Standards guide
Pipe Schedule vs Wall Thickness
How to avoid confusion between nominal pipe size, schedule, and real wall thickness.
Practical Standard Review
Pipe RFQs should state NPS or OD, schedule or exact wall thickness, length, end finish, standard, grade, tolerance, and coating. Schedule names can vary by size and standard.
Himount Steel reviews the ordered standard, grade, product form, dimension tolerance, inspection level, packing method, and shipment route before confirming price and lead time. Final supply always follows the buyer specification and accepted mill test certificate.
Key Ordering Points
| Main comparison | Pipe RFQs should state NPS or OD, schedule or exact wall thickness, length, end finish, standard, grade, tolerance, and coating. Schedule names can vary by size and standard. |
|---|---|
| Confirm in RFQ | NPS or OD, schedule, actual wall thickness, standard, grade, length, and end finish |
| Risk to avoid | Do not quote only Schedule 40 without confirming nominal size and standard. |
| Documentation | Confirm MTC type, heat number traceability, inspection record, and any buyer approval wording. |
| Next step | Send the project specification or previous PO so Himount Steel can check the supply route. |
Buyer Checks Before Quotation
- Use the project specification as the authority when grade names look similar.
- Confirm product form, size, tolerance, delivery condition, and inspection plan together.
- Ask for comparable references only as RFQ aids, not automatic substitutions.
- Review certificate wording before shipment if the project has strict acceptance rules.
Related Himount Pages
Prepare A Complete Steel Inquiry
Send the product standard, grade, size list, quantity, drawings, inspection scope, certificate request, packing method, and destination port. Himount Steel will review the technical route before quotation.