What is the preferred medium to remove debris from a new instrument air line prior to service?

The preferred medium to remove debris from a new instrument air line prior to service is air. Utilizing air as a cleaning medium helps to ensure that any particles, dust, or contaminants are effectively blown out from within the line. Compressed air can dislodge and carry away debris that may have settled during the installation process or from manufacturing residues. This method is quick, efficient, and does not introduce any additional substances that could react or leave residues that might affect the instrument's performance.

On the other hand, using water could introduce moisture into the air line, which is detrimental since instrument air systems must remain dry to prevent corrosion or failure of sensitive components. Alcohol might not be effective as a cleaning agent for all types of debris and could also leave residues. Dilute caustic could be too harsh and damage the internal surfaces of the air line, which could lead to further complications during operation. Therefore, air is the safest and most effective choice for ensuring that the air line is clear and ready for service.