Clear specifications.
Consistent requirements.
Define dimensional, material and acceptance requirements as parts of one fitting specification. Explore the reference areas below before preparing your enquiry.
Build the specification in three parts
Each area answers a different question about the required fitting.
Dimensional Standards
Define the geometry, end sizes and reference dimensions.
Explore requirements →MATERIALSMaterial Standards
Identify the grade, product form and supply requirements.
Explore requirements →ACCEPTANCETolerances & Inspection
Confirm permitted variation and how dimensions are checked.
Explore requirements →Name the document and its edition
A standard designation alone may leave important details unresolved.
- Standard & edition
State the designation and year or edition required by the project.
- Applicable product
Confirm that the fitting geometry and material fall within the selected standard’s scope.
- Project supplements
Include approved drawings and any supplementary specification requirements.
- Acceptance criteria
Identify tests, inspections and dimensional tolerances required for acceptance.
Access the publisher’s scope
These commonly referenced documents cover different aspects of butt weld fitting requirements.
ASME B16.9
Factory-made wrought butt-welding fittings: overall dimensions, tolerances and associated requirements.
External link to be added laterASME B16.25
Butt-welding end preparation, including bevel and end-shaping requirements.
External link to be added laterMSS SP-43
Butt-welding fittings for low-pressure corrosion-resistant service; confirm the scope for the specific fitting.
External link to be added laterExternal publisher links will be added after review. Full standards may require purchase. Use the edition specified by your project.
Before you select a standard
Does one standard define the whole fitting?
Not necessarily. Dimensional, material, end-preparation and project acceptance requirements may come from separate documents. Identify all applicable references.
Should I always use the latest edition?
Use the edition required by the project, purchase specification or applicable governing documents. Resolve any conflict before ordering.
Where are the size charts?
This section currently provides specification guidance and publisher references. Detailed numerical charts are being prepared separately.
Can a drawing replace a standard?
A drawing may define special geometry, but material, manufacturing, inspection and acceptance requirements still need to be agreed explicitly.
Ready to define your fitting specification?
Include the standards, editions and project documents with your enquiry.
Prepare your enquiry →