Rapid Global

Introduction to API 6A: Specification for Wellhead and Christmas Tree Equipment

If you work on wellhead or Christmas tree equipment for more than a few months, “API 6A” stops being a document you occasionally reference and becomes the language you think in — pressure classes, material classes, PSL levels. For anyone newer to the specification, or anyone who wants a single clear reference to hand a

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Pitch Diameter, Tap Drills, and the Logic Behind Our Unified Thread Calculator

Every bolted flange, every stud, every tapped hole on a piece of pressure-control equipment depends on a thread that was cut correctly — and “correctly” starts with a handful of geometric relationships that are older and simpler than most of the software built around them. Our Unified Thread Calculator puts those relationships in one place:

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API 6A vs. API 17D: Surface Wellhead vs. Subsea Wellhead Standards

API 6A and API 17D cover the same basic function — wellhead and tree equipment — but for two environments different enough that neither standard alone is sufficient for both. Here’s how they divide the work, and why a subsea well needs more than just “API 6A equipment installed underwater.” API 6A: the surface baseline

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