CN214718016U

CN214718016U - Equipment system for manufacturing protective petroleum steel pipe

Info

Publication number: CN214718016U
Application number: CN202120024431.7U
Authority: CN
Inventors: 王启阳; 王进坚
Original assignee: Wuxi Chengerxin Environmental Protection Equipment Technology Co ltd
Current assignee: Wuxi Chengerxin Environmental Protection Equipment Technology Co ltd
Priority date: 2021-01-06
Filing date: 2021-01-06
Publication date: 2021-11-16
Anticipated expiration: 2031-01-06

Abstract

The utility model belongs to the technical field of the new material is used, especially, relate to an equipment system that protection type oil steel pipe was made. The equipment system for manufacturing the protective petroleum steel pipe comprises a steel pipe inspection and material preparation system, a first clean room, a second clean room, a third clean room and a product inspection system. The equipment system takes a common petroleum steel pipe as a base material, applies a surface treatment engineering technology, uniformly coats a modified polyphenylene sulfide material on the surface of the inner wall of the pipe body, and uniformly coats a modified polyphenylene sulfide or modified epoxy phenolic material on the surface of the outer wall of the pipe body to manufacture the protective petroleum steel pipe, thereby meeting the comprehensive functional requirements of corrosion resistance, scale prevention, wax precipitation prevention, wear resistance, high temperature resistance, long service life and the like of the petroleum steel pipe, and being suitable for the market demand of conveying pipelines for oil, gas and water media or other industry corrosive media in the fields of petroleum and natural gas.

Description

Equipment system for manufacturing protective petroleum steel pipe

Technical Field

The utility model belongs to the technical field of the new material is used, especially, relate to an equipment system that protection type oil steel pipe was made.

Background

In the field of petroleum and natural gas, a petroleum steel pipe relates to the functional requirements of corrosion resistance, scale formation resistance, wax deposition resistance, wear resistance and the like, but the common petroleum steel pipe obviously does not have the functions, the common petroleum steel pipe has short service life and high maintenance and updating cost due to corrosion, scale formation, wax deposition, wear and the like, and even the normal production of an oil-gas field is influenced due to the fact that a pipeline is blocked by the scale formation or the wax deposition, and the high-sulfur oil-gas field also has environmental and potential safety hazards.

The existing used petroleum steel pipes mainly comprise common petroleum steel pipes, stainless steel pipes, steel pipes internally lined with epoxy phenolic materials and the like. The stainless steel pipe is not only expensive, but also has selective corrosion resistance, and the corrosion resistance is influenced under the environment of high temperature, high carbon dioxide content, high hydrogen sulfide content and high chloride ion content, and the stainless steel pipe does not have the functions of scale prevention and wax precipitation prevention; the steel pipe with the inner lining made of the epoxy phenolic material has the defects of bubbling, delaminating, embrittling, poor adhesive force and the like in a short time in a medium with the temperature of more than 100 ℃ and high content of hydrogen sulfide, carbon dioxide, chloride ions and the like, and the damaged lining layer has no repairability and the application range is limited.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defect that exists among the background art, the utility model provides a technical scheme that its technical problem adopted is: the utility model provides an equipment system that protection type oil steel pipe was made, its characterized in that, including steel pipe inspection system of prepareeing material, clean room one, clean room two, clean room three and product inspection system, its characterized in that: the steel pipe inspection and material preparation system is characterized in that a trolley I, a carbonization furnace device, a trolley II, a steel pipe conveying device I, a pipe body rolling and polishing device, a steel pipe conveying device II, a pipe body sand blasting device, a steel pipe conveying device III, a pipe body cleaning device, a steel pipe conveying device IV, a preheating furnace device and a steel pipe conveying device V are sequentially arranged between the steel pipe inspection and material preparation system I, a coating device I, a curing furnace device I and a steel pipe conveying device VII are sequentially arranged between the clean room I and the clean room II, a coating device II is arranged in the clean room II, a pipe conveying device VIII, a curing furnace device II, a steel pipe conveying device IX, a cooling bed device I, a steel pipe conveying device eleven, an intermediate-frequency heating device and a steel pipe conveying device eleven are sequentially arranged between the clean room II and the clean room III, a coating device III is arranged in the clean room III, and a product inspection system is sequentially arranged between the clean room III and the steel pipe conveying device III, The product inspection system is connected with the unqualified steel pipe returning device through a steel pipe conveyor fourteen.

Preferably, a quenching device I and a hot air drying device are respectively arranged on two sides of the cooling bed device I; the first cooling bed device, the first quenching device and the hot air drying device form a tunnel type pipe body cooling and drying device combination, and the pipe body cooling temperature is obtained through the combination: the temperature of the pipe body is less than or equal to 180 +/-5 ℃, meanwhile, the surface of the pipe body is completely dried, the quenching device rapidly cools the pipe body arranged on the first cooling bed device in a water spraying mode, the hot air drying device uniformly sweeps, dehydrates and dries the surface of the pipe body arranged on the first cooling bed device by utilizing heated air, the quenching devices II are arranged on two sides of the second cooling bed device, and the second cooling bed device and the quenching devices II are combined to form a tunnel type pipe body cooling device.

Preferably, the carbonization furnace device, the preheating furnace device, the first coating device, the first curing furnace device, the second coating device, the second curing furnace device and the third coating device are respectively connected with the waste gas purification device.

The preferable steel pipe inspection and material preparation system is used for steel pipe flaw detection and pressure resistance detection; the carbonization furnace device is used for cleaning complete carbonization equipment of oil and organic dirt attached to the surface of the steel pipe, and the carbonization temperature of the carbonization furnace device is 400 +/-5 ℃; the complete equipment for removing the carbonized scale and the rust scale on the surface of the inner wall and the outer wall of the tube body by the tube body rolling and polishing device is characterized in that the surface cleanliness of the tube body after being processed by the tube body rolling and polishing device is as follows: sa is less than or equal to 3.5; the pipe body sand blasting device is complete equipment for descaling and derusting the inner wall and the outer wall of the pipe body and forming surface roughness through a high-pressure airflow sand blasting pill, and the working air pressure of the pipe body sand blasting device is as follows: 0.8-1.0 MPa, and the surface roughness of the tube body after being treated by the tube body sand blasting device is as follows: ra 70-90 μm; the pipe body cleaning device is a complete set of equipment for removing dust particles on the surface of the pipe body by adopting high-pressure air flow or dry ice, the working air pressure of the pipe body cleaning device is 0.6-0.8 MPa, and the cleanliness of the surface of the pipe body is treated by the pipe body cleaning device: sa is less than or equal to 2.5.

Preferably, the first coating device and the second coating device are coating devices for selectively coating powder, liquid, colloid and solid-liquid mixture coating materials on the inner wall of the pipe body, the coating thickness of the materials formed by the first coating device and the second coating device is 150-500 mu m, and the surface hardness of a material coating surface layer is 5-6H.

Preferably, the third coating device is a coating device for selectively coating the powder, liquid, colloid and solid-liquid mixture coating material on the outer wall of the tube body, the coating thickness of the material formed by the third coating device is 200-300 mu m, and the surface hardness of the material coating is 5-6H.

Preferably, the first curing oven device and the second curing oven device are heating constant temperature equipment for curing the coating material on the inner wall of the tube body, the working temperature range of the first curing oven device is 350 +/-5 ℃, the curing degree of the coating material can reach 50-70% through the first curing oven device, the working temperature range of the second curing oven device is 250-350 ℃, and the coating material can be completely cured.

Preferably, a direct current spark detector for detecting leak points and pin holes, a hardness meter for detecting hardness, an impact resistance instrument for detecting impact resistance, an adhesion force instrument for detecting adhesion force performance, a shakeout abrasion resistance tester for detecting erosion and wear resistance, an electronic probe instrument for detecting components of the coating layer and a magnetic thickness gauge for detecting thickness are arranged in the product detection system.

Preferably, the preheating furnace device is a tube body heating thermostatic device, and the working temperature range of the preheating furnace device is as follows: 90-200 ℃; the medium-frequency heating device is used for heating the outer wall of the pipe body and can heat the surface of the outer wall of the pipe body to 90-200 ℃; the electrothermal curing device is a constant-temperature heating device for coating materials on the outer wall of the tube body, and the working temperature range of the electrothermal curing device is as follows: and (3) completely curing the coating material on the outer wall of the tube body at 100-350 ℃.

Preferably, the material uniformly coated on the surface of the inner wall of the pipe body by the first coating device and the second coating device is modified polyphenylene sulfide, the material uniformly coated on the surface of the outer wall of the pipe body by the third coating device is modified polyphenylene sulfide or modified epoxy phenolic material, and the surfaces of the inner wall and the outer wall of the pipe body base material are all uniformly covered by the coating material to form a complete surface protective layer.

In order to overcome prior art's not enough, the utility model provides an equipment system that protection type oil steel pipe was made, this equipment system uses ordinary oil steel pipe as the substrate, use surface treatment engineering technique, at the even modified polyphenylene sulfide material of coating of body inner wall surface, at the even modified polyphenylene sulfide of coating of body outer wall surface or modified epoxy phenolic material, make protection type oil steel pipe, thereby it is corrosion-resistant to satisfy the oil steel pipe, prevent the scale deposit, prevent the wax precipitation, stand wear and tear, high temperature resistance, comprehensive functional requirement such as long service life, the adaptation oil, the natural gas field carries oil gas aqueous medium or other trade corrosive medium pipeline's market demand.

The utility model provides an equipment system that protection type oil steel pipe was made still has following beneficial effect:

1. the surface treatment engineering technology is applied to the common petroleum steel pipe serving as a base material, and the micron-sized modified polyphenylene sulfide material is uniformly coated on the surface of the inner wall of the pipe body, so that the defects of easy corrosion, easy scaling, easy wax deposition, easy abrasion, short service life and the like of the common petroleum steel pipe in use are overcome.

2. The surface of the pipe body processed by the equipment system is uniformly coated with micron-sized modified polyphenylene sulfide and modified epoxy phenolic aldehyde (outer wall) materials, so that the manufactured protective steel pipe prolongs the service cycle of the petroleum steel pipe, improves the production efficiency and saves the production cost.

3. The service life of the protective petroleum steel pipe treated by the equipment system is prolonged by more than 5 times compared with that of a common petroleum steel pipe, the consumption of the common petroleum steel pipe is reduced for at least 4 times, and the equipment system has the advantage of obviously saving steel resources.

4. The steel pipe processed by the equipment system is suitable for long-term use under the environmental conditions of high temperature below 204 ℃, high carbon dioxide content, high hydrogen sulfide content, high chloride ion content, high mixed-phase salt content and the like, and is hydrogen sulfide and hydrogen embrittlement resistant, thereby overcoming the defects of the prior art.

5. The steel pipe modified polyphenylene sulfide treated by the equipment system has the adhesion grade of 1 grade with the surface of a pipe body base material, the surface is flat and smooth, the friction coefficient is small, the hydrophobicity is good, the self-lubricating property is good, the scale and wax are prevented, the medium conveying resistance is small, the steel pipe modified polyphenylene sulfide has the corrosion resistance to most of acids, alkalis, salts and organic solvents, the shakeout wear resistance is more than or equal to 40L/mu m, (5.4L/mu m of epoxy phenol and 6.2L/mu m of ceramic material), the steel pipe modified polyphenylene sulfide has high wear resistance, the shock resistance is more than or equal to 5J, the steel pipe modified polyphenylene sulfide has shock resistance, and no microcrack and delamination occur under the condition of bearing the tensile stress of 80% steel yield limit.

6. The surface of the steel pipe body processed by the equipment system is coated with micron-sized modified polyphenylene sulfide, and the surface damage has repairability in the use process.

Drawings

The present invention will be further explained with reference to the drawings and examples.

FIG. 1 is a process flow diagram of an equipment system for manufacturing protective petroleum steel pipes according to the present invention;

wherein 1, a steel pipe inspection and preparation system; 2. a first trolley; 3. a retort device; 4. a second trolley; 5. a first steel pipe conveying device; 6. a pipe body rolling and polishing device; 7. a second steel pipe conveying device; 8. a pipe body sand blasting device; 9. a third steel pipe conveying device; 10. a pipe body cleaning device; 11. a fourth steel pipe conveying device; 12. a preheating furnace device; 13. a fifth steel pipe conveying device; 14. a first coating device; 15. a first clean room; 16. a steel pipe conveying device six; 17. a first curing oven device; 18. a steel pipe conveying device seven; 19. a second coating device; 20. a second clean room; 21. a steel pipe conveying device eight; 22. a second curing oven device; 23. a steel pipe conveying device nine; 24. a first cooling bed device; 25. a first quenching device; 26. a hot air drying device; 27. a steel pipe conveying device ten; 28. a medium-frequency heating device; 29. eleven steel pipe conveying devices; 30. a third coating device; 31. a clean room III; 32. a steel pipe conveying device twelve; 33. an electrothermal curing device; 34. a second cooling bed device; 35. a second quenching device; 36. a steel pipe receiving device; 37. a product inspection system; 38. thirteen steel pipe conveying devices; 39. a steel pipe marking device; 40. fourteen steel tube conveying devices; 41. an unqualified steel pipe receiving device; 42. an exhaust gas purification device.

Detailed Description

The present invention will now be described in further detail with reference to the accompanying drawings. The attached drawings are simplified schematic diagrams, and merely illustrate the basic structure of the present invention in a schematic manner, and thus show only the components related to the present invention.

In a specific embodiment, referring to fig. 1, an equipment system for manufacturing a protective petroleum steel pipe is characterized by comprising a steel pipe inspection material preparation system 1, a first clean room 15, a second clean room 20, a third clean room 31 and a product inspection system 37, wherein a trolley I2, a carbonization furnace device 3, a trolley II 4, a steel pipe conveying device I5, a pipe body rolling and polishing device 6, a steel pipe conveying device II 7, a pipe body sand blasting device 8, a steel pipe conveying device III 9, a pipe body cleaning device 10, a steel pipe conveying device IV 11, a preheating furnace device 12 and a steel pipe conveying device V13 are sequentially arranged between the steel pipe inspection material preparation system 1 and the first clean room 15, a coating device I14 is arranged in the clean room I15, a steel pipe conveying device VI 16, a curing furnace device I17 and a steel pipe conveying device VII are sequentially arranged between the clean room I15 and the clean room II 20, a coating device II 19 is arranged in the clean room II 20, eight 21 pipe conveying devices, two 22 curing furnace devices, nine 23 steel pipe conveying devices, one 24 cooling bed devices, ten 27 steel pipe conveying devices, 28 intermediate frequency heating devices and eleven 29 steel pipe conveying devices are sequentially arranged between the second clean room 20 and the third clean room 31, three 30 coating devices are arranged in the third clean room 31, twelve 32 steel pipe conveying devices, 33 electrothermal curing devices, two 34 cooling bed devices and 36 steel pipe receiving devices are sequentially arranged between the third clean room 31 and the product inspection system 37, the product inspection system 37 is connected with a steel pipe marking device 39 through thirteen 38 steel pipe conveying devices, the product inspection system 37 is connected with an unqualified steel pipe returning device 41 through a fourteen 40 steel pipe conveying device, and a first quenching device 25 and a hot air drying device 26 are respectively arranged on two sides of the first cooling bed device 24; the cooling bed device 24, the quenching device 25 and the hot air drying device 26 form a tunnel type pipe cooling and drying device combination, and the combination enables the pipe cooling temperature to be as follows: the temperature is less than or equal to 180 +/-5 ℃, the surface of the pipe body is completely dried at the same time, the first quenching device 25 rapidly cools and cools the pipe body on the first cooling bed device 24 in a water spraying mode, the hot air drying device 26 uniformly sweeps and dehydrates and dries the surface of the pipe body on the first cooling bed device 24 by using heated air, the second quenching devices 35 are arranged on two sides of the second cooling bed device 34, the second cooling bed device 34 and the second quenching devices 35 are combined to form a tunnel-type pipe body cooling device, the carbonization furnace device 3, the preheating furnace device 12, the first coating device 14, the first curing furnace device 17, the second coating device 19, the second curing furnace device 22 and the third coating device 30 are respectively connected with the waste gas purification device 42, and the steel pipe inspection and material preparation system 1 is used for steel pipe flaw detection and pressure resistance detection; the carbonization furnace device 3 is complete carbonization equipment used for removing oil and organic dirt attached to the surface of the steel pipe body, and the carbonization temperature of the carbonization furnace device 3 is 400 +/-5 ℃; the tube body rolling and polishing device 6 is complete equipment for removing carbonized scale and rusty scale on the surface of the inner wall and the outer wall of the tube body, and the surface cleanliness of the tube body after being processed by the tube body rolling and polishing device 6 is as follows: sa is less than or equal to 3.5; the pipe body sand blasting device 8 is complete equipment for descaling and derusting the inner wall and the outer wall of the pipe body and forming surface roughness through a high-pressure airflow sand blasting pill, and the working air pressure of the pipe body sand blasting device 8 is as follows: 0.8 ~ 1.0MPa, body surface roughness is after 8 processing of body sand blasting unit: ra 70-90 μm; the pipe body cleaning device (10) is a complete set of equipment for removing dust particles on the surface of the pipe body by adopting high-pressure air flow or dry ice, the working air pressure of the pipe body cleaning device (10) is 0.6-0.8 MPa, and the cleanliness of the surface of the pipe body after being processed by the pipe body cleaning device (10) is as follows: sa is less than or equal to 2.5, the first coating device 14 and the second coating device 19 are coating devices for selectively coating powder, liquid, colloid and solid-liquid mixture coating materials on the inner wall of the pipe body, the coating thickness of the materials formed by the first coating device 14 and the second coating device 19 is 150-500 mu m, the surface hardness of the coating surface layer of the materials is 5-6H, the third coating device 30 is a coating device for selectively coating powder, liquid, colloid and solid-liquid mixture coating materials on the outer wall of the pipe body, the coating thickness of the materials formed by the third coating device 30 is 200-300 mu m, the surface hardness of the materials coated is 5-6H, the first curing furnace device 17 and the second curing furnace device 22 are heating constant-temperature equipment for curing the coating materials on the inner wall of the pipe body, the working temperature range of the first curing furnace device 17 is 350 +/-5 ℃, the first curing furnace device 17 can enable the curing degree of the coating materials to reach 50-70%, the second curing furnace device 22 has a working temperature range of 250-350 ℃, can completely cure the coating material, is provided with a direct current spark detector for detecting leak points and pinholes, a hardness tester for detecting the hardness, an impact resistance instrument for detecting the impact resistance, an adhesion force instrument for detecting the adhesion force performance, a sand falling abrasion tester for detecting the erosion abrasion resistance, an electronic probe instrument for detecting the components of the coating layer and a magnetic thickness gauge for detecting the thickness, and is characterized in that the preheating furnace device 12 is a pipe body heating constant temperature device, and the preheating furnace device 12 has a working temperature range of: 90-200 ℃; the medium-frequency heating device 28 is used for heating the outer wall of the pipe body, and the medium-frequency heating device 28 can heat the surface of the outer wall of the pipe body to 90-200 ℃; the electrothermal curing device 33 is a constant temperature heating device for coating material on the outer wall of the tube body, and the working temperature range of the electrothermal curing device 33 is as follows: the temperature of 100-350 ℃ is ensured to be completely cured, the materials uniformly coated on the surface of the inner wall of the pipe body by the first coating device 14 and the second coating device 19 are modified polyphenylene sulfide, the materials uniformly coated on the surface of the outer wall of the pipe body by the third coating device 30 are modified polyphenylene sulfide or modified epoxy phenolic, and the surfaces of the inner wall and the outer wall of the pipe body base material are completely and uniformly covered by the coating materials to form a complete surface protective layer.

The utility model provides an equipment system that protection type oil steel pipe was made, this equipment system uses ordinary oil steel pipe as the substrate, use surface treatment engineering technique, at the even modified polyphenylene sulfide material of coating in body inner wall surface, at the even modified polyphenylene sulfide of coating in body outer wall surface or modified epoxy phenolic material, make protection type oil steel pipe, thereby it is corrosion-resistant to satisfy the oil steel pipe, prevent the scale deposit, prevent the wax precipitation, stand wear and tear, high temperature resistant, comprehensive functional requirements such as long service life, adapt to the oil, the market demand of oil gas aqueous medium or other trade corrosion medium pipeline is carried in the natural gas field.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications can be made without departing from the scope of the invention.

Claims

1. The utility model provides an equipment system that protection type oil steel pipe was made, includes steel pipe inspection stock preparation system (1), clean room one (15), clean room two (20), clean room three (31) and product inspection system (37), its characterized in that: be equipped with between steel pipe inspection system of prepareeing material (1) and toilet (15) in proper order trolley one (2), retort device (3), trolley two (4), steel pipe conveyor (5), body roll throw device (6), steel pipe conveyor two (7), body sand blasting unit (8), steel pipe conveyor three (9), body cleaning device (10), steel pipe conveyor four (11), preheater device (12) and steel pipe conveyor five (13), be equipped with coating device one (14) in toilet one (15), be equipped with steel pipe conveyor six (16), curing oven device one (17) and steel pipe conveyor seven (18) between toilet one (15) and toilet two (20) in proper order, be equipped with coating device two (19) in toilet two (20), be equipped with steel pipe conveyor eight (21) between toilet two (20) and the toilet three (31) in proper order, The device comprises a second curing oven device (22), a ninth steel tube conveying device (23), a first cooling bed device (24), a tenth steel tube conveying device (27), an intermediate frequency heating device (28) and an eleventh steel tube conveying device (29), wherein a third coating device (30) is arranged in a third clean room (31), a twelfth steel tube conveying device (32), an electrothermal curing device (33), a second cooling bed device (34) and a steel tube receiving device (36) are sequentially arranged between the third clean room (31) and a product inspection system (37), the product inspection system (37) is connected with a steel tube marking device (39) through a thirteenth steel tube conveyor (38), and the product inspection system (37) is connected with an unqualified steel tube returning device (41) through a fourteenth steel tube conveyor (40).

2. The equipment system for manufacturing the protective petroleum steel pipe according to claim 1, wherein: a first quenching device (25) and a hot air drying device (26) are respectively arranged on two sides of the first cooling bed device (24); the first cooling bed device (24), the first quenching device (25) and the hot air drying device (26) form a tunnel type pipe body cooling and drying device combination, and the combination enables the pipe body cooling temperature to be as follows: the temperature of the pipe body is less than or equal to 180 +/-5 ℃, meanwhile, the surface of the pipe body is completely dried, the first quenching device (25) rapidly cools the pipe body arranged on the first cooling bed device (24) in a water spraying mode, the hot air drying device (26) uniformly sweeps, dehydrates and dries the surface of the pipe body arranged on the first cooling bed device (24) by using heated air, the second quenching device (35) is arranged on two sides of the second cooling bed device (34), and the second cooling bed device (34) and the second quenching device (35) are combined to form a tunnel type pipe body cooling device.

3. The equipment system for manufacturing the protective petroleum steel pipe according to claim 1, wherein: the carbonization furnace device (3), the preheating furnace device (12), the first coating device (14), the first curing furnace device (17), the second coating device (19), the second curing furnace device (22) and the third coating device (30) are respectively connected with the waste gas purification device (42).

4. The equipment system for manufacturing the protective petroleum steel pipe according to claim 1, wherein: the steel pipe inspection and material preparation system (1) is used for steel pipe flaw detection and pressure resistance detection; the carbonization complete equipment is characterized in that the carbonization furnace device (3) is used for removing oil and organic dirt attached to the surface of the steel pipe body, and the carbonization temperature of the carbonization furnace device (3) is 400 +/-5 ℃; the tube body rolling and polishing device (6) is complete equipment for removing carbonized scale and rusty scale on the surfaces of the inner wall and the outer wall of the tube body, and the surface cleanliness of the tube body after being processed by the tube body rolling and polishing device (6) is as follows: sa is less than or equal to 3.5; the complete equipment for descaling and derusting the inner wall and the outer wall of the pipe body and forming surface roughness is characterized in that the pipe body sand blasting device (8) performs high-pressure air flow sand blasting to remove scale and rust on the inner wall and the outer wall of the pipe body, and the working air pressure of the pipe body sand blasting device (8) is as follows: 0.8 ~ 1.0MPa, body surface roughness is after body sand blasting unit (8) are handled: ra 70-90 μm; the pipe body cleaning device (10) is a complete set of equipment for removing dust particles on the surface of the pipe body by adopting high-pressure air flow or dry ice, the working air pressure of the pipe body cleaning device (10) is 0.6-0.8 MPa, and the cleanliness of the surface of the pipe body is obtained after the pipe body cleaning device (10) is used for processing: sa is less than or equal to 2.5.

5. The equipment system for manufacturing the protective petroleum steel pipe according to claim 1, wherein: the first coating device (14) and the second coating device (19) are coating devices for selectively coating powder, liquid, colloid and solid-liquid mixture coating materials on the inner wall of the tube body, the coating thickness of the materials formed by the first coating device (14) and the second coating device (19) is 150-500 mu m, and the surface hardness of the material coating surface layer is 5-6H.

6. The equipment system for manufacturing the protective petroleum steel pipe according to claim 1, wherein: the third coating device (30) is a coating device for selectively coating the powder, liquid, colloid and solid-liquid mixture coating material on the outer wall of the tube body, the coating thickness of the material formed by the third coating device (30) is 200-300 mu m, and the surface hardness of the material coating is 5-6H.

7. The equipment system for manufacturing the protective petroleum steel pipe according to claim 1, wherein: the first curing oven device (17) and the second curing oven device (22) are heating constant temperature equipment for curing the coating material on the inner wall of the tube body, the working temperature range of the first curing oven device (17) is 350 +/-5 ℃, the first curing oven device (17) can enable the curing degree of the coating material to reach 50% -70%, and the working temperature range of the second curing oven device (22) is 250-350 ℃, so that the coating material can be completely cured.

8. The equipment system for manufacturing the protective petroleum steel pipe according to claim 1, wherein: the product inspection system (37) is internally provided with a direct current spark detector for inspecting leak points and pin holes, a hardness meter for detecting the hardness, an impact resistance instrument for detecting the impact resistance strength, an adhesive force instrument for detecting the adhesive force performance, a shakeout abrasion resistance tester for detecting the erosion and abrasion resistance performance, an electronic probe instrument for detecting components of the coating layer and a magnetic thickness gauge for detecting the thickness.

9. The equipment system for manufacturing the protective petroleum steel pipe according to claim 1, wherein: the preheating furnace device (12) is a pipe body heating constant temperature equipment, and the working temperature range of the preheating furnace device (12) is as follows: 90-200 ℃; the medium-frequency heating device (28) is used for heating the outer wall of the pipe body, and the medium-frequency heating device (28) can heat the surface of the outer wall of the pipe body to 90-200 ℃; the electrothermal curing device (33) is a constant-temperature heating device for coating materials on the outer wall of the tube body, and the working temperature range of the electrothermal curing device (33) is as follows: and (3) completely curing the coating material on the outer wall of the tube body at 100-350 ℃.

10. The equipment system for manufacturing the protective petroleum steel pipe according to claim 1, wherein: the material uniformly coated on the surface of the inner wall of the pipe body by the first coating device (14) and the second coating device (19) is modified polyphenylene sulfide, the material uniformly coated on the surface of the outer wall of the pipe body by the third coating device (30) is modified polyphenylene sulfide or modified epoxy phenolic material, and the surfaces of the inner wall and the outer wall of the pipe body base material are completely and uniformly covered by the coating material to form a complete surface protection layer.