According to the Uniform Mechanical Code, when 1 1/2″ pipe is used for conveying liquid refrigerant and all field joints are welded, the minimum wall thickness permitted shall not be less than the thickness used in schedule ____ pipe.

According to the Uniform Mechanical Code, when 1 1/2″ pipe is used for conveying liquid refrigerant and all field joints are welded, the minimum wall thickness permitted shall not be less than the thickness used in schedule ____ pipe.