Gas systems play an essential role in modern homes — from heating and cooking to producing hot water. However, what many homeowners don’t realise is that the gas pipes beneath their property can rust and corrode over time.
When this happens, the system becomes inefficient, leading to low gas pressure, poor performance, and higher energy bills. Understanding how rust affects your gas lines and knowing when to call a professional can help you save both money and safety concerns.
How rust and corrosion affect gas flow
Gas pipes, especially older steel ones, are constantly exposed to moisture, temperature fluctuations, and soil movement. Over time, these conditions cause oxidation — a chemical reaction between metal and oxygen that leads to rust.
Once rust begins forming inside or outside the pipes, it reduces the pipe’s internal diameter and restricts gas flow. This results in:
- Reduced gas pressure: Appliances like stoves or heaters may take longer to ignite or fail to perform efficiently.
- Increased energy consumption: As gas struggles to move through corroded pipes, appliances use more fuel to deliver the same output.
- Higher energy bills: Inefficient gas flow means your system burns more fuel, costing you extra each month.
The development of corrosion in gas pipes
1. Moisture exposure
Pipes installed underground or in damp areas are especially prone to rust. Even small cracks in the protective coating allow water to enter, accelerating corrosion.
2. Soil movement
Soil shifts caused by heavy rain, poor compaction, or minor ground movement can bend or crack pipes. Once the protective coating is damaged, oxygen and water easily reach the metal surface, causing rust to form.
3. Chemical reactions
Certain soils rich in salts or acids react with metal surfaces, breaking down the pipe’s structure and strength. This type of corrosion increases the risk of leaks over time.
4. Ageing pipes
Homes built before the 1980s often contain galvanised or black steel gas pipes. These materials deteriorate naturally with age, developing internal and external corrosion.
Engaging certified gas fitters Adelaide is crucial for inspecting and upgrading these old lines with modern, corrosion-resistant materials such as copper or polyethylene (PE).
The hazards of rusted gas pipes
While low pressure and high bills are frustrating, rusted pipes pose far more serious safety threats.
1. Gas leaks
Corroded metal weakens easily, forming tiny cracks or holes that allow gas to escape. Even a small leak can be extremely dangerous, as natural gas is highly flammable and can cause fires or explosions.
2. Health risks
Gas exposure can lead to dizziness, nausea, headaches, or even suffocation in enclosed areas. If you ever smell gas, evacuate immediately and contact emergency services.
3. Property damage
Gas leaks can ignite and cause extensive property destruction. Even without a fire, corrosion damage often leads to expensive structural repairs or replacement costs.
A licensed Plumber can detect and replace corroded sections promptly, ensuring your gas system operates safely and efficiently.
Gas pipe corrosion solutions by professionals
Repairing or replacing gas pipes should never be a DIY job. Only licensed professionals with proper training and safety certification should handle gas systems.
1. Comprehensive inspection
Qualified Gas Fitters use advanced tools like pressure gauges and gas leak detectors to identify corrosion or leaks hidden beneath walls or floors.
2. Pipe upgrades and replacement
If corrosion is severe, professionals will replace old steel pipes with copper or polyethylene (PE) ones. These materials are durable, flexible, and resistant to moisture and chemical damage, reducing future maintenance needs.
3. Leak sealing and protective coatings
When corrosion is caught early, applying protective coatings or finishes can prevent further deterioration. This method is used only when pipes remain structurally sound.
4. System testing and pressure checks
After repairs or replacements, plumbers perform pressure tests to ensure gas flow is stable and consistent. This guarantees that appliances perform optimally without wasting energy.
Preventing future corrosion
To avoid similar issues in the future, homeowners can take several proactive steps:
- Schedule annual inspections: Have a licensed Plumber in Adelaide check for early signs of corrosion or pressure irregularities.
- Upgrade old systems: Replace outdated steel lines with corrosion-resistant alternatives.
- Maintain proper drainage: Keep the area around pipes dry to prevent water exposure.
- Avoid soil contact: Above-ground pipes should remain well-ventilated and free of moisture.
- Monitor performance: Weak flames, delayed ignition, or uneven heating indicate gas flow issues — call a professional immediately.
Preventive maintenance, along with periodic inspections by a Building Inspector, ensures that gas and structural systems remain safe, reliable, and compliant with Australian standards.
The link between corrosion and surface repairs
In some cases, corroded gas lines may be associated with other forms of property damage, such as cracks or bubbling in rendered walls. Professional rendering repairs help seal external surfaces, preventing moisture from seeping into structural components — including gas and plumbing lines. Coordinating gas maintenance with surface restoration can significantly improve both safety and longevity.
Conclusion
Rusted gas pipes aren’t just a maintenance issue — they can quietly endanger your health, home, and finances. Internal corrosion restricts gas flow, lowers pressure, and forces appliances to work harder, driving up utility costs.
If you live in an older home or notice reduced performance from your gas appliances, don’t delay. Hire licensed Gas Fitters or a qualified Plumber in Adelaide to inspect and replace outdated pipes with safer, modern materials. With timely maintenance and professional oversight, you can enjoy efficient, secure, and cost-effective gas performance all year round.
FAQs
1. How do I know if my gas pipes are corroded?
Watch for low gas pressure, uneven flames, or a persistent odour near appliances. Visible rust on exposed pipes is also a warning sign. Contact a licensed Plumber immediately.
2. Can rusted gas pipes increase my gas bills?
Yes. Corroded pipes restrict gas flow, forcing appliances to consume more fuel to maintain output — which increases your monthly energy costs.
3. Are plastic gas pipes better than steel ones?
Yes. Modern polyethylene (PE) pipes are flexible, corrosion-resistant, and easier to install than traditional steel pipes, offering improved durability and efficiency.
4. What happens if I ignore rusted gas pipes?
Neglecting corrosion can lead to leaks, fire hazards, or even explosions. It’s crucial to follow Australian safety standards and replace damaged lines promptly.
5. Who should I contact to replace rusted gas pipes?
Always call licensed Gas Fitters or a Plumber in Adelaide who are qualified to inspect, repair, or replace gas lines safely. A Building Inspector can also assess overall safety compliance.