Lap Joint Stub End — Technical Data Sheet

Specification

Materials

Typical applications

• Stainless and alloy lines with carbon steel backing flanges
• Lines dismantled frequently for cleaning

Manufacturing

• Forming: hot or cold flaring of seamless pipe, or machining from forged or rolled rings; lap face machined with a serrated finish.
• Heat treatment: normalising or stress relieving for carbon steel, normalising and tempering for alloy steel, solution annealing for stainless steel.
• Finishing: shot blasting or pickling and passivation, end bevelling to ASME B16.25, and coating with rust preventive (carbon and alloy steel).

Inspection and testing

• Chemical analysis and mechanical tests per heat and heat-treatment lot.
• 100% visual and dimensional inspection against ASME B16.9 tolerances.
• Radiography of weld seams on welded fittings when specified.
• Dye-penetrant or magnetic-particle examination of bevel ends and formed surfaces when specified.
• PMI on stainless and alloy steel; hardness and impact tests when specified.

Marking

Marked to ASME B16.9 / MSS SP-25 by stamping or stencil: manufacturer's mark, size, schedule or wall thickness, material grade and heat number.

Documentation

Mill test certificate to EN 10204 3.1 (3.2 with third-party inspection on request), dimensional inspection report, heat-treatment record where applicable, and NDT reports as specified. IBR certification on request.

Packing

Rust-preventive coating on machined surfaces, plastic end / face protectors, and seaworthy wooden cases or pallets marked with PO line, size, heat number and quantity.

Ordering information

Please state the following on your enquiry:

• Fitting type and angle or pattern
• Nominal size (both sizes for reducing fittings)
• Wall thickness or pipe schedule
• Material specification and grade
• Seamless or welded construction
• Supplementary requirements: NDT, NACE, IBR, third-party inspection
• Quantity and delivery point

Reference information compiled from the published standard for convenience. It does not replace the current edition of the governing standard, which takes precedence. Verify critical dimensions and properties before design, purchase or fabrication. Teshi Engineers & Sales Promoters (P) Ltd accepts no liability for errors or omissions.

Dimensions