Details
For elbows, wall-thickness measurements are taken using either precision calipers or point micrometers placed inside the tubes.
The outside diameters of elbows are measured at the center of their curves and with their ends facing upward. Measurements are taken using precision digital calipers.
The lengths of elbows are determined as the curvilinear distances between ends. Measurements are taken using either micro measuring wheels or strings and rulers.
To assure specified moisture, two batch samples are ground, weighed, heated in an air oven, placed in a desiccator and then re-weighed. Results are validated using two moisture validation machines.
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