Precautions for the use of straight seam welded pipes

A straight seam welded pipe is a steel pipe with a weld seam running parallel to its longitudinal direction. Based on the forming process, it is categorized into high frequency straight seam steel pipes (ERW pipes) and submerged arc welded straight seam steel pipes (LSAW pipes).

1. Construction Preparation

Before using straight seam welded pipes, ensure the following preparations:

Trenching: The pipeline trench must be properly excavated.

Brick Laying: Complete the brick laying for the pipeline well.

Material Readiness: Ensure all required welded pipes and materials are on-site.

Equipment Preparation: Gather necessary tools and equipment such as electric welding machines, cutting machines, electric hammers, and grinders.

General Preparations: Make a series of necessary preparations to facilitate the installation process.

2. Installation Process

The installation of straight seam welded pipes involves strict technical requirements to ensure safety and quality. The following steps must be followed:

Positioning: Position the welded pipes according to the drawing plan.

Prefabrication: Prefabricate pipe supports based on the on-site environment.

Cutting and Grinding: Cut the materials according to the plan and on-site measurements. Grind the groove with a polisher before welding.

Welding: Proceed with welding, ensuring all technical standards are met.

3. Quality Requirements

During installation and use, maintain the following quality standards:

Branch Pipe Welding: Do not weld branch pipes at the weld seam of the welded pipe, and avoid welds at bends.

Alignment Accuracy: The error for the riser of the straight device should be less than 3 mm per meter, and the error for water installation should be less than 1 mm.

Weld Quality: Ensure the weld seam is straight, full, and free of burn-throughs and cracks.

4. Insulation and Material Longevity

When selecting insulation material for welded pipes, consider the following to ensure durability and efficiency:

Service Life: Choose insulation materials that offer a long service life to avoid frequent disassembly and assembly.

Heat Loss Reduction: Selecting the right insulation material for steam pipes can reduce heat loss.

Material Saving: Efficient insulation materials can save on material costs.

Ease of Installation: Opt for materials that facilitate easy installation and disassembly.