If you have a tank in the basement or outdoors, you’ve probably noticed a whistling sound on delivery day. While our guys are usually cheerful, it’s not them! What you’re actually hearing is your vent alarm — a key part of your heating oil storage system.
As oil flows into the fill pipe and starts filling your tank, air gets pushed out. That air goes through the vent alarm — located between your tank and the vent pipe — making a whistling sound. When the whistling stops, our driver knows the tank is just about full.
The vent alarm helps prevent spills. In fact, we are prohibited from delivering oil if it isn’t working.