Rapid Global

Wellhead Equipment 101: Casing Heads, Tubing Heads, and Hangers Explained

A wellhead stack is a set of stacked pressure-containing spools and hangers, and the names of the main components — casing head, tubing head, hanger — get used constantly without always being explained. Here’s what each one actually does, and how they fit together. The basic idea: a wellhead is stacked, not built as one

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When Does Legacy Wellhead Equipment Need Design Re-Qualification?

Wellhead equipment often outlives the paperwork that qualified it. A stack installed fifteen or twenty years ago can still be structurally sound while the code edition it was designed to, the field’s production plan, or the equipment’s own service history have all moved on since. The question isn’t whether the equipment still works — it’s

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Choke and Kill Manifold Design: What Actually Goes Into Sizing One

A choke and kill manifold looks like a dense cluster of valves, chokes, and pipe spools, and sizing one properly means working through several interlocking decisions at once — pressure rating, choke sizing, redundancy, and line routing — each of which constrains the others. Here’s what actually goes into that. Start with the pressure rating

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Subsea Tree vs. Surface Tree: Key Design Differences Engineers Should Know

A subsea tree does the same fundamental job as a surface tree — controlling flow from the wellbore — but almost everything about how it’s designed to do that job is different, driven by one basic constraint: nobody can walk out and manually operate it. That single difference cascades into how it’s actuated, monitored, sealed,

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API TR 5C3 vs. ISO/TR 10400: Are They Really the Same Standard?

API TR 5C3 and ISO/TR 10400 both show up as the cited basis for casing and tubing burst, collapse, and tension calculations, and it’s a fair question whether picking one over the other actually changes anything. The short answer: for the core equations, no — ISO/TR 10400 was developed specifically to be the internationally-recognized equivalent

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