HG/T 2734-1995 Technical Specifications for Mechanical Seals for Medium Pressure Reactors HG/T2734-1995 Standard download decompression password: www.bzxz.net

Chemical Industry Standard of the People's Republic of China
HG/T2734--95
Mechanical seal for medium pressure reactor
Technical conditions
Published on July 5, 1995
Ministry of Chemical Industry of the People's Republic of China
Implementation on March 1, 1996
Chemical Industry Standard of the People's Republic of China
Technical conditions for mechanical seal for medium pressure reactor 1 Subject content and scope of application
HG/T 2734-95
This standard specifies the technical requirements, test, installation and use requirements for materials and main parts of mechanical seal for medium pressure reactor. This standard is applicable to the mechanical seal of vertical stirring shaft of medium pressure reactor made of carbon steel and stainless steel. Its working parameters: the pressure of the medium in the reactor is 2.8~6.4MPa (gauge pressure), the mass temperature is not more than 350℃, the diameter of the stirring shaft is 30~100mm; the linear speed is not more than 3m/s. 2 Reference Standards
The provisions contained in the following standards constitute the provisions of this standard through their use in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB1184-80 Shape and position tolerances - Provisions for unspecified tolerances GB1239.2-89 Technical requirements for wax bombs for cold-lifted cylindrical screws GB/T1804-92 General tolerances - Unspecified tolerances for linear dimensions GB3452.1-92 Type 0 rubber seals for hydraulic and pneumatic applications - Dimension series and tolerances HG/T2099-91 Test specification for mechanical seals for use in reactors - Auxiliary devices for mechanical seals for use in reactors
HG/T2122-91
HG2264-92 Types, main dimensions and markings of mechanical seals for use in reactors JB/T7369-94 Definition of test method for flatness of valve surface of mechanical seals
This standard adopts the following definitions:
Medium-pressure reaction kettle refers to the reaction kettle with a medium pressure of 2.6~6.4MPa in the reactor. 4 Technical requirements
4.1 Structural type requirements
4.1.1 Mechanical seals for medium-pressure reactors should use axial double-face structures, and balanced plastic structures should be used on both the medium side and the atmosphere side. 4.1.2 The positioning bearing part of the medium-pressure reactor agitator shaft should be as close to the mechanical seal surface as possible, and the positioning bearing, short shaft, mechanical seal, cooling water jacket, etc. should be combined into a "reactor agitator seal crack". 4.2 Material technical requirements
The types of mechanical seal materials for medium-pressure reactors should comply with the provisions of Article 4.2 of HG2264-92. The friction material should be tungsten carbide, silicon carbide, high-strength graphite, etc. The materials used for rotating rings, stationary rings, auxiliary sealing rings, and springs should have quality certificates. 4.3 Manufacturing technical requirements
4.3.1 Pressure-bearing parts such as sealing chambers should be tested according to the corresponding regulations of pressure vessels, and there should be inspection reports. 4.3.2 The rotating ring, stationary ring, and stationary ring seat should take measures to eliminate processing stress. 4.3.9 The sealing surface of the rotating ring and the stationary ring shall not have any defects such as scratches, pores, depressions, etc. that affect the sealing performance. The surface shall be tested according to JB/T#369-94, and the flatness shall not be greater than 0.9um, and the roughness Ra shall not be greater than 0.20um. The Ministry of Chemical Industry of the People's Republic of China approved the flatness of the sealing surface to be implemented in accordance with HG/T2734-95 on July 5, 1995. 4.3.4 The roughness tolerance of the sealing contact end face of the rotating ring and the stationary ring shall be in accordance with the 5th grade tolerance of Appendix 1. (3) of GB118480. 4.3.5 The roughness scale a of the contact part between the rotating ring, the stationary ring and the auxiliary sealing ring shall not be greater than 1.6um, and the outer or inner hole size tolerance is h8 respectively. or H8.
4.3.6 The verticality of the inner hole where the rotating ring seal end face contacts the rotating ring auxiliary seal and the verticality of the outer circle where the stationary ring seal end face contacts the stationary ring auxiliary seal shall comply with the 6th grade tolerance of Appendix 1. (3) of GB1184-80. 4.4.7 The tolerance values ​​of the spring inner diameter, outer diameter, free height, working pressure, verticality between the spring center line and the two end faces shall comply with the second-order precision requirements of Article 4 of GB1239.2-89.
4.3. 8 The limit deviation of the un-toleranced dimensions of the parts shall comply with f in GB/T1804-92 Grade tolerance. 5 Performance requirements for mechanical seals for medium pressure steam
5.1 Leakage
5.1.1 The method for determining the leakage shall be in accordance with Appendix B.1.2 of HG/T2099-91. When the isolation fluid is oil, it is stipulated that: when the shaft diameter is greater than 80mm, the leakage disc shall not be greater than 10ml/h, and when the shaft diameter is not greater than 80mm, the leakage shall not be greater than 8ml/h. 5.1.2 When the working medium is a non-flammable or explosive gas, the leakage shall refer to the relevant safety regulations. 5.2 Service life
When the installation and use are correct, and the working medium is neutral or weakly corrosive gas or liquid, the service life of the mechanical seal is generally 8000 hours. When the working medium is a strongly corrosive or volatile gas, the service life of the mechanical seal is generally 4000 hours. Special circumstances are not subject to this limit. Test of mechanical seals for medium-pressure reactors
8.1 Mechanical seals for medium-pressure reactors must be subjected to static pressure tests and operation tests before leaving the factory. The specified leakage volume is 5.1. 8.2 The static pressure test pressure is 1.25 of the design pressure. times, the test time lasts for 30m, then the test pressure is reduced to the maximum use pressure and maintained for 6 hours.
. 3 The operating test pressure is the maximum use pressure, and the test time is determined by negotiation between the user and the manufacturer. 6.1 The main contents of the operating test record should include the seal model, specifications, test and installation conditions, isolation fluid inlet temperature and flow rate during the test, seal leakage, bearing accuracy, etc.
7 Installation and use requirements
7.1 During installation Requirements for the shaft (or shaft pull) of the mechanical seal for medium-pressure reactors 1.1.1 The outer diameter of the stirring shaft (or shaft sleeve) made of carbon steel or stainless steel is h9, and the surface roughness is not greater than 1.m. 7.1.2 When the mechanical seal for medium-pressure reactors is a "reaction basin stirring seal device", its technical requirements are shown in Figure 1 and Table 1. Item Content
Radial perturbation
Diameter movement
Axial movement
Straightness
HG/T 2734--95
Measurement location
Stirring pumping diameter
7.2 When the mechanical seal for medium-pressure reactors is working, the auxiliary system shall be configured according to Article 3.4 of HG/T2122-91. The isolation fluid pressure shall be 1.0 ... 0.2~0.5MPa higher than the working pressure in the kettle. 3 When the temperature of the medium in the kettle is higher than 80℃, corresponding cooling measures must be adopted. Marking and packaging bzxz.net
, 1 The packaging box should indicate the product mark, date of manufacture and name of the manufacturer. 8.2 The packaging box should be accompanied by a product certificate and operation test record. 8.3 The manufacturer should provide product installation and use instructions. 3
Complete supply and acceptance regulations
9.1 The manufacturer shall supply complete sets or parts according to the user's requirements. 2754—95
The user has the right to conduct sampling inspection on the products according to the provisions of this standard. 9.2
Additional instructions.
This standard is proposed by China National Chemical Equipment Corporation. This standard is under the jurisdiction of the Chemical Industry Special Seal Standardization Technical Committee of the Ministry of Chemical Industry. This standard is drafted by Beijing University of Chemical Technology and Kunshan Mechanical Seals Factory. The main drafters of this standard are Li Jihe, Wu Jianming and Wu Guogang. 4
2734-95
People's Republic of China
Chemical Industry Standard
Technical Conditions for Mechanical Seals for Medium-Pressure Reactors HG/T 1734-95
Editor: China National Chemical Equipment Corporation
Postal Terminal Code: 100011
Printer: Beijing Chemical Industry Xiaoyin Printing Factory
Copyright reserved
Format: 880×1230
First Edition: October 1995
No Printing Warp
9 Flat Characters
First Printing: October 1995
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