What is the purpose of a regulator equipped with a nitrogen tank?

• A. To increase the inlet pressure
• B. To maintain constant temperature
• C. To lower the outlet pressure
• D. To monitor mass flow

Answer: (C)

A regulator equipped with a nitrogen tank primarily serves to lower the outlet pressure of nitrogen as it is released from the tank. The purpose of this regulation is to ensure that the nitrogen is delivered at a safe and usable pressure for various applications, including in refrigeration and HVAC systems where nitrogen is used for pressure testing and purging.

When nitrogen is stored, it is often at very high pressures in the tank. The regulator allows technicians to reduce this high pressure to a level that is suitable for their needs, ensuring that the system operates safely and effectively. By controlling this outlet pressure, the regulator helps prevent damage to equipment that could occur from excessively high pressures.

Using nitrogen for purge or hold procedures in refrigeration systems is a common practice, and having the correct pressure is vital to ensuring the integrity and functionality of the systems being serviced. Thus, the correct answer highlights a critical function of the regulator in managing the output pressure for safe and effective operation.