Which two pieces of information are needed before laying out a tee?

• A. Gauge of metal and type of insulation
• B. Color of insulation and finish
• C. Temperature rating and pressure
• D. Diameter and thickness of pipe

Answer: (A)

Before laying out a tee, you need to know how thick the pipe wall is (gauge) and what kind of insulation will be applied. The gauge of the metal tells you the exact outside dimensions and how the tee will fit with the existing pipe, including how much space the branch take-off will require and how the connected parts align. The type of insulation determines how bulky the wrapped pipe will be and how the insulation will terminate around the tee, branches, and fittings. Different insulation materials have different thicknesses, compressibility, and jacket requirements, which affect the overall footprint and clearance you must maintain in the layout. Knowing both helps you accurately sketch the layout, ensure proper fit, and maintain continuous insulation around the branch.

Color of insulation and finish don’t affect fit or spacing. Temperature rating and pressure are design constraints for material selection but don’t directly dictate the physical layout in terms of fitting the tee with the insulation. Diameter and thickness of the pipe are important, but in this context gauge plus insulation type specifically determine the envelope you must work within for laying out the tee.