The first Standardization of Cast Iron water Pipes in Britain occurred in 1917 with the publishing of BS 78. This Standard specified a dimensionless nominal size, which approximately corresponded with the internal diameter in inches of the Pipe, and four pressure classes, Class A, Class B, Class C and Class D, each with a specified wall thickness and outer diameter. It is noted that the outer diameter is identical between classes with the exception of sizes 12 to 27, where Classes A and B share one diameter and Classes C and D have another, larger diameter.

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