HG/T 2472-1993 Technical requirements for polyvinyl chloride fluidized bed dryers
Some standard content:
Chemical Industry Standard of the People's Republic of China
HG/T2472-93
Technical Conditions for Polyvinyl Chloride Fluidized Bed Dryers1993-06-30 Issued
1994-01-01 Implementation
The Ministry of Chemical Industry of the People's Republic of China Issued Chemical Industry Standard of the People's Republic of Chinabzxz.net
Technical Conditions for Polyvinyl Chloride Fluidized Bed Dryers 1 Subject Content and Scope of Application
HG/T2472-93
This standard specifies the technical requirements for the manufacture, installation, inspection, testing and acceptance of polyvinyl chloride fluidized bed dryers (hereinafter referred to as dryers).
This standard applies to polyvinyl chloride fluidized bed dryers with a drying moisture content (weight wet basis) of 23%~27%, a temperature of 40~70℃, and a particle size of 30~350um.
2 Reference standards
GB1804
GB2270
GB3280
GB3281
GB4226
GB4227
GB4237
GB4241
GB4242
GB5117
GB9439
HG5-1585
ZBJ04005
3 Materials
Technical conditions for high-quality carbon purple structural steel
Carbon structural steel
Stainless steel electrodes
Gas welding, manual arc welding Basic types and sizes of weld grooves for gas shielded welding Basic types and sizes of weld grooves for submerged arc welding Tolerances and fits Limit deviations of dimensions without tolerances Stainless steel seamless pipes
Stainless steel cold-rolled steel plates
Technical conditions for thick plates of stainless acid-resistant and heat-resistant steels Cold-finished stainless steel bars
Stainless steel hot-rolled equal-leg angles
Stainless steel hot-rolled steel plates
Stainless steel wire rods for welding
Stainless steel wire for welding
Carbon steel welding rods
Grey cast iron parts
Technical conditions for packaging of chemical machinery accessories
Penetrant flaw detection methods
3.1 The materials used for the dryer should have a factory certificate of conformity and a quality certificate. 3.2
In addition to meeting the requirements of this standard, materials shall also meet the requirements of the drawings. 3.3
The shell, perforated plate and parts in contact with materials shall meet the requirements of GB3280, GB3281, GB4227 and GB4237.
Bars and flat steel shall meet the requirements of GB4226. 3.5 Heat exchange tubes shall meet the requirements of GB2270. 3.6 Carbon steel parts such as cabinet frames, external supports and reinforcing ribs shall meet the requirements of GB699 and GB700. Approved by the Ministry of Chemical Industry of the People's Republic of China on June 30, 1993 and implemented on January 1, 1994
3.7 Cast iron parts shall meet the requirements of GB9439. HG/T2472-93
3.8 Welding rods shall meet the requirements of GB983 and GB5117. 3.9 Welding wires shall meet the requirements of GB4241 and GB4242. 4 Manufacturing
4.1 General requirements
4.1.1 In addition to complying with this standard, the manufacturing of dryers shall also comply with the requirements of the drawings. 4.1.2 The cutting of materials shall be done by mechanical methods. For example, when using flame cutting, the cut surface shall be polished smooth. 4.1.3 The limit deviations of the unmarked dimensions of the machined and non-machined surfaces shall be in accordance with the JS14 and JS16 accuracy requirements of GB1804.
4.1.4 The machined sealing surface shall not have defects such as cracks, scratches, pores, spots, burrs, etc. 4.1.5 Stainless steel parts and their welds shall be pickled and passivated. 4.2 Frame
4.2.1 Angle steel flanges shall be straightened before drilling, and the straightness tolerance shall not be greater than 1/1000 (1 is its length). And it shall not be greater than 4mm. 4.2.2 The deviation of the center distance between two adjacent holes of the angle steel flange should not be greater than ±0.6mm, and the deviation of the center distance between any two holes should not be greater than ±1.5mm. 4.2.3 The frame angle steel flange should have a matching position mark after drilling. 4.2.4 When assembling the frame and the rib plate on the fixture, the contact side with the shell plate should be flush. After welding, the flatness tolerance should not be greater than 0.51/1000 (1 is the length of the long side) and should not be greater than 4mm. 4.2.5 After welding, the opposite sides of each frame should be parallel, and the adjacent sides should be vertical. The difference between the lengths of the two diagonals should not be greater than 1/1000 (1 is the length of the long side) and should not be greater than 4mm.
4.3 Shell plate
4.3.1 The misalignment of the weld joint should not be greater than 0.2mm. After welding, the welds on both sides should be ground and leveled. 4.3.2 The inner surface roughness Ra value should not be greater than 3.2μm. 4.3.3 Interface welds should avoid bends and ribs. 4.3.4 All butt welds should be inspected for kerosene penetration 4.4 Shell
4.4.1 The frame and shell plate are welded together to form a shell. After welding, the inner surface should be smooth, and the flatness tolerance should not be greater than 1/1000 (I is the length of the long side), and should not be greater than 6mm,
4.4.2 After each shell is manufactured, the length and width limit deviation is ±, and the corresponding size tolerance of the two matching pieces should not be greater than 3mm, 4.4.3 After each shell is manufactured, the geometric shape should be regular, and the difference between the two diagonal lengths should not be greater than 1/1000 (1 is the length of the long side), and should not be greater than 5mm.
4.5 Porous plate
4.5.1 After processing, the opposite sides should be parallel and the adjacent sides should be perpendicular. The difference between the two diagonal lengths should not be greater than 1/1000 (1 is the length of the long side) and should not be greater than 4mm.
4.5.2 The surface should be smooth and the surface roughness Ra value should not be greater than 3.2um. 4.5.3 After hole processing, burrs and metal chips in the holes should be removed. 4.5.4 After butt welding, the weld should be smoothed and the whole plate should be leveled. 4.5.5 The butt joint of porous plates should be carried out on a special jig. The butt gap of the weld should not be greater than 0.1mm, and the misalignment of the butt joint should not be greater than 0.1 mm.
4.5.6 The welding between the porous plate and the frame should be firm and tight, and the gap should not be greater than 0.1mm. 4.6 Heat exchange tube
4.6.1 The tube end face and the tube center line should be perpendicular, and the verticality tolerance should not be greater than 0.5mm2
HG/T2472--93
4.6.2 The roundness tolerance of the elbow should not be greater than 7%Dg. The inspection quantity is 10% of the total. 4.6.3 The two end faces of the elbow should be flush, and the flatness tolerance should not be greater than 0.2mm. 4.6.4 The elbows that pass the inspection should be boiled with alkali to remove oil, and rinsed with clean water after boiling. 4.6.5 The gap between the weld joints of the heat exchange tubes should not be greater than 1.0mm, and the coaxiality tolerance should not be greater than 0.3mm. 4.6.6 The weld joints of the heat exchange tubes should not have undercuts, and the undercuts of the steel strips welded with the steel strips should not be greater than 0.5mm. 4.6.7 The weld joints and the parent material should have a smooth transition, the weld excess height is 0~1.0mm, and the width difference should not be greater than 1.0mm. 4.6.8 The weld joints of the heat exchange tubes should be color checked according to ZBJ04005, and those that are unqualified should be repaired. 4.6.9 After the heat exchange tube group is welded, the geometric shape should be regular, the top and bottom of the tube group should be flush, the flatness tolerance should not be greater than 1.5mm, and the difference between the two diagonals on the two sides should not be greater than 15mm. 4.6.10 The distance between the outer walls of two adjacent tubes in the tube group should not be less than 3mm. The heat exchange tubes shall be subjected to air pressure test before pickling, after pickling, after welding and after forming the tube group. The test pressure shall be 1.5 of the design pressure. 4.6.11
The air pressure test can be checked in water or with a foaming agent. If there is no leakage, it is qualified. If it fails, it shall be tested again after repair. 4.6.12
3 The air pressure test medium is compressed air or nitrogen. 4.6.13
Necessary safety measures shall be taken during the test.
4.7 Mechanical disperser
4.7.1 The surface roughness Ra value of the shaft and rod shall not be greater than 3.2um. 4.7.2 A dynamic balance test shall be carried out before assembly, and the test results shall be recorded. Test speed n=300r/min
b. The unbalance should not be greater than 30g·cm,
4.7.3 After assembly, it should be manually flexible and there should be no jamming phenomenon. 4.8 Welding
4.8.1 Welders should pass the examination according to the "Boiler Pressure Vessel Welder Examination Rules". 4.8.2 Except for those indicated in the drawings, the welding structure type should comply with the provisions of GB985 and GB986. 4.8.3 Before welding stainless steel parts, the groove and the edges on both sides should be cleaned of oil and dirt within 20mm. 4.8.4 Before welding, the welding rod should be dried according to the requirements of the instruction manual. 4.8.5 The geometric dimensions of the weld should comply with the requirements of the drawings. There should be no defects such as incomplete penetration, cracks, pores and slag inclusions, otherwise it should be repaired. 4.8.6 The weld and the parent material should have a smooth transition, and the surface should be clean of slag and spatter, etc. 4.8.7 The weld surface in contact with the material must be ground flat and polished according to the drawing requirements 4.8.8 The fillet welds should be inspected for air permeability. If there are any defects, they should be repaired and then re-inspected. 5 Trial assembly
5.1 Each component of the dryer should be trial assembled. The components should not be forced to bear force. They should fit well and meet the requirements of the drawings. 5.2 After the trial assembly is qualified, the matching marks are made and then disassembled. The components should not be damaged or deformed after disassembly. 5.3 After disassembly, polish according to the requirements of the drawings. The carbon steel surface is coated with red lead and then silver powder. 6 Installation and trial operation
6.1 Installation
6.1.1 The installation reference surface should be specified when installing the dryer. The horizontal tolerance of the reference horizontal surface in the length direction should not be greater than 4mm, and the tolerance in the width direction should not be greater than 1.5mm.
6.1.2 After the installation is qualified, the air tightness test of the dryer air chamber should be carried out, and the test pressure is the design pressure. 6.1.3 During the test, the pressure should rise slowly, and the air intake should be 3m2/min. When the specified pressure is reached, the pressure should be maintained for 10 minutes. Use soapy water or other 3
HG/T2472-93
foaming agent to check each connection. There should be no leakage and abnormality, and the test results should be recorded. 6.1.4 After installation, the heat exchange tube group should be tested with air pressure according to the provisions of 4.6.11~6.4.14. If there is leakage, repair it and then test it. 6.2 Test run
After the installation test is qualified, the rotating mechanical disperser shall be tested according to the following requirements and records shall be kept. a. Speed n=330r/min;
b, operation time: 2h;
bearing temperature rise: should not exceed 20;
d. No abnormal sound.
7 Inspection and Acceptance
All composite dryers must pass the inspection according to Chapters 4, 5, and 6, and be shipped with a certificate of conformity. 8 Nameplate
8.1 The dryer should be equipped with a nameplate at the position specified in the drawing, and the nameplate specifications should comply with the provisions of JB8. 8.2 Nameplate Contents
a. Equipment Name
b. Equipment type
Equipment capacity
dDesign pressure
Design temperature
10,000 tons/year
f.Heat exchange area
Factory number
Factory date
Manufacturer name
9Packaging and transportation
Drying area
9.1Dryer packaging shall comply with the provisions of HG5-1585, heat exchange tube
Heat exchange tube
Cooling area
9.2When packing, the parts shall be well padded and cannot move. The polished surface of stainless steel shall be padded with foam plastic. 9.3The packaging box shall be firm and reliable, and shall be numbered. The words and signs on the outer wall of the packaging box shall be clear and neat. 9.4The packaging box shall indicate the center of gravity and direction of lifting. 9.5
Check the packing box after packing, and ship after passing the inspection. 10
Factory documents
10.1 Product certificate
10.2 Product quality certificate
a. Mechanical disperser dynamic balance test report; b. Weld non-destructive inspection report;
c. Heat exchange tube group air pressure test report
10.3 Dryer completion general drawing
10.4 Installation instructions,
10.5 Dryer operating instructions
Additional instructions:
This standard is proposed by China National Chemical Equipment Corporation. HG/T2472-93
This standard is under the jurisdiction of the chemical machinery and equipment standardization technical unit of the Ministry of Chemical Industry. This standard was drafted by Jinxi Chemical Machinery Factory, and the drafters of this standard were Sun Yanzhang, Wu Guimin, and Su Jicai. People's Republic of China
Chemical Industry Standard
Technical Specifications for Polyvinyl Chloride Fluidized Bed Dryer HG/T2472-93
China National Chemical Equipment Corporation
Postal Code 100011
Printed by Beijing Institute of Chemical Technology Printing Plant
Copyright reserved
Open and combined edition
880×1230
First edition in June 1994
No reproduction
120,000 words
First printing in June 1994
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