tailieunhanh - Liquid Process Piping Episode 3

Tham khảo tài liệu 'liquid process piping episode 3', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | EM 1110-1-4008 5 May 99 Table 3-3 Minor Loss Coefficients K Minor loss Description K Pipe Entrance sharp edged inward projected pipe rounded Pipe Exit all Contractions sudden gradual 22 gradual 22 1 - 2 2 sin 1 - 2 sin 1 - 2 Enlargements sudden gradual 22 gradual 22 1 - 2 2 2 sin 1 - 2 2 1 - Bends 90 standard elbow 45 standard elbow Tee standard flow through run standard flow through branch Valves globe fully open angle fully open gate fully open gate 2 open ball fully open butterfly fully open swing check fully open 10 Notes angle of convergence divergence ratio of small to large diameter Sources Hydraulic Institute Pipe Friction Manual 3rd Ed. Valve data from Crane Company Flow of Fluids Technical Paper 410 reprinted by permission of the Crane Valve Group. 3-13 EM 1110-1-4008 5 May 99 Dj inside pipe diameter m ft L length of pipe m ft Le equivalent length of pipe for minor losses m ft It is common practice in design to use higher values of and n and lower values of C than are tabulated for new pipe in order to allow for capacity loss with time. Example Problem 4 An equalization tank containing water with dissolved metals is to be connected to a process tank via above grade piping. A pump is required because the process tank liquid elevation is 30 m ft above the equalization tank level. The piping layout indicates that the piping system requires - 2 isolation valves gate - 1 swing check valve - 5 standard 90 elbows and - 65 m ft of piping. The process conditions are - T 25 C 77 F and - Q m3 s ft3 s . The required piping material is PVC. The design program now requires the pipe to be sized and the pressure drop in the line to be determined in order to select the pump. Solution Step 1. Select pipe size by dividing the volumetric flow rate by the desired velocity normal service V m s . Step 2. From Table 1-1 select 150 mm 6 in as the actual pipe size and calculate .