How to Specify a Flange: Purchaser’s Checklist

Define the component

Give flange type, NPS/DN, dimensional standard and edition, class/PN, facing and quantity. For custom pieces attach the drawing and revision; a familiar size label is not a complete geometry.

Define the material

Name the forging specification and exact grade, including class or suffix where relevant. Add heat-treatment condition and approved manufacturer restrictions. State whether substitutions require written approval.

Check every interface

For weld-neck flanges specify bore or matching pipe schedule / actual wall. For RTJ joints specify the ring designation and agreed groove details. Define gaskets, studs, nuts and coatings separately.

Define acceptance and delivery

Agree MTC type, heat-number traceability, PMI/NDT/TPI scope, tolerances and marking. State delivery city / country, required date, packing and Incoterms rule with named place.

Build a complete flange enquiry.

Choose the connection and add your project details. No entry here confirms a pressure rating, material substitution or engineering approval.

8 core fields still need clarification. You can download or share the draft with gaps marked.

Form entries stay in this page until you choose to share or download them; they are not saved automatically. Include gasket, stud, nut and coating specifications separately if required.