28mm will be the outside diameter. In the UK, depending on what BS standard the pipe is designed to, the thickness of the copper will be either 0.9mm or 1.2mm, the same as for 22mm pipe. assuming to thicker later type, then the internal diameter would be 28mm - (2*1.2mm) = 25.6mm
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depends on liquid/gas and pressure. natural gas and high pressure = lots thick oil and low pressure = no much
The diameter of a pipe is its width across an open end of the pipe. The inside diameter is the width measuring on the inside of the pipe; the outside diameter is the width measuring on the outside.______________________________________________________________________________________________________For a pipe of circular cross section, its nominal diameter is the diameter of the cross section.The inner diameter is the measuring on the inside of the pipeThe outside diameter is the measuring on the outside of the pipe.
Calipers are used to measure the dimension of anarticle. In measuring a section of pipe you would use an inside caliper to give the internal diameter, and an outside caliper to give the external diameter. The difference being the thickness of the pipe wall.
The inside diameter (ID) is 8 inches. The nominal pipe size (NPS) and outside diameter (OD) depend on the thickness of the walls of the pipe.