GB/T 30788-2014 Specification for the operation of cold-wrapped mineral grease tape for external wrapping of steel pipes GB/T30788-2014 |tt||Standard compression package decompression password: www.bzxz.net
This standard specifies the material requirements, design, construction and acceptance of the anti-corrosion construction of cold-wrapped mineral grease tape on the outer surface of steel pipes and special-shaped parts (such as flanges, valves, tees, crosses, etc.). This standard is applicable to the construction of cold-wrapped mineral grease tape for the external anti-corrosion layer of steel pipes and special-shaped parts in atmospheric environments (including humid environments). Other special-shaped steel structures suitable for cold-wrapped mineral grease tape can also refer to this standard for external anti-corrosion.
This standard was drafted in accordance with the rules given in GB/T1.1-2009.
This standard was proposed by the China Petroleum and Chemical Industry Federation.
This standard is under the jurisdiction of the National Technical Committee for Standardization of Corrosion Protection (SAC/TC381).
The drafting organizations of this standard are: Aizhi Industrial Technology Group, Jingrui Chemical (Shanghai) Co., Ltd., Beijing Bihaizhou Corrosion Protection Industry Co., Ltd., Institute of Oceanology, Chinese Academy of Sciences, and China Industrial Corrosion Protection Technology Association.
The main drafters of this standard are: Wang Yong, Zhang Jun, Chen Jia, Zhang Shiqi, Zhang Xiaoguang, Li Yantao, Zhao Xia, Di Jianjun, and Ren Zhenduo.
This standard is published for the first time.
The following documents are indispensable for the application of this document. For all dated referenced documents, only the dated version applies to this document. For all undated referenced documents, the latest version (including all amendments) applies to this document.
GB/T1037 Test method for water vapor permeability of plastic film and sheet - Cup method
GB/T1040.2 Determination of tensile properties of plastics - Part 2: Test conditions for molded and extruded plastics
GB/T1408.1 Test method for electrical strength of insulating materials - Part 1: Tests at power frequency
GB/T3536 Determination of flash point and fire point of petroleum products - Cleveland open cup method
GB/T3820 Determination of thickness of textiles and textile products
GB/T6343 Determination of apparent density of cellular plastics and rubber
GB/T8026 Determination of melting point of petroleum waxes and petroleum fats
GB8624 Classification of burning behavior of building materials and products
GB/T8923.1 Surface preparation of steel before coating Visual assessment of surface cleanliness Part 1: Rust grades and treatment grades of uncoated steel surfaces and steel surfaces after complete removal of existing coatings
GB/T10125 Artificial atmosphere corrosion test Salt spray test
GB/T13377 Determination of density or relative density of crude oil and liquid or solid petroleum products Capillary plug pycnometer and graduated double capillary pycnometer method
SY/T0315—2005 Technical specification for single-layer fusion-bonded epoxy powder external coating of steel pipelines
SY/T0415—1996 Technical standard for rigid polyurethane foam anticorrosive and thermal insulation layer of buried steel pipelines

ICS25.220.99
National Standard of the People's Republic of China
GB/T30788—2014
Specification of cold-applied petrolatum tape coatings for steel pipelines2014-07-08Published
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of ChinaStandardization Administration of the People's Republic of China
Implemented on 2014-12-01
National Standard of the People's Republic of China
Specification of cold-applied petrolatum tape coatings for steel pipelinesExternal winding for anti-corrosion of steel pipelines
Cold-applied petrolatum tape coatings for steel pipelinesGB/T 30788—2014
Published by China Standards Press
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This standard was drafted in accordance with the rules given in GB/T1.12009. This standard was proposed by the China Petroleum and Chemical Industry Federation. This standard is under the jurisdiction of the National Anti-Corrosion Standardization Technical Committee (SAC/TC381). GB/T30788--2314
The drafting units of this standard are: Aizhi Industrial Technology Group, Jingrui Chemical (Shanghai) Co., Ltd., Beijing Bihaizhou Corrosion Protection Industry Co., Ltd., Institute of Oceanology, Chinese Academy of Sciences, and China Industrial Anti-Corrosion Technology Association. The main drafters of this standard are Wang Yong, Zhang Jun, Chen Jia, Zhang Shiqi, Zhang Xiaoguang, Li Yantao, Zhao Xia, Di Jianjun, and Ren Zhenduo. This standard is recommended for the first release.
1 Scope
GB/T307882014
Operation Specification for External Wrapping of Steel Pipe with Anti-Corrosion Cold Wrapping Mineral Fat Tape This standard specifies the material requirements, design, construction and acceptance of the anti-corrosion cold wrapping mineral fat tape on the outer surface of steel pipes and special-shaped parts (such as flanges, valves, tees, crosses, etc.) for anti-corrosion construction. This standard applies to the construction of anti-corrosion cold-wrapped petrolatum tape for the external anti-corrosion layer of steel pipes and special-shaped parts in atmospheric environments (including humid environments). Other special-shaped steel structures suitable for cold-wrapped petrolatum tape can also refer to this standard for external anti-corrosion. 2 Normative references
The following documents are essential for the application of this document. For all dated references, only the dated version applies to this document. For all undated references, the latest version (including all amendments) applies to this document. GB/T1037 Test method for water vapor permeability of plastic film and sheet - Cup method GB/T1010.2 Determination of tensile properties of plastics - Part 2: Test conditions for molded and extruded plastics GB/T1408.1 Test method for electrical strength of insulating materials - Part 1: Tests at power frequency GB/T3536 Determination of flash point and ignition point of petroleum products - Cleveland open cup method GB/T3820 Determination of thickness of textiles and textile products GB/T6343 Determination of apparent density of foam plastics and rubber GB/T8026 Determination of melting point of petroleum wax and petroleum fat droplets GB8624 Classification of burning behavior of building materials and products GB/T8923.1 Surface treatment of steel before summer paint Surface cleanliness Visual assessment of corrosion - Part 1: Rust grade and treatment grade of uncoated steel surfaces and steel surfaces after comprehensive removal of all coatings GB/T10125 Corrosion test in artificial atmosphere Salt spray test GB/T13377 Determination of density or relative density of crude oil and liquid or solid petroleum products
Capillary plug pycnometer and scaled
Double capillary pycnometer method
SY/T03152005
Technical specification for single-layer fusion-bonded hydrogen ring powder external coating of steel pipelinesSY/T0415:1996 Technical standard for rigid polyurethane foam anti-corrosion and thermal insulation layer of buried steel pipelines 3 Terms and definitions
The following terms and definitions apply to this document. 3.1
Petrolatum tape primer is a viscous paste product made of petroleum grease (or paraffin) as the main film-forming substance and functional additives such as antioxidants and non-volatile plasticizers. It does not contain volatile solvents. 3.2
Petrolatum tape
It is a flat, flexible tape product that can be rolled and rolled, made of non-woven fabric as the molding carrier and semi-solid petroleum grease (or paraffin) at room temperature as the main molding substance, through the process of rolling and impregnation of high-temperature liquid petroleum grease (or paraffin), air cooling and shaping, trimming and shaping. According to the environmental requirements of use, the specified amount of functional components and flame retardant additives can be pre-mixed evenly in petroleum grease (or paraffin). 3.3
Profilingmastic
is a light petrolatum mastic made of hydrocarbons, small-particle porous polymers, etc., which has good thixotropy, strong plasticity and can be constructed at room temperature.
4 Materials
Material system
The material particle system includes: petrolatum tape primer, petrolatum tape, sealing mud, etc. 4.2
Mineral jelly tape primer
The performance of mineral jelly tape primer shall comply with the provisions of Table 1. Table 1 Performance requirements of mineral jelly tape primer
Density p,/(g/cml)
Flash point/℃
Drop melting point/
Petroleum grease or paraffin content (mass fraction)/%4.3 Mineral jelly tape
4.3.1 Size
0.90≤pl1.25
The width of the mineral jelly tape is greater than or equal to 50mm and less than or equal to 300mm. 4.3.2 Performance
The performance of the mineral jelly tape shall comply with the provisions of Table 2. Table 2 Performance requirements of petrolatum tape
Thickness/mm
Flame retardant grade
Dielectric strength (55% overlap)/kV
Dielectric strength (single)/kV
Breaking strength/MPa
Elongation at break/%
Water vapor transmission rate/(mg/cm24h)
≥200
≥150
Test method
GB/T13377
GB/T3536
GB/T8026
Appendix A
Test method
GB/T3820
GB8624
GB/T 1408.1
GB/T 1408.1
GB/T 1040.2
GB/T 1040.2
GB/T356
GB/T1037
Petroleum grease or paraffin content (mass fraction)/% Drop melting point/℃
Neutral salt spray test (100ch)
Chemical medium resistance
Corrosion (normal temperature, 7d)
4.4 Sealing mud
10%HCI
10%NaOH
3%NaCl
The performance of the sealing mud shall meet the requirements of Table 3. Item Date
Apparent density pz/(kg/m*)
Water absorption/(g/cm2)
Chemical corrosion resistance
(normal temperature, 7d)
5 Design
Basic data
Technical data
10%HCI
10%NaOH
3%NaCl
Table 2 (continued)
Rust-free
Performance requirements of sealing mud
6002650
6×10-4
The technical data to be collected include but are not limited to: a
The area and structural status of the pipeline and related accessories and other facilities to be protected: Design service life of the pipeline or facilities to be protected ; Appendix A
GB/T30788--2014
Test method
GB/T8026
GB/T10125
SY/T0315—2005 Appendix I
Test method
GB/T6343
SY/T0415—1996 Appendix B
SY/T0315—2005 Appendix I
When two or more pipelines are laid in the same trench, the relative minimum spacing between pipelines and pipelines, and between pipelines and trenches; the supporting structure form of pipelines and related accessories and their anti-corrosion requirements; the requirements for construction period, start and completion date; related parameters of the flow medium in the pipeline: such as medium temperature, pressure, etc. Environmental conditions
Environmental data to be collected include but are not limited to: acid rain conditions;
environmental temperature and its changing rules;
c) whether there are strong acid, strong alkali and other corrosive media in the working environment; GB/T30788-2014
relative humidity and its changing rules;
content of saturated ions (such as SO2, CI-, F-, etc.). 5.2 Cold-wound mineral fat tape outer anti-corrosion layer structure design 5.2.1 According to the size of the pipeline diameter, select different winding ratios, see Table 4. Table 4 Winding ratio thickness of different diameters
Pipeline straightness/mm
Wrapping ratio/%
Mineral fat tape thickness/mm
5.2.2 According to different pipeline structures, different material systems are used: Mineral fat tape primer thickness/mm
a) Straight pipeline outer anti-corrosion layer structure: primer + mineral fat winding tape, see Figure 1 for the structure diagram. Description:
Pipeline:
Primer:
Mineral grease tape.
Figure 1 Straight pipe
Total thickness/mrr
Structure of the external anti-corrosion layer of special-shaped pipes and pipe fittings: mineral grease tape primer + sealing mud + mineral grease winding tape, the structure diagram is shown in Figure 2. b)
Description:
Mineral grease tape,
Sealing mud:
Primer. Www.bzxZ.net
Figure 2 Special-shaped pipes and pipe fittings
c) External anti-corrosion and thermal insulation composite pipe external anti-corrosion layer structure: straight pipe is primer + mineral grease winding tape insulation layer, special-shaped pipes and pipe fittings are mineral grease tape primer + sealing mud + mineral finger winding tape + insulation layer, the insulation layer should be installed on the outer surface of the mineral grease. 4
GB/T3078B—2014
d) External anti-corrosion layer structure against environmental damage: straight pipes are primer-petroleum grease wrapping tape + reinforced structure layer, special-shaped pipes and pipe fittings are petroleum grease tape primer + sealing mud + petroleum grease wrapping tape + reinforced structure layer, and the reinforced structure layer can be a wound glass fiber reinforced plastic layer, polypropylene or polyvinyl cyanide outer protective cover.
6 Construction
6.1 Construction environment and safety requirements
6.1.1 The construction environment should meet the following requirements: - The construction environment temperature should be ≥5℃;
- Wind and rain protection facilities should be set up during open-air construction. 6.1.2 Construction safety should meet the following requirements: - Good ventilation conditions at the construction site; Open flames are strictly prohibited at the construction site;
- Scaffolds or hangers used for construction should be firm and stable, and should avoid contact with the surface of the substrate to be protected; - Two layers of safety nets should be set for high-altitude operations; - Construction safety and labor protection should comply with relevant national regulations. 6.2 Construction process
6.2.1 Surface pretreatment
6.2.1.1 Use appropriate methods to remove dirt, grease, dust, oxide layer, etc. on the surface of the steel pipe. The metal surface treatment should reach the St2 level specified in GB/T8923.1.
6.2.1.2 For sharp edges, burrs, rough welds, and sharp external corners that may scratch the petrolatum belt, mechanical grinding should be used to remove or flatten and round.
6.2.1.3 The weld nodules, arc pits and splashing welding slag on the surface of the substrate to be protected must be polished smooth. 6.2.1.4 For defects such as pits and serious scratches on the surface of the anti-expansion substrate, it is necessary to use sealing mud to fill and fill. The time interval between the pretreatment of the steel pipe surface and the application of primer should be controlled within 4 hours, and the surface of the steel pipe should be prevented from being contaminated during this period. Before applying 6.2.1.5
primer, if rust or surface contamination occurs, the surface should be pretreated again. 6.2.2 Primer application
Primer and mineral belt should be selected from the same manufacturer. Primer should be applied according to the requirements of the primer manual. The primer should be applied evenly. No missing coating is allowed, and the coverage rate is 2m2/kg5m2/kg. 6.2.2.2
After the primer is applied, wrap the mineral fat belt to prevent the surface contamination of the primer. 6.2.2.3
6.2.3 Sealing mud filling
6.2.3.1 For special-shaped structures, gap structures, pipe support frames and hole structures (such as connecting flanges, tee angles, straight-welded pipe supports, etc.) that cannot be directly and tightly wound with petrolatum tape, sealing mud should be used to fill the cold tightly. The sealing mud should be filled layer by layer or area by area from the inside to the outside to exclude the air between the layers and prevent the formation of bubbles between the sealing mud layers. 6.2.3.2
Sealing mud filling After separation, the outer surface treatment room should be smooth, dense, and linearly transitioned. 6.2.4 Petrolatum tape winding
6.2.4.1 Spiral winding of petrolatum tape with equal distance and overlapping edges. The winding ratio is shown in Table 4. 6.2.4.2 When winding, the end of the petrolatum tape should be close to the pipeline base. The midpoint of the outer side of the white petrolatum tape end should be pushed to both sides and wound and laid one by one. While laying 5
GB/T30788-2014
, the air between the layers should be squeezed out and the feeling should be released. The petrolatum tape should be prevented from being damaged during the winding process. 6.2.4.3 The surface of the wound petrolatum tape should be complete, dense, smooth and free of wrinkles, edges, folds, damage, bubbles and other defects. The winding thickness should meet the design requirements.
6.2.4.4 For pipes that need to be wrapped with petrolatum tape and then welded and installed, a 200mm anti-corrosion section should be reserved on both sides of the pipe weld. During welding and installation, a layer of insulation material should be covered on the surface of the anti-corrosion layer on both sides of the weld to prevent splashing molten steel, welding slag, etc. from scalding the petrolatum tape. Welding should not be performed on the part where the petrolatum tape has been wrapped. 6.2.5 Damage repair and repair
6.2.5.1 For local damage quality defects on the surface of the anti-corrosion layer, local excavation repair should be adopted. 6.2.5.2 Use special tools to completely remove the damaged anti-corrosion layer and clean the primer at the corresponding part. 6.2.5.3 Apply primer, cut the petrolatum tape according to the shape of the damaged anti-corrosion layer, patch the damaged part, exclude air when patching, and then add a layer of petrolatum tape protection layer on the patching area. The size should exceed the damaged edge by at least 50mm, see Figure 3. 50mm
Explanation:
1—Damage;
2 Petrolatum tape;
3——Primer.
Figure 3 Schematic diagram of patching
6.2.5.4 The patching construction should be carried out according to the anti-corrosion layer structure selected by the design and the provisions of 6.2.5.1 and 6.2.5.2. The overlap width between the anti-corrosion layer and the original anti-corrosion layer in the patching area shall be no less than 200mm, see Figure 4. 200mm
Description:
Weld;
Primer;
Mineral fat tape.
Figure 4 Patching Schematic Diagram
6.2.5.5 For the ring-shaped damage quality defects on the surface of the anti-corrosion layer, the ring-shaped excavation type repair shall be adopted, and the repair process is the same as the patching. 6
6.3 Pipeline Installation and Lifting
GB/T30788—2014
The wound pipes shall be installed immediately and shall not be stacked. Non-metallic wide slings shall be used for transportation and hoisting. If necessary, protective covers shall be added to the lifting points. When hoisting, the anti-corrosion layer shall be lifted gently and lowered slowly without damaging the anti-corrosion layer. 7 Inspection and Acceptance
7.1 Inspection during Construction
The quality of the pretreatment of the steel pipe surface shall comply with the provisions of 6.2.1. 7.1.14
7.1.2 The quality of the primer coating shall comply with the provisions of 6.2.2. 7.1.3 The quality of petrolatum tape winding shall comply with the provisions of 6.2.4. 7.2 Inspection after construction
After the winding work is completed, the winding tape should be tightly wound, flat and free of bubbles when observed with the naked eye. 7.2.1
7.2.2After the winding work is completed, the winding tape should be wound according to the designed re-entry ratio when observed with the naked eye, and the system thickness should meet the requirements of Table 4. 7.3 Project acceptance
7.3.1 The specifications and contents shall comply with the contract provisions. 7.3.2 The quality of the project shall comply with the provisions of the design documents and this standard. 7.4
Submitted technical documents
The submitted technical documents include:
a) As-built drawings;
Documents proving the design change;
Instructions, test records, product certificates and installation drawings provided by the manufacturer; d) Installation records;
Construction process quality inspection records;
Completion acceptance report.
5 Documents and preservation
Material testing materials
Including the test reports and certificates of anti-corrosion materials required for construction. 7.5.2 Construction-related records
Including design plans, drawings, construction process records, completion reports, etc. 7.5.3 Post-maintenance management materials
Including anti-corrosion effect tracking test reports, engineering repair records, etc. 7.5.4 Preservation
During the design protection period of the petrolatum anti-corrosion system, relevant design, construction, investigation, testing and test documents should be preserved. GB/T30788—2014
A.1 Experimental instruments
Appendix A
(Normative Appendix)
Method for determination of petroleum grease or paraffin content A.1.1
Soxhlet extraction reflux condenser equipment. 2 Volumetric flask 250mL.
Electric heating jacket.
A.1.4 Casing: 22mrX88mm.
Filter paper: medium speed or slow speed.
A.2 Reagents
Use trichloroethylene or other suitable solvents. A.3 Test steps
A.3.1 Bake the casing and filter paper at 1c5℃ for at least 30min, take them out and place them in a desiccator for 30min, then weigh them and record them as m (g), keep two decimal places. The weighing process should be carried out in a dry environment as much as possible to avoid water absorption. A.3.2 Weigh about 5% of the sample and put it into the casing, and fold the filter paper to fit the diameter of the casing. The filter paper should be higher than the top of the sample (the function of the filter paper is to ensure that the insoluble raw materials are sucked out of the solvent). A.3.3 Weigh the casing and filter paper with the sample, record them as m2 (g), keep two decimal places. A.3.4 Place the sleeve in the Soxhlet instrument. The temperature of the solvent and the cooling rate of the condenser can be adjusted to ensure the normal flow of the solvent through the Soxhlet instrument and the sleeve. Repeatedly rinse with solvent until the color of the sample no longer changes. Remove the sleeve from the heating jacket and cool it to room temperature before removing the instrument. Dry it in ventilated air for 1 hour. Then put the sleeve into a 105℃ oven for 30 minutes, and then put it into a desiccator to cool for 30 minutes. A.3.5 Weigh the weight of the sleeve and filter paper again, record it as m (g), and keep 2 decimal places. A.4 Calculation of results
The content of petroleum grease or paraffin component α (%) is calculated according to formula (A.1): w=(mz-m)/(m2-m)x1c0%
Wherein:
The value of the mass of the empty casing and filter paper, in grams (g); m?---The value of the mass of the casing and filter paper with the product added, in grams (g); m. The value of the mass of the casing and paper after the test, in grams (g). GR/T30788-2014
Printing date: October 22, 2011 HF009A
.(A.1)
Copyright exclusive infringement must be investigated
Book number: 155066·1-49961
Price:
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