Flanges and Fittings: Matching Pressure Class and Material
A flange is only as good as its match: pressure class, facing, material, gasket and bolting have to agree. Here is how to get it right.
A vague enquiry gets a vague price. Use this checklist to write a request for quotation that suppliers can answer quickly and accurately.

A request for quotation (RFQ) is only as good as the information in it. If a supplier has to guess, the price will include a margin for the guess, or the reply will be a list of questions. Both cost you time.
Item type (for example gate valve, WN flange, 90° elbow).
Size (nominal pipe size) and, where it matters, schedule or wall thickness.
Pressure class (for example 150, 300, 600) or pressure rating.
Material of body and trim, including any special grade or sour-service requirement.
End connections and facing (for example flanged RF, RTJ, butt-weld, threaded).
Design and test standard (for example API 6D, API 600, ASME B16.5, ASME B16.9).
Quantity and unit.
Delivery location and the date you need the material.
AML or vendor list that applies (see our guide to the Approved Manufacturers List).
Documents required: material test certificates, conformity, inspection or witness requirements.
Packaging and marking requirements.
Payment and validity terms you expect.
Attach the datasheet or BOQ instead of retyping it. Fewer typing mistakes.
Number the lines so the quote can refer to them.
Flag alternates. Say whether equivalent items will be considered and who approves them.
Give a deadline for the quote as well as for delivery.
Name one contact for technical questions.
Our quote form walks through these points in three steps and lets you add as many line items as you need. Prefer email? Send your BOQ to info@floamenergy.com.
A flange is only as good as its match: pressure class, facing, material, gasket and bolting have to agree. Here is how to get it right.
Buying from a manufacturer that is not on your client's list can mean rejected materials and delays. Here is what an AML is and how to work with it.
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Tell us what you need. Our team will come back with pricing, availability and lead times.
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