Overview
A flange is the interface between titanium pipework and everything else, so it has to match the system it bolts into: the same dimensional standard, the same pressure class, the same facing and the same bolt circle. That is why flange enquiries should always state the standard rather than just the outside diameter.
Flanges are machined from forged or rolled blanks, which means the same enquiry can cover both the flange and the pipe it will join — useful when a fabrication package is being sourced in one go.
Flange types
| Type | Where it is used | Notes |
|---|---|---|
| Weld neck (WN) | Higher pressure and cyclic service | Long tapered hub, butt-welded to the pipe; the strongest joint |
| Slip-on (SO) | General low and medium pressure service | Pipe passes through and is fillet-welded both sides |
| Blind | Closing a line end, inspection openings | Solid disc, drilled for the bolt circle |
| Plate flange | Low-pressure and non-code service | Simplest and most economical form |
| Lap joint / stub end | Systems needing frequent dismantling | Quoted on request |
Standards
- ASME B16.5 — the dimensional standard for pipe flanges up to 24 inch nominal size, covering pressure classes from 150 to 2500.
- EN 1092-1 — the European flange standard, specified by PN rating rather than by class.
- HG 20592 — the Chinese chemical-industry flange standard, frequently called up by Chinese-designed plant projects and recognised internationally.
- Customer drawings — non-standard and bespoke flanges.
ASME classes and EN PN ratings are not directly interchangeable even where the dimensions are close. State which system your pipeline uses, and the facing type as well.
Facings and gasket notes
| Facing | Description | Mating gasket |
|---|---|---|
| Raised face (RF) | A raised ring around the bore; the most common facing | Spiral-wound or sheet gasket to suit the medium |
| Flat face (FF) | Fully flat face; used where the mating flange is cast iron or non-metallic | Full-face gasket |
| Ring type joint (RTJ) | Grooved face for a metal ring; used in high-pressure service | Metal ring joint gasket |
Sizes and pressure classes — inquiry based
The range of sizes and classes that can be produced is wide but depends on the blank availability, the machining involved and the quantity. Rather than publish a matrix that would be out of date and potentially misleading, we confirm the feasible combination against your actual requirement.
From tube to flange: matched orders
Flanges and the pipe they connect are normally needed in the same quantity and the same grade. Ordering them together can mean one document set and one inspection regime, and where the order can be consolidated, one shipment — and it removes the risk of a grade mismatch between the flange and the pipe at the weld.
Titanium tube & pipe
Seamless and welded tube to ASTM B338, B861 and B862.
Tube & pipe →
Titanium forgings
Ring and disc blanks for larger flanges.
Forgings →
OEM & custom supply
Non-standard flanges and mixed packages on one order.
Custom supply →
Gallery
Send the flange standard, size, pressure class and grade and we will confirm availability and price.
WhatsAppSend your specificationRequest a flange quotation
Standard, type, nominal size, pressure class, facing, grade and quantity. If the flange is non-standard, send the drawing instead and we will quote from that.
WhatsApp +86 157 0603 0959 · WhatsApp +86 151 9196 1431 · tockson@163.com