蒸汽锅炉安全技术监察规程英文版

蒸汽锅炉安全技术监察规程英文版内容摘要：

ssories. For boilers with automatic control system, system to calibrate and maintain the automatic instruments periodically shall be set up. Article 17 Drawings and relative technical specifications shall be available for major repairs of boiler pressure elements, such as replacing and mending by replacing the damaged parts of barrel (drum), flue, returnfiring chamber, head, flue top, tube sheet, bottom belt, and header, patch weld of major welding, expansion joint of tubes changed to welding joint, and replacing large amount of heating tubes. Technical specification for repair may refer to the technical standard of boiler speciality and the relative technical stipulations. After repairing, the boiler operation unit shall place the technical data, such as drawings, material quality certificate, repairing quality inspection certificate on boiler technical file. Article 18 When repairing the operating boiler, it is strictly forbidden to repair pressure element under pressure or high boiler water temperature. When welding is used to repair pressure element, it is strictly forbidden to weld while there is water inside. Article 19 The technical requirements for modification of boilers and their pressure elements may refer to the technical standard of boiler speciality and the relative technical stipulations. For modifications to improve boiler operation parameters, the modification scheme shall include the necessary calculation data. Since the structure and operation parameters are changed, water treatment measures and safety accessories shall match the new parameters. Article 20 After pletion of boiler modification, boiler operation unit shall place the technical data, such as drawings, material quality certificate, construction quality inspection certificate, on boiler technical file. Chapter 3 Materials Article 21 Metal materials and welding materials, etc. used in boiler pressure elements shall conform to the relative national standard and industrial standard. The material production units shall ensure the material quality and provide quality certificate. Metal materials and weld metal shall have the specified strength, ductility, elongation and good fatigue resistance and corrosion resistance under operation conditions. Steel plates, steel tubes and welding materials used for repairing boiler pressure elements shall — 8 — be the same material brand or with the same property as the original material in the repair parts. Article 22 Metal materials used for manufacturing boiler pressure elements shall be of killed steel. The elongationδ 5 of plates at 20℃ shall not be less than 18%. For Charpy of carbon steel and carbon manganese steel under room temperature (“V” type notch sample) shock absorption power shall not be less than 27J. Article 23 Metal materials used in boiler pressure elements shall be selected according to the following requirements: 1. Steel plate Table 31 Boiler steel plate Note: ① When used for boiler pressure elements with rated steam pressure exceeding , the ponents shall not contact flame. ② Aging shock test shall be performed and qualified. ③ Operation pressure shall not be limited when manufacturing the drum not exposed to radiation heat. Type of steel Steel grade Standard No. Applicable range Operation P (MPa) Wall T (℃ ) Carbon steel Q235A, Q235B GB700 GB3274 ≤ See note ① Q235C, Q235D 15, 20 GB710, GB711 GB13237 ≤ 20R② GB6654 YB (T) 40 ≤ ≤ 450 20g 22g GB713 YB (T) 41 ≤ ③ ≤ 450 Alloy steel 12Mng, 16Mng GB713 YB (T) 41 ≤ ≤ 400 16MnR② GB6654 TB (T) 40 ≤ ≤ 400 — 9 — 2. Steel tubes Table 32 Boiler steel tubes Type of steel Steel grade Standard No. Applicable range Usage Operation P (MPa) Wall T (℃ ) Carbon steel 10, 20 GB8163 Heating surface tubes ≤ Headers, steam pipes 10, 20 GB3087 YB (T) 33 Heating surface tubes ≤ ≤ 480 Headers, steam pipes ≤ 430 20G GB5310 YB (T) 32 Heating surface tubes Not limited ≤ 480 Headers, steam pipes ≤ 430① Alloy steel 12CrMoG 15CrMoG GB5310 Heating surface tubes Not limited ≤ 560 Headers, steam pipes ≤ 550 12CrlMoVG Heating surface tubes ≤ 580 Headers, steam pipes ≤ 565 12Cr2MoWVTiB GB5310 Heating surface tubes ≤ 600② 12Cr3MoVSiTiB Note: ① It may be increased to 450℃ , when service life is requested to be within 20 years. ② When oxidation losses is considered during strength calculation, it may be raised to 620℃ . 3. Fe piece Table 33 Boiler fe pieces Type of steel Steel grade Standard No. Applicable range Operation P (MPa) Wall T (℃ ) Carbon steel Q235A, Q235B Q235C, Q235D GB700 ≤ ① ≤ 350 20, 25 GB699 ≤ ① ≤ 450 Alloy steel 12CrMo ZBJ98016 Not limited ≤ 540 15CrMo ≤ 550 12CrlMoV ≤ 565 30CrMo 35CrMo Not limited ≤ 450 25Cr2MoVA Not limited ≤ 510 Note: ① Operation pressure shall not be limited for fe pieces not exposed to flame. — 10 — ② Hollow cylinder type fittings meeting the following requirements may be machined with rolled or fed round steel of corresponding steel grade except various types of flanges。 a. Outer diameter of carbon steel fittings not greater than 160mm, outer diameter of alloy steel fittings or pipe cap ranges fittings not greater than 114mm。 b. Machined pipe fittings are qualified after non destructive test。 c. Longitudinal axis of fittings in parallel with that of round steel. 4. Cast steel Table 34 Boiler cast steel Type of steel Steel grade Standard No. Applicable range Nominal Pressure (MPa) Wall T (℃ ) Carbon steel ZG200 400 GB11352 ZBJ98015 ≤ ≤ 450 ZG230 450 Not limited ≤ 450 Alloy steel ZG20CrMo ZBJ98015 Not limited ≤ 510 ZG20CrMoV Not limited ≤ 540 ZG15CrlMolV Not limited ≤ 570 5. Cast iron Table 35 Boiler cast iron Type of cast iron Brand Standard。