HG/T 2640-1994 Technical conditions for the construction of glass flake lining HG/T2640-1994 standard download decompression password: www.bzxz.net

Chemical Industry Standard of the People's Republic of China
HG/T2640-94
Technical Conditions for Construction of Glass Flake Lining
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
Technical Conditions for Construction of Glass Flake Lining
1 Subject content and scope of application
HG/T2640-94
This standard specifies the technical requirements for the construction of artificially applied glass flake lining and the methods of inspection and acceptance. This standard is applicable to the construction and acceptance of glass flake lining of steel equipment. The glass flake lining of equipment made of other materials can be implemented in accordance with this standard.
2 Reference standards
GB 8237 Liquid unsaturated polyester resin for glass fiber reinforced plastic (FRP) GB50212 Specification for construction and acceptance of building anti-corrosion projects HGJ229 Specification for construction and acceptance of industrial equipment and pipeline anti-corrosion projects HG2-741 E-type epoxy resin
HG/T2641 Medium-alkali glass flake
3 Terms
3.1 Glass flake lining: The anti-corrosion lining layer formed on the surface of the equipment by preparing glass flakes and resin as the main materials and constructing according to the specified process (hereinafter referred to as flake lining).
3.2 Premix: Glass flake resin anti-corrosion lining material prepared according to the specified formula but not yet added with pigment-containing curing agent. 3.3 Construction material: Flake cement premix is ​​used as the lining material for construction after adding pigment-containing curing agent. 4 Technical requirements
4.1 Construction substrate
4.1.1 The surface treatment of steel equipment and parts to be lined must comply with the relevant provisions of HGJ229. 4.1.2 The surface treatment of reinforced concrete or stone equipment and parts to be lined must comply with the relevant provisions of GB50212. 4.2 Construction environment and safety requirements
4.2.1 The construction environment temperature should be between 15 and 30 °C, and the surface temperature of the construction substrate should be 3 °C higher than the dew point temperature. The relative humidity of the environment should not be greater than 80%.
4.2.2 The construction site must have good ventilation conditions. 4.2.3 Open flames shall not be used at the construction site.
4.2.4 Outdoor construction should be equipped with wind and rainproof facilities, and the scaffolding or hanger used for construction should be firm and stable. Try to avoid contact with the surface to be lined to facilitate lining construction. 4.2.5
4.2.6 Safety and labor protection in flake lining construction must comply with the provisions of relevant national standards. 4.3 Construction materials
4.3.1 Glass flakes
4.3.1.1 Glass flake materials should comply with HG/T2641 and have product certificates. 4.3.1.2 Glass flakes used in preparing flake lining mortar must not be damp or contaminated. Approved by the Ministry of Chemical Industry of the People's Republic of China on October 26, 1994 and implemented on March 1, 1995
4.3.2 Resins
HG/T2640-94
4.3.2.1 The resin used in preparing flake lining mortar should be corrosion-resistant epoxy resin or unsaturated polyester resin. Other resins can refer to this standard.
4.3.2.2 The performance of the resin used to prepare the flaked lining glue shall comply with the provisions of HG2-741 and GB8237, must have a product certificate, and should be within the effective use period.
4.3.3 Curing agent
4.3.3.1 The curing agent used to prepare the flaked lining glue must match the selected resin. 4.3.3.2 The curing agent should have a product certificate and should be within the effective use period. Its product performance should comply with the provisions of the relevant standards. 4.3.4 Local reinforcement materials should be non-paraffin emulsion type medium alkali or alkali-free glass cloth with a thickness of 0.15~0.2mm. 4.3.5 Primer and topcoat
4.3.5.1 Primer should be prepared with E44 epoxy resin in HG2-741. 4.3.5.2 Topcoat should be prepared with the same resin as the flake lining mastic. 4.4
Construction machinery and testing instruments
Vacuum mixer: The vacuum degree should not be less than 0.08MPa, and the speed should be less than 56r/min. 4.4.1
Electric spark pinhole detector: The detection voltage range is 2000~7000V. The instrument accuracy is ±10%. 4.4.2
Thickness gauge: thickness range 0.3~4.0mm, instrument accuracy 0.01mm4.4.3
Construction process
The treated surface to be lined should be kept dry, free of debris and pollution. 4.5.2
Primer coating
4.5.2.1 Take an appropriate amount of pre-mixed primer, add a specified amount of curing agent in proportion, stir evenly for use, 4.5.2.2 Apply the first coat of primer to the surface to be lined after treatment according to 4.4.1 or 4.1.2, and apply the second coat of primer 12 hours after the first coat of primer is applied. The two primers should be applied perpendicularly to each other. 4.5.3 Flake lining application
4.5.3.1 Take an appropriate amount of flake mortar premix, add the specified proportion of pigment-containing curing agent, put it into a vacuum mixer, and stir it evenly under the condition of vacuum not less than 0.08MPa.
4.5.3.2 Use a spatula to evenly apply the construction material on the surface of the base to be primed in one direction. The construction thickness of each lining layer (after initial setting) is 1.0±0.2mm. The interval between each two coatings is 12h. 4.5.3.3 Under normal circumstances, two coats are sufficient. Under special circumstances (such as solid abrasives in the medium), the construction thickness can be increased to three coats. 4.5.3.4 After each coat of lining mortar is applied, it must be rolled with a wool felt roller dipped in solvent before initial setting until the constructed lining is smooth and uniform when observed by naked eyes. No traces of fullness are allowed on the surface of the lining layer. Once it is produced, it should be rolled flat again. 4.5.3.5 During the lining construction process, the construction surface should be kept clean. If there are protrusions or construction drips, they should be polished and smoothed. The construction materials should be used up within 30 minutes, and the initial setting time should be controlled within 40 minutes. 4.5.3.6
The end interface of the two coatings should avoid butt joint, and overlap must be adopted, see Figure (1). Fresh sheet mortar layer
Primer layer
Protected substrate
Overlap (correct)
Scale sheet mortar layer
Primer layer||tt| |Protected substrate
Jointing·Anti-corrosion weak points (incorrect)
HG/T2640--94
4.5.3.8 The color of the construction material of each lining layer should be different to facilitate the detection of missed coating. 4.5.3.9 After each layer of construction material is applied, it should be inspected by an electric spark detector. The starting detection voltage shall not be less than 3000V, and the detection voltage increment for each layer shall be 3000V.
4.5.4 Village layer repair
4.5.4.1 When pinholes or debris are found during detection, they should be polished and removed by a grinder. Pinholes or defects that penetrate the lining should be polished to the bottom surface and form a slope transition. The angle between the slope and the substrate should be <15" (see Figure 2). After cleaning with solvent and drying, re-apply primer and construction materials according to 4.5.2 and 4.5.3.
Polishing area
Capillary pores
Second layer
Second layer repair,
First layer lining
Bottom surface!
First layer repair||t t||4.5.4.2 If there are defects such as missing coating or insufficient thickness of local lining layer, the surface of the area should be cleaned with solvent, and then the construction material should be applied again to reach the specified thickness after drying. www.bzxz.net
4.5.4.3 After the scaffolding is removed, its support points should be repaired according to 4.5.4.1. 4.5.5 Local glass cloth reinforcement
4.5.5.1 The inner corner area of ​​the lined equipment, the inner surface of the pipe, and the flange sealing end face should be in the scale lining After the lining glue is cured, glass cloth is used for reinforcement. The adhesive material for sticking glass cloth must be made of the same resin as the scale lining glue. 4.5.52 Grind the surface of the scale lining to be pasted with glass cloth flat, clean it with solvent, and then proceed in the order of glue application-cloth application-glue application-cloth application-glue application (i.e. two cloths and three glues). The overlap length of glass cloth should be >50mm. The requirements for the number of cloths in the reinforcement area are shown in Figure 3. Reinforcement layer
Putty layer
Glue layer
Primer layer
>100mm
Corner area reinforcement
>100mm
Reinforcement to the outer edge of the sealing surface
Weaving surface, flange surface, joint area reinforcement
4.5.5.3 The sealing surface of the village flange should be flat. After 12 hours of glass cloth reinforcement construction, the burrs of the reinforcement area should be removed. 4.5.6 Topcoat
4.5.6.1 should be applied after completing 4.5.1~4.5.5 After the specified process, apply the topcoat. HG/T2640-94
4.5.6.2 Take an appropriate amount of pre-mixed topcoat, and add the specified amount of pigment curing agent, stir evenly and then apply. Apply two coats of topcoat, the brushing directions should be perpendicular to each other, and the two coats of topcoat should be applied 12 hours apart. 4.5.7 After the construction is completed, the curing period in the equipment at the construction temperature shall not be less than 7 days. 5 Inspection and acceptance
The construction of the flake village single needs to be inspected according to the construction process. The specific inspection process, requirements and methods are shown in Table 1. Table 1
Surface treatment
Flake lining
Glass cloth
Flake lining quality inspection table
Conform to the requirements of 4.1 of this standard
According to the items specified in 4.1 of this standard
a. Primer preparation
b. Painting quality
c. Number of painting
a. Construction material preparation
b. Construction thickness
c. Pinhole detection
d. Missing application and liquid leakage
e. Insufficient solidification of debris
a. Grinding the angle between the slope and the substrate
b. Post-repair inspection
a. Counting process
b. Application area
c. Appearance quality
a. Topcoat preparation
b. Painting quality
c. Number of times of painting
a. Meet the requirements of 4.5.2:1
b. Uniform without omission
c. Two vertical coatings
a. Meet the requirements of 4.3
b. Each layer: 1±0.2mm
c. Voltage increase of each layer 3000V
a. Angle <15°
b. Same as the process No. 3 in this table
a. Comply with the provisions of 4.5.5 of this standard
a. Comply with the provisions of 4.5.6 of the whole standard
b. Thickness gauge detection
C. Electric spark detection
a. Measure with 15-degree angle
b. Same as the process No. 3 in this table
Measure with ruler, visual inspection
The final inspection and acceptance of construction shall be jointly conducted by the construction and user parties. During the inspection and acceptance, the quality inspection record of the construction process shall be issued. 5.2
Additional instructions:
This standard was proposed by China National Chemical Equipment Corporation and is under the jurisdiction of the National Technical Committee for Standardization of Non-metallic Chemical Equipment. This standard was drafted by the Chemical Machinery Research Institute of the Ministry of Chemical Industry, and the main drafters of this standard are: Zheng Weijing and Jiang Peifu. People's Republic of China
Chemical Industry Standard
Technical Conditions for Construction of Glass Flake Lining
HG/T2640-94
China National Chemical Equipment Corporation
Postal Code
100011
Printed by Beijing Institute of Chemical Technology Printing Plant
Copyright reserved
880×1230
First Edition in June 1995
No Reprinting
9,000 Words
First Printing in June 1995
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