dot4l-1999焊接绝热气瓶.pdf

Specification DOT-4L(HSE) Welded Insulated Cylinders Issue 3 March 1999. I:\THSDA5\HARRY\CYL1 Iss 3 March 1999 Contents 1.0 Type, size and service pressure and design service temperature. 2.0 Certificate of Compliance. 3.0 Duties of Inspector. 4.0 Material. 5.0 Identification of Material. 6.0 Defects. 7.0 Manufacture. 8.0 Welding. 9.0 Wall Thickness. 10.0 Heat Treatment. 11.0 Openings in Cylinder. 12.0 Safety Relief Devices and Protection for Valves, Safety Devices and Other Connections. 13.0 Pressure Test. 14.0 Physical Test. 15.0 Radiographic Examination. 16.0 Rejected cylinders. 17.0 Authorised materials of construction. 18.0 Markings. 19.0 Inspectors report. Appendix 1 Inspectors report form. I:\THSDA5\HARRY\CYL1 Iss 3 March 1999 1.0 Type, size, service pressure and design service temperature. 1.1 A DOT 4L(HSE) cylinder is a fusion welded insulated cylinder with a water capacity (nominal) not over 454 kg (1000 pounds) and a service pressure of at least 2.76 bar (40 p.s.i.g.) but not greater than 34.5 bar (500 p.s.i.g.) conforming to the following requirements: 1.1.1 For liquefied hydrogen service, the cylinders must be designed to stand on end, with the axis of the cylindrical portion vertical. 1.1.2 The design service temperature is the coldest temperature for which a cylinder is suitable. The required design service temperatures for each cryogenic liquid is as follows: Cryogenic liquid Design service temperature o 0