What would be the approximate time for purging a 1-inch NPS pipe at 100-feet?

To determine the approximate time for purging a 1-inch NPS pipe that is 100 feet long, one must consider the flow rate of the gas and the necessary calculations for purging time. Purging involves displacing the existing gas within the pipe with a new gas, and this is done at a sufficient flow rate to ensure complete purging.

The correct answer, which states 1 minute and 24 seconds, suggests a calculation based on a typical purging rate combined with the volume of the pipe and the velocity of the gas being used for purging. For a 1-inch diameter pipe, the volume can be calculated using the pipe's dimensions, and the expected purging velocity needs to be factored in to determine how quickly the gas will flow through the 100-foot length.

The answer reflects an appropriate estimate based on average industry practices and typical gas flow rates used in purging operations. The time of approximately 1 minute and 24 seconds provides a conservative and realistic duration to ensure that the purging process is thorough, allowing adequate time for the gas to effectively replace the existing gas throughout the length of the pipe.

Using this standardized approach ensures both safety and efficiency in operations where gas systems are involved, thus aligning with the