When using the OPD what is a good back up measure?

When using the OPD what is a good back up measure?

• A. The vent on the fixed maximum liquid level gauge should always be open
• B. The vent should be closed during operation
• C. The regulator should be replaced periodically
• D. The system should be checked by a technician monthly

Answer: (A)

When you’re using the OPD, the extra safeguard you rely on is having the vent on the fixed maximum liquid level gauge open. The OPD automatically stops the fill at about 80% of the tank’s capacity, but leaving this vent open gives a dedicated path for any vapor displaced during filling to escape safely. This helps prevent pressure from building up inside the tank and reduces the chance of overfilling or venting issues, even if the OPD momentarily cycles or the temperature changes during the fill. In short, an open vent provides a controlled outlet for gas, enhancing safety beyond what the OPD alone achieves.

When you’re using the OPD, the extra safeguard you rely on is having the vent on the fixed maximum liquid level gauge open. The OPD automatically stops the fill at about 80% of the tank’s capacity, but leaving this vent open gives a dedicated path for any vapor displaced during filling to escape safely. This helps prevent pressure from building up inside the tank and reduces the chance of overfilling or venting issues, even if the OPD momentarily cycles or the temperature changes during the fill. In short, an open vent provides a controlled outlet for gas, enhancing safety beyond what the OPD alone achieves.