A quotation that says only “Class 600 RTJ flange” leaves too many costly details unresolved: the flange standard, bore, ring, fasteners, certificates, and protection for the machined groove. By the end, you will have a line-by-line order checklist and a method for confirming that the supplied flange, ring, documents, and packing match your project.
Key takeaways
- State the standard, NPS, class, facing, bore, material, and quantity.
- Confirm the ring number matches the flange groove and pressure class.
- Request material certificates, dimensional reports, and inspection records.
- Compare quotations by inclusions, testing, documents, lead time, and freight.
Start with a complete flange identification line
ASME B16.5 (NPS 1/2–24) or ASME B16.47 (NPS 26–60), Series A or B where applicable; NPS; ASME Class; flange type; RTJ facing R, RX, or BX; pipe outside diameter; wall thickness or schedule; bore; material grade; heat treatment; supplementary testing; quantity.
1. Use this line as the minimum ring type joint flange specifications. “Forged steel” or “Class 600 RTJ” is not enough: an unqualified PN designation does not identify the ASME pressure class. A raised-face order uses a raised face and flat gasket; an RTJ order requires matching grooves and a metallic ring.
A flat gasket cannot replace that ring.
2. State ring type joint flange for order inclusions separately. Identify the applicable ASME B16.20 or API 6A basis, ring number, R-, RX-, or BX-series designation, oval or octagonal cross-section where applicable, material grade, hardness, coating or plating, service temperature, sour-service requirement, and quantity.
Treat the ring as a separate line item unless the quotation expressly includes one ring per flange pair or another stated quantity.
3. If IBR applies, name the Indian Boiler Regulations clause, inspection authority, certificate format, and whether approval covers the flange, its material, or both. IBR status does not replace ASME dimensional requirements for drilling, bore, groove, pressure class, or facing. A flange still needs its specified ASME standard.
Define the ring, fasteners, and included supply lines
An RTJ quotation must identify the ring, not merely say “RTJ” or “Class 600.” The rtj flange supply details should state:
- Basis: ASME B16.20 or API 6A
- Ring number and designation: R, RX, or BX
- Cross-section: oval or octagonal where applicable
- Material grade and hardness
- Coating or plating
- Service-temperature range and sour-service requirement
- Quantity
The ring type joint flange for order inclusions must show whether one ring is supplied for each flange pair, or whether another quantity applies. Treat the ring as a separate line item unless the quotation expressly includes it; never assume it is included. A ring number alone does not prove compatibility.
Do not substitute an R, RX, or BX ring because the nominal size and pressure class look similar; the series, groove, dimensions, and service must match.
Specify fasteners as a separate scope:
- Stud diameter, length, and thread standard
- Stud material grade
- Nut grade
- Washer requirement
- Number of complete sets
- Included or excluded status
State whether bolts, studs, nuts, and washers are supplied together or must be purchased separately. Also record any excluded rings or fasteners on the quotation, so a low flange price does not conceal missing items.
List the documents and inspection records that travel with the order
Write the documentation package into the purchase order, not merely into the supplier’s quotation. Complete RTJ flange supply details include these records:
| Document or record | Purchase-order requirement | What to verify |
|---|---|---|
| EN 10204 3.1 certificate | Link it to the flange heat number | Chemical results, mechanical results, heat treatment, and PMI when specified |
| Dimensional inspection report | Require recorded measured values | Outside diameter, bolt-hole circle, drilling, thickness, bore, facing, groove diameter, groove depth, groove width, concentricity, and surface condition |
| Ring dossier | Identify each ring by number | Material traceability, hardness results, ring-number identification, and coating or plating records |
| Conformity and packing records | Require a certificate of conformity and packing list | Confirm supplied items and quantities |
| Marking schedule | Require the marks to be listed | Match flange, ring, heat, and order identification |
| IBR records | Name the required inspection or acceptance documents | Confirm the applicable IBR deliverable |
Your ring type joint flange specifications should also state whether the package includes hydrostatic testing, ultrasonic examination, magnetic-particle examination, impact testing, or other NDE. Add those records only when the project specification requires them; do not assume a standard quotation includes them.
Make the packing list distinguish flanges, rings, fastener sets, caps, and loose documents. That separation exposes shortages at receipt and prevents a ring or certificate from being mistaken for an included component. Require the supplier to submit the records with the shipment or before release, as the purchase order states.
Confirm that the delivered flange and ring actually fit
1. Reject any flange-ring pair that does not match the approved drawing and purchase order. Confirm nominal size, ASME pressure class, flange standard, bore, facing designation, ring number, and groove diameter, depth, width, and concentricity. These checks are the core of the ring type joint flange specifications and the rtj flange for order inclusions.
2. Check mating orientation before installation: the RTJ grooves must face each other, while the pipe-side bore must suit the pipe outside diameter and wall thickness or schedule. A correct Class 600 flange can still have the wrong bore for the pipe.
3. Inspect the groove under clean light for dents, corrosion, dirt, tool marks, and shipping damage. Groove geometry and surface condition matter as much as bolt-hole dimensions.
Do not fit a flat gasket in an RTJ joint; the wrong R, RX, or BX ring can fail to seat or energise correctly, and a used metallic ring is normally replaced after joint break-out.
4. Treat preservation as part of acceptance. Require protective caps, separated mating faces, corrosion protection, and clear marking of the flange and ring number; ordinary stacking can dent or contaminate the exposed groove. Record any missing protection or mismatched marking before installation, and keep the ring sealed until the joint is ready for assembly.
Use the quotation to compare suppliers in Pune and elsewhere
A low flange price means little if the quotation omits the ring, studs, inspection, or protective packing. Ask every RTJ flange manufacturer to complete the same schedule, marking each line as included, optional, separately priced, or excluded.
| Line item | Supplier A response | Supplier B response |
|---|---|---|
| Flange standard and class | Included: ASME B16.5 or B16.47, class | Included: standard, series and class |
| Size and bore | NPS, bore, schedule or wall thickness | NPS, bore, schedule or wall thickness |
| Material and heat number | Grade, heat traceability | Grade, heat traceability |
| Ring standard and number | ASME B16.20 or API 6A; R, RX or BX number | Standard, ring number and section |
| Ring quantity | State rings per flange pair | State quantity or separate price |
| Fastener scope | Studs, nuts, washers, grades and quantities | Included or excluded, with specifications |
| Certificates | EN 10204 3.1, PMI and other records | Certificate level and charges |
| Inspection points | Groove, bore, dimensions and NDE | Inspection scope and witness points |
| IBR or non-IBR status | State status and required deliverables | State status and required deliverables |
| Delivery packing | Caps, separation, preservation and markings | Packing contents and charges |
| Exclusions | List every omitted item | List every omitted item |
For ring type joint flanges in Pune, including an order with Mahesh Industries, request the approved drawing, groove and bore inspection results, traceable material certificates, and confirmation that the quoted ring matches the supplied flange. Do not accept a catalogue description as proof.
State non-IBR service where it changes documentation, inspection, or price. For IBR scope, name the applicable clause, inspection authority, certificate format, and whether approval covers the flange, material, or both. These RTJ flange supply details turn two quotations into comparable packages.
Frequently asked questions
What should a complete RTJ flange identification line include?
Specify ASME B16.5 or ASME B16.47, NPS, Series A or B where applicable, ASME Class, flange type, RTJ facing R, RX, or BX, pipe outside diameter, wall thickness or schedule, bore, material grade, heat treatment, supplementary testing, and quantity.
Does an RTJ flange supply order include the ring and fasteners?
Confirm both items in writing. State the ring designation, material, quantity, and whether studs, nuts, washers, gaskets, and bolting are included or excluded.
Which documents should travel with an RTJ flange order?
Request the certificate of conformity, material test certificate with heat number and chemical and mechanical results, dimensional inspection report, heat-treatment record, marking details, and reports for supplementary testing such as ultrasonic examination or hardness testing.
How do you confirm that an RTJ flange and ring fit?
Match the flange standard, NPS, pressure class, facing designation, groove dimensions, ring number, material, and bore. Check that the ring seats below the flange face without bottoming out or binding.
How can you compare RTJ flange suppliers in Pune and elsewhere?
Compare identical specifications, included components, inspection documents, testing scope, marking, packaging, delivery terms, lead time, freight, taxes, and replacement terms rather than comparing unit prices alone.
