Applicable Standards

ASME B16.9

Applicable to factory-made wrought buttwelding fittings and applicable stub-end configurations.

ASME B16.25

Butt-welding end preparation.

ASME B16.5

Applicable to the mating lap joint flange dimensions and pressure class where applicable.

ASME B16.47

Applicable to associated large-diameter flange arrangements where required.

ASTM / ASME Material Specifications

Applicable material standards according to the selected material and grade.

ASME B31.3 / B31.1

Process and power piping requirements, where applicable.

NACE MR0175 / ISO 15156

For sour-service applications when specifically required by the project.

Note: Stub ends should be specified according to their applicable configuration, material, dimensions and mating flange arrangement. ASME B16.28 should not be presented as the primary current standard.

Materials

Carbon Steel

ASTM A234 WPB, WPC and applicable WPHY grades including WPHY 42, WPHY 46, WPHY 52, WPHY 60, WPHY 65 and WPHY 70.

Low Temperature Carbon Steel

ASTM A420 WPL3, WPL6 and other applicable grades.

Stainless Steel

ASTM A403 WP304/304L, WP316/316L, WP321/321H, WP347/347H and other applicable grades.

Duplex & Super Duplex

ASTM A815 grades including UNS S31803, S32205, S32750 and S32760.

Alloy Steel

ASTM A234 WP1, WP5, WP9, WP11, WP12, WP22 and WP91.

Nickel Alloys

ASTM B366 and applicable specifications for Nickel 200/201, Monel 400/K500, Inconel 600/601/625/800/825, Hastelloy C276 and Alloy 20.

Copper-Nickel Alloys

Applicable Cu-Ni grades including UNS C70600 and C71500.

Titanium

Applicable titanium grades manufactured to the relevant ASTM specification, including ASTM B363 where applicable.

Material selection is based on operating pressure, temperature, process fluid, corrosion conditions, mechanical requirements and applicable project specifications.

Short Stub End Configurations

Short Pattern Stub End

Compact hub configuration designed for use with a loose lap joint flange.

Lap Joint Stub End

Used with a rotating lap joint flange to facilitate bolt-hole alignment and equipment/piping assembly.

Seamless Stub End

Seamless construction for applicable sizes, materials and wall thicknesses.

Welded Stub End

Welded construction for selected sizes and materials where permitted by the applicable specification.

Fabricated Stub End

Custom-fabricated construction for large diameters, heavy wall thicknesses and special project requirements.

Design Features

• Short-pattern hub configuration
• Butt-welding connection to the pipe
• Designed for use with lap joint flanges
• Allows rotation of the backing flange for bolt alignment
• Compact and economical design
• Stub-end and flange materials can be selected separately where permitted
• Suitable for systems requiring frequent assembly or disassembly
• Controlled wall thickness and dimensional tolerances
• Beveled welding ends according to ASME B16.25 where applicable
• PMI and NDE available for critical services
• Custom dimensions available

Dimensions & Wall Thickness

Stub End dimensions depend on the stub-end configuration, pipe size, wall thickness, flange arrangement and applicable project requirements.

Available wall thicknesses include:

SCH 5S, 10S, 20, 40S, STD, 80S, XS, 100, 120, 140, 160 and XXS, together with project-specific wall thicknesses.

Key ordering dimensions can include:

• Nominal Pipe Size
• Outside Diameter
• Inside Diameter
• Wall Thickness
• Hub Length
• Overall Length
• Lap / flange engagement dimensions
• Butt-weld end preparation

For non-standard Short Stub Ends, dimensions can be manufactured according to approved engineering drawings.