Gas testing pressurizes your entire piping system to identify leaks anywhere in the network, while a leak survey uses handheld electronic detectors to locate specific leak points without applying pressure to the lines. These are two distinct diagnostic approaches, each with specific applications depending on your system's condition, the scope of your concern, and safety requirements.
**How Gas Testing Works**
Gas testing, also called pressure testing, involves introducing inert gas (typically nitrogen) into your entire gas line system at a controlled pressure, usually between 3 and 15 PSI depending on your local code requirements. A technician then monitors pressure gauges over a set period—typically 10 to 30 minutes—to detect any drop that would indicate a leak. If pressure holds steady, your system passes. If it drops, you know a leak exists somewhere in the network, but pinpointing the exact location requires additional investigation. This method is comprehensive and is often required by code when new gas lines are installed or after major system modifications. It's particularly valuable for detecting small leaks that might otherwise go unnoticed until they become safety hazards.
**How Leak Surveys Function**
A leak survey employs electronic gas detectors that sense the presence of mercaptan—the odorant added to natural gas—or other trace compounds. Technicians systematically move the detector probe along every accessible fitting, connection, and section of pipe. When the detector encounters escaping gas, it alerts audibly and visually, allowing the technician to mark the exact location. This method doesn't require pressurizing the system, making it safer for older piping or systems with known weak points. Leak surveys are ideal for investigating suspected leaks in specific areas, verifying repairs, or conducting routine safety inspections on existing systems.
**Choosing the Right Approach**
The decision between these methods depends on several factors. New installations and code compliance typically require pressure testing. If you suspect a leak in a particular area—perhaps you smell gas near a water heater or stove connection—a leak survey pinpoints the problem quickly. For comprehensive safety audits of older homes or commercial properties, many professionals recommend starting with a leak survey to identify problem areas, then using pressure testing to verify the overall system integrity after repairs.
Our technicians at Blackmon Plumbing assess your specific situation during an initial inspection. We carry both pressure testing equipment and electronic gas detectors, and with 19 years of experience and our MPL-38162 license, we determine the most effective diagnostic strategy for your safety and peace of mind. Whether your system needs a full pressure test or targeted leak detection, we ensure your gas lines meet safety standards and function reliably.
Blackmon Plumbing provides comprehensive gas testing and leak survey services throughout the service area, helping homeowners and businesses identify and resolve gas line issues safely and efficiently.