PVC Pipe for Underground vs. Above-Ground Applications: What You Need to Know

PVC pipe is widely used in construction, irrigation, and drainage systems due to its durability, affordability, and resistance to corrosion. However, selecting the right type of PVC pipe for underground vs. above-ground applications is crucial to ensure long-term performance and prevent costly repairs.

At Western Ag, we manufacture high-quality PVC pipe for both above-ground and underground installations, helping businesses and agricultural operations across West Texas and beyond find the best solutions for their needs. Here’s what you need to know when choosing the best PVC pipe types for your project.

Key Differences Between Underground and Above-Ground PVC Pipe

1. Exposure to Environmental Factors

The biggest difference between underground PVC pipe and above-ground PVC pipe is exposure to the elements.

Underground PVC pipe is protected from direct sunlight and temperature fluctuations but must withstand soil pressure, moisture, and potential chemical exposure.
Above-ground PVC pipe faces risks from UV exposure, weathering, and physical impact, requiring materials that can resist brittleness and degradation over time.

Choosing the right PVC pipe type ensures it can withstand specific environmental challenges in its installation location.

Best PVC Pipe Types for Underground Use

1. Schedule 40 & Schedule 80 PVC Pipe

For most underground applications, Schedule 40 and Schedule 80 PVC pipes are commonly used due to their strength and resistance to corrosion.

Schedule 40 PVC: A cost-effective choice for low-pressure applications, such as residential water lines, irrigation, and drainage systems.
Schedule 80 PVC: Thicker walls make it ideal for high-pressure systems, such as industrial and municipal water transport.

Important Tip: When using underground PVC pipe, ensure it is buried at the correct depth to protect against vehicle or heavy equipment damage.

2. PVC Pressure Pipe (ASTM D2241)

For large-scale irrigation systems, PVC pressure pipe manufactured under ASTM D2241 standards provide high strength and flexibility, making it suitable for agriculture, municipal water lines, and wastewater applications.

3. PVC Sewer and Drain Pipe

For sewer and drainage applications, perforated or non-perforated PVC pipe is commonly used. ASTM D3034 SDR 35 PVC is designed for gravity-flow sewer systems, offering high resistance to soil pressure and groundwater infiltration.

4. Encapsulation for Added Protection

If underground PVC pipe is installed in areas with heavy traffic or unstable soil, consider encasing them in concrete or using protective sleeves to prevent damage from shifting ground conditions.

Best PVC Pipe Types for Above-Ground Use

1. UV-Resistant PVC Pipe

Above-ground PVC pipe is exposed to direct sunlight, which can cause brittleness and fading over time. Using UV-resistant PVC pipe (often treated with protective coatings or special additives) helps extend their lifespan.

2. Schedule 80

For above-ground installations subject to physical impact, such as agricultural irrigation systems or construction scaffolding, Schedule 80 PVC offers additional protection due to its thicker walls and higher-pressure rating.

3. Proper Support and Expansion Considerations

Above-ground PVC installations require proper bracing and support to prevent sagging, especially over long distances. Additionally, PVC expands and contracts with temperature changes, so expansion joints or flexible connectors may be needed to prevent cracking.

Choosing the Right PVC Pipe for Your Application

When selecting PVC pipe for underground or above-ground applications, consider the following:

Pressure Rating: Will the pipe handle high or low-pressure systems?
UV Resistance: Does it need protection from prolonged sun exposure?
Chemical Resistance: Will the pipe be exposed to fertilizers, wastewater, or industrial chemicals?
Load-Bearing Strength: Will it be buried under heavy loads or exposed to frequent impacts?

Understanding these factors allows you to confidently choose the best PVC pipe for your project, ensuring long-term durability.

Get High-Quality PVC Pipe from Western Ag

At Western Ag, we manufacture PVC pipe designed for both underground and above-ground applications, meeting industry standards for strength, longevity, and performance.

Whether you’re installing underground water lines, above-ground irrigation systems, or industrial piping, we have the right PVC pipe solutions for your needs.