Some standard content:
Chemical Industry Standard of the People's Republic of China
HG T 2638-94
Grading of Quality of Sugar Glass Equipment
Published on October 26, 1994
Ministry of Chemical Industry of the People's Republic of China
Implementation on March 1, 1995
Chemical Industry Standard of the People's Republic of China
Grading of Quality of Sugar Glass Equipment
1 Subject content and scope of application
HG / T 2638—94
This standard is formulated based on HG2432 "Technical Conditions for Sugar Glass Equipment" and is a supporting standard of HG2432. This standard takes mixing container type glass equipment as the benchmark and adopts 100-point system to define the quality grade of mixing container type glass equipment. The quality grade of other types of glass equipment is based on the ratio of the total qualified score of the inspection results to the total score that should be obtained, multiplied by 100. This standard is applicable to the quality grade of sugar glass equipment with a design pressure less than or equal to MPa, a design turbidity higher than -20℃ and less than or equal to 200.
2 Reference standard
HG2432 Technical conditions for sugar glass equipment
3 Classification of components and test items
3.1 Classification of components
3.1.1 Main body: tank body, tank cover, stirring: 3. 1.2 Accessories: valves, thermometer sleeves, manhole covers (handhole covers), stuffing boxes. 3.2 Self-classification of assessment items
3.2.1 Key items: When the technical indicators do not meet the indicators specified in the standards, the equipment (or components) lose their original performance. The key items are the following 4 items:
(1) Glass equipment water pressure test:
(2) Jacket water pressure test;
(3) Glass equipment air tightness test:
(4) High voltage test
3.2.2 Main items: When the technical indicators do not meet the indicators specified in the standards, the equipment (or components) The service life or performance is significantly affected. The main items. There are 9 main items: (1) Resistance to sudden change:
(2) Acid resistance: CHP and CHN are resistant to hydrochloric acid; WCHP and WCHN are resistant to citric acid; (3) Alkali resistance: CHP and CHN are resistant to sodium hydroxide; WCHP and WCHN are resistant to sodium carbonate; (4) Mechanical impact resistance;
(5) Maximum and minimum diameter difference of tank flange:
(6) Tank flange flatness;
(7) Radial total runout of the upper sealing section of the agitator (it is allowed to be replaced by the radial average runout of the sealing section of the agitator shaft): (8) Radial round runout of the lower end of the agitator:
(9) Thermometer sleeve straightness
3.2.3 General items: When the technical indicators do not meet the requirements of the standard, but the items have no significant impact on the service life or performance of the equipment, they are defined as general items. There are 20 items in the following four categories for general items: (1) Thickness of glass layer;
Approved by the Ministry of Chemical Industry of the People's Republic of China on October 26, 1994, and implemented on March 1, 1995
HG/T 2638-94
2) Surface defects of glass layer: including foreign matter, scratches, dark bubbles, powder tumors, color, repair marks and edge peeling on the glass surface;
(3) Geometric deformation: including the width of the clamping surface of the body flange, the flatness of the manhole flange, the parallelism of the nozzle flange of the stirring shaft hole to the tank cover flange, the position of the reducer supports to each other and to the center hole, the maximum and minimum diameter difference of the tank body, the deformation of the upper and lower connecting rings, the position of the support, the symmetry of the anchor wing of the agitator, etc.;
(4) Appearance quality of equipment: including 4 items such as head forming, welding quality, paint quality and shaft head rust prevention. 4.2.1 Assessment of key items
All qualified products and products above the qualified level must meet the requirements of HG2432 standard 4.2.2 Assessment of main items
4.2.1 Resistance to sudden temperature change, radial full runout of the upper sealing section of the stirring head, radial round runout of the lower end of the stirring head, surface degree of the tank flange, and straightness of the thermometer sleeve are non-graded items. All qualified products and products above the qualified level must meet the requirements of HG2432 standard; 4.2.2 Assessment of graded items is carried out according to grade indicators, and the grade indicators are as follows: 4.2.2.1 Acid resistance (see Table 1),
Quality grade
Equipment type
Compliant Qualified products
First-class products
Superior products
4.2.2.2 Alkali resistance (see Table 2)
Quality level
Equipment type
Joint products
First-class products
Superior products
4.2.2.3 Mechanical impact resistance
Qualified products>220×10-3J
Superior products>240×10-3J
Superior products>260×10-
4.2.2.4 Maximum and minimum diameter difference of flange
Qualified products<1.0%D yuan
First-class products<0.7%D
Superior products<0.4%D
* D-Nominal diameter of glass reactor
43 General items of assessment
CHP, CHN
Acidity of alcohol salt
<2.00g/m2.d
<1.50g/md
<1.00 g / m*. d
Sodium hydroxide resistance
<9.00g/md
<7.20g/m2.a
<5.40 g / m2,
WCHP WCHN
Citrate
WCHP WCHN
HG/T 2638—94
According to the different influences on product quality, the weighted scoring method is adopted for assessment, and the quality is finally comprehensively evaluated by the total score. 5 Assessment Scoring Provisions
5.1 The scoring method for all assessment items of sugar glass glaze, parts and equipment shall be implemented in accordance with these provisions: 5.2 If all key items and main items are qualified (regardless of the number of items), the basic score is 60 points; 5.3 The assessment score of general items adopts weighted source, and the specific score is determined according to the influence of each item on the use function of the equipment. See Appendix A: Scoring table for quality assessment items of sugar glass equipment (including sugar glass glaze and parts), 5.3.1 Scoring and penalty rules
All the items that meet the technical index requirements of HG2432 standard shall be scored according to the scores listed in Appendix A. If they fail to meet the technical index requirements, no score will be given. Considering that some items in the general items are out of tolerance, they will also affect the use function of the product. In serious cases, they will also significantly affect the use function of the product. Therefore, these items will be penalized by the super-difference penalty method. 5.3.2 Penalty method
The penalty is based on the number of differentials of the differentials. The first level of the differential is the slight level, the second level is the obvious level, and the third level is the serious level. Based on the indicators specified in HG2432 standard, no score will be given for the differential within the first level, and 1 point will be deducted for the differential within the second level. In the future, the penalty will be increased for each new differential area.
5.3.3 Penalty grade difference
(1) Glass layer thickness: 0.3mm;
(2) Flatness of manhole flange: 0.7mm;
(3) Difference between maximum and minimum diameter of cylinder: 0.375%Dz and less than 6mm; (4) Parallelism of the pipe flange of the mixing shaft hole to the cap flange: Dw×tg1 (5) Position of the reducer supports to each other and to the center hole: 2mm; (6) Symmetry of the anchor wing of the stirrer: 3mm;
(7) Head forming: No bulge or wrinkle is qualified score, wrinkle or bulge but not exceeding the defects specified in the relevant mandatory regulations or standards is a minor defect and no score, bulge and defects exceeding the provisions of the relevant mandatory regulations or standards are serious defects and 2 points are deducted, this item does not have a significant level:
(8) Weld quality: Welds that meet the requirements are scored, bite or local misalignment but not exceeding the provisions of the relevant mandatory regulations or standards are minor defects and no score, bite or local misalignment exceeding the provisions of the relevant mandatory regulations or standards are serious defects and 2 points are deducted, this item does not have a significant level;
(9) Paint quality: Smoothness is scored, uneven dripping is not scored; (10) Deformation of upper and lower connecting rings: No deformation meets the design requirements; No points are scored if the connecting ring is deformed (or has obvious repair marks) or does not meet the design requirements (curved surface has no straight edges);
(11) Support position: Score if it meets the drawing requirements; No points are scored if it does not meet the drawing requirements; (12) Axis head rust prevention: No rust is scored, no points are scored if there is rust; (13) Glass layer surface defects: Refers to the seven items specified in the HG2432 standard, including edge peeling, scratches, dark bubbles, pulverization, foreign matter, color and burn repair marks. The assessment is divided into three levels: slight, obvious and severe. The severe level has been checked by the key high voltage resistance test. Therefore, only two levels, slight and obvious, are determined in this project. The slight level refers to the degree of defects that basically do not affect the use and no points are calculated: those exceeding the slight level will be treated as obvious levels and penalty points will be implemented. The specific regulations are as follows: Edge peeling: located at the flange edge (within 15mm), no more than 1 place per square meter, less than 1cm surface deglazing, fine grinding treatment is non-conductive, and the bottom layer thickness meets the requirements is a slight level, exceeding the level is a clear level; 3
HG/T 2638—94
Objects: no more than 3 per square meter, with an area less than 4mm2 and a mutual distance of not less than 100mm, are considered minor, and those exceeding this are considered obvious;
Nodules: no more than 1 per square meter are considered minor, and those exceeding this are considered obvious; Bubbles: no more than 1 per square meter are considered minor, and those exceeding this are considered obvious; Scars: no more than 1 per square meter are considered minor, and those exceeding this are considered obvious; Traces of burning and repairing: no more than 1 per square meter are considered minor, and those exceeding this are considered obvious; Color
Luster: directly determined by vision, those with light and dark color difference are considered minor; those with different colors are treated as obvious. 5.3.4 Quality grading standard for glass products (including glass glaze and components) Glass equipment products are produced and assembled from glass glaze and components. Therefore, the quality grade of the glass glaze and components must be ensured first, so that the quality grade of the entire equipment product can be guaranteed. This article specifies the standard scores for the quality grading of glass glaze, parts and complete equipment. The values are listed in Table 4.
Grade standard scores for quality grading of glass products (including glass glaze and parts) Table 4
Qualified products
Glass glaze
Thermometer cover
Stuffing box
Man (hand) cover
Complete equipment
6 Equipment quality classification regulations
6.1 Qualified products
6.1.1 All indicators and test methods comply with the current standards: First-class products
6.1.2 All key items and main items meet the indicators specified in the current technical conditions: 6.1.3 Its components meet the qualified product level specified in this standard; 6.1.4 Total score> points
6.2 First-class products
Excellent products
Full score
100 points
6.2.1 Various indicators and test methods All current standards are implemented 6.2.2 All key items and main items meet the indicators specified in the current technical conditions; among them, acid resistance, alkali resistance, mechanical impact resistance, and the maximum and minimum diameter difference of tank flanges meet the indicators of first-class products specified in this standard; 6.2.3 Its components meet the first-class product level specified in this standard; 6.2.4 Total score ≥ 94 points
6.3 Superior products
6.3.1 All indicators and test methods meet the current standards; 6.3.2 All key items and main items meet the indicators specified in the current technical conditions ; Among them, acid resistance, alkali resistance, mechanical impact resistance, flange maximum and minimum diameter difference and other items meet the indicators of superior products specified in this standard; HG/T2638-94
Its components meet the level of superior products specified in this standard; 6.3.3
6.3.4 For those with total score>98 points:
The main weld must be welded automatically;
The appearance should be smooth and flat, and the protective paint should be evenly distributed without sagging; The outer diameter of the tank flange should conform to the standard size or drawing size, and the allowable deviation is ±0.003DM6||tt ||2638-94
Vertical load
Mixed lower end radial load dynamic
Diameter dynamic
Environmental mixing wax density sealing section
Diameter shame
Minimum opening flange size
Increased body flatness
Minimum flange size
Blue flatness
Slight impact resistance
Film resistance
Friction resistance
Degradation resistance
High voltage test of hot material building
High voltage Medical test
Manhole handhole cover
Electrical resistance test
Jianting meter set height
Minmen commercial electrical medical test
Jiezhi high voltage test shoe
Building commercial electrical medical test
Tank static high electrical medical test
Gas cancer test
Xie glass drop said
Clamshell water pressure test
Hydraulic pressure test
Xie fatigue glass embedded equipment
Project name
Carrying glass bread color selection
Goose glass thick flour tumor| |tt||Axis glass surface
Glass cans
Burning repair marks
Scratch on glass surface
Glass surface scratches
Glass surface scratches
Glass spots
Axis head rust prevention
Stirring lock
Glass thick spots
Glass cool color
Glass wear resistance
Glass surface
Glass end dark robe
Purple repair marks
Increase Glass surface scratches
Remove foreign bodies from the surface of the glass
Remove the glass edge
Support mechanism
Up and down, ring change
Sugar body maximum and minimum diameter difference
The blue craftsman is tight and wide
Paint base
Head feeling type
Remove glass layer skin
Patch glass layer surface color scale
Remove glass layer powder tumorbZxz.net
Cultivate glass layer secret and
No glass layer
Only repair the scar||tt| |Glass layer surface rubbing
Glass layer surface foreign matter
Sparse amber layer surface and edge residual
Hole position accuracy
Chengsu machine seat mutual and center
Songlan parallelism
Difference of pipe mouth flange of sample hole
Manhole flatness
Flange width
Sleeve quality
Welding
Head molding
Glass layer thickness
Item name
HG/T 2638—94
Appendix B
Product Quality Evaluation Method for Sugar Glass Equipment (including Tang Glass Glaze and Components) (Supplement)
According to the quality grading regulations for glass equipment, the product quality grade can be determined, but it is still difficult to distinguish the quality differences between products of the same grade. In order to promote and continuously improve product quality and carry out industry quality evaluation competitions, it is necessary to further evaluate the quality of products of the same grade. This method is formulated for this purpose. It is a supplement to the quality grading standards for sugar glass equipment and is specifically used for quality evaluation between products of the same grade (such as excellence evaluation) B.1 The product quality grade is determined by the quality grading regulations for Tang glass equipment; B .2 The quality difference between products of the same grade is determined by this method: 3. In order to compare the differences between products of the same grade, this method stipulates the quality evaluation award clause B.4 Award clause
B.4.1 For any advanced process and advanced structure that is better than the current national and industry standards and has been identified or confirmed by the competent leadership department, 1 point will be awarded for each item, such as full-automatic welding, pipe connection hole punching, pipe waist connection and manhole high-diameter flange; B.4.2 According to the quality grade difference and penalty grade difference regulations, one point will be awarded for each increase in grade difference: B.4.3 The award grade difference for temperature resistance is 25℃, that is, one point will be awarded for each increase of 25℃; B.4.4 The award grade difference for flatness is 0.5%DN: one point will be awarded for every 0.5%D increase; B.4.5 The radial full runout award difference of the upper end sealing section of the stirring is stipulated to be 0.1mm, that is, one point will be awarded for every 0.1m increase. B.5 During the evaluation, the ranking is based on the total value of the total points and bonus points. Additional notes:
This standard was proposed by China National Chemical Equipment Corporation, Ministry of Chemical Industry: This standard is under the jurisdiction of the National Technical Committee for Standardization of Glass Equipment. This standard was drafted by the Chemical Machinery Research Institute, Ministry of Chemical Industry. The main drafter of this standard: Liu Liangyue
People's Republic of China
Chemical Industry Standards
Abstract: Glass Equipment Quality Classification
2638--94
Edited by China National Chemical Equipment Corporation
Postal Code: 100011
Printed by Beijing Institute of Chemical Technology Printing Factory
Copyright reserved
880×1230
First Edition: June 1993
No Reprinting
Sheet 0.5
16-859
9,000 Words
First Printing: June 1995
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