Why is galvanized pipe measured in inches?
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As the title suggests, why are galvanized pipes measured in inches, such as 4 fractions, 6 fractions, 1 inch, 2 inches, etc., while seamless steel pipes or stainless steel pipes use metric standards, with Φ indicating the outer diameter or DN indicating the nominal diameter?
There is no such saying; both can be expressed using inches or DN
It doesn’t specify whether that material should be specified in metric units (MM) or imperial units; either is acceptable!
Why is everything I come across measured in centimeters?
Reply to 1# wzksoul: As the title suggests, why are galvanized pipes measured in inches, such as 4 fractions, 6 fractions, 1 inch, 2 inches, etc., while seamless steel pipes or stainless steel pipes use metric standards, with Φ indicating the outer diameter or DN indicating the nominal diameter? 4 fractions and 6 fractions are informal terms; the standard designations are 1/2 inch and 3/4 inch pipes. These two types of galvanized pipes are most commonly used in residential plumbing installations. The diameter of pipes is characterized by parameters such as the nominal diameter and outer diameter; these are generally expressed in either metric or imperial units. Pipes manufactured in accordance with national standards are specified using metric units, as outer diameter X wall thickness. Pipes produced according to American standards are specified using imperial units, as nominal diameter X outer wall thickness (the actual outer diameter and wall thickness values need to be looked up in tables). Pipes within the same diameter series have the same outer diameter; it is the wall thickness that varies, resulting in different inner diameters.