HG/T 2045-1991 Quality classification of mechanical seals for kettles HG/T2045-1991 standard download decompression password: www.bzxz.net

Chemical Industry Standard of the People's Republic of China
HG/T2045--91
Quality Grading of Mechanical Seals for Kettles
Published on July 6, 1991
Ministry of Chemical Industry of the People's Republic of China
Implementation on January 1, 1992
Chemical Industry Standard of the People's Republic of ChinaWww.bzxZ.net
Quality Grading of Mechanical Seals for Kettles
1 Subject Content and Scope of Application
HG/T2045--91
This standard specifies the quality grade indicators, inspection and sampling methods for mechanical seals for kettles. This standard applies to the stirring shafts of carbon steel and stainless steel reaction skewers and similar vertical stirring shaft mechanical seals. Its working parameters are as follows: the medium pressure in the sealing chamber is 1.33×10-5 (absolute pressure) ~ 2.5MPa (gauge pressure); the medium temperature in the sealing chamber is 0 ~ 80℃; the outer diameter of the stirring shaft (or sleeve) is 30 ~ 130mm; the rotation speed is not more than 500r/min; the medium is various fluids except strong oxidizing acids and high-concentration alkalis. 2 Reference standards
GB1184 Shape and position tolerances Provisions for unmarked tolerances GB1239.2 Technical conditions for cold-rolled cylindrical helical compression springs GB3452.1 Dimension series and tolerances of O-rings for hydraulic and pneumatic applications HG2098 Series and main parameters of mechanical seals for use with stamps Test specifications for mechanical seals for stamps
HG2099
Technical conditions for mechanical seals for kettles
HG2269
3 Classification of quality characteristics by importance
Quality characteristics are divided into three categories according to the principles of Table 1: key quality characteristics (Category A), main quality characteristics (Category B), and general quality characteristics (Category C). For specific classification, see Appendix A.
Category of quality characteristics
4 Assessment of product quality grade
Category code
Classification principle
Quality characteristics that seriously affect performance and life Quality characteristics that affect service life
Those that are not key or main quality characteristics
Degree of influence
4.1 Product quality grades are divided into three levels: superior product, first-class product and qualified product. 4.2 Products shall be disassembled and inspected in accordance with Appendix A. Grade indicators are determined according to the provisions of Table 2, Table 3, Table 4 (quality characteristics are all Class A), Table 5, and the product quality grade is determined by the lowest grade indicators achieved by the product. Approved by the Ministry of Chemical Industry of the People's Republic of China on July 6, 1991 and implemented on January 1, 1992
Shaft or sleeve diameter 20~80mm
Shaft or sleeve diameter>80130mm
Seal ring
Medium characteristics
Medium and weak corrosion
Strong corrosion or volatile
HG/T204591
Leakage index
Wear index
Table 4 Life index
Note: Life index refers to the service life of mechanical seals. Based on the recent evaluation of no less than one major user. Table 5 Disassembly test corresponding grade items pass rate Excellent
Key items
Main items
General items
mm/100h
Content of unqualified items should
Not affect product performance
After the quality grade of the product is determined, the product quality grade assessment certificate should be filled in. Its content and format are shown in Appendix B (reference). 4.3
5 Inspection method
5.1 Static pressure test and operation test are in accordance with the provisions of HG2099. 5.2 Parts inspection shall be carried out in accordance with the methods specified in relevant standards. 6 Sampling
When sampling, the number of product batches shall be as specified in Table 6. However, this limit shall not apply when sampling among users or conducting surprise inspections. 6.1
Single-end mechanical seal
Double-end mechanical seal
Number of products in a batch
6.2 The number of product samples shall be as specified in Table 7.
Test items
Disassembly inspection
Static pressure test, 6 Operation test
100h operation test
HG/T2045-91
Number of product samples
Single-end mechanical seal||t t||Product spot check
Product review
6.3 When the number of product batches is less than the number of samples, all products should be tested. Product excellence
Product identification
Double-end mechanical seal
Product spot check
Product review
Product excellence
Product identification
Testing items
Hard sealing ring
Soft sealing ring
Stationary ring and its assembly
Rotating ring and its assembly
Inlaid ring and ring seat
Stone ring, filled with mulberry tetrafluoroethylene
HG/T2045-—91
Appendix A
Testing items and requirements for disassembly of each set of products
(Supplement)
Testing Content
Superior products
Flatness of sealing end face, mm
Surface roughness of sealing end face, Ra/um
Flatness of sealing end face, mm (except polytetrafluoroethylene ring)
Surface roughness of sealing end face, Ra/um
Free height of single spring
Perpendicularity of both ends of a single spring to the center lineWorking load of spring (one spring can be selected at random for measurement)
Height difference in each set of multi-spring products
Parallelism of sealing end face to the contact end face of auxiliary seal
Surface roughness of the contact part between sealing end face and auxiliary seal, Ra/μm
Dimensional tolerance of outer circle or inner hole of the contact part between sealing end face and auxiliary seal
Sealing Parallelism of sealing end face to contact end face of auxiliary seal
Surface roughness of contact part between sealing end face and auxiliary seal, Ra/um
Dimensional tolerance of outer circle or inner hole of contact part between sealing end face and auxiliary seal
Matching dimension with ring seat before embedding (spot check in semi-finished product warehouse during manufacturer inspection)Static pressure test
Technical requirements
First-class products
≤0.0006
≤0.0006
≤0.0006
Qualified products
≤0.0009
According to the provisions of GB1239 and HG2269, other shapes of springs shall be in accordance with the requirements of drawings
According to GB11847 grade
h (H8)
According to GB11847 grade
h8(H8)
According to the requirements of the drawings
According to the provisions of HG2269, no leakage
Test items
PTFE bellows
PTFE sealing diagram
Rubber for stationary ring and rotating ring
Seal ring
Transmission seat or spring seat
HG/T2045-—91
Test contents
Static pressure test
Material characteristics and dimensional tolerances of auxiliary seals for stationary rings (rotating rings), etc.| |tt||O-type rubber seal material properties (hardness, elongation, corrosion resistance, etc.)
O-type rubber seal circular cross-section diameter
O-type rubber seal inner diameter
Inner hole size tolerance for matching with shaft or sleeve Inner hole surface roughness for matching with shaft or sleeve, Ra/μm
Residual traces and debris between processes
Superior products
Technical requirements
First-class products
Qualified products
According to HG2269 regulations, no leakage, rupture or obvious deformation
According to drawing requirements
According to GB3452.1 Provisions
According to HG2269
Manufacturer name
Product name
Product number
Factory number
Completion date
Product quality
Evaluation results
Name of inspection unit
Head of inspection team:
(Opinion and signature)
Approval unit:
(Opinion and signature)
Additional instructions:
HG/T2045—91
Appendix B
Product quality grade evaluation certificate
(Reference)
Product model
Product drawing number
Head of inspection unit:
(Opinion and signature)
This standard is proposed by China National Chemical Equipment Corporation. This standard is under the jurisdiction of the Chemical Industry Ministry's Chemical Industry Special Seals Standardization Technical Committee. This standard was drafted by the Chemical Industry Machinery Research Institute of the Chemical Industry Ministry, and the main drafters of this standard were Liu Qinglong and Liang Haibo. Month
People's Republic of China
Chemical Industry Standard
Quality Classification of Mechanical Seals for Kettles
HG/T2045-91
Editor Chemical Industry Standard Editorial Department
(Standardization Research Institute of the Ministry of Chemical Industry)
Ministry Code: 100013
Printing Chemical Industry Ministry's Standardization Research Institute
Copyright reserved, no reproduction allowed
Format 880×12301/16 Printing Sheet Word Count 11000 First Edition May 1993 First Printing May 1993 Printing Count 1-1000
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