During the construction of LSAW (straight seam submerged arc welded steel pipe), the following precautions should be taken to ensure construction quality and safety:

1. Welding quality

Welding material selection: Select appropriate welding wire and flux according to the type of steel being welded, ensuring that the mechanical properties and crack resistance of the weld metal meet the requirements.

Welding process: Adopt appropriate welding methods and parameters, such as double-sided submerged arc welding, to ensure stable and high-strength weld quality.

Weld seam testing: After welding is completed, non-destructive testing is performed on the weld seam, such as ultrasonic testing, magnetic particle testing, etc., to ensure that the weld seam is free of defects such as cracks and slag inclusions.

2. Steel pipe protection

Anti corrosion treatment: Apply anti-corrosion coatings such as paint, rubber, plastic, etc. on the surface of the steel pipe to reduce the erosion of moisture and oxygen on the steel pipe. At the same time, regularly check whether the coating is intact, and if there is any damage, it should be repaired in a timely manner.

Avoid damage: Necessary protective measures should be taken during transportation and installation to prevent steel pipes from being damaged by collisions, scratches, etc.

3. Construction safety and quality control

Personnel training: Provide necessary training and safety education to enable construction personnel to understand the dangers and safety regulations during the construction process, and strictly comply with them.

Safety equipment: Provide appropriate safety equipment such as helmets, anti slip shoes, safety ropes, etc. to ensure the personal safety of construction personnel.

Quality inspection: Conduct quality inspections on steel pipes and welds before, during, and after construction to ensure compliance with design requirements and relevant standards.

4. Construction environment

Temperature control: The temperature during construction should be controlled within an appropriate range, avoiding construction in extreme low or high temperature environments to prevent affecting the quality of welds and coating effects.

Weather conditions: Pay attention to weather changes and avoid construction in rainy or humid environments. If it rains or the humidity is too high, the operation should be stopped in a timely manner to prevent the coating from getting damp and damaged.

5. Construction process and requirements

Pipeline cutting: Use appropriate tools to cut the pipe, ensuring a smooth surface and avoiding improper heating and deformation of the steel pipe.

Pipeline connection: Use appropriate connection methods such as welding, flange connection, etc. to ensure a firm connection and good sealing.

Pipeline fixation: Choose a suitable fixation method based on geological conditions and load-bearing capacity to ensure that the pipeline will not move or deform under pressure.

In summary, LSAW Steel Pipes require attention to welding quality, steel pipe protection, construction safety and quality control, construction environment, as well as construction processes and requirements during construction. Through strict management and correct measures, construction quality and safety can be ensured to meet engineering requirements.

In addition to the precautions mentioned earlier, LSAW steel pipes also need to pay attention to the following aspects during construction:

1. Storage and pretreatment of steel pipes

Storage environment:

Steel pipes should be stored in a well ventilated and dry place to avoid prolonged exposure to moisture and rain, which may affect the quality and coating effect of the steel pipes.

Avoid direct sunlight to prevent the surface temperature of the steel pipe from rising and causing small cracks or deformations.

Preprocessing:

Before construction, strict pre-treatment should be carried out on the steel pipes, including rust removal, oil removal, etc., to ensure good adhesion between the coating and the steel pipes.

The surface of the pre treated steel pipe should be clean, dry, and free of impurities such as oil stains and dust.

2. Construction preparation and inspection

Construction drawings:

Construction personnel should be familiar with the construction drawings, understand the requirements of pipeline direction, specifications, connection methods, etc.

Material inspection:

Inspect the incoming steel pipes, welding materials, anti-corrosion materials, etc. to ensure that the quality meets the design requirements and relevant standards.

Equipment inspection:

Check the equipment required for construction, such as welding machines, cutting machines, anti-corrosion spraying equipment, etc., to ensure that the equipment is in good condition and functioning properly.

3. Precautions during the construction process

Welding deformation control:

During the welding process, appropriate measures should be taken to control welding deformation, such as using symmetrical welding, internal support reinforcement, etc.

Appearance and internal quality of welds:

The appearance of the weld seam should be flat, smooth, and free of defects such as cracks, slag inclusions, and porosity.

The internal quality of the weld seam should be verified through non-destructive testing to ensure compliance with design requirements.

Construction of anti-corrosion coating:

The construction of anti-corrosion coating should be uniform and continuous, without any omissions, bubbles, peeling or other phenomena.

The coating thickness should meet the design requirements and undergo regular thickness testing.

4. Inspection and acceptance after construction

Appearance inspection:

Conduct visual inspection on the completed pipelines to ensure that the welds, coatings, etc. meet the design requirements.

Non destructive testing:

Perform non-destructive testing on welds, such as ultrasonic testing, radiographic testing, etc., to ensure that there are no defects inside the welds.

Pressure test:

Conduct pressure tests on pipelines to verify their pressure bearing capacity and sealing performance.

Acceptance and recording:

After the construction is completed, acceptance should be organized to ensure that the pipeline quality meets the design requirements and relevant standards. At the same time, do a good job in archiving construction records and quality documents.

In summary, LSAW steel pipes need to pay attention to multiple aspects during construction, including steel pipe storage and pretreatment, construction preparation and inspection, precautions during the construction process, and inspection and acceptance after construction. Through strict management and correct measures, construction quality and safety can be ensured to meet engineering requirements.