When high-pressure fiberglass pipelines are used in oilfield ground pipelines and water injection pipelines, different calculation formulas shall be used to calculate the pressure drop of the pipelines and perform strength calculation according to the different media being transported. In addition, when designing glass fiber pipe, attention should be paid to the following issues.
11 Chemical Applicability (1) Determine the material and curing of the pipe according to the "Technical Data Sheet for Mechanical and Chemical Resistance of FRP Pipes" supplied by the manufacturer of glass-fiber reinforced plastic pipes and the composition, characteristics, temperature, and pressure of the medium to be transported through the pipe. Agent system. In particular, pipelines that transport oil and gas must use epoxy resin pipelines; fluids containing more than 3% CO2 must use fully aromatic amine-cured epoxy pipes regardless of temperature.
(2) The transmission of strongly corrosive media must use a fully aromatic amine-cured epoxy resin pipe.
(3) The inner wall of the pipeline for natural gas or highly corrosive media must have a full-epoxy epoxy liner that is at least 0125 mm thick to ensure the chemical resistance of the pipeline.
(4) In principle, it is not allowed to perform a large number of operations such as corrosion inhibitor, pickling, or caustic washing on glass fiber reinforced plastics.
21 Physical characteristics (1) The working pressure of the manufacturer's calibration is equal to the actual test limit breaking pressure and the ratio of the safety factor selected by the manufacturer. The nominal pressure rating of FRP tubes in the product sample is a calculated value, not a measured value. Similarly, the pressure-breaking tubes will exhibit different pressure ratings due to the manufacturer's safety factor (not less than 215). Therefore, comparing the rated pressure alone does not guarantee the correct selection. According to the actual situation, the model should be selected with higher safety factor and better material grade to ensure long-term safe use. This is a very necessary safety and security measure.
(2) The safety factor of the product must be calibrated and the internal pressure of the ultimate destruction must be calibrated. At the same time, the glass steel pipe manufacturer may issue a destructive pressure test report verified by a third party organization and the glass pipe must pass 115 times the rated working pressure before leaving the factory. Test, this is the best protection for users.
(3) Since FRP material is a brittle material, its joint strength is very critical, and its strength must be higher than the mechanical strength of the pipe body, so the safety factor of the joint must not be lower than 310.
(4) The sewage pipeline can be threaded or socket-bonded. Oil and gas transmission pipelines can only be used for socket joint bonding to ensure the tightness and strength of the connection.
31 Temperature characteristics (1) The transport of high-temperature fluids must use epoxy resin pipes that are fully aromatic amine-cured at high temperatures.
(2) The rated working pressure of FRP pipe will decrease with the increase of operating temperature. FRP pipe manufacturers should provide corresponding temperature and pressure drop comparison tables for design use.
(3) The glass transition temperature of FRP pipe must be clearly demarcated.
For example: The glass transition temperature of the anhydride-cured glass tube must not be lower than 120°C, and the glass transition temperature of the aromatic amine-cured glass tube should not be lower than 130°C.
41 Connections (1) Flange connections are used for the connection of FRP pipes to valves, meters, steel pipes and other equipment.
(2) Threaded connection is divided into integral threaded connection and pipe hoop connection, suitable for connection of small diameter (DN200 or less) pipes.
(3) Socket joints are suitable for pipe connections of medium, high pressure and complex loads in various calibers.
51 Other Precautions (1) The glass fiber reinforced plastic pipeline is suitable for areas where the terrain is relatively flat and the soil is corrosive. It is not suitable for large-scale vehicles, dense population, many underground structures, and multi-angled cornerstone areas.
(2) When crossing railways, roads, and drains, steel casing protection shall be added. If multiple pipelines cross together, one centralizer should be set every 3m to separate the glass steel pipe from the steel casing to prevent pipelines from occurring. Friction, causing mechanical damage.
(3) Whether the thrust seat is designed at the pipe fitting is determined by calculation. If the pipeline needs to install a thrust seat, the thrust seat should be cast after the pipe has undergone static pressure testing. When compacting concrete, keep a distance of at least 5cm between the vibrator and the tube and fittings.
(4) The design of glass fiber reinforced plastic pipe roof buried depth is not less than 110m. After passing through the marshes and stagnant areas, if the backfill soil can not meet the requirements for stability control, anchorage blocks, sand bags, etc. should be set up to stabilize the pipeline.
(5) Multiple pipelines are to be laid in the same trench. The net distance between them should not be less than 150mm. Sand or soft soil should be used between the pipelines.
(6) When the glass fiber reinforced plastic pipe is laid crosswise with other pipes, the glass fiber reinforced plastic pipe shall pass through from below, and the net distance between them shall be greater than the diameter of the fiberglass pipe; if it can only be crossed from the upper part of the horizontal pipe, the net distance between them should be more than 200mm.
(7) FRP pipes should be aligned with the male direction of the pipe in the direction of medium flow.
(8) It is not recommended to use pneumatic pressure test on the pipeline. When using the hydrostatic pressure test, use a soft pigging ball to discharge all the air in the tube. The test pressure is 1125 times the design pressure.
(9) If the glass-fiber reinforced plastic pipe is to be installed on the ground and exposed to sunlight for a long time, it must be made of glass fiber reinforced plastic with ultraviolet protection function.
11 Chemical Applicability (1) Determine the material and curing of the pipe according to the "Technical Data Sheet for Mechanical and Chemical Resistance of FRP Pipes" supplied by the manufacturer of glass-fiber reinforced plastic pipes and the composition, characteristics, temperature, and pressure of the medium to be transported through the pipe. Agent system. In particular, pipelines that transport oil and gas must use epoxy resin pipelines; fluids containing more than 3% CO2 must use fully aromatic amine-cured epoxy pipes regardless of temperature.
(2) The transmission of strongly corrosive media must use a fully aromatic amine-cured epoxy resin pipe.
(3) The inner wall of the pipeline for natural gas or highly corrosive media must have a full-epoxy epoxy liner that is at least 0125 mm thick to ensure the chemical resistance of the pipeline.
(4) In principle, it is not allowed to perform a large number of operations such as corrosion inhibitor, pickling, or caustic washing on glass fiber reinforced plastics.
21 Physical characteristics (1) The working pressure of the manufacturer's calibration is equal to the actual test limit breaking pressure and the ratio of the safety factor selected by the manufacturer. The nominal pressure rating of FRP tubes in the product sample is a calculated value, not a measured value. Similarly, the pressure-breaking tubes will exhibit different pressure ratings due to the manufacturer's safety factor (not less than 215). Therefore, comparing the rated pressure alone does not guarantee the correct selection. According to the actual situation, the model should be selected with higher safety factor and better material grade to ensure long-term safe use. This is a very necessary safety and security measure.
(2) The safety factor of the product must be calibrated and the internal pressure of the ultimate destruction must be calibrated. At the same time, the glass steel pipe manufacturer may issue a destructive pressure test report verified by a third party organization and the glass pipe must pass 115 times the rated working pressure before leaving the factory. Test, this is the best protection for users.
(3) Since FRP material is a brittle material, its joint strength is very critical, and its strength must be higher than the mechanical strength of the pipe body, so the safety factor of the joint must not be lower than 310.
(4) The sewage pipeline can be threaded or socket-bonded. Oil and gas transmission pipelines can only be used for socket joint bonding to ensure the tightness and strength of the connection.
31 Temperature characteristics (1) The transport of high-temperature fluids must use epoxy resin pipes that are fully aromatic amine-cured at high temperatures.
(2) The rated working pressure of FRP pipe will decrease with the increase of operating temperature. FRP pipe manufacturers should provide corresponding temperature and pressure drop comparison tables for design use.
(3) The glass transition temperature of FRP pipe must be clearly demarcated.
For example: The glass transition temperature of the anhydride-cured glass tube must not be lower than 120°C, and the glass transition temperature of the aromatic amine-cured glass tube should not be lower than 130°C.
41 Connections (1) Flange connections are used for the connection of FRP pipes to valves, meters, steel pipes and other equipment.
(2) Threaded connection is divided into integral threaded connection and pipe hoop connection, suitable for connection of small diameter (DN200 or less) pipes.
(3) Socket joints are suitable for pipe connections of medium, high pressure and complex loads in various calibers.
51 Other Precautions (1) The glass fiber reinforced plastic pipeline is suitable for areas where the terrain is relatively flat and the soil is corrosive. It is not suitable for large-scale vehicles, dense population, many underground structures, and multi-angled cornerstone areas.
(2) When crossing railways, roads, and drains, steel casing protection shall be added. If multiple pipelines cross together, one centralizer should be set every 3m to separate the glass steel pipe from the steel casing to prevent pipelines from occurring. Friction, causing mechanical damage.
(3) Whether the thrust seat is designed at the pipe fitting is determined by calculation. If the pipeline needs to install a thrust seat, the thrust seat should be cast after the pipe has undergone static pressure testing. When compacting concrete, keep a distance of at least 5cm between the vibrator and the tube and fittings.
(4) The design of glass fiber reinforced plastic pipe roof buried depth is not less than 110m. After passing through the marshes and stagnant areas, if the backfill soil can not meet the requirements for stability control, anchorage blocks, sand bags, etc. should be set up to stabilize the pipeline.
(5) Multiple pipelines are to be laid in the same trench. The net distance between them should not be less than 150mm. Sand or soft soil should be used between the pipelines.
(6) When the glass fiber reinforced plastic pipe is laid crosswise with other pipes, the glass fiber reinforced plastic pipe shall pass through from below, and the net distance between them shall be greater than the diameter of the fiberglass pipe; if it can only be crossed from the upper part of the horizontal pipe, the net distance between them should be more than 200mm.
(7) FRP pipes should be aligned with the male direction of the pipe in the direction of medium flow.
(8) It is not recommended to use pneumatic pressure test on the pipeline. When using the hydrostatic pressure test, use a soft pigging ball to discharge all the air in the tube. The test pressure is 1125 times the design pressure.
(9) If the glass-fiber reinforced plastic pipe is to be installed on the ground and exposed to sunlight for a long time, it must be made of glass fiber reinforced plastic with ultraviolet protection function.
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