Underground Plumbing Upgrade: Galvanized Pipe – Pros and Cons Exposed

In the realm of construction, the question of whether galvanized pipe can withstand the rigors of underground environments often arises. This blog post delves into this topic, examining the properties, advantages, and limitations of galvanized pipe for subterranean use.

Properties of Galvanized Pipe

Galvanized pipe is steel pipe coated with a zinc layer to enhance its corrosion resistance. This zinc coating acts as a barrier against moisture and oxygen, protecting the underlying steel from rust and deterioration.

Advantages of Using Galvanized Pipe Underground

• Corrosion Resistance: The zinc coating provides excellent protection against corrosion, making galvanized pipe ideal for moisture-prone underground environments.
• Durability: Galvanized pipe is highly durable and can withstand the stresses of underground installation and soil movement.
• Cost-Effective: Compared to other corrosion-resistant materials, galvanized pipe offers a cost-effective solution for underground applications.

Limitations of Using Galvanized Pipe Underground

• Soil Conditions: Highly acidic or alkaline soils can compromise the zinc coating, reducing the pipe’s corrosion resistance.
• Stray Electrical Currents: Stray electrical currents can accelerate the corrosion process, especially in the presence of moisture.
• Compatibility with Other Materials: Galvanized pipe may not be compatible with certain types of soil or other materials used in underground installations.

Factors to Consider for Underground Use

• Soil Conditions: Determine the acidity and alkalinity of the soil to assess the suitability of galvanized pipe.
• Electrical Currents: Evaluate the potential presence of stray electrical currents and take appropriate mitigation measures.
• Compatibility: Check the compatibility of galvanized pipe with other materials used in the underground system.
• Installation Practices: Follow proper installation techniques to ensure the integrity of the pipe and protect the zinc coating.

Alternative Options for Underground Piping

In certain cases, galvanized pipe may not be the optimal choice for underground use. Alternative options include:

• Polyethylene (PE) Pipe: PE pipe is resistant to corrosion and is commonly used for water and gas distribution.
• Chlorinated Polyvinyl Chloride (CPVC) Pipe: CPVC pipe is resistant to chemicals and is suitable for hot water applications.
• Ductile Iron Pipe: Ductile iron pipe is strong, durable, and resistant to corrosion.

Final Note: Making an Informed Decision

The suitability of galvanized pipe for underground use depends on various factors, including soil conditions, electrical currents, and compatibility with other materials. By carefully considering these factors and following proper installation practices, galvanized pipe can provide a reliable and cost-effective solution for many underground applications.

Quick Answers to Your FAQs

Q: Can galvanized pipe rust underground?
A: Yes, galvanized pipe can rust if the zinc coating is compromised due to acidic soil conditions or stray electrical currents.

Q: What type of soil is not suitable for galvanized pipe underground?
A: Highly acidic or alkaline soils can damage the zinc coating, reducing the pipe’s corrosion resistance.

Q: What are the signs of corrosion in galvanized pipe?
A: Signs of corrosion include rust spots, flaking, or blistering of the zinc coating.

Q: Can I use galvanized pipe for gas lines underground?
A: Yes, galvanized pipe is commonly used for gas lines underground, provided that it meets the applicable standards and installation requirements.

Q: Is galvanized pipe suitable for potable water underground?
A: Yes, galvanized pipe can be used for potable water underground, as long as it is properly installed and maintained.