we have to carry on our pipeline work. As the depth of this bridge is very high it will be difficult to go under the bridge. So in this case we will follow the Divert Over Crossing method. 2. In the above pictures workers are trying to prevent soil collapse. For this work we need 1m3 bags, brick chips and an excavator to fill the bags with brick chips & set the bags in the desired position.            ...