When inspecting a nitrogen pad system on a large storage tank and no pressure is found, what critical item should be checked besides the regulator?

When inspecting a nitrogen pad system and discovering that there is no pressure, checking the supply pressure is critical. The supply pressure ensures that nitrogen is available to the system and is essential for maintaining the proper operating conditions of the pad system. Adequate supply pressure confirms that the nitrogen source is functional and capable of delivering the required gas to the storage tank.

If the supply pressure is absent or inadequate, it indicates a potential issue upstream of the regulator, such as a depleted nitrogen cylinder or a failure in the supply line. This can help identify whether the nitrogen pad system can be re-pressurized or if further investigation is necessary to resolve the underlying issue. Understanding the supply pressure is vital for effective maintenance and operation of the nitrogen pad system, ensuring the integrity of the storage tank and preventing internal oxidation or contamination.

In this scenario, focusing on elements like the tank lid, level transmitter, or pump strainer, while they may play roles in the overall system, would not immediately address the root cause of the no pressure situation in the nitrogen pad system. Therefore, verifying the supply pressure is the most relevant next step in troubleshooting.