A refinery is not one duty but a stack of them: crude units at moderate pressure and climbing temperature, conversion units hotter again, hydrotreating where hydrogen-bearing service belongs to specialists. This page is organised by unit, because that is how the duties actually differ — the medium pages carry the per-fluid compatibility detail.
The reference duty below is an atmospheric-distillation isolation point. Hydrotreating's hydrogen-bearing, high-pressure hot duties are flagged to engineering review rather than answered from a library that does not carry hydrogen.
Typical duties
| Crude and vacuum distillation | Crude oil · 10–40 bar · 200–370 °C · DN150–400 |
|---|---|
| Conversion and product lines | Hydrocarbons · 16–60 bar · 200–450 °C · DN50–300 |
| Hydrotreating and hydrogen-bearing service | High-pressure hot hydrogen duty — engineering review |
25 bar · 300 °C · DN250 on Crude Oil (liquid): Ball Valve (floating / trunnion-mounted) · body Carbon steel (ASTM A216 WCB) · Class 300.
bubble-tight quarter-turn isolation is the modern default for this duty
/* r11 P3-6 (user-approved): the duty-specific caution (e.g. class utilisation) belongs ON the page, not only in the unlocked report — the last boilerplate line stays report-only */Watch: Pressure-temperature ratings are screening values from published ASME B16.34 tables; flange standard, face-to-face dimension, fugitive-emission class and actuation sizing are all stated for the manufacturer to confirm, not decided here.
What to watch
- Temperature is the axis that moves: body-material ceilings and the B16.34 table do the deciding as it climbs.
- Flanged and butt-weld ends dominate; the end connection is a report field, not a selection constraint.
- Where the duty turns hydrogen-bearing and hot, the honest route is the inquiry channel — the library carries no hydrogen entry.
Where this connects on this site
- Crude oil as a medium — the compatibility table
- Gate valves — refinery isolation
- Globe valves — refinery regulation
- API 6D Enters US Pipeline Law: What Federal Adoption of the 25th Edition Changes
Boundary rule: this page states single-point conclusions from the site's knowledge base — no supplier names, no matrices. The full 40-medium library lives in the selector.