How to Choose the Right Pipeline Transportation System

Pipeline transportation is widely used for oil, gas, and chemical transport. Once a pipeline has been selected as the transport method, the next step is to choose the right pipeline system. The selection process starts with five key factors: the transported medium, working pressure, operating temperature, pipe diameter and wall thickness, and pipe material. These are then applied to the pipe type, standard, and grade. This guide covers all of these steps, with practical recommendations by application to help you make an informed decision for your project.

Pipeline transportation has both advantages and limitations. The table below gives a quick overview — follow either link for the full article.

Advantages	Disadvantages
High capacity, continuous operation, low long-term operating cost. ▶ Read more: [Advantages of Pipeline Transportation]	Cargo limitations, high investment, corrosion risks, supply disruption. ▶ Read more: [Disadvantages of Pipeline Transportation]

Key Selection Factors

Based on the Transported Medium

The first consideration when selecting a piping system is the properties of the medium. Different medium properties require different levels of corrosion resistance, strength, and toughness in the piping materials.

1. Crude Oil Pipelines 

 Crude oil pipelines are linear engineering facilities mainly laid underground, used for transporting crude oil over long distances, typically from oil fields or ports to refineries or transshipment depots.

2. Refined Product Pipelines

Refined product pipelines transport products such as gasoline, diesel, kerosene, and jet fuel. These pipelines may use batch or sequential transportation to move different petroleum products through the same pipeline. Careful control and interface management are required to reduce cross-contamination between different products.

3. Natural Gas Pipelines

Natural gas pipelines are designed for the transportation of gas under pressure over short or long distances. Depending on the project requirements, the pipeline system may include compressor stations, gas processing facilities, valves, and pressure control equipment. High-strength carbon steel pipes are commonly used for many long-distance natural gas transmission applications.

4. Slurry Pipelines

Solid slurry pipelines are pipeline systems for long-distance transportation of mixed solid particles and liquid slurries. Solid slurry pipelines use pressurization equipment to provide pressure energy for transporting slurry, enabling long-distance transport and large-capacity delivery.

Based on Working Pressure

Working pressure is an important factor when selecting the right pipeline. 

1. Design Pressure

Design pressure is the pressure used as a basis for designing and selecting a pipeline system. It is determined according to factors such as the transported medium, operating conditions, temperature, and system requirements. A higher design pressure generally requires a pipe with sufficient strength and an appropriate wall thickness to safely withstand the internal pressure. Therefore, when selecting a pipeline, the design pressure should be determined first, followed by the appropriate pipe material, grade, diameter, and wall thickness.

2. Test Pressure

Test pressure is the pressure applied during pressure testing after the pipeline has been installed. It is generally higher than the normal operating pressure and is used to verify the strength and leak-tightness of the pipeline system. Although test pressure is not normally the primary factor used to select the pipe, it is an important part of verifying whether the selected pipeline and completed system meet the required safety and reliability requirements.

Based on Operating Temperature

Operating temperature directly affects the selection of pipe material and specifications. Different temperature ranges may require different material properties to ensure safe and reliable pipeline operation. ▶ [Understand Carbon Steel Pipe Temperature Limits]

Operating Temperature	Main Considerations	Pipeline Selection
Low Temperature	Toughness and resistance to brittle fracture	Select materials suitable for low-temperature service
Normal Temperature	Strength, durability, and cost	Standard pipeline materials can usually be considered
High Temperature	Strength retention and thermal expansion	Select materials suitable for high-temperature service

Based on Pipe Diameter and Wall Thickness

Pipe diameter and wall thickness are important factors in pipeline selection. The appropriate dimensions should be determined according to the flow rate, operating pressure, transported medium, and service conditions.

Factor	Pipe Diameter	Wall Thickness
Flow Rate	A higher flow rate generally requires a larger diameter to provide sufficient transportation capacity.	—
Flow Velocity	The diameter should help maintain an appropriate flow velocity and reduce excessive pressure loss.	—
Operating Pressure	—	Higher operating pressure generally requires greater wall thickness to withstand the internal pressure.
Transported Medium	Density and viscosity can affect flow resistance and the required pipe diameter.	The properties of the medium may affect material selection and corrosion allowance.
Pipe Length	Longer pipelines require careful consideration of pressure loss and energy consumption when determining the diameter.	—
Corrosion	—	Additional wall thickness may be required when corrosion is expected during service.

▶ For a detailed comparison of common wall thickness grades such as SCH 40 and SCH 80, see our [Steel Pipe Schedule Guide: SCH 40 vs SCH 80].

Based on Pipe Material

This table lists common pipe materials and grades by transported medium. For example, API 5L is commonly used for oil and gas transmission pipelines, while ASTM A312 is widely used for stainless steel pipes in corrosive applications.

Transported Medium	Common Pipe Material / Specification	Typical Grades
Crude Oil	Carbon Steel / API 5L	X42, X52, X60, X65, X70
Natural Gas	Carbon Steel / API 5L	X52, X60, X65, X70
Water	Carbon Steel / ASTM A53, A106	Grade A, B
High-Temperature Fluids	Carbon Steel / ASTM A106	Grade B, C
Corrosive Fluids	Stainless Steel / ASTM A312	TP304, TP304L, TP316, TP316L
High-Temperature and High-Pressure Fluids	Alloy Steel / ASTM A335	P11, P22, P91

Key Criteria for Steel Pipe Selection

Once the key selection factors above have been evaluated, the next step is to apply them to the pipe type, the applicable standard, and the pipe material.

Seamless vs. Welded Pipes

The choice between seamless and welded pipe depends mainly on operating pressure, diameter, and project budget.

● Seamless pipes are manufactured without a weld seam, offering higher strength and reliability for high-pressure and long-distance transport. They are widely used in oil and gas pipelines where safety is critical.

● Welded pipes (ERW, LSAW, SSAW) are more cost-effective for large-diameter and moderate-pressure applications. Electric resistance welded (ERW) pipes are commonly used in gathering lines and distribution networks.

Key Standards

● API 5L — the primary standard for line pipe used in oil and gas transmission, covering grades from A to X80 for different pressure requirements. 
● ASTM A53 / A106 — widely used in general piping applications. ▶ Read more: [ASTM A53 vs ASTM A106 vs API 5L: Key Differences].

Material Selection

Carbon steel is the most common material for pipeline transportation.
● For high-pressure and high-strength requirements, X70 and X80 grades are preferred for long-distance pipelines.
● For corrosive environments, corrosion-resistant alloys or coated pipes should be considered.

▶ For more details on pipe sizes and specifications, see our [Steel Pipe Size Chart for Oil and Gas Pipelines].

Typical Applications and Recommended Pipe Selection

The previous tables focus on material selection by medium and on general selection criteria. The table below goes one step further — it recommends pipe type, grade, and standard by typical application.

Conclusion

Selecting the right steel pipe is critical to the safety, efficiency, and service life of any pipeline project. By evaluating the five key factors — transported medium, working pressure, operating temperature, diameter and wall thickness, and pipe material — and then applying the right pipe type, standard, and grade, project planners can reduce risk, optimize cost, and ensure long-term compliance.

Whether the project involves high-pressure trunk lines, sour service, low-temperature conditions, or corrosive soils, the right combination of pipe type, grade, and standard makes the difference between a reliable pipeline and a costly failure.

Related topics: 

● Engineering Benefits of Pipeline Transportation

● Disadvantages of Pipeline Transportation: Limitations, Cost and Risks

● ASTM A53 VS ASTM A106 VS API 5L Pipe

● 3 Types of Long-distance Oil and Gas Transmission Steel Pipes 

Need Help Selecting Steel Pipes?

Hunan Standard Steel Co., Ltd (HSCO) is a leading manufacturer and exporter of seamless & welded steel pipes, including API 5L line pipes, carbon steel pipes, alloy steel pipes, and stainless steel pipes for pipeline transportation.

▶ Contact us with your project specifications (medium, diameter, wall thickness, grade, standard), and our team will recommend the right pipe solution within 24 hours.