Design code
Design Criteria：JB/T5298,API 6D,ASME B16.34
Structure length：GB/T12221,JB/T5298,API 6D,ASME B16.10,GB/ T12221
Connection：GB/T9124.1,JB/T79,ASME B16 5, ASME B16.47 ,MSS SP44
Test and inspection：GB/T26480,API 6D,API 598
Pressure-Temperature：