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...

Leakage Testing of Pressurized Water Pipelines: A Case Study on a 1200 mm Diameter Ductile Iron Pipeline In pressurized water pipeline systems, leakage testing is a critical procedure to ensure the integrity, safety, and long-term performance of the infrastructure. Any undetected leakage within the system can lead to significant water loss, structural damage, and potential service disruptions. Therefore, conducting a proper leakage test is not only a technical requirement but also an essential quality assurance measure. Leakage testing is typically carried out by applying internal pressure to a defined section of the pipeline. Each segment is tested individually to verify its performance under specified pressure conditions. Once all individual segments meet the acceptable criteria, a final test is conducted for the entire pipeline system to confirm its overall integrity. This article focuses on the leakage testing procedure for a one-kilometer-long ductile iron (DI) pipeline with a ...

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.                                                                            ...