How to Find and Fix Compressed Air Leaks

Air leaks are one of the most common reasons a compressor runs more than it should. In an untended system, leaks can waste a large share of the air you pay to make, and the compressor ends up working harder and wearing faster.

How to find a leak

• Listen. Switch the compressor off at the end of the day, then listen in a quiet workshop for hissing.
• Soapy water. Spray a mix of washing up liquid and water on joints. Bubbles show the leak.
• Pressure drop test. Fill the tank, close the outlet and switch off. If the gauge drops noticeably in a few minutes, something is leaking.
• Ultrasonic detector. Pick up leaks in noisy places where you cannot hear them.

The usual suspects

• Worn quick release couplings and adaptors
• Threaded joints with missing or old sealing tape
• Perished or cracked hoses, especially at the ends
• Hose clips that have loosened
• Drain valves and regulators
• Push-in fittings with badly cut tube

How to fix them

• Replace worn couplings. A coupling that hisses when connected is finished.
• Remake tapered thread joints with fresh PTFE tape or sealant. For parallel (BSPP) threads, fit a new bonded washer or O-ring. Our thread guide explains the difference.
• Cut back and re-fit hose ends, or replace the hose if it is cracked.
• Re-cut tubing square and push it fully into push-in fittings.
• Close off any unused outlets with a plug.

Make it a habit

A quick leak check every few months saves money and keeps your compressor in better shape. Add it to your maintenance routine.

We stock couplings, adaptors, hose and fittings to fix leaks. Call 021 435 5424 or visit Unit 705, Euro Business Park, Little Island, Cork (T45 NN60). Browse couplings.