Tham khảo tài liệu 'rules of thumb for mechanical engineers 2010 part 9', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 190 Rules of Thumb for Mechanical Engineers TRANSPORTATION PIPE LINES Steel Pipe Design The maximum allowable design pressure stress will depend upon the intended service for the pipe line. Pipe lines to be used for transporting liquid petroleum are covered by ANSI ASME Liquid Petroleum Transportation Piping Systems. Pipe lines used for transporting gas are covered by ANSI ASME Gas Transmission and Distribution Systems. Pipe lines which must be operated in compliance with the Federal Pipeline Safety Regulations will also need to comply with the applicable parts of these regulations Part 192 for gas transportation systems and Part 195 for liquid transportation systems. Gas Pipe Lines ANSI ASME The maximum allowable pressure is calculated by the following equation p 2St D X F X E X T where p Design pressure lb s Specified minimum yield strength lb see Table 1 t Nominal wall thickness in. D Nominal outside diameter in. F Design factor see Thble 2 E Longitudinal joint factor see Table 3 T Temperature derating factor see Table 4 Class location definitions may be obtained from p. 192. Ill of Part 192 of the Federal Pipeline Safety Regulations. A typical calculation is as follows Pipe 16 OD X wt API 5LX X52 ERW Location Class 1 therefore F see Table 2 Tbmperature 90 F Temp factor T 1 see Table 4 Joint Factor E see Table 3 p 2 X 52 000 X X X 1 X 1 p 1 170 lb gauge Table 1 Specified Minimum Yield strength for steel and Iron Pipe Commonly Used in Piping Systems Specification Grade Type1 SMYS psi API5L A25 . . BW ERW s 25 000 API5L A . . ERW FW 5 DSA 30 000 API5L B . ERW FW S DSA 35 000 API 5LS Note 2 1 A . . ERW DSA 30 000 API5LS B . . ERW DSA 35 000 API5LS X42 . ERW DSA 42 000 API5LS X46 . ERW DSA 46 000 API5LS X52 . . ERW DSA 52 000 API5LS X56 . . ERW DSA 56 000 API5LS X60 . . ERW DSA 60 000 AP15LS X65 . . ERW OSA 65 000 API 5LS X70 . . ERW DSA 70 000 API 5LX Note 2 X42 . . . . ERW FW s DSA 42 000 API 5 LX X46
