| Standard ID | DL/T 439-2018 (DL/T439-2018) |
| Description (Translated English) | The technical guide for high-temperature bolt of fossil-fired power plant |
| Sector / Industry | Electricity & Power Industry Standard (Recommended) |
| Classification of Chinese Standard | F20 |
| Classification of International Standard | 27.100 |
| Word Count Estimation | 18,113 |
| Date of Issue | 2018-04-03 |
| Date of Implementation | 2018-07-01 |
| Older Standard (superseded by this standard) | DL/T 439-2006 |
| Quoted Standard | GB/T 2; GB/T 3; GB/T 90.1; GB/T 90.2; GB/T 98; GB/T 196; GB/T 197; GB/T 226; GB/T 231.1; GB/T 5779.1; GB/T 5779.2; GB/T 6394; GB/T 17394.1; NB/T 47013.4; NB/T 47013.5; DL/T 441; DL/T 694; DL/T 884; DL/T 1719; DL/T 1845 |
| Regulation (derived from) | National Energy Administration Announcement No.4 of 2018 |
| Summary | This standard stipulates the selection, inspection contents, methods and treatment measures for high temperature fasteners in thermal power plants, and puts forward requirements for the fastening and disassembly of bolts. This standard is applicable to the inspection and treatment of bolts, nuts and washers for cylinders, valves, valves and steam pipe flanges with a working temperature above 400 ��C. For fasteners with a working temperature of 400 �� C and below, refer to the implementation. |