What is the 4th ordinate cutback measurement for a 3'' diameter type 3 dummy leg on a 6'' elbow?

To determine the correct 4th ordinate cutback measurement for a 3" diameter type 3 dummy leg on a 6" elbow, it is important to refer to the appropriate cutback formulas and tables used in pipefitting.

The cutback measurement is derived from the specific dimensions and configurations of the pipe and fittings involved. For a type 3 dummy leg, which involves a 3" diameter pipe connected to a 6" elbow, there are established formulas that are applied to calculate the necessary cutbacks accurately.

The 4th ordinate is a specific cutback parameter used to achieve proper alignment and fitting of the pipe in conjunction with the elbow. Based on the standard measurements and configurations, the calculation yields a cutback measurement of 10 3/16, which corresponds to the unique requirements of a 3" diameter pipe interfacing with a 6" elbow.

Using the correct formulas ensures that the angle and length of the dummy leg are appropriate for a secure and effective fit, making option B the most suitable answer in this case. Understanding these measurement principles is essential for pipefitters to maintain accuracy in their work.