Hi all, I am trying to calculate the friction losses found in a suction inlet pipe for a fire pump. I have attached an image which shows the pipe we are intending to use, but have no idea how to calculate the expected friction losses we would find when using it. I know how to calculate for straight pipe and for bends, but no idea about interconnecting pipes such as this? The section consists of 2 x 5" pipes joining into a 6" diameter at the pump inlet. The angle of the 5" pipes is 90 degrees if that helps? Does anyone have any suggestions on where to start? Thanks in advance.