A Christmas tree controls the well wherever it sits. Compare surface (API 6A) and subsea (API 17D) trees: access, valves, control, intervention, ratings and why the design work moves upstream.
Surface Tree vs Subsea Tree: What Changes When the Well Moves to the Seabed Read More »
Rapid Global benchmarked a manufacturer’s centrifugal pumps against competitors, cut weight 5% with FEA-validated optimisation, reduced inventory 7%, and converted 2,600+ legacy 2D drawings into 3D models and ASME Y14.5 drawings.
Case Study: From Benchmark to Build-Ready, a Lighter, More Reusable Pump Range Read More »
How Rapid Global upgraded decades-old gate valve drawings into parametric Creo 3D models and controlled PDF drawings, optimised tolerances and forgings, and brought the documentation up to API 6A in a 1,670-hour project.
Case Study: Upgrading Legacy Gate Valve Drawings to Creo 3D Models and API 6A Read More »
Pitch diameter, tooth depth, tip and root diameters, base circle, pitch, ratio, centre distance and contact ratio, calculated step by step for a real 20/40-tooth spur gear pair, with the full video walkthrough.
Spur Gear Calculations: A Worked Example in 8 Steps Read More »
A plain guide to oil well packers: what a packer does, its key parts, permanent vs retrievable designs, setting methods and API 11D1 validation grades.
Oil Well Packers: What They Are, How They Work and the Main Types Read More »
How an API 6A gate valve works: labelled parts diagram, open vs closed, slab gate metal-to-metal sealing, stem packing and API 6A rules. Free PDF.
API 6A Gate Valve: How It Works, Parts and Sealing Read More »
How Rapid Global defined unclear requirements and delivered the design, P&ID and 3D CAD model for a 5K wellhead control panel, now installed in the UAE.
Designing a Wellhead Control Panel for a 5,000 psi Surface Wellhead in the UAE Read More »
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
Introduction to API 6A: Specification for Wellhead and Christmas Tree Equipment Read More »
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:
Pitch Diameter, Tap Drills, and the Logic Behind Our Unified Thread Calculator Read More »
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
API 6A vs. API 17D: Surface Wellhead vs. Subsea Wellhead Standards Read More »