What must be done to the surfaces of pipe, tubing, and fittings before installation?

The surfaces of pipe, tubing, and fittings must be brushed and cleaned before installation to ensure proper connections and prevent leaks. This step is essential for several reasons:

First, contaminants such as dirt, dust, grease, or oxidation can interfere with the sealing surfaces, leading to compromised joints that may fail under pressure or flow conditions. Thorough cleaning promotes better surface contact, ensuring that the seals can achieve their intended tightness.

Second, when surfaces are clean, they are more conducive to applying joint compounds or sealing materials where necessary, which enhances the overall integrity of the installation. Smooth, debris-free surfaces assist in achieving proper alignment and fit, minimizing the risk of future maintenance issues.

While coating surfaces with grease might be useful in specific applications, it is not a standard practice and could lead to issues. Painting and treating surfaces can also be inappropriate as these coatings can hinder proper seals and fittings. Wrapping and insulating may apply to specific systems but does not address the critical need for clean surfaces during initial installations. Thus, brushing and cleaning prior to installation remains the best practice.