Obstruction of Drain Pipes by Roots

Head Loss Characteristics of Flap Gates at the Ends of Drain Pipes

Flap gates are commonly used at the end of pipe drains and pump outlets to prevent backflows of water and entry of small animals. Flap gates are relatively inexpensive, with low maintenance costs, but can trap debris in their hinge systems. Many texts refer to studies performed on flap gates at the University of Iowa in 1936, which may be limited in value because they are for specific “lightwei...

Abdominal Drain-Associated Early Postoperative Small Bowel Obstruction

Abdominal Drain Causing Early Small Bowel Obstruction After Laparoscopic Colectomy

We report a rare drain-related complication leading to small bowel obstruction after laparoscopic colectomy. An 82-year-old man developed small bowel obstruction on the second day after laparoscopic anterior resection. Emergency relaparoscopy found herniation of the small bowel mesentery into the side holes of the silicon intraabdominal drain, which led to a 90-degree acute turn of the small bo...

Health Monitoring of Welded Steel Pipes by Vibration Analysis

In the present work, structure health monitoring (SHM) of welded steel pipes was used to diagnosis their state via vibration based damage detection techniques. The dynamic quantities such as Frequency Response Functions (FRFs), mode shapes and modal parameters from structural vibration to detect damage were measured, set on linear averaging mode, with a maximum frequency of analysis of 3.2 kHz....

Corrosion Evaluation of Pipes by Radiography

N. Rastkhah, K. Edalati, A. Kermani, M. Seiedi, A. Movafeghi Safety and Radiation Protection Technological Center, Iranian Nuclear Regulatory Authority, Atomic Energy Organization of Iran, Northern Kargar Ave., Tehran, Iran Abstract: This study is a new attempt followed the research project conducted by IAEA in a Contract Research Project (CRP). In this new challenge, the reference blocks desig...