1. Oil and gas transmission pipelines

Corrosion resistance: Due to the presence of corrosive components such as hydrogen sulfide, carbon dioxide, and moisture in the transported oil and natural gas, SSAW Steel Pipes need to have good internal corrosion resistance. Usually, internal coatings such as epoxy powder coatings are used to prevent direct contact between oil and gas and the inner wall of steel pipes. The coating should be uniform, pore free, and have a thickness that meets relevant standards to resist corrosion from the medium.

Strength and pressure bearing capacity: It should be able to withstand high internal pressure to ensure the safe transportation of oil and gas. The material and wall thickness of steel pipes need to be determined based on the conveying pressure, pipe diameter, and safety factor. For example, for high-pressure oil and gas transportation, the yield strength of steel pipes may need to reach X60 X80 level, while the wall thickness must meet the requirements of the strength calculation formula to prevent pipeline rupture.

Sealing: The sealing of pipeline connections is crucial. Whether it is welding connection or flange connection, it is necessary to ensure that there is no leakage at the connection. For welding, it is necessary to ensure the quality of the weld seam and conduct non-destructive testing, such as ultrasonic and radiographic testing, to ensure that the weld seam has no defects such as porosity or slag inclusion; For flange connections, suitable sealing gaskets should be selected and bolts should be tightened to the specified torque to ensure sealing effectiveness.

2. Platform structure support

Strength and bearing capacity: As a structural component of the platform, SSAW steel pipes must have sufficient strength to withstand the weight of the platform itself, equipment weight, as well as environmental loads such as waves and sea winds. According to the design requirements of the platform and the environmental conditions of the sea area, calculate the required yield strength and tensile strength of the steel pipe to ensure that it can safely bear various loads.

Stability and deformation resistance: Good stability is required to prevent excessive deformation or instability when subjected to external forces. For some slender supporting structures, such as railings, overpasses, etc., their ability to resist bending and torsional deformation should be considered, and the size of steel pipes and support spacing should be designed reasonably to meet stability requirements.

Fatigue resistance: In marine environments, platform structures are subjected to periodic waves and wind forces, causing steel pipes to withstand alternating stresses. Therefore, SSAW steel pipes need to have good fatigue resistance. Through reasonable material selection and manufacturing processes, such as controlling weld quality and residual stress, the fatigue life of steel pipes can be improved to prevent fatigue cracks and fractures.

3. Water and gas injection system pipelines

Corrosion resistance to media: For water injection pipelines, they should be able to resist corrosion from seawater or injected water. If it is seawater, the steel pipe needs to have good resistance to chloride ion corrosion; For gas injection pipelines, it is necessary to consider the corrosion that may be caused by impurities (such as sulfides) in the gas. Corresponding anti-corrosion measures can be taken, such as internal coating or adding corrosion inhibitors, to ensure the service life of the pipeline.

Pressure adaptability: Reasonably design the wall thickness and material of steel pipes according to the pressure requirements of water or gas injection. The water injection pressure is generally relatively low, but in some high-pressure water injection situations, the steel pipe also needs to meet the corresponding strength requirements; The injection pressure varies depending on the nature of the gas and the purpose of injection. It is necessary to ensure that the steel pipe can withstand the maximum injection pressure without leakage or rupture.

Cleanliness and anti clogging: In order to prevent impurities in water or solid particles in gas from clogging the pipeline, SSAW steel pipes must maintain a certain level of cleanliness inside. Before installation, the pipeline should be cleaned, and a filtering device should be installed during operation to prevent impurities from entering the pipeline. At the same time, the inner diameter and roughness of the pipeline should be appropriate to reduce the possibility of blockage.

4. Fire and utility pipelines

Corrosion resistance and durability: Fire water pipelines and utility pipelines (such as seawater cooling pipelines) that come into long-term contact with water must have good corrosion resistance. For seawater cooling pipelines, the corrosiveness of seawater should also be considered, and anti-corrosion coatings or cathodic protection measures may be required. At the same time, these pipelines need to have a long service life and be able to operate continuously and stably in marine environments.

Pressure and flow requirements must be met: The fire water pipeline must be able to provide sufficient fire water flow and pressure within the specified time to meet the needs of firefighting. Therefore, the diameter and wall thickness of SSAW steel pipes should be determined according to the design requirements of the fire protection system to ensure that the hydraulic performance of the pipeline meets the standards. For seawater cooling pipelines, the parameters of the pipeline should be designed reasonably according to the flow rate and pressure requirements of the cooling equipment to ensure the cooling effect.

Emergency performance: In case of emergency, such as a fire, the SSAW steel pipe of the fire water pipeline should be able to withstand instantaneous high-pressure impact and remain intact. This requires steel pipes to have certain toughness and impact resistance, while the connection parts should be firm and not leak or break in emergency situations.

5. Pipeline of wastewater treatment system

Chemical corrosion resistance: When transporting oily wastewater and treated wastewater, SSAW steel pipes should be able to resist the corrosion of various chemical substances in the wastewater, including petroleum substances, acid and alkali components, etc. According to the nature of the sewage, different anti-corrosion measures can be taken, such as using corrosion-resistant inner coatings or selecting special materials for steel pipes, to ensure that the pipeline will not be corroded and leak.

Anti clogging and easy cleaning: Due to the presence of solid impurities and oil stains in sewage, pipelines are prone to clogging. The inner diameter design of SSAW steel pipes should be reasonable, minimizing corners and pipe diameter changes as much as possible to prevent impurity accumulation. At the same time, the inner wall of the pipeline should be smooth for easy cleaning when needed, such as using high-pressure water flushing or chemical cleaning methods.

Sealing and environmental requirements: In order to prevent sewage leakage from polluting the marine environment, the sealing of pipelines is crucial. During the connection and installation of pipelines, it is necessary to strictly follow the sealing requirements to ensure no leakage. And the materials and anti-corrosion measures of the pipeline must meet environmental requirements and not cause harm to the surrounding marine ecology.

6. Chemical transportation pipelines (for low corrosive chemicals)

Chemical resistance matching: Select the appropriate SSAW steel pipe material and inner coating based on the properties of the transported chemicals. For different low corrosivity chemicals, such as water treatment agents, scale inhibitors, etc., their chemical composition and corrosiveness are different. Therefore, it is necessary to evaluate the chemical resistance of steel pipes to ensure that they can remain stable during contact with chemicals and not be damaged by chemical reactions.

Safety factor and pressure level: Considering the safety of chemical transportation, even low corrosive chemicals need to ensure that the pipeline can withstand a certain pressure. Suitable safety factors and pressure levels should be determined based on factors such as the transportation pressure of chemicals and the usage environment of pipelines. SSAW steel pipes with corresponding wall thickness and strength should be selected to prevent pipeline rupture and chemical leakage caused by excessive pressure.

Purity and hygiene requirements (if any): For some chemicals that require high purity, such as food grade water treatment agents, SSAW steel pipes must meet certain hygiene standards. This may include non-toxic requirements for the inner coating, cleanliness control during the steel pipe manufacturing process, etc., to ensure that the quality of the transported chemicals is not affected.

7. Communication and instrument cable protection conduit

Mechanical protection performance: The main function is to protect cables from mechanical damage, and SSAW steel pipes should have sufficient strength and hardness. The wall thickness should be able to resist collisions, compressions, and scratches from external objects. If personnel and equipment activities on the platform may cause accidental collisions with the cable protection pipe, the steel pipe should be able to prevent damage to the cable.

Electromagnetic shielding performance (if required): SSAW steel pipes may need to have certain electromagnetic shielding performance in some communication and instrument cable protections that are sensitive to electromagnetic interference. This can be achieved by selecting appropriate steel pipe materials or adding electromagnetic shielding layers on the surface of the steel pipe to prevent external electromagnetic signals from interfering with the signals inside the cable, ensuring the accuracy of communication and instrument signals.

Sealing and Waterproof: In order to prevent seawater and moisture from entering the protective tube and affecting the performance of the cable, the connection parts of SSAW steel pipes should be well sealed. Sealing measures such as sealant and rubber sealing rings can be used to ensure dryness inside the cable and protect its insulation performance and service life.

8. Mud and cuttings transportation pipeline (drilling stage)

Wear resistance: When transporting drilling mud and cuttings, the inner wall of the pipeline must withstand the erosion and friction of the mud and cuttings, so SSAW steel pipes need to have good wear resistance. The wear resistance of the pipeline can be improved by using wear-resistant coatings, increasing the wall thickness of the steel pipe, or selecting wear-resistant materials to prevent rapid wear of the inner wall of the pipeline, which can lead to leakage or damage.

Anti clogging ability: Drilling mud and cuttings contain a large amount of solid particles, making pipelines prone to clogging. The inner diameter of SSAW steel pipes should be designed reasonably based on factors such as the flow rate and particle size of mud and drill cuttings, and the internal smoothness of the pipeline should be ensured to reduce particle accumulation and blockage. At the same time, appropriate filtering devices and cleaning ports should be installed in the pipeline system to facilitate the cleaning of blocked pipelines.

Pressure and flow adaptability: Drilling mud needs to be transported to the wellhead at a certain pressure to meet the requirements of drilling operations, such as cooling the drill bit and balancing formation pressure. SSAW steel pipes should be able to withstand the pressure of mud transportation and ensure sufficient flow rate. Therefore, the wall thickness and diameter of steel pipes should be designed reasonably based on factors such as the properties of the slurry, transportation distance, and pressure requirements.