Introduction
Buying used kegs can be a cost-effective and eco-friendly choice for breweries, event organizers, and homebrewers alike. However, ensuring that these kegs are in good condition is crucial to avoid potential issues such as leaks, contamination, or structural failures that could impact your business or brewing process. This article serves as a comprehensive guide to help you inspect used kegs before purchasing, ensuring that you invest in high-quality products that meet your specific needs. We’ll walk you through key steps, common pitfalls, and expert tips to guarantee that your kegs are ready for use.
1. External Inspection: Checking for Visible Damage
The first step in inspecting a used keg is a thorough external inspection. Over time, kegs are subjected to various stresses during transportation, handling, and use. External damage, such as dents, deep scratches, and corrosion, can indicate that the keg has been mishandled or improperly stored.
What to Look For:
- Dents: While minor dents may not affect functionality, larger ones can compromise the structural integrity of the keg. A keg with significant denting may be at risk of leaks or failing under pressure.
- Scratches and Rust: Stainless steel kegs should be resistant to rust, but if a keg has been scratched deeply, it may have exposed the metal to corrosion. Rust can also indicate that the keg has not been stored in a dry or controlled environment.
- Corrosion: If you spot corrosion around the welds or fittings, this can be a red flag. Rust not only affects the appearance but can lead to long-term structural weaknesses.
Tools for External Inspection:
- Use a flashlight to inspect less visible areas, such as the bottom of the keg.
- Employ a small mirror to check hard-to-reach sections for hidden damage.
Key Tip:
Minor cosmetic issues are acceptable for used kegs, but any deep structural damage could mean future problems. Inspect thoroughly to ensure the keg’s body will hold up under pressure.
2. Fittings and Seals | Inspect Used Kegs
The keg’s fittings and seals are critical for maintaining a secure, pressurized environment that keeps beverages fresh and carbonated. Poor-quality fittings or damaged seals can lead to leaks, contamination, and loss of carbonation, affecting the quality of the stored beverage.
What to Look For:
- Fittings: Check all the keg’s connections, including the valve and coupler fittings. Ensure they are not corroded, cracked, or excessively worn. Fittings that don’t properly connect to dispensing equipment can be a major problem.
- Seals and O-rings: These should be intact and not dried out, cracked, or otherwise damaged. Poorly functioning seals will allow air to enter the keg, which can spoil the beer or beverage inside.
How to Check:
- Remove the valve or coupler to get a better look at the O-rings and seals.
- Feel for any brittleness or signs of wear.
Common Problems:
- Worn Seals: Over time, seals degrade, especially if kegs are exposed to harsh cleaning chemicals or stored improperly. Always check seals before use, as this is a common source of leaks.
- Improper Fittings: Ensure that fittings are standardized and compatible with your dispensing system. Incompatible fittings can lead to spillage or loss of pressure.
3. Pressure Valve Testing | Inspect Used Kegs
A properly functioning pressure valve is critical to the performance of the keg. The valve regulates the amount of pressure inside the keg and ensures the liquid stays carbonated and fresh.
What to Look For:
- Integrity of the Pressure Valve: Check that the valve is clean and moves smoothly. It should create a tight seal when the keg is pressurized, with no leaks.
- Valve Springs: These can wear out over time. Make sure the spring mechanism is intact and offers the appropriate resistance.
- Check for Leaks: If possible, pressurize the keg with CO2 and listen for any hissing sounds, which indicate leaks around the valve or fittings.
Common Issues:
- Valve Malfunction: A stuck or broken valve can cause issues with dispensing or lead to dangerous over-pressurization.
- Leaking Pressure Valve: This can lead to flat beer or improper storage of other beverages, reducing product quality.
4. Interior Inspection for Contamination | Inspect Used Kegs
One of the most crucial aspects of keg inspection is ensuring the interior is clean and free from contamination. Even small residues from the previous beverage can spoil new contents or introduce bacteria, which can compromise the taste and safety of the product.
What to Look For:
- Residue or Film: Check for any leftover film or residues inside the keg. Beer stone, a hard, crusty buildup that occurs from calcium deposits in beer, is particularly difficult to remove and can affect new beverages.
- Odor: Smell the inside of the keg. If it has a musty, sour, or off-putting smell, the keg likely hasn’t been cleaned properly.
- Mold or Bacteria Growth: Look for signs of mold or bacterial growth, which can occur if the keg has been stored improperly after use.
How to Check:
- Use a flashlight to inspect the interior carefully. Look for any signs of discoloration, residue, or imperfections.
- Smell the keg for any lingering odors that could indicate poor cleaning.
Cleaning and Sterilization:
- Even if a used keg looks clean, it’s a good idea to sanitize it before use. This can involve cleaning with a dedicated keg cleaning solution and sanitizing using pressurized CO2 or a keg washer.
Supporting Data:
According to a study by the Brewers Association, proper keg cleaning can extend the lifespan of a keg by up to 15%, making it a crucial part of keg ownership. Source
5. Inquiring About the Keg’s History | Inspect Used Kegs
Whenever possible, ask the seller for details about the keg’s previous usage. Knowing the history of a keg can provide valuable insights into its current condition and longevity.
Questions to Ask:
- Usage: How often was the keg used? A keg that’s been used frequently may have more wear and tear than one that was only used occasionally.
- Maintenance: Has the keg undergone regular maintenance, including proper cleaning and repairs? A well-maintained keg is more likely to be in good condition.
- Refurbishment: If the keg has been refurbished, ask for details about the process. Refurbished kegs can be an excellent investment, but the quality of the refurbishment matters.
6. Testing the Keg Before Purchase | Inspect Used Kegs
If possible, test the keg before purchasing to ensure it functions as expected. This may involve pressurizing the keg, attaching it to a tap system, or simply filling it with water to check for leaks.
How to Test:
- Pressurization Test: Attach a CO2 system to the keg and pressurize it to ensure the seals and valves hold pressure without leaking.
- Liquid Test: Fill the keg with water and let it sit for a few hours. Check for any signs of leakage or pressure loss.
Conclusion
Inspecting used kegs before purchasing is essential for ensuring they are safe, functional, and ready for use. From external damage to internal contamination, paying close attention to every detail can save you from costly mistakes down the line. By following these steps and asking the right questions, you can invest confidently in high-quality used kegs that meet your brewing or beverage needs.
