Piping and equipment corrosion
1 scope
This technology standard is suitable for indoor and outdoor pipeline corrosion protection engineering, equipment and containers.
2 construction preparation
2.1 material requirements:
2.1.1 anti-rust paint, paint, asphalt, etc have factory certification.
2.1.2 thinner, gasoline, kerosene, alcohol acid thinners, rosin water, alcohol, etc.
2.1.3 other materials: kaolin, seven asbestos, lime powder or powder, glass fiber cloth, cotton paper, linoleum, kraft paper, plastic sheeting, etc.
2.2 the main equipment:
2.2.1 equipment: spray gun, air compressor, diamond grinding wheel, derusting machine, etc.
2.2.2 tools: scraper, file, wire brush, emery cloth, abrasive paper, brush pot, cotton silk, asphalt, etc.
2.3 operation conditions:
2.3.1 have shelved pipes, equipment, containers and rotting operation site.
2.3.2 construction in more than 5 ℃, environment temperature and ventilation is good, no soot, dust and moisture, etc. Construction to take the temperature below 5 ℃ in winter measures.
3 operation process
3.1 process:
Piping, equipment and container cleaning, derusting, piping, equipment, and brush container anticorrosive oil
3.2 piping, equipment and container cleaning, derusting,
3.2.1 artificial cleaning:
Scraper, file the oxide coating on the surface of the pipe, equipment and containers, casting sand, with a wire brush to piping, equipment, and floating to remove rust on the surface of the container, then use sand paper burnish, finally wipe it with the cotton silk.
3.2.2 mechanical descaling:
Use knife, file first oxide coating on the surface of the pipe, sand casting, removed. Then a person before derusting machine, one after the derusting machine, pipe is placed within the derusting machine repeatedly derusting, until bared metal color. Before brushing oil, use cotton silk wipe again, its surface float ash, etc.
3.3 piping, equipment and container anticorrosive oil brush:
3.3.1 piping, equipment, and the container valve, general anticorrosion brush oil, according to the design requirements when the design requirements, shall be in accordance with the following provisions:
3.3.1.1 Ming pipe, equipment and container must first brush anti-rust paint, stay two paint is brushed again before commissioning. For insulation and condensation prevention requirement should brush anti-rust paint.
3.3.1.2 dark piping, equipment and container to brush two antirust paint, the name of the second antirust paint must be the first line of paint brush after dry. And antirust paint consistency to be appropriate.
3.3.1.3 anticorrosive coating of buried pipe, its outer wall corrosion protection layer shall be conducted according to table 1-39.
When winter construction, appropriate USES rubber solvent oil or aviation gasoline melting 30 asphalt or 30 b. The weight ratio: asphalt, gasoline = 1:2.
3.3.2 rainfall distribution on 10-12 anticorrosive coating method has two kinds:
3.3.2.1 manual brushing: manual besmear brushs should be layered coating, each layer should be, reciprocating, maintain uniform coating, shall not leak or flow.
3.3.2.2 machinery coating: coating spray paint flow with spray paint surface vertical, spray paint surface is flat, nozzle and spray paint surface should be 250 ~ 350 mm apart, spray paint surface such as the circular arc surface, nozzle and spray paint surface distance should be about 400 mm. When spraying, the movement of the nozzle should be uniform, speed should be kept in 10 ~ 18 m/min, spray paint using compressed air pressure is 0.2 ~ 0.4 MPa.
3.3.3 of buried pipeline corrosion protection:
Buried pipeline coating is mainly composed of base oil, cold asphalt emperor fat, waterproofing and kraft paper, etc.
3.3.3.1 cold priming oil components are shown in table 1 to 40.
Pipeline anticorrosive coating types - 39 in table 1
Anticorrosion layers of time (normal) from the metal surface coating strengthening anticorrosion coating, anticorrosive coating
1
2
3
4
5
6
7
Coating thickness is not less than (mm)
Priming oil thickness allowable deviation (mm) cold
Asphalt coating
Outsourcing protective layer
3
0.3 adhesive bitumen primer
Asphalt coating
Strengthen the binding layer (seal)
Asphalt coating
Outsourcing protective layer
6
0.5 adhesive bitumen primer
Asphalt coating
Strengthen the protection layer (seal)
Asphalt coating
Strengthen the binding layer (seal)
Asphalt coating
Outsourcing protective layer
9
0.5
Note: 1.
2.
3.
4.
5. Strengthen the bandaged with glass cloth layer, shall apply a cold priming oil seal;
Do anti-corrosion dressing in layers, joint lap length of 30 ~ 50 mm, outsourcing protective layer, lap length of 10 ~ 20 mm;
Not connected intermitting position of interface or construction should be done on each floor contraction of 80 ~ 100 mm stepwise summer-planting;
Besmear brushs anticorrosive priming oil cold should be uniform, thickness is 0.1 ~ 0.15 mm;
Cold priming oil mixture ratio: the weight of the asphalt: gasoline = 1:2.25.
Cold priming oil composition table 1 to 40
Using a piece of asphalt, gasoline (weight ratio) asphalt, gasoline (volume ratio)
In the temperature + 5 ℃ above
The temperature below + 5 ℃ 1:2.25 ~ 2.5
1, 2, 1, 3
1:2.5
The refrigeration priming oil asphalt, asphalt is a brand for 30 architecture. Before stewing, the asphalt into small pieces under 1.5 kg, clean up the pan with asphalt, rising up and stirring, and keep the temperature within the range of 180 ~ 200 ℃ (highest do not exceed 220 ℃), the general should be made under this temperature 1.5 ~ 2.5 hours, until does not produce bubbles, it indicates that the dehydration. According to the mixture will be cooled to 100 ~ 120 ℃ dehydration asphalt slowly in measuring good unleaded gasoline, and keep stirring until completely mixing.
Within 24 hours after cleaning pipe surface brush adhesive bitumen primer, coating should be uniform and the thickness of 0.1 ~ 0.15 mm.
3.3.3.2 emperor of proportion of fat: asphalt asphalt: kaolin = 3:1.
A building asphalt asphalt should be 30 and 10 or 30 armor construction of asphalt mixture. Temperature at 180 ~ 200 ℃ to add dryness and dehydration asphalt heating to 120 ~ 140 ℃ of kaolin, stirring constantly, make its mixed evenly. Softening point and then determine asphalt emperor fat, extension, three technologies such as penetration index, reaches the prescribed in table 1-41 for qualified.
Besmear foam asphalt when emperor fat, its temperature should be kept in 160 ~ 180 ℃, construction temperature is above 30 ℃, the temperature can be reduced to 150 ℃. Hot asphalt emperor grease should be applied in cold dry clean base oil, uniform coating. The innermost asphalt emperor fat as a painted the foam, with artificial or half mechanization should be divided into the second floor, each layer of 1.5 ~ 2 mm thick.
3.3.3.3 waterproofing materials generally USES mineral wool paper linoleum or have a cold glass of priming oil net cloth, spiral wrap bag on the hot asphalt tamar emperor lipid layer, each lap is allowed no greater than 5 mm gap between or take sides, front and back coil of lap length is 80 ~ 100 mm, with hot asphalt emperor fat will glue joint.
Asphalt emperor fat technical indicators table 1-41
Construction temperature
Medium temperature (℃)
(℃) softening point method (global)
(℃) extension degree (+ 25 ℃)
(cm) penetration
(0.1 mm)
- 25 ~ + 5
- 25 ~ + 25
+ 25 ~ + 56
+ 56 ~ + + 56 70 ~ + 75
+ 80 ~ + 90
+ 85 ~ + 90 3 ~ 4
2 ~ 3
2 ~ 3 -
25 to 35
20 ~ 25
+ 5 ~ + 30
- 25 ~ + 25
+ 25 ~ + 56
+ 56 ~ + 70 + 70 ~ + 80
+ 80 ~ + 90
+ 90 ~ + 95 2.5 ~ 3.5
2 ~ 3
1.5 ~ 2.5 15 ~ 25
10 ~ 20
10 ~ 20
More than 30 +
- 25 ~ + 25
+ 25 ~ + 56
+ 56 ~ + 70 + 70 ~ + 90
+ 90 ~ + 95
+ 90 ~ + 95 2 ~ 3
1.5 ~ 2.5
1.5 ~ 2.5 -
10 ~ 20
10 ~ 20
3.3.3.4 wrapped package kraft paper, each lap due on 15 ~ 20 mm, between before and after the two volumes of lap length is not less than 100 mm, joint with hot asphalt emperor fat or cold priming oil glue. Kraft paper, also can use PVC plastic sheeting or no cold glass of priming oil mesh fabric.
3.3.3.5 to make strong anti-corrosion layer, two waterproof coil winding direction should be the opposite.
3.3.3.6 anticorrosive coating of pipe have been made when lifting, should use soft straps or not damaged cords of anticorrosive coating, so as not to damage the coating. Pipe ditch before the mucking, to make bottom level off, without stone, brick and tile or other debris. Upper if very hard, should be in the groove bedding 100 mm soft fine soil, under the pipe ditch, forbid to use crowbar tube, more may not be directly push pipe trench.
3.3.3.7 anticorrosive coating on all defects, unqualified place and ditches under inspection and damaged parts, repair should be before the trench backfilling, backfill, appropriate to use a layer of fine soil backfilled, buried pipe roof, and then with artificial or mechanical backfill.
4 quality standards
4.1 ensure projects:
4.4.1 of buried pipeline coating shall meet the following requirements:
Material and structure in accordance with the rules and regulations of the design requirements and construction. Coil and pipe and stickup and firm, between each layer coil surface level off, without buckling, empty drum, defects such as sliding and sealing is lax.
Test method: to observe the cut or coating inspection.
4.1.2 pipeline, box type and metal stents painting shall meet the following requirements:
Times comply with the design requirements, types and besmear brushs paint adhesion is good, without peeling, blister and the coating, the film thickness uniformity, colour and lustre is consistent, no flow drop and pollution phenomenon.
Inspection method: to observe the examination.
5 finished product protection
5.1 anticorrosion coating of pipeline and equipment has been completed to be separated, not adhesion, lest destroy the anti-corrosion layer.
5.2 oil brush to clean up the surrounding environment before, to prevent the dust float in the sky, keep clean, in case of strong wind, rain, fog, snow can not open.
5.3 paint of piping, equipment and containers, lacquer layer in the process of drying should prevent freezing, impact, vibration and temperature, radical changes.
6 should pay attention to quality problems
6.1 pipe surface peeling rust and return. The main reason is not pipe derusting net.
6.2 pipe, equipment and container, uneven surface paint flow falling or leakage phenomenon, mainly oil brush with paint too much and not serious.
7 should possess the quality of the record
7.1 anti-rust paint, paint, asphalt material such as dolphin diluent should have the factory certificate.
7.2 should approach the acceptance record.
7.3 before the pipeline and equipment anticorrosion engineering records.
7.4 after the completion of the acceptance record.
1 scope
This technology standard is suitable for indoor and outdoor pipeline corrosion protection engineering, equipment and containers.
2 construction preparation
2.1 material requirements:
2.1.1 anti-rust paint, paint, asphalt, etc have factory certification.
2.1.2 thinner, gasoline, kerosene, alcohol acid thinners, rosin water, alcohol, etc.
2.1.3 other materials: kaolin, seven asbestos, lime powder or powder, glass fiber cloth, cotton paper, linoleum, kraft paper, plastic sheeting, etc.
2.2 the main equipment:
2.2.1 equipment: spray gun, air compressor, diamond grinding wheel, derusting machine, etc.
2.2.2 tools: scraper, file, wire brush, emery cloth, abrasive paper, brush pot, cotton silk, asphalt, etc.
2.3 operation conditions:
2.3.1 have shelved pipes, equipment, containers and rotting operation site.
2.3.2 construction in more than 5 ℃, environment temperature and ventilation is good, no soot, dust and moisture, etc. Construction to take the temperature below 5 ℃ in winter measures.
3 operation process
3.1 process:
Piping, equipment and container cleaning, derusting, piping, equipment, and brush container anticorrosive oil
3.2 piping, equipment and container cleaning, derusting,
3.2.1 artificial cleaning:
Scraper, file the oxide coating on the surface of the pipe, equipment and containers, casting sand, with a wire brush to piping, equipment, and floating to remove rust on the surface of the container, then use sand paper burnish, finally wipe it with the cotton silk.
3.2.2 mechanical descaling:
Use knife, file first oxide coating on the surface of the pipe, sand casting, removed. Then a person before derusting machine, one after the derusting machine, pipe is placed within the derusting machine repeatedly derusting, until bared metal color. Before brushing oil, use cotton silk wipe again, its surface float ash, etc.
3.3 piping, equipment and container anticorrosive oil brush:
3.3.1 piping, equipment, and the container valve, general anticorrosion brush oil, according to the design requirements when the design requirements, shall be in accordance with the following provisions:
3.3.1.1 Ming pipe, equipment and container must first brush anti-rust paint, stay two paint is brushed again before commissioning. For insulation and condensation prevention requirement should brush anti-rust paint.
3.3.1.2 dark piping, equipment and container to brush two antirust paint, the name of the second antirust paint must be the first line of paint brush after dry. And antirust paint consistency to be appropriate.
3.3.1.3 anticorrosive coating of buried pipe, its outer wall corrosion protection layer shall be conducted according to table 1-39.
When winter construction, appropriate USES rubber solvent oil or aviation gasoline melting 30 asphalt or 30 b. The weight ratio: asphalt, gasoline = 1:2.
3.3.2 rainfall distribution on 10-12 anticorrosive coating method has two kinds:
3.3.2.1 manual brushing: manual besmear brushs should be layered coating, each layer should be, reciprocating, maintain uniform coating, shall not leak or flow.
3.3.2.2 machinery coating: coating spray paint flow with spray paint surface vertical, spray paint surface is flat, nozzle and spray paint surface should be 250 ~ 350 mm apart, spray paint surface such as the circular arc surface, nozzle and spray paint surface distance should be about 400 mm. When spraying, the movement of the nozzle should be uniform, speed should be kept in 10 ~ 18 m/min, spray paint using compressed air pressure is 0.2 ~ 0.4 MPa.
3.3.3 of buried pipeline corrosion protection:
Buried pipeline coating is mainly composed of base oil, cold asphalt emperor fat, waterproofing and kraft paper, etc.
3.3.3.1 cold priming oil components are shown in table 1 to 40.
Pipeline anticorrosive coating types - 39 in table 1
Anticorrosion layers of time (normal) from the metal surface coating strengthening anticorrosion coating, anticorrosive coating
1
2
3
4
5
6
7
Coating thickness is not less than (mm)
Priming oil thickness allowable deviation (mm) cold
Asphalt coating
Outsourcing protective layer
3
0.3 adhesive bitumen primer
Asphalt coating
Strengthen the binding layer (seal)
Asphalt coating
Outsourcing protective layer
6
0.5 adhesive bitumen primer
Asphalt coating
Strengthen the protection layer (seal)
Asphalt coating
Strengthen the binding layer (seal)
Asphalt coating
Outsourcing protective layer
9
0.5
Note: 1.
2.
3.
4.
5. Strengthen the bandaged with glass cloth layer, shall apply a cold priming oil seal;
Do anti-corrosion dressing in layers, joint lap length of 30 ~ 50 mm, outsourcing protective layer, lap length of 10 ~ 20 mm;
Not connected intermitting position of interface or construction should be done on each floor contraction of 80 ~ 100 mm stepwise summer-planting;
Besmear brushs anticorrosive priming oil cold should be uniform, thickness is 0.1 ~ 0.15 mm;
Cold priming oil mixture ratio: the weight of the asphalt: gasoline = 1:2.25.
Cold priming oil composition table 1 to 40
Using a piece of asphalt, gasoline (weight ratio) asphalt, gasoline (volume ratio)
In the temperature + 5 ℃ above
The temperature below + 5 ℃ 1:2.25 ~ 2.5
1, 2, 1, 3
1:2.5
The refrigeration priming oil asphalt, asphalt is a brand for 30 architecture. Before stewing, the asphalt into small pieces under 1.5 kg, clean up the pan with asphalt, rising up and stirring, and keep the temperature within the range of 180 ~ 200 ℃ (highest do not exceed 220 ℃), the general should be made under this temperature 1.5 ~ 2.5 hours, until does not produce bubbles, it indicates that the dehydration. According to the mixture will be cooled to 100 ~ 120 ℃ dehydration asphalt slowly in measuring good unleaded gasoline, and keep stirring until completely mixing.
Within 24 hours after cleaning pipe surface brush adhesive bitumen primer, coating should be uniform and the thickness of 0.1 ~ 0.15 mm.
3.3.3.2 emperor of proportion of fat: asphalt asphalt: kaolin = 3:1.
A building asphalt asphalt should be 30 and 10 or 30 armor construction of asphalt mixture. Temperature at 180 ~ 200 ℃ to add dryness and dehydration asphalt heating to 120 ~ 140 ℃ of kaolin, stirring constantly, make its mixed evenly. Softening point and then determine asphalt emperor fat, extension, three technologies such as penetration index, reaches the prescribed in table 1-41 for qualified.
Besmear foam asphalt when emperor fat, its temperature should be kept in 160 ~ 180 ℃, construction temperature is above 30 ℃, the temperature can be reduced to 150 ℃. Hot asphalt emperor grease should be applied in cold dry clean base oil, uniform coating. The innermost asphalt emperor fat as a painted the foam, with artificial or half mechanization should be divided into the second floor, each layer of 1.5 ~ 2 mm thick.
3.3.3.3 waterproofing materials generally USES mineral wool paper linoleum or have a cold glass of priming oil net cloth, spiral wrap bag on the hot asphalt tamar emperor lipid layer, each lap is allowed no greater than 5 mm gap between or take sides, front and back coil of lap length is 80 ~ 100 mm, with hot asphalt emperor fat will glue joint.
Asphalt emperor fat technical indicators table 1-41
Construction temperature
Medium temperature (℃)
(℃) softening point method (global)
(℃) extension degree (+ 25 ℃)
(cm) penetration
(0.1 mm)
- 25 ~ + 5
- 25 ~ + 25
+ 25 ~ + 56
+ 56 ~ + + 56 70 ~ + 75
+ 80 ~ + 90
+ 85 ~ + 90 3 ~ 4
2 ~ 3
2 ~ 3 -
25 to 35
20 ~ 25
+ 5 ~ + 30
- 25 ~ + 25
+ 25 ~ + 56
+ 56 ~ + 70 + 70 ~ + 80
+ 80 ~ + 90
+ 90 ~ + 95 2.5 ~ 3.5
2 ~ 3
1.5 ~ 2.5 15 ~ 25
10 ~ 20
10 ~ 20
More than 30 +
- 25 ~ + 25
+ 25 ~ + 56
+ 56 ~ + 70 + 70 ~ + 90
+ 90 ~ + 95
+ 90 ~ + 95 2 ~ 3
1.5 ~ 2.5
1.5 ~ 2.5 -
10 ~ 20
10 ~ 20
3.3.3.4 wrapped package kraft paper, each lap due on 15 ~ 20 mm, between before and after the two volumes of lap length is not less than 100 mm, joint with hot asphalt emperor fat or cold priming oil glue. Kraft paper, also can use PVC plastic sheeting or no cold glass of priming oil mesh fabric.
3.3.3.5 to make strong anti-corrosion layer, two waterproof coil winding direction should be the opposite.
3.3.3.6 anticorrosive coating of pipe have been made when lifting, should use soft straps or not damaged cords of anticorrosive coating, so as not to damage the coating. Pipe ditch before the mucking, to make bottom level off, without stone, brick and tile or other debris. Upper if very hard, should be in the groove bedding 100 mm soft fine soil, under the pipe ditch, forbid to use crowbar tube, more may not be directly push pipe trench.
3.3.3.7 anticorrosive coating on all defects, unqualified place and ditches under inspection and damaged parts, repair should be before the trench backfilling, backfill, appropriate to use a layer of fine soil backfilled, buried pipe roof, and then with artificial or mechanical backfill.
4 quality standards
4.1 ensure projects:
4.4.1 of buried pipeline coating shall meet the following requirements:
Material and structure in accordance with the rules and regulations of the design requirements and construction. Coil and pipe and stickup and firm, between each layer coil surface level off, without buckling, empty drum, defects such as sliding and sealing is lax.
Test method: to observe the cut or coating inspection.
4.1.2 pipeline, box type and metal stents painting shall meet the following requirements:
Times comply with the design requirements, types and besmear brushs paint adhesion is good, without peeling, blister and the coating, the film thickness uniformity, colour and lustre is consistent, no flow drop and pollution phenomenon.
Inspection method: to observe the examination.
5 finished product protection
5.1 anticorrosion coating of pipeline and equipment has been completed to be separated, not adhesion, lest destroy the anti-corrosion layer.
5.2 oil brush to clean up the surrounding environment before, to prevent the dust float in the sky, keep clean, in case of strong wind, rain, fog, snow can not open.
5.3 paint of piping, equipment and containers, lacquer layer in the process of drying should prevent freezing, impact, vibration and temperature, radical changes.
6 should pay attention to quality problems
6.1 pipe surface peeling rust and return. The main reason is not pipe derusting net.
6.2 pipe, equipment and container, uneven surface paint flow falling or leakage phenomenon, mainly oil brush with paint too much and not serious.
7 should possess the quality of the record
7.1 anti-rust paint, paint, asphalt material such as dolphin diluent should have the factory certificate.
7.2 should approach the acceptance record.
7.3 before the pipeline and equipment anticorrosion engineering records.
7.4 after the completion of the acceptance record.
No comments:
Post a Comment