DL/T 438-2009
The technical supervision codes for metal in fossil-fuel power plant (English Version)

Standard No.

DL/T 438-2009

Language

Chinese, Available in English version

Release Date

2009

Published By

Professional Standard - Electricity

Status

Be replaced 2016-12

Replace By

DL/T 438-2016

Latest

DL/T 438-2023

Replace

DL 438-2000

Scope

This standard specifies the scope of components, inspection and supervision items, content and corresponding criteria for metal supervision in thermal power plants. This standard applies to the supervision of the following metal components: a) High-temperature pressure-bearing components with operating temperatures greater than or equal to 400°C (including main steam pipelines, high-temperature reheat steam pipelines, superheater tubes, reheater tubes, headers, valve housings and Tee), and small pipes connected to pipes and headers. b) Steam guide pipes and contact pipes with operating temperatures greater than or equal to 400°C. c) Steam drums and once-through boilers with working pressures greater than or equal to 3.82MPa are used for steam-water separators and water storage tanks. d) Pressurized steam and water pipes and components (including water wall pipes, evaporation sections, economizer pipes, headers and main water supply pipes) with a working pressure greater than or equal to 5.88MPa. e) Steam turbine shaft, impeller, blades, rags, bearings and generator shaft, retaining ring, fan blades. f) Bolts with operating temperature greater than or equal to 400°C. g) Cylinders, steam chambers, main steam valves, speed regulating valves, nozzles, partitions and partition sleeves with operating temperatures greater than or equal to 400°C. h) Low-temperature reheat steam pipelines with longitudinal welds for units of 300MW and above.

DL/T 438-2009 Referenced Document

• DL 473-1992 Technical conditions for forged tee joints with high diameters
• DL 612-1996 Supervision code for boiler and pressure vessel of the power industry
• DL 647-2004 Inspection code for boiler and pressure vessel in thermal power plant
• DL/T 439-2006 The technical guide for high-temperature bolt of fossil-fired power plant
• DL/T 440-2004 The code of inspection and evaluation for existing boiler drum in fossil-fuel power plants
• DL/T 441-2004 Supervision code for creep strain of steam pipe in high temperature and high pressure in fossil fuel power plant
• DL/T 505 Ultrasonic testing rules for steam turbine main shaft weld seam*， 2016-08-16 Update
• DL/T 515-2004 Pipe bends for power station
• DL/T 531-1994 Technical Specification of Hihg Temperature High Pressure Globe Stop Valves and Gate Valves for Power Station
• DL/T 616-2006 Maintenance & adjusting guide for thermal power plant Steam-water piping and support-hangers
• DL/T 674-1999 The gradational standard of spherular pearlite for carbon steel No.20 used in fossil power plant
• DL/T 695-1999 Steel pipe butt welding fittings for power plant
• DL/T 714 Technical Guidelines for Ultrasonic Inspection of Steam Turbine Blades
• DL/T 715 Selection guide for the metallic material of fossil power plants*， 2015-04-02 Update
• DL/T 717 Technical Guidelines for Inspection of Turbine Generator Rotor Center Hole*， 2013-03-07 Update
• GB 5310-2008 Seamless steel tubes and pipes for high pressure boiler
• GB 713-2008 Steel plates for boilers and pressure vessels
• GB/T 19624-2004 Safety assessment for in-service pressure vessels containing defects
• GB/T 20410-2006 Steels for turbine bolts at high temperature
• GB/T 9222-2008 Strength calculation of pressure parts for watertube boilers

DL/T 438-2009 history

• 2023 DL/T 438-2023 Technical Supervision Regulations for Metals in Thermal Power Plants
• 2016 DL/T 438-2016 The technical supervision codes for metal in fossil-fuel power plant
• 2009 DL/T 438-2009 The technical supervision codes for metal in fossil-fuel power plant
• 2000 DL 438-2000 Technical supervision codes for metal in thermal power plants

DL/T 438-2009 The technical supervision codes for metal in fossil-fuel power plant has been changed from DL 438-2000 Technical supervision codes for metal in thermal power plants.