Confirm flange type, standard and drawing basis
RFQ Checklist for Forged Flanges and Forged Parts
A complete forged flange RFQ should clearly state the standard, material, size, pressure rating, facing, quantity, inspection process and destination. Use this checklist to prepare the first message clearly so quotation review can start without repeated clarification. A separate table covers rings, cylinders, tube sheets, valve forgings and custom parts, which are controlled by a drawing rather than a flange standard.
Key Points
List size, pressure rating, material and quantity
Attach inspection and certificate requirements early
Include destination country and packing expectations
RFQ Data Fields That Prevent Re-Quotation
| RFQ field | Minimum usable data | Example | Why it matters |
|---|---|---|---|
| Standard | ASME, EN, DIN, GOST or drawing number | ASME B16.5 | Sets dimensional table and inspection basis |
| Size | NPS or DN plus bore or schedule | NPS 6, Sch 80 bore | Prevents bore and wall-thickness mismatch |
| Pressure rating | Class or PN | Class 600 or PN 40 | Controls thickness, drilling and face requirements |
| Material | Exact grade and condition | ASTM A105N or A350 LF2 | Controls MTC, heat treatment and test route |
| Facing | RF, FF, RTJ or drawing face | RTJ R46 groove | Changes machining and inspection scope |
| Documents | MTC, NDT and third-party inspection | MTC 3.1 + PMI + UT | Prevents late document cost additions |
For non-flange forgings: rings, cylinders, tube sheets, valve forgings and custom parts
Standard flanges can often be reviewed from ASME, EN, DIN or GOST wording, but rings, bowls, cylinders, tube sheets and valve forgings usually need drawings, because the machining allowance, datum faces, NDT zones and final use control the manufacturing route. Quotation risk appears when an RFQ mixes finished dimensions with raw forging dimensions, so say which one the drawing shows.
| RFQ field | What to send | Why it matters before quotation |
|---|---|---|
| Part identity | Product family, standard name or drawing number with revision | Separates standard flange review from drawing-controlled forging review. |
| Dimensions | Finished drawing plus forging allowance, with a note on which one the drawing shows | Controls forging size, machining route, tolerances and material yield. |
| Material condition | Grade, normalizing or quench-and-temper condition, impact temperature if required | Changes raw material route, heat treatment time and certificate review. |
| Machining scope | As-forged, rough machined, final machined, sealing face, bore, drilling or datum faces | Prevents misunderstanding between forged blank supply and ready-to-install component supply. |
| Inspection scope | MTC 3.1, UT, MT, PT, PMI, dimensional report, hardness or third-party inspection | Inspection can change lead time, cost and whether a first offer is comparable. |
Practical Checklist
- Flange type: weld neck, slip-on, blind, socket weld, threaded, lap joint or custom drawing
- Standard or drawing: ASME B16.5, EN, DIN, GOST or project-specific drawing
- Size: NPS or DN, plus bore if the drawing is not standard
- Pressure rating: Class, PN or project pressure requirement
- Material grade and condition, such as ASTM A105, A105N or A350 LF2
- Facing and connection details: RF, RTJ, FF, bore, bolt pattern and tolerance notes
- Quantity, required delivery destination and needed-by date
- Inspection documents: MTC 3.1, dimensional report, PMI, UT, MT, PT or third-party inspection
Common RFQ Mistakes
- Sending only a product name without standard, size or pressure rating
- Mixing DN, NPS, PN and Class references without a drawing or specification
- Leaving facing, bore or bolt pattern unclear for non-standard requirements
- Requesting certificate or inspection documents only after price discussion
- Omitting destination country, packing requirement or third-party inspection need
FAQ
What information must a forged flange RFQ include for an accurate quote?
State the standard (ASME B16.5, EN 1092-1, DIN or GOST), flange type, NPS or DN, pressure class or PN, facing (RF, RTJ or FF), material grade, bore or schedule, quantity, inspection documents and destination country. Missing any of these usually causes re-quotation.
Why does the destination country matter in a flange RFQ?
Destination drives packing standard, document language, certificate requirements and freight terms. A quotation without the destination can miss export packing, marking or documentation costs.
Should inspection requirements be sent before or after the price?
Before. MTC 3.1, PMI, UT, MT/PT or third-party inspection each add measurable cost and lead time. Prices compared without the same inspection scope are not comparable.
Can one RFQ mix several flange standards and sizes?
Yes. Send a line-item table with one row per standard, type, size, class, material and quantity. Clear line items are quoted faster than mixed free-text descriptions.
Can this checklist be used for rings, cylinders, tube sheets or valve forgings?
Yes. Rings, cylinders, tube sheets, valve forgings and custom parts are controlled by a drawing rather than a flange standard, so use the forged-parts table for the drawing revision, finished dimensions and forging allowance, machining scope and inspection scope, then the practical checklist for quantity, destination and documents.
Send your RFQ or drawing directly to BLD Forge Direct.
Email quote@bldforgedirect.com with standard, drawing, material, quantity and inspection requirements.