What information is needed before a tee is laid out?

• A. Gauge of metal and type of insulation
• B. Color of insulation
• C. Temperature rating
• D. Pressure rating

Answer: (A)

Before laying out a tee, you need to know the pipe’s gauge (wall thickness) and the insulation type you’ll use. The gauge determines the pipe’s external size and how the tee branches must align with the existing run, while the insulation type sets the overall thickness and how the insulation and jacket will be cut around the tee. This information ensures accurate dimensions and clean seams in the insulation job. The color of the insulation is cosmetic and not needed for layout, the temperature rating affects suitability but not the layout geometry, and the pressure rating is a design spec for the system, not the physical layout of the tee.