Specifies the distance between the nozzle and base point along the X-axis. Type a positive value if the nozzle X-coordinate is greater than that of the base point, that is, if the nozzle is farther out on the positive X-axis.
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API 610 defines the base point as the center of the pump. The center of the pump is defined as the intersection of the pump shaft centerline and a vertical plane passing through the center of the two pedestals.
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When analyzing vertical in-line pumps, the software disables DX, DY, and DZ because the coordinates are not used.