Standards & Codes

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:

H40, J55, N80, L80, P110, Q125 — API 5CT casing and tubing grades read like a code because, functionally, they are one: a compact way of specifying a pipe’s strength, and in some cases its metallurgy, without writing out a full material spec every time. Here’s what the letters and numbers actually mean, and where

“I need this pipe to hold 5,000 psi — what wall thickness do I actually need?” is one of the most common early-design questions we get, and it’s really just our Internal Yield (Burst) Pressure formula run backwards. This post walks through solving Barlow’s equation for wall thickness instead of pressure, and where that number

Every string looks lighter once it’s in the hole. That’s not the rig lying to you — it’s buoyancy, and it’s why a driller’s hook-load reading never matches the pipe tally’s air weight once the string is wet. This post covers the shortcut oilfield engineers actually use to get from air weight to buoyed weight,

Every calculator on this site so far checks one failure mode at a time: burst, or collapse, in isolation. Real strings don’t fail that way — pressure and axial load act together, and a pipe that comfortably passes a burst check and a collapse check separately can still yield when both loads are on at