How To Purge Air From Propane Gas Line – Step By Step

Suppose your old propane gas line was recently damaged, so you purchased a brand-new one. You never want to risk things like these. In another scenario, you may have upgraded your line’s valve or replaced the valve from an older line.

After any of these situations, the air has found its way into the gas line. Air pockets trapped in the propane line might cause a brief disruption in service. This can cause delay, resistance to start, or other operational difficulties.

So, what should you do next? How to purge air from a Propane gas line? You need to remove air from your propane gas line. This guide will explain how to purge air from a propane gas line. Let’s get into this.

How To Purge Air From Propane Gas Line

What Does It Mean To Purge A Gas Line?

What Does It Mean to Purge a Gas Line

Purging a gas line is a process that involves removing any unwanted or hazardous gases from a pipeline or system before it is put into use or maintained. This procedure is typically done to ensure safety in the workplace and prevent accidents or explosions.

Purging a gas line is an important process that should be taken seriously. It involves removing any air or other unwanted substances from the gas line to ensure it functions properly and safely. While this may seem simple, it requires specialized equipment and expertise to be done correctly.

Purging avoids the risk of an existing or growing explosive air-gas mixture in consumer pipes, appliances, or restricted locations. This is accomplished by injecting a propane-based inert gas into the pipe. The inert gas in the tube combines with the gas to form a mixture. This reduces the risk of a combustion mix harming customers.

Why Purge?

Purging a gas line is essential in various industries, including oil and gas, chemical plants, and refineries. In these industries, pipelines are handy for transporting flammable and hazardous gases, which can be dangerous if not handled correctly. Purging a gas line ensures the pipeline is safe and meets industry standards.

Before shipment, they check new propane gas lines normally hydrostatically for leakage. When a propane gas line is sent from the supplier, it is generally filled with compressed air full of moisture and another pollutant. Purging helps to remove all Air pockets, moisture, and pollutants from the gas line.

What Happens If You Don’t Purge A Propane Line?

What Happens If You Don't Purge A Propane Line

If a propane line is not purged, there can be a buildup of air and other gases in the line that can cause an explosion or fire. Additionally, any contaminants in the line can cause damage to the equipment in use, resulting in costly repairs or replacements.

Until the purging has not happened before filling the gas line with propane, the supply line may experience combustion issues or pressure abnormalities. Purging the air from the pipes eliminates any air bubbles and ensures a steady propane supply. Also, you might not detect a gas leak if you do not purge the gas line correctly.

When purging a propane line, following the proper procedures to remove all the air and other gases is important. This can involve using a special tool or simply opening the valve and allowing the gas to flow for some time. Most importantly, a qualified professional should only purge propane lines to complete the process safely and effectively.

When To Purge?

When you buy a new gas pipe, you should always purge it. Changing the valve might also be another reason to purge your gas line. When we expose a line to the environment for whatever reason, we must purge it again before refilling it with new gasoline.

This also implies older gas lines. Purging air from a propane gas line is important in ensuring your propane system’s safe and efficient operation if you notice any air signs in your gas line, such as weak or inconsistent flames or hissing noise.

Purging propane lines properly before use is important to prevent potential hazards. If a propane line is not purged, there can be a buildup of air and other gases in the line that can cause an explosion or fire. Additionally, any contaminants in the line can cause damage to the equipment being used, resulting in costly repairs or replacements.

How To Purge Air From Propane Gas Line – An Insider’s Guide

How to Purge Air From Propane Gas Line – An Insiders Guide

Purging a gas line removes air from the line to ensure filling it only with propane or natural gas. Air in the line can cause issues with the performance of your gas appliances, such as reduced efficiency or even complete failure to operate. To purge your gas line, turn off all gas appliances and open the propane tank or natural gas line valve.

Purge all air from the line by allowing a steady stream of gas to flow through it. It is important to take caution when performing this task and follow all safety guidelines to avoid accidents. If you are unsure how to purge your gas line properly, consult a professional.

1. Estimated Cost

Estimated Cost

Usually, you need to pay 4$ per gallon to purge your gas lines. Depending on the length of the gas line and service cost, you might need to pay a lot more. If you are experiencing issues with your propane gas line, such as low pressure or a weak flame, purging air from the line may be necessary.

While you can do this often at home with the right tools and knowledge, it is important to note that the estimated cost of hiring a professional can vary depending on several factors.

2. Time Needed

Time Needed

As the gas starts to flow, you might need between 1 to 10 minutes to purge propane out of the gas lines. On average, most experts need three full minutes to complete the process.

If you’re experiencing issues with your propane gas line, purging air from the system may be necessary. The time needed to complete this process will depend on the size and complexity of your system and the amount of air you need to remove.

In general, purging air from a propane gas line can take a few minutes to several hours. It is important to follow all safety protocols during this process, including turning off all ignition sources and ensuring proper ventilation.

3. Tools And Materials

Tools And Materials

You do not need any tools to purge a gas line. All you have to do now is learn how to safely purge the air from the gas line using the gas pressure. It would be best if you had propane vapor. Even though the container keeps propane as a liquid, one can only perform purging using propane vapor.

Steps To Proceed With The Purging

How To Purge Air From Propane Gas Line


If you’re experiencing issues with your propane gas line, air may have become trapped inside. This can cause disruptions in the flow of propane and lead to issues such as low heat output or a weak flame.

Fortunately, purging air from a propane gas line is relatively simple. To begin, turn off any appliances connected to the gas line and shut off the main propane supply valve. Here are the steps to proceed with the purging:

Step 1: Prepare Your Environment

Prepare Your Environment


The purge should begin in a secure, controlled environment away from heat and ignited equipment. That’s why you must ensure you’re in a well-ventilated area with no open fires.

It is not suggested for anyone who doesn’t have experience with gas plumbing to purge a gas line indoors as it could be a dangerous process. If you purge the line indoors, there’s a chance you’ll face health-related issues.

Step 2: Protect Yourself


Wear goggles and gloves to protect your eyes and hands. If you are starting, take precautions to protect your skin because propane is a deadly gas if not handled properly.

Protective gears are necessary to do the job. When purging air from a propane gas line, it is important to take safety precautions to protect yourself from potential hazards.

Before beginning the process, ensure that you turn off all ignition sources and there are no open flames in the area. By taking these steps, you can help ensure the safe and effective completion of purging air from your propane gas line.

Step 3: Gas Valve Control Knob

Gas Valve Control Knob

To discharge propane into your gas lines, push the gas valve control knob in and hold and rotate the valve counterclockwise as far as it will go. You have to continue this process till “Pilot” or “Ignition” appears in the “On” position.

When maintained in this position, you should push the knob inward a quarter of an inch. The continual flow of propane will force all the air in the line out and into the atmosphere.

Locate the gas valve control knob near the propane tank or the appliance, which is the gas line connection. Once the knob is located, it should turn off to prevent gas from flowing through the line during purging. Next, the technician must connect a purging device to the gas line. 

Step 4: Purging


This device is designed to remove any air or other contaminants that may be present in the line. The device is connected to the gas line at one end and a compressed air source at the other. The air is then forced through the line, pushing out any contaminants that may be present.

You must press the igniter button constantly while pressing the valve control knob until the pilot ignites. As the gas starts to flow, it might take an average of 3 minutes to purge air out of the pipes, as we’ve told you before.

If you are experiencing issues with your propane gas line, purging the air from the system may be necessary. You can do this process relatively quickly, but it is important to follow the proper steps to ensure you can do it safely and effectively.

Step 5: Finishing

Turn off the gas flow after extracting all the air from the line. After the pilot has ignited, press the valve knob inward for 30 seconds before releasing it. Now that you have lit the pilot light turn the valve to the “On” position. If the pilot light goes out, restart the process.

You can also connect your propane line to a grill to burn off the extra propane. You can repeat this process a minimum of five times. The spark igniter might be the issue if gas flows out of the pilot, but it isn’t lighting. You’ll need to clean away any debris or air between the igniter and the safety pilot system.

There is another way also. You could alternatively apply a continuous flame to the thermocouple to purge the propane via the gas valve, although this occasionally results in burnt brows and mustaches.

Step 6: Last Check


Please securely attach the line to the nozzle on the top of the propane tank. Let the line leak into the atmosphere by leaving the other end open. After purging the propane gas line, it is important to perform a final check to ensure that no air remains in the line. To do this, turn on all of the gas appliances in your home and check each one for proper operation.

If appliances malfunction, turn off the gas supply and repeat the purging process. It is also important to monitor the propane tank levels and refill them as necessary to avoid running out of gas during use. Following these steps and regular maintenance on your propane system can ensure a safe and efficient operation for years.



Using natural gas through a gas line comes with its dangers. If you follow the directions and cautions, you can reduce these dangers to a minimum. Before you begin, have a look at them.

When purging air from a propane gas line, it is important to take certain precautions to ensure your safety. Here are some warnings to keep in mind:
Propane gas is highly flammable and dangerous if not handled properly. Make sure to follow all safety guidelines provided by your propane supplier.

  • Before starting the purging process, turn off all appliances connected to the propane gas line.
  • When releasing the air from the gas line, ensure you are in a well-ventilated area and avoid inhaling fumes.
  • Use caution when lighting pilot lights or restarting appliances after purging the air from the gas line.

Following these warnings and taking the necessary safety precautions, you can safely purge air from your propane gas line and ensure your appliances function properly.

Call For Experts

Call For Experts

The first step is to save your user manuals for any gas-powered appliances in your home. Contact a heating or gas contractor to ensure the gas line is safe.

Also, if your gas comes from a propane tank, check it with a propane service before you start using it, particularly if it has been idle for over two months.  Set up a regular production schedule with your propane supplier to guarantee that your propane tank and delivery equipment are in good operating order.

Check Propane Lines For Leaks

Check Propane Lines For Leaks

After you replace the gas tank, inspect your propane lines for leakage. If you detect the odor of gas, there is a leak.  Propane has a pungent, foul smell, similar to rotten eggs or dead animals. This odor is intentionally introduced to assist consumers in detecting propane leaks.

Always be aware of even the tiniest gas odor. Whether you smell gas, collect everyone in the home, including dogs, and leave immediately. If windows are open, leave them open, but do not stop to open them. If you don’t know where your gas comes from, call your energy supplier or emergency services immediately.

Safety Tips

There are a few ways to purge air from a propane gas line. The simplest and most common method is to use a plunger. Plungers have a narrow opening that allows gas to flow through but prevents dirt, debris, and air from entering the line. You can buy plungers at most hardware stores or home improvement stores.

Like most homeowners, you probably rely on propane to heat your home in the winter. Unfortunately, propane can also be a dangerous fuel if it’s not properly handled – which is why it’s important to know how to purge air from a propane gas line. Here are some tips to keep you and your family safe:

  1. Make sure to cap the cylinder properly, especially when it’s unused. This will prevent any gas from escaping and potentially igniting.
  1. Check the pressure regulator – If the pressure regulator fails, gas could escape from the tank and create a dangerous fire. Always check the pressure regulator to make sure it’s working correctly.
  2. Check for leaks – If there are any leaks in the system, gas could escape and create an explosive situation. Always check for signs of leaks and fix them as soon as possible.
  3. Keep a propane supply on hand – Have propane on hand in emergencies. This way, you’ll never have to worry about running out of fuel and risking an explosion or fire.

Wrapping Up

Purging air from a propane gas line is an important task that should be done carefully to ensure your equipment’s safety and proper functioning. Following the steps outlined here, you can effectively purge air from your propane gas line and prevent potenti. Alwayser always prioritize safety consult with a professional if you have any concerns or questions. With these tips, you can keep your propane gas line working smoothly and efficiently for years.

We hope you’ve figured out how to purge air from the propane gas line. Keep an eye out for those warnings, and follow the instructions carefully. Purging your gas lines and other appliances properly will make your home safer, without a doubt.

Frequently Asked Questions

1.In the Winter, Can I Keep My Gas Tank Outside?

Ans: If you’re keeping your grill outside for the winter, leave the propane tank attached (but turned off) and cover it with a protective cover once you’re done cleaning it. If you’re going to store the grill indoors, don’t bring the tank with you, even if it’s in the garage or a storage shed.

2.Is It Possible That Gas Lines May Become Clogged?

Ans: Water running into an underground gas supply pipe of an outdoor gas light or appliance may cause a clog or corrosion that clogs the line. A natural gas line can become clogged with only 4″ water pressure.

3.What Causes Fuel Line Air Bubbles?

Ans: Any air leak on the vacuum side of the fuel system from the fuel tank pick-up to and including the lift pump causes air bubbles. The fuel gallery’s gasoline return (spill) hose may also include air bubbles.

4.How Does Air Get In Rv Propane Lines?

Ans: RV propane lines are susceptible to air getting in them in a few ways. The most common is when the delivered gas displaces the air. This can happen when the lines are flexed or when they are kinked.

Another way air can get in the lines is when a leak is present and gas escapes and enters the line. Finally, the gas can enter through the regulator if it isn’t sealed.

5.Do You Need To Bleed RV Propane Lines?

Ans: Bleeding RV propane lines is unnecessary, but it can be helpful in several circumstances. For example, it can help to clean out the lines, prevent gas from entering the system in obscene amounts, and protect the system from freezing. Additionally, it may be necessary to bleed the lines if they become blocked.

Leave a Comment