Raised face flanges and ring type joint flanges follow different sealing concepts. RF uses a raised gasket seating surface, while RTJ uses a machined groove for a metallic ring gasket. For procurement, that means the same NPS and class can represent very different machining, inspection, gasket, and packing requirements.
Flange engineering / buyers / 7 min
RF vs RTJ Flanges: Raised Face and Ring Type Joint Procurement Guide
RF and RTJ are not cosmetic flange options. Raised face and ring type joint selections change gasket system, machining, inspection, pressure-class review, packing protection, and commercial price. RTI uses this guide to help buyers state flange facing correctly before alloy flanges move into quotation.
Engineering explanation
Written as a specification aid, not a generic article.
The guide keeps standards, material selection, inspection, and commercial release in separate lanes so buyers can issue a cleaner technical RFQ.
RTI should ask for the buyer's piping class or drawing when facing is unclear. Changing RF to RTJ after quotation can affect flange form, stock route, machining lead time, inspection records, and compatibility with mating flanges.
Technical diagram
Facing decision matrix
Step 01
Piping class
Read the project line class or flange schedule first.
Step 02
Pressure class
Confirm class before gasket and groove decisions.
Step 03
Facing
Select RF, RTJ, FF, or special facing as specified.
Step 04
Inspection
Add groove, surface finish, and dimensional checks where needed.
Step 05
Packing
Protect gasket surfaces and grooves through export transit.
Specification table
Structured control points for engineering and procurement.
The table is intentionally compact: it summarizes the decision points RTI needs before a commercial offer becomes technically meaningful.
| Engineering point | Controlled guidance | Procurement implication |
|---|---|---|
| Sealing concept | RF uses a raised gasket seating surface; RTJ uses a machined ring groove. | The buyer must specify the matching gasket/joint system. |
| Inspection focus | RF focuses on face condition and finish; RTJ adds groove geometry and surface protection. | Add dimensional records for RTJ grooves on critical packages. |
| Commercial impact | RTJ often adds machining and inspection complexity. | Do not compare RF and RTJ prices as identical line items. |
| Interchangeability | Mating flange and gasket system must match. | Do not substitute facing without engineering approval. |
| Packing risk | Both face types are vulnerable to mechanical damage. | Specify protectors, separation, and marking for export shipments. |
Application examples
Where this guide changes the buying conversation.
Examples show quotation contexts, not universal approvals. The project specification remains the governing document.
Buyer and procurement implications
The commercial consequences of the engineering detail.
Each point is written for quotation discipline: what to state, what to avoid, and what to hold for engineering or inspection review.
Never omit facing
A flange RFQ without RF, RTJ, FF, or drawing-defined facing is incomplete.
Protect machined surfaces
RTJ grooves and RF gasket faces should be protected from handling and transit damage.
Match the mating flange
Facing selection must match the existing or designed flange pair and gasket system.
Confirm inspection records
RTJ packages often merit groove dimensional records and marking photographs before packing.
Engineering FAQs
Practical questions on RF vs RTJ Flanges.
Answers are intentionally tied to standards, documents, and RFQ data rather than loose sales copy.
Related materials
Continue the material-selection path.
Related links are deliberately narrow so the knowledge centre supports engineering choices instead of spraying pages.
Related products
Move from knowledge to line-item definition.
Product links connect the technical guide to controlled commercial pages and the RFQ intake.
Contextual RFQ
Not sure whether your package is RF or RTJ?
Attach the line class, isometric, or flange schedule and RTI will align facing, class, material, bore, inspection, and packing in the RFQ.
