What is the maximum pipe size (in inches) that must be non-corrosive?

What is the maximum pipe size (in inches) that must be non-corrosive?

• A. 1/4
• B. 3/8
• C. 1/2
• D. 3/16

Answer: (B)

Corrosion resistance is required in small-diameter piping because tiny lines run to sensitive components and any rust or buildup can interfere with performance. Codes set a size threshold for when a pipe must be non-corrosive, so only pipes up to that diameter must use non-corrosive materials. The largest size that falls under this requirement is 3/8 inch, so any pipe 3/8 inch or smaller must be non-corrosive. A 1/2 inch line is not included in that requirement, which is why it isn’t considered in this rule. The other smaller options are simply below the threshold, but 3/8 inch represents the maximum size that must be non-corrosive.

Corrosion resistance is required in small-diameter piping because tiny lines run to sensitive components and any rust or buildup can interfere with performance. Codes set a size threshold for when a pipe must be non-corrosive, so only pipes up to that diameter must use non-corrosive materials. The largest size that falls under this requirement is 3/8 inch, so any pipe 3/8 inch or smaller must be non-corrosive. A 1/2 inch line is not included in that requirement, which is why it isn’t considered in this rule. The other smaller options are simply below the threshold, but 3/8 inch represents the maximum size that must be non-corrosive.