GB/T 16508.7-2022 PDF English (GB/T 16508.7-2013: Older version)

GB/T16508.7-2022 (GBT16508.7-2022): PDF in English

GB/T 16508.7-2022 GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 27.060.30 CCS J 98 Replacing GB/T 16508.7-2013 Shell boilers - Part 7: Installation ISSUED ON: MARCH 09, 2022 IMPLEMENTED ON: NOVEMBER 01, 2022 Issued by: State Administration for Market Regulation; Standardization Administration of the People's Republic of China. Table of Contents Foreword ... 3 Introduction ... 6 1 Scope ... 8 2 Normative references ... 8 3 Terms, definitions and symbols ... 9 4 Basic requirements ... 9 5 Installation base ... 10 6 Steel structure installation ... 11 7 Boiler shell, header and heating surface installation ... 12 8 Instrument and valve installation ... 20 9 Combustion equipment installation ... 23 10 Furnace wall masonry and insulation layer construction ... 25 11 Packaged boiler and assembled boiler installation ... 25 12 Auxiliary equipment installation ... 26 13 Boiler baking, boiler boiling, tightness test and commissioning... 28 14 Acceptance ... 31 Bibliography ... 33 Shell boilers - Part 7: Installation 1 Scope This document specifies the requirements for installation, commissioning and acceptance of shell boilers. This document applies to shell boilers defined in GB/T 16508.1. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. GB/T 1576, Water quality for industrial boilers GB/T 2900.48, Electrotechnical terminology of boilers GB/T 12145, Quality criterion of water and steam for power plant and steam- generating equipment GB/T 16508.1, Shell boilers - Part 1: General requirements GB/T 16508.4, Shell boilers - Part 4: Fabrication, inspection and acceptance GB/T 16508.6, Shell boilers - Part 6: Combustion systems GB 50126, Code for construction of industrial equipment and pipeline insulation engineering GB 50211, Code for construction and acceptance of industrial furnaces building GB 50231, General code for construction and acceptance of mechanical equipment installation engineering GB 50264, Code for design of industrial equipment and pipeline insulation engineering GB 50273, Standard for construction and acceptance of boiler installation engineering GB 50275, Code for construction and acceptance of fan, compressor and pump a) There shall be no mechanical damage to the boiler shell, header surface and welded short pipe. Welds shall have no obvious defects such as cracks. b) The position marks of the horizontal centerlines at both ends of the boiler shell and header shall not exceed the standard. c) According to the requirements of the technical documents, spot check the surface roughness Ra value of 5%~10% of the expansion pipe holes. If there is no regulation, it shall meet the requirements of GB/T 16508.4. d) The allowable deviation of the expansion pipe hole shall meet the requirements of GB/T 16508.4. 7.1.2 The following inspections shall be carried out before installation of the boiler shell, the support of the header and the hanging device: a) The arc contact parts shall match and meet the requirements of technical documents. b) The contact surface between the support and the steel beam shall be flat. c) The hanging device shall be firm. The installation of the spring suspension device complies with the requirements of the technical documents. 7.2 Installation of boiler shell, header and rear heating surface 7.2.1 The boiler shell shall be installed and fixed in the steel structure before it can be hoisted into place. For boiler shells directly supported by non-steel beams, firm temporary supports shall be installed. Temporary supports shall be removed before water is fed for the boiler hydrostatic test. 7.2.2 When the boiler shell and header are in place, the expansion gap of the support shall be reserved according to the expansion direction. It shall be temporarily fixed. 7.2.3 Carry out the following inspections when installing the internal devices of the boiler shell: a) The number of parts shall not be missing. b) The connection of steam and water supply connection partitions shall meet the requirements of technical documents. c) The flange joint surface shall be tight. d) The connection of the connectors shall be firm. There shall be an anti-loosening device. 7.2.4 After the boiler shell and header are installed, the center line of the boiler shell 7.4.1 Before expansion joint installation, the heating surface pipe meets the following requirements: a) There shall be no defects such as heavy skin, cracks, flattening and severe corrosion on the surface of the pipe. b) Alloy steel pipes shall be inspected one by one. c) Heating surface pipes shall be inspected and corrected for shape. d) The heating surface pipes shall be arranged neatly. The deviation between the local pipe section and the designed installation position shall meet the requirements of the drawing. e) The inclination of the end face of the expansion joint shall comply with the design drawings and technical documents. 7.4.2 Pipe expansion operators shall understand the pipe expansion process and expansion rate parameters. The expansion test shall be carried out again when the operator is replaced. 7.4.3 When the hardness of the expansion joint end of the unannealed pipe is greater than or equal to the hardness of the boiler shell pipe plate, the pipe end of the expansion joint pipe shall be annealed. When the hardness of the expansion joint pipe end is less than the hardness of the pipe hole wall of the boiler shell pipe plate, the pipe end may not be annealed (except for the special material expansion process). 7.4.4 Before expansion, the surface oil at the end of the pipe shall be removed. Polish to a metallic sheen. Lubricating grease shall be applied inside the pipe end and on the rollers and expansion rods of the expander. Grease shall not seep into the interface between the hole and the pipe. 7.4.5 During expansion, the ambient temperature shall be 0°C or above. When the ambient temperature is below 0°C or in other bad weather, protective measures shall be taken. 7.4.6 Test expansion shall be carried out before formal expansion. The specimen shall be inspected. Expansion shall be free of cracks. The transition part of the expansion joint shall be even and smooth. There shall be no defects such as peeling, wrinkles, and cuts in the joint state of the root of the expansion pipe and the pipe hole. The contact marks and meshing conditions between the pipe hole wall and the pipe outer wall, pipe wall thinning, and pipe hole deformation shall be checked, so as to determine the pipe expansion rate. 7.4.7 The expansion joint shall be selected according to the measured data of the pipe hole directly and the outer diameter of the pipe end after grinding. The maximum gap between the expansion pipe hole and the pipe end shall meet the requirements of design drawings and process documents. 7.4.8 Expand the pipe according to the requirements of GB/T 16508.4, and meet the following requirements: a) After the pipe end is installed in the pipe hole, it shall be expanded immediately. b) After the reference pipe is fixed, it shall be expanded from the middle to both sides. c) Calculate the pipe expansion rate according to the inner diameter control method or the outer diameter control method. When using the inner diameter control method, the pipe expansion rate shall not exceed the range of 1.0%~2.1%. When using the outer diameter control method, the pipe expansion rate shall not exceed the range of 1.0%~1.8%. 7.5 Hydrostatic test 7.5.1 During boiler installation, the pressure elements shall undergo hydrostatic test after non-destructive testing and heat treatment. 7.5.2 After the installation of the pressurized steam and water system of the boiler and its accessories is completed, a hydraulic test shall be carried out. Before installation of cast iron economizers, it is advisable to carry out hydrostatic test one by one (or group). 7.5.3 The main steam valve, water outlet valve, blowdown valve and feed water shut- off valve shall be subjected to hydrostatic test together with the boiler. The safety valve shall be subjected to pressure test independently. 7.5.4 Carry out the following checks before the hydrostatic test. a) Internal cleaning and surface inspection shall be carried out for pressure components (elements) such as boiler shells and headers. b) Water cooling walls, convection pipe bundles and other pipes shall be kept unblocked. c) There shall be no less than 2 pressure gauges installed. For boilers with rated working pressure less than 2.5 MPa, the accuracy level of the pressure gauge shall not be lower than 2.5. For boilers with a rated working pressure of not less than 2.5 MPa, the accuracy level of the pressure gauge shall not be lower than 1.6. The pressure gauge shall be calibrated as qualified. The range of the dial shall be 1.5 to 3 times the test pressure, preferably 2 times. d) Install drainage pipes at the lowest point of the system. Install a vent valve at the highest point of the system. 7.5.5 During the installation process of the boiler, the hydraulic pressure test of the requirements: a) The materials, elements and manufacture of pressure piping shall meet the requirements of relevant manufacturing supervision and inspection of boiler components. b) The opening of pressure piping and equipment shall meet the requirements of design drawings and process documents. c) When the pressure taking device and the temperature measuring element are installed on the same pipe section, the pressure taking device shall be installed upstream of the temperature measuring element. d) The installation of the flowmeter shall be in accordance.......
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