How to assess the overall cost of straight seam submerged arc welded steel pipes?

Number of visits：58 seconds Update time：2025-12-26

In oil, gas, and municipal pipeline projects, straight seam submerged arc welded steel pipes (LSAW) are commonly used in long-distance pipelines, but their procurement cost is not simply a matter of unit price. When assessing overall costs, the purchaser needs to consider the entire lifecycle costs, from materials and transportation to construction and operation and maintenance.

1. Detailed Explanation of Materials and Production Costs

The production cost of straight seam submerged arc welded steel pipes mainly consists of three parts: steel, welding process, and anti-corrosion treatment. Different types of projects have different requirements for these factors, and the purchaser can select the appropriate type based on the actual project conditions.

(1) Selection of steel price and grade

(2) Welding process and quality requirements

(3) Corrosion protection and coating treatment

(4) Comprehensive procurement suggestions

Select the steel grade based on the engineering pressure and the conveyed medium: X52/X60 for medium and low pressure short distances, X65/X70 for high pressure long distances, and X80/X100 for extreme environments.

Welding process matching engineering requirements: For short-distance pipelines, single-sided welding can be selected; for medium and long-distance or high-pressure pipelines, double-sided submerged arc welding must be adopted to ensure full penetration.

Anti-corrosion treatment is selected based on the environment: FBE for low corrosion, 3PE for medium to high corrosion, and 3PE + internal anti-corrosion for high corrosion or offshore pipelines.

Pay attention to life cycle costs: High-grade steel with high initial costs and high-standard anti-corrosion pipes can save construction and operation and maintenance costs in the long term.

II. Transportation and Logistics Costs

Transportation costs for straight seam submerged arc welded steel pipes account for a significant portion of the total procurement cost, especially for large-diameter, thick-walled pipes and long-distance projects. The purchaser needs to comprehensively evaluate factors such as transportation methods, packaging protection, and stacking methods.

(1) Transportation Methods

(2) Packaging and port protection

(3) Stacking and Transportation Safety

1) Stacking Method

Pipes should be stacked according to specifications and layered using support frames.

Avoid direct contact with the ground to prevent moisture damage or damage to the anti-corrosion layer.

2) Weight and Size Control

Large-diameter, thick-walled pipes require consideration of vehicle load-bearing capacity and loading/unloading safety.

Extra-long pipes (≥12 meters) require special transport vehicles or multi-point support to prevent bending and deformation.

3) Transportation Plan and Route

Plan short and safe transportation routes, avoiding potholes or low-bridge height restrictions as much as possible.

For cross-regional or international transportation, port and dock restrictions and customs clearance requirements must be understood in advance.

(4) Cost control strategy

III. Detailed Explanation of Construction and Installation Costs

The construction and installation costs of straight seam submerged arc welded steel pipes account for a significant portion of the total project cost, especially for large-diameter, high-pressure, and long-distance pipelines. The costs are mainly determined by welding construction, laying methods, construction environment, and auxiliary equipment.

(1) Welding Construction Costs

(2) Cost of laying method

(3) Construction Environment and Auxiliary Equipment Costs

1) Environmental Factors: Permafrost, wetlands, and high or low temperature environments require special construction measures, increasing construction costs.

Construction across rivers, highways, or tunnels requires special support, hoisting, and safety measures.

2) Auxiliary Equipment: Large-diameter pipelines require machinery such as cranes, hydraulic pipe turning machines, and welding equipment.

Welding platforms, scaffolding, and protective facilities are also part of the cost.

(4) Key points for construction and installation cost control

IV. Acceptance and Testing Costs

(1) On-site Acceptance: Costs for instrument testing such as UT, RT, and coating thickness measurement for full or random inspections.

Costs of third-party testing organizations (SGS, BV, DNV).

(2) Standards and Documents: Costs for providing certificates of conformity, material certificates, test reports, and other document management.

V. Long-term operation and maintenance costs

(1) Corrosion protection and maintenance: Early investment in high-quality anti-corrosion coatings can reduce mid-term operation and maintenance costs.

(2) Pipeline lifespan: The longer the pipeline lifespan, the lower the overall comprehensive cost.

Choosing high-standard steel pipes and superior anti-corrosion processes, although the unit price is higher, is more economical in the long run.

VI. Purchaser's strategy for assessing overall costs