What may result in difficulty filling an ASME tank with a non-restricted float-type OPD?

The situation described involves the operation of an ASME tank equipped with a non-restricted float-type Overfill Prevention Device (OPD). These devices are designed to automatically stop the fill process once the tank reaches a certain level, preventing overfilling and ensuring safety. If the OPD stops the filling prematurely, it may lead to difficulty in filling the tank completely, as the device is performing its intended safety function. This automatic shutdown could be due to a variety of factors, including a misalignment of the float or an obstruction that causes the OPD to engage at a lower volume than desired.

Understanding the role of the OPD is crucial, as it highlights the importance of proper filling techniques and equipment functionality. It also emphasizes the need for technicians to ensure that the float mechanism is operating correctly to avoid unnecessary interruptions during the fill process. Proper training and attention to these devices help maintain safety standards in propane storage and delivery.