SGS Air Compressors: Oil & EU Changes

SGS Air Compressors: Understanding Oil Levels and EU Regulations

When investing in new workshop equipment, particularly an air compressor, one of the most common and crucial questions revolves around its initial state of readiness. Specifically, many users inquire whether their new SGS air compressor arrives with oil already in the system. This is a vital consideration, as operating a compressor without adequate lubrication can lead to catastrophic failure and void warranties. Fortunately, we can provide clarity on this matter, along with important information regarding recent legislative changes affecting air compressors in the UK and Europe.

Does a New SGS Air Compressor Come with Oil?

Yes, SGS air compressors are typically shipped with oil. However, this does not always mean they are ready for immediate, full-scale operation straight out of the box. The oil level provided at the factory is often a baseline amount, and it is imperative to check and potentially top up the oil before the initial start-up. This precautionary step ensures that the compressor’s internal components, particularly the crankshaft, pistons, and cylinder walls, receive sufficient lubrication from the very first rotation. Failure to do so can result in premature wear and damage.

SGS, as a reputable British company, understands the importance of user guidance. Their commitment is reflected in their comprehensive support, including readily available spares, a robust warranty system, and a dedicated service centre located at their East Midlands headquarters. This local support network means that any queries or issues you might encounter, including those related to initial setup and oil levels, can be addressed efficiently.

Why is Checking Oil So Important?

Air compressors, especially piston-driven models which are common in workshops, rely heavily on oil for several critical functions:

• Lubrication: The primary role of the oil is to reduce friction between moving metal parts. This prevents overheating and excessive wear.
• Cooling: As parts move rapidly, friction generates heat. The oil circulates, absorbing some of this heat and carrying it away, acting as a coolant.
• Sealing: A thin film of oil helps to seal the gaps between pistons and cylinder walls, improving compression efficiency and preventing blow-by.
• Corrosion Protection: The oil forms a protective layer on internal metal surfaces, preventing rust and corrosion, especially in environments where moisture might be present.

Without adequate oil, these functions are compromised, leading to:

• Increased friction and heat
• Rapid wear of critical components like pistons, rings, and crankshaft bearings
• Reduced compression efficiency
• Potential for seizure (the engine or compressor seizing up)
• Voiding of the manufacturer's warranty

What Type of Oil Should Be Used?

SGS typically recommends specific types of compressor oil to ensure optimal performance and longevity. Always refer to your SGS air compressor's user manual for the precise grade and specification. Generally, air compressors use specialized compressor oils, often designated as AW (Anti-Wear) or ISO VG (Viscosity Grade) rated oils. Using standard motor oil is not advisable as it may not withstand the high pressures and temperatures experienced within an air compressor and may not have the necessary additives for effective lubrication and sealing.

The viscosity of the oil is also crucial and will depend on the operating temperature. A common recommendation for many workshop compressors operating in typical ambient temperatures is an ISO VG 32 or ISO VG 46 oil. Again, consult your manual for the definitive answer.

Checking and Topping Up Oil: A Step-by-Step Guide

Here’s a general procedure for checking and topping up the oil in your SGS air compressor:

1. Ensure the Compressor is Off and Cool: Never attempt to check or add oil when the compressor is running or still hot from recent operation.
2. Locate the Oil Sight Glass or Dipstick: Most SGS compressors will have either a small transparent window (sight glass) or a dipstick, usually located near the crankcase.
3. Position the Compressor Correctly: For most compressors, the oil level should be checked when the unit is on a level surface. Some manufacturers may specify checking with the unit tilted slightly, so refer to your manual.
4. Check the Level:
   • Sight Glass: The oil level should be visible within the marked range on the sight glass, typically between the minimum and maximum lines.
   • Dipstick: Unscrew and remove the dipstick. Wipe it clean, reinsert it fully, and then remove it again. The oil level should be between the 'Min' and 'Max' marks on the dipstick.
5. Top Up if Necessary: If the oil level is low, carefully add the recommended compressor oil using a clean funnel. Add small amounts at a time, re-checking the level frequently until it reaches the correct mark. Do not overfill. Overfilling can lead to oil being carried over into the compressed air lines and can also cause internal pressure issues.
6. Secure the Cap/Dipstick: Once the correct level is achieved, securely replace the oil filler cap or dipstick.
7. Run the Compressor Briefly: After topping up, run the compressor for a few minutes. Then, turn it off and re-check the oil level. Sometimes, the oil can settle into the system, and a slight top-up might be needed again.

Important Note: Changes to Safety Valve Rings Due to EU Legislation

You may have noticed, or will notice, that newer air compressors, including those from SGS, no longer come fitted with safety valve rings. This is a direct consequence of a change in EU legislation. All manufacturers of air compressors have been required to remove these rings. Previously, these rings were designed to be removed by the user to limit the maximum pressure the compressor could achieve, acting as a secondary safety measure. However, the updated regulations have mandated their removal from the manufacturing stage.

What does this mean for you?

• No User-Adjustable Pressure Limiting: The safety valve rings are no longer present to limit the maximum pressure. The compressor's operation is now solely governed by the factory-set pressure switch and the primary safety relief valve.
• Importance of the Pressure Switch: The pressure switch is the primary control mechanism that stops the motor when the tank reaches its maximum set pressure and restarts it when the pressure drops. Ensure this is functioning correctly.
• Function of the Primary Safety Relief Valve: This valve is a critical safety device designed to automatically release excess pressure if the pressure switch fails. It is usually set to a pressure slightly higher than the pressure switch cut-out point. It is essential that this valve is functional and not tampered with.
• Compliance: By removing the rings, manufacturers are complying with current EU (and by extension, UK) safety standards.

While the absence of the rings might seem like a reduction in safety, it is actually a move towards standardized safety features. The onus is now entirely on the integrity and correct functioning of the pressure switch and the main safety relief valve. Regular maintenance and testing of these components are therefore even more crucial.

Maintenance Schedule for SGS Air Compressors

To ensure your SGS air compressor operates safely and efficiently, adhering to a regular maintenance schedule is key. Here's a general guideline:

Frequently Asked Questions (FAQs)

Q1: My SGS compressor seems to be losing pressure quickly. What could be the cause?
This could be due to several reasons: a leak in the airline or fittings, a faulty non-return valve, or an issue with the piston rings or cylinder seals. Regularly checking for air leaks with soapy water and ensuring the oil level is correct can help diagnose the problem.

Q2: Can I use any type of oil in my SGS compressor?
No, it is crucial to use the specific type of compressor oil recommended in your SGS user manual. Using the wrong oil can lead to poor lubrication, overheating, and damage to the compressor.

Q3: What is the purpose of the safety valve rings that have been removed?
These rings were designed as a user-adjustable limiter for the maximum pressure. Their removal is due to updated EU legislation, with safety now relying solely on the pressure switch and the primary safety relief valve.

Q4: How often should I drain the air tank?
It is recommended to drain the condensate from the air tank after each use, or at least daily. Accumulated moisture can lead to tank corrosion and potential safety hazards.

Q5: Where can I find spare parts or warranty information for my SGS compressor?
As SGS is a British company with a base in the East Midlands, you can find comprehensive information regarding spares, warranty, and service directly through their official channels or by contacting their customer support.

Conclusion

In summary, while your new SGS air compressor will likely arrive with some oil, it is a critical step to always check and potentially top up the oil level before its first use. Understanding the importance of proper lubrication and adhering to a regular maintenance schedule will ensure your compressor performs reliably for years to come. Be aware of the recent legislative changes regarding safety valve rings, and place your trust in the correctly functioning pressure switch and primary safety relief valve. With proper care and attention, your SGS air compressor will be a valuable asset to your workshop.

If you want to read more articles similar to SGS Air Compressors: Oil & EU Changes, you can visit the Automotive category.