Some standard content:
Industry Standard of the People's Republic of China
HG/T 20677-1990
Rubber lined chemical equipment
1991-02-01
1991-05-01
Ministry of Chemical Industry of the People's Republic of China
Rubber lining materials
Rubber lining design:
Structural design of rubber lined equipment, pipelines and pipe fittingsManufacture, testing and acceptance of metal shell of rubber lined equipment·Rubber lining construction and vulcanization process
Inspection and acceptance··
Packaging, transportation, storage and installation
Appendix A
Appendix B
Appendix C
Appendix D
Appendix E
Appendix F
Appendix G
Appendix H
Rubber lining materials Quality requirements (reference)Chemical stability of rubber (reference)
Vulcanization process (reference)
Structural dimensions of flanges, flange covers and gaskets during body vulcanization (reference)Application examples of rubber lined chemical equipment (reference)Some domestic rubber sheet brands and production units (reference)Vulcanization tank dimensions of some domestic rubber lined equipment manufacturers (reference)·Determination method of 90 degree peel strength of vulcanized rubber and metal (reference)Preparation instructions,
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Industry standards of the People's Republic of China
Rubber lined chemical equipment
HG/T 20677-1990
Editor:
Approval Unit:
Implementation Date:
Qilu Petrochemical Design Institute of Sinopec Corporation Ministry of Chemical Industry of the People's Republic of China
May 1991
National Chemical Engineering Construction Standard Editing Center (formerly the Engineering Construction Standard Editing Center of the Ministry of Chemical Industry) 2001 Beijing
According to the arrangement of the Infrastructure Department of the Ministry of Chemical Industry, the Equipment Design Technology Center of the Ministry of Chemical Industry organized the preparation of "Rubber Lined Single Chemical Equipment" (HG/T20677-1990) as a ministerial directive technical document guiding the design and manufacture of equipment. This standard specifies the design and manufacturing technical requirements for rubber lined chemical equipment. The main text includes: general principles, rubber lining materials, rubber lining design, rubber lining equipment, pipeline and pipe fittings structural design, rubber lining equipment metal shell manufacturing, testing and acceptance, rubber lining construction and vulcanization process, inspection and acceptance, packaging, transportation, storage and installation, and 8 appendices and compilation instructions. This standard is edited by Luo Futian of Qilu Petrochemical Design Institute of Sinopec Corporation, verified by Liu Yiyi, reviewed by Pan Dexiao, and Jia Huimin participated in part of the work.
This standard is revised on the basis of CD130A15-85 and CD130A16~85 standards issued by the former Infrastructure Bureau of the Ministry of Chemical Industry.
This standard has been finalized after soliciting opinions, review by special personnel and review by the Equipment Center Station, and submitted to the Ministry for approval by the Equipment Design Technology Center Station of the Ministry of Chemical Industry.
In the process of implementing this standard, if you find that there is a need for modification or supplementation, please provide your opinions and relevant information to the Equipment Design Technology Center Station of the Ministry of Chemical Industry for reference in future revisions. Equipment Design Technology Center of the Ministry of Chemical Industry
December 1990
1 General
1.1 Scope of application
1.1.1 This standard applies to rubber linings of chemical equipment, pipes and fittings made of steel and cast iron to resist corrosion by chemical media or abrasion by solid particles: it also applies to the rubber lining parts of composite lining equipment with rubber as a separation layer.
1.1.2 This standard does not include equipment that is brushed or sprayed with liquid rubber layers. 1.1.3 This standard does not apply to equipment with jackets heated by steam and pipes and fittings with threaded connections. 1.2 Working temperature and working pressure of rubber-lined equipment 1.2.1 Working temperature range
(1) The allowable working temperature of hard rubber sheets is 0 to +85°C. When the vacuum degree is less than or equal to 0.08MPa, the maximum working temperature is +65°C; when the vacuum degree is greater than 0.08MPa but less than 0.093MPa, the maximum working temperature is +40°C. (2) The allowable working temperature of semi-hard rubber sheets and soft rubber sheets is -25 to +75°C. (3) The allowable working temperature of synthetic rubber sheets can be determined based on the heat resistance stability in the product manual and the actual measured temperature of the sample.
(4) The allowable working temperature of special rubber sheets should be determined according to the technical conditions formulated by the manufacturer and the research and development unit. 1.2.2 Working pressure range
The nominal pressure is less than or equal to 0.6MPa (gauge pressure). 1.3 Reference standards
In addition to complying with this standard, the following standards and technical conditions shall also be met: GB150 "Steel Pressure Vessels"
CD130A2 "Technical Specifications for the Design of Vertical Cylindrical Steel Welded Storage Tanks" JB2880 "Technical Conditions for Steel Welded Pressure Vessels" HGJ33-91 "Design Specifications for Lined Steel Shells" 3GB5575 "Unvulcanized Rubber Sheets for Lining Chemical Equipment" GB8923 "Rust Level and Rust Removal Level of Steel Surfaces Before Painting". 2 Rubber lining materials
2.1 Quality requirements for rubber sheets
2.1.1 The quality of the rubber sheets vulcanized in the kettle and the body vulcanized shall comply with the provisions of GB5575 "Unvulcanized Rubber Sheets for Lining Chemical Equipment".
2.1.2 The quality of the naturally vulcanized rubber sheets shall refer to the requirements of Table A-1 in Appendix A. B.
The quality of pre-vulcanized rubber sheet shall refer to the requirements of Table A-2 in Appendix A. 2.1.4 The quality of normal pressure hot water vulcanized rubber sheet shall refer to the requirements of Table A-3 in Appendix A. 2.1.5
The quality of normal pressure steam vulcanized rubber sheet shall refer to the requirements of Table A-4 in Appendix A. The chemical stability of rubber sheet (vulcanized rubber) used for rubber lining equipment, pipelines and pipe fittings can refer to Appendix 2.1.6
2.1.7 The raw materials used for lining must have a quality certificate. The certificate should have the factory date (year, month, day) of the rubber sheet and the film used for preparing the glue. If the data on the certificate is incomplete or the manufacturing department deems it necessary, a re-inspection should be carried out. 2.1.8 Rubber sheet for lining shall not be used for rubber sheet with self-vulcanization phenomenon. The storage time of rubber sheet shall be in accordance with the provisions of the rubber sheet manufacturer.
2.1.9 The surface of rubber sheet for lining is not allowed to have oil contaminants. 2.1.10 In addition to complying with 2.1.1 to 2.1.5, the following requirements shall also be met when preparing the film for the adhesive: (1) The grade of the film for the adhesive must be compatible with the grade of the rubber sheet for the lining. The film for the adhesive and the rubber sheet for the lining should be products of the same manufacturer.
(2) The film for the adhesive should be completely dissolved in the solvent, and no agglomeration, precipitation or tumbling should occur. (3) The prepared adhesive should be a viscous liquid and should not be in a gel state during storage. 2.1.11 For the rubber sheets and adhesive liquids that need to be transported and stored at low temperatures, refrigerated containers should be used during transportation and construction. The transportation and storage conditions shall comply with the requirements of the rubber sheet and adhesive liquid manufacturers, and the refrigeration temperature shall be recorded. 2.2 Quality requirements for rubber solvent oil
Rubber solvent oil shall comply with the provisions of GB1922 solvent oil. 2.3 Quality requirements of petroleum toluene
The quality requirements of petroleum toluene shall comply with the provisions of GB3406 "Petroleum toluene". 3 Rubber lining design
3.1 Selection of rubber lining layer
3.1.1 The rubber lining layer shall mainly consider the following factors: (1) The nature of the medium (including medium with small or trace components). (2) Working temperature Normal working temperature Maximum or minimum temperature, temperature change cycle. (3) Working pressure Normal working pressure: maximum or minimum pressure, pressure change cycle. (4) Operation cycle Intermittent or continuous operation. (5) Wear and erosion Suspended matter quantity, particle size, physical properties and flow rate. (6) Cleaning operation requirements.
(7) Mechanical damage Damage caused during equipment transportation and installation, or vibration and other mechanical damage of the equipment.
(8) Special requirements such as special climatic conditions encountered during equipment transportation and storage. 3.1.2 The rubber lining layer is generally 1 to 2 layers. The thickness of each layer is 2-3mm, and the total thickness is 2-6mm. Under special requirements, 3 layers can be applied, but the total thickness should not exceed 8mm. 2
3.1.3 For lining equipment and pipelines with highly corrosive media, small temperature changes, and no mechanical vibration, 1-2 layers of hard rubber or semi-hard rubber sheets should be applied.
3.1.4 When the corrosiveness of the medium is weak and the temperature is low, soft rubber sheets can be applied alone. 3.1.5 When the medium is a severely corrosive gas, in order to avoid gas penetration, two layers of hard rubber sheets must be used, with a total thickness of 4-6mm.
3.1.6 If the medium contains suspended solids and wear resistance is required, a layer of hard rubber sheet should be used as the bottom layer and a layer of soft rubber sheet as the surface layer.
3.1.7 For rubber lining equipment installed outdoors, if the hard rubber sheet is likely to crack due to freezing, it is generally advisable to use a hard rubber sheet as the bottom layer and a soft rubber sheet as the surface layer, or to use two layers of semi-hard rubber sheets as the lining layer. 3.1.8 Soft rubber sheets should not be used as the bottom layer of the rubber lining for vacuum equipment. 3.1.9 For large tanks, soft rubber sheets should be used as the lining layer, or hard rubber sheets should be used as the bottom layer and soft rubber sheets as the surface layer.
For rubber lining components that require mechanical cutting: hard rubber sheets should be used as the lining layer. 3.1.10
3.1.11 For rotating parts, 1 to 2 layers of semi-hard rubber sheets can be used as the lining layer. When there is wear, a hard and soft rubber composite lining can also be used. The thickness and number of layers of soft rubber depend on the wear condition. 3.1.12 Two rubber sheets with different vulcanization conditions are not allowed to be used as lining layers on the same equipment, pipeline and pipe fittings.
3.2 Selection of vulcanization method
3.2.1· The vulcanization method of rubber lined equipment should be selected according to the shape, size, operating pressure and vulcanization conditions of different types of rubber.
3.2.2 Principles for selecting vulcanization method
(1) For rubber lined equipment that can enter the vulcanizer: the vulcanization method in the vulcanizer should be considered first, and constant pressure vulcanization should be adopted to ensure the quality of the rubber lining. (2) For rubber lined equipment with large volume that cannot enter the vulcanizer: when the design pressure of the metal shell is greater than or equal to 0.3MPa, the body vulcanization method can be selected. (3) For large rubber lined equipment that cannot be vulcanized by the above two methods, naturally vulcanized rubber sheets, pre-vulcanized rubber sheets, normal pressure hot water vulcanized rubber sheets and normal pressure steam vulcanized rubber sheets can be used. 4 Structural design of rubber-lined equipment, pipelines and fittings 4.1 Metal shell of rubber-lined equipment
In addition to complying with the relevant provisions of the standards for steel containers and the "Design Regulations for Lined Steel Shells" (HGJ33-91), the metal shell of rubber-lined equipment shall also comply with the following provisions. 4.1.1 Rubber-lined equipment must have sufficient rigidity. When lined with hard rubber, the angular deformation shall comply with the provisions of Table 4-1. When lined with other rubbers, the rigidity of the equipment can be determined by the designer according to requirements. 4.1.2 Riveted structures shall not be used in rubber-lined equipment. 4.1.3 The structural design of the metal shell of rubber-lined equipment should be simple. The rubber-lined area must ensure that hands or tools can be operated smoothly during the rubber lining construction. 3
Table 4-1
Angle enlargement or reduction
Cross-sectional angle of deflection of surface or curved surface
Allowance of hard rubber lining weight
Sulfonated rubber
4.1.4 The inner surface of the metal shell of rubber lined equipment shall be flat and smooth. All corners shall be rounded. The radius of the inner corner shall not be less than 5mm, and the radius of the outer corner shall not be less than 3mm (see Figure 4-1). (a)
Figure 4-1
4.1.5 The reinforcement parts of the metal shell of rubber lined equipment shall be designed on the side without rubber lining (see Figure 4-2). Strong partswwW.bzxz.Net
Figure 4-2
(6)Not good
4.1.6 All parts and components welded to the metal shell of rubber lined equipment must be welded before the rubber lining construction, and no welding is allowed after the rubber lining.
4.1.7 Length of metal shell of rubber lined equipment For equipment with a shell diameter of less than or equal to 700mm, the height (or length) of rubber lined equipment shall not exceed 700mm. When the height (or length) exceeds 700mm, flange connection structure shall be adopted in sections. 4.1.8 Setting of manholes for rubber lined equipment
When the shell of rubber lined equipment does not have a detachable head structure, manholes must be set. The size and number of manholes shall be determined according to the size of the equipment volume (see Table 4-2) to facilitate good ventilation and ensure construction safety. Manhole setting
Qiu 4-2
Equipment volume
50≤V100
100V600
V≥600
Manhole diameter
4.1,9External components of rubber lined equipment
Installation position and quantity
（1）Manhole, hand hole, pipe connection of rubber lined equipment, as shown.
Manhole diameter
Installation position and quantity
Cylinder or head
Generally, it shall not protrude from the inner surface of the equipment. Its structure is shown in Figure 4-3(6)
Figure 4-3
（2）When the pipe connection of rubber lined equipment needs to extend into the interior of the equipment, its structure is shown in Figure 4-4. If the extended part is short (does not affect the equipment lining rubber construction operation), the pipe can be directly welded to the shell, and the five values should comply with Table 4-3, see Figure 4-4 (a).
Table 4-3
Nominal diameter of pipe DN
Figure 4-4
Extended length
When the extended part is long (affects the equipment lining rubber construction operation) or requires a detachable structure, the pipe should be designed as a structure in which the electric flange is connected to the pipe on the shell, as shown in Figure 4-4 (6). 4.1.10 Internal components of rubber lined equipment (1) The parts in the rubber lined equipment (spray pipe, distribution plate, perforated plate, etc.) should be designed as flange connection structure and flange clamping structure as shown in Figure 4-5 as much as possible to facilitate maintenance and replacement. These parts should be made of anti-corrosion materials that do not require rubber lining as much as possible. Huang Pai
Figure 4-5
(2) When a steam pipe heater made of stainless steel, titanium or other anti-corrosion materials is installed inside the rubber lined equipment, in order to avoid the rubber lining from overheating and damaging the delamination, the distance between the outer surface of the steam pipe and the surface of the rubber lining shall generally not be less than 100mm. When the heating pipe enters the equipment through the pipe, the above distance can be appropriately reduced as long as the temperature of the pipe passing through the pipe does not exceed 80°C. However, in any case, this distance should not be less than 25mm, as shown in Figure 4-6. Yanqi
Figure 4-6
When steam is directly introduced for heating, the steam shall not directly impact the surface of the rubber lining. (3) When the head of the rubber lined equipment is elliptical, dish-shaped, conical, etc., the convex surface is generally on the outside (the side without the rubber lining) and the concave surface is on the inside; if there are special requirements, it should be designed as the structure of Figure 4-7 (a), and the structure of Figure 4-7 (b) should not be adopted.
（4）When the rubber-lined equipment with agitator has a flat bottom and a flat cover, it can be designed with a structure with a reinforcing cone as shown in Figure 4-8.
Transition cone
Vent hole
On-site tapping
(6)Not good
(a)Good
Figure 4-7
The welding surface is smoothed by grinding wheel
On-site tapping
Figure 4-8
（5）The internal support ring structure of the rubber-lined equipment is shown in Figure 4-9. Reinforced chain1 Metal Shell of Rubber-lined Equipment
In addition to complying with the relevant provisions of the standards for steel containers and the "Design Regulations for Lined Steel Shells" (HGJ33-91), the metal shell of rubber-lined equipment shall also comply with the following provisions. 4.1.1 Rubber-lined equipment must have sufficient rigidity. When lined with hard rubber, the angular deformation shall comply with the provisions of Table 4-1. When lined with other rubbers, the rigidity of the equipment can be determined by the designer according to requirements. 4.1.2 Riveted structures shall not be used in rubber-lined equipment. 4.1.3 The structural design of the metal shell of rubber-lined equipment should be simple. The rubber-lined area must ensure that hands or tools can be operated smoothly during the rubber lining construction. 3
Table 4-1
Angle enlargement or reduction
Cross-sectional angle of deflection of surface or curved surface
Allowance of hard rubber lining weight
Sulfonated rubber
4.1.4 The inner surface of the metal shell of rubber lined equipment shall be flat and smooth. All corners shall be rounded. The radius of the inner corner shall not be less than 5mm, and the radius of the outer corner shall not be less than 3mm (see Figure 4-1). (a)
Figure 4-1
4.1.5 The reinforcement parts of the metal shell of rubber lined equipment shall be designed on the side without rubber lining (see Figure 4-2). Strong parts
Figure 4-2
(6)Not good
4.1.6 All parts and components welded to the metal shell of rubber lined equipment must be welded before the rubber lining construction, and no welding is allowed after the rubber lining.
4.1.7 Length of metal shell of rubber lined equipment For equipment with a shell diameter of less than or equal to 700mm, the height (or length) of rubber lined equipment shall not exceed 700mm. When the height (or length) exceeds 700mm, flange connection structure shall be adopted in sections. 4.1.8 Setting of manholes for rubber lined equipment
When the shell of lined equipment does not have a detachable head structure, manholes must be set. The size and number of manholes shall be determined according to the size of the equipment volume (see Table 4-2) to facilitate good ventilation and ensure construction safety. Manhole setting
Qiu 4-2
Equipment volume
50≤V100
100V600
V≥600
Manhole diameter
4.1,9External components of rubber lined equipment
Installation position and quantity
（1）Manhole, hand hole, pipe connection of rubber lined equipment, as shown.
Manhole diameter
Installation position and quantity
Cylinder or head
Generally, it shall not protrude from the inner surface of the equipment. Its structure is shown in Figure 4-3(6)
Figure 4-3
（2）When the pipe connection of rubber lined equipment needs to extend into the interior of the equipment, its structure is shown in Figure 4-4. If the extended part is short (does not affect the equipment lining rubber construction operation), the pipe can be directly welded to the shell, and the five values should comply with Table 4-3, see Figure 4-4 (a).
Table 4-3
Nominal diameter of pipe DN
Figure 4-4
Extended length
When the extended part is long (affects the equipment lining rubber construction operation) or requires a detachable structure, the pipe should be designed as a structure in which the electric flange is connected to the pipe on the shell, as shown in Figure 4-4 (6). 4.1.10 Internal components of rubber lined equipment (1) The parts in the rubber lined equipment (spray pipe, distribution plate, perforated plate, etc.) should be designed as flange connection structure and flange clamping structure as shown in Figure 4-5 as much as possible to facilitate maintenance and replacement. These parts should be made of anti-corrosion materials that do not require rubber lining as much as possible. Huang Pai
Figure 4-5
(2) When a steam pipe heater made of stainless steel, titanium or other anti-corrosion materials is installed inside the rubber lined equipment, in order to avoid the rubber lining from overheating and damaging the delamination, the distance between the outer surface of the steam pipe and the surface of the rubber lining shall generally not be less than 100mm. When the heating pipe enters the equipment through the pipe, the above distance can be appropriately reduced as long as the temperature of the pipe passing through the pipe does not exceed 80°C. However, in any case, this distance should not be less than 25mm, as shown in Figure 4-6. Yanqi
Figure 4-6
When steam is directly introduced for heating, the steam shall not directly impact the surface of the rubber lining. (3) When the head of the rubber lined equipment is elliptical, dish-shaped, conical, etc., the convex surface is generally on the outside (the side without the rubber lining) and the concave surface is on the inside; if there are special requirements, it should be designed as the structure of Figure 4-7 (a), and the structure of Figure 4-7 (b) should not be adopted.
（4）When the rubber-lined equipment with agitator has a flat bottom and a flat cover, it can be designed with a structure with a reinforcing cone as shown in Figure 4-8.
Transition cone
Vent hole
On-site tapping
(6)Not good
(a)Good
Figure 4-7
The welding surface is smoothed by grinding wheel
On-site tapping
Figure 4-8
（5）The internal support ring structure of the rubber-lined equipment is shown in Figure 4-9. Reinforced chain1 Metal Shell of Rubber-lined Equipment
In addition to complying with the relevant provisions of the standards for steel containers and the "Design Regulations for Lined Steel Shells" (HGJ33-91), the metal shell of rubber-lined equipment shall also comply with the following provisions. 4.1.1 Rubber-lined equipment must have sufficient rigidity. When lined with hard rubber, the angular deformation shall comply with the provisions of Table 4-1. When lined with other rubbers, the rigidity of the equipment can be determined by the designer according to requirements. 4.1.2 Riveted structures shall not be used in rubber-lined equipment. 4.1.3 The structural design of the metal shell of rubber-lined equipment should be simple. The rubber-lined area must ensure that hands or tools can be operated smoothly during the rubber lining construction. 3
Table 4-1
Angle enlargement or reduction
Cross-sectional angle of deflection of surface or curved surface
Allowance of hard rubber lining weight
Sulfonated rubber
4.1.4 The inner surface of the metal shell of rubber lined equipment shall be flat and smooth. All corners shall be rounded. The radius of the inner corner shall not be less than 5mm, and the radius of the outer corner shall not be less than 3mm (see Figure 4-1). (a)
Figure 4-1
4.1.5 The reinforcement parts of the metal shell of rubber lined equipment shall be designed on the side without rubber lining (see Figure 4-2). Strong parts
Figure 4-2
(6)Not good
4.1.6 All parts and components welded to the metal shell of rubber lined equipment must be welded before the rubber lining construction, and no welding is allowed after the rubber lining.
4.1.7 Length of metal shell of rubber lined equipment For equipment with a shell diameter of less than or equal to 700mm, the height (or length) of rubber lined equipment shall not exceed 700mm. When the height (or length) exceeds 700mm, flange connection structure shall be adopted in sections. 4.1.8 Setting of manholes for rubber lined equipment
When the shell of rubber lined equipment does not have a detachable head structure, manholes must be set. The size and number of manholes shall be determined according to the size of the equipment volume (see Table 4-2) to facilitate good ventilation and ensure construction safety. Manhole setting
Qiu 4-2
Equipment volume
50≤V100
100V600
V≥600
Manhole diameter
4.1,9External components of rubber lined equipment
Installation position and quantity
（1）Manhole, hand hole, pipe connection of rubber lined equipment, as shown.
Manhole diameter
Installation position and quantity
Cylinder or head
Generally, it shall not protrude from the inner surface of the equipment. Its structure is shown in Figure 4-3(6)
Figure 4-3
（2）When the pipe connection of rubber lined equipment needs to extend into the interior of the equipment, its structure is shown in Figure 4-4. If the extended part is short (does not affect the equipment lining rubber construction operation), the pipe can be directly welded to the shell, and the five values should comply with Table 4-3, see Figure 4-4 (a).
Table 4-3
Nominal diameter of pipe DN
Figure 4-4
Extended length
When the extended part is long (affects the equipment lining rubber construction operation) or requires a detachable structure, the pipe should be designed as a structure in which the electric flange is connected to the pipe on the shell, as shown in Figure 4-4 (6). 4.1.10 Internal components of rubber lined equipment (1) The parts in the rubber lined equipment (spray pipe, distribution plate, perforated plate, etc.) should be designed as flange connection structure and flange clamping structure as shown in Figure 4-5 as much as possible to facilitate maintenance and replacement. These parts should be made of anti-corrosion materials that do not require rubber lining as much as possible. Huang Pai
Figure 4-5
(2) When a steam pipe heater made of stainless steel, titanium or other anti-corrosion materials is installed inside the rubber lined equipment, in order to avoid the rubber lining from overheating and damaging the delamination, the distance between the outer surface of the steam pipe and the surface of the rubber lining shall generally not be less than 100mm. When the heating pipe enters the equipment through the pipe, the above distance can be appropriately reduced as long as the temperature of the pipe passing through the pipe does not exceed 80°C. However, in any case, this distance should not be less than 25mm, as shown in Figure 4-6. Yanqi
Figure 4-6
When steam is directly introduced for heating, the steam shall not directly impact the surface of the rubber lining. (3) When the head of the rubber lined equipment is elliptical, dish-shaped, conical, etc., the convex surface is generally on the outside (the side without the rubber lining) and the concave surface is on the inside; if there are special requirements, it should be designed as the structure of Figure 4-7 (a), and the structure of Figure 4-7 (b) should not be adopted.
（4）When the rubber-lined equipment with agitator has a flat bottom and a flat cover, it can be designed with a structure with a reinforcing cone as shown in Figure 4-8.
Transition cone
Vent hole
On-site tapping
(6)Not good
(a)Good
Figure 4-7
The welding surface is smoothed by grinding wheel
On-site tapping
Figure 4-8
（5）The internal support ring structure of the rubber-lined equipment is shown in Figure 4-9. Reinforced chain10 Internal components of rubber lined equipment (1) The parts (spray pipes, distribution plates, perforated plates, etc.) in rubber lined equipment should be designed as far as possible with flange connection structures and flange clamping structures as shown in Figure 4-5 to facilitate maintenance and replacement. These parts should be made of anti-corrosion materials that do not require rubber lining as far as possible. Huang Pai
Figure 4-5
(2) When a steam pipe heater made of stainless steel, titanium or other anti-corrosion materials is installed inside the rubber lined equipment, in order to avoid overheating of the rubber lining and damage and delamination, the distance between the outer surface of the steam pipe and the surface of the rubber lining shall generally not be less than 100mm. When the heating pipe enters the equipment through the pipe, the above distance can be appropriately reduced as long as the temperature of the pipe passing through the pipe does not exceed 80°C. However, in any case, this distance should not be less than 25mm, as shown in Figure 4-6. Yan Qi
Figure 4-6
When steam is directly introduced for heating, the steam shall not directly impact the surface of the rubber lining. (3) When the head of the rubber lined equipment is in the shape of an ellipse, dish, cone, etc., the convex surface is generally on the outside (the side without rubber lining) and the concave surface is on the inside; if there are special requirements, it should be designed as the structure of Figure 4-7 (a), and the structure of Figure 4-7 (b) should not be adopted.
(4) When the rubber lined equipment with an agitator has a flat bottom and a flat cover, it can be designed as a structure with a reinforced cone as shown in Figure 4-8.
Transition cone
Vent hole
On-site tapping
(6)Not good
(a)Good
Figure 4-7
The welding surface is smoothed with a grinding wheel
On-site rose
Figure 4-8
(5) The structure of the inner support ring of the rubber lined equipment is shown in Figure 4-9. Reinforced chain10 Internal components of rubber lined equipment (1) The parts (spray pipes, distribution plates, perforated plates, etc.) in rubber lined equipment should be designed as far as possible with flange connection structures and flange clamping structures as shown in Figure 4-5 to facilitate maintenance and replacement. These parts should be made of anti-corrosion materials that do not require rubber lining as far as possible. Huang Pai
Figure 4-5
(2) When a steam pipe heater made of stainless steel, titanium or other anti-corrosion materials is installed inside the rubber lined equipment, in order to avoid overheating of the rubber lining and damage and delamination, the distance between the outer surface of the steam pipe and the surface of the rubber lining shall generally not be less than 100mm. When the heating pipe enters the equipment through the pipe, the above distance can be appropriately reduced as long as the temperature of the pipe passing through the pipe does not exceed 80°C. However, in any case, this distance should not be less than 25mm, as shown in Figure 4-6. Yan Qi
Figure 4-6
When steam is directly introduced for heating, the steam shall not directly impact the surface of the rubber lining. (3) When the head of the rubber lined equipment is in the shape of an ellipse, dish, cone, etc., the convex surface is generally on the outside (the side without rubber lining) and the concave surface is on the inside; if there are special requirements, it should be designed as the structure of Figure 4-7 (a), and the structure of Figure 4-7 (b) should not be adopted.
(4) When the rubber lined equipment with an agitator has a flat bottom and a flat cover, it can be designed as a structure with a reinforced cone as shown in Figure 4-8.
Transition cone
Vent hole
On-site tapping
(6)Not good
(a)Good
Figure 4-7
The welding surface is smoothed with a grinding wheel
On-site rose
Figure 4-8
(5) The structure of the inner support ring of the rubber lined equipment is shown in Figure 4-9. Reinforced chain
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