ASME B16.9 | Lap Joint Stub Ends | Butt-Welding Pipe Fittings | Long & Short Pattern | Carbon Steel, Stainless Steel, Duplex, Alloy & Nickel Alloys
Elite Lap Joint Stub Ends are butt-welding components designed for use with loose Lap Joint Flanges. The stub end is welded to the pipe while the backing flange remains free to rotate, allowing easier bolt-hole alignment and convenient assembly, inspection and maintenance.
Lap Joint Stub Ends are particularly suitable for piping systems where frequent dismantling or access to the piping connection is required. They are available in long and short pattern configurations and in a wide range of materials for process, oil & gas, petrochemical, power and industrial piping applications.
| Parameter | Specification |
|---|---|
| Manufacturer | Elite |
| Product | Lap Joint Stub End |
| Primary Standard | ASME B16.9 |
| Configuration | Long Pattern / Short Pattern |
| Size Range | NPS 1/2"–24" standard; larger sizes project specified |
| Construction | Seamless / Welded / Fabricated |
| Connection | Butt Weld |
| Flange Compatibility | Lap Joint Flange |
| Wall Thickness | Schedule / pipe wall thickness as specified |
| End Preparation | ASME B16.25 where applicable |
| Flange Standard | ASME B16.5 / B16.47 where applicable |
| Heat Treatment | Material and specification dependent |
| Surface Finish | Machined / Pickled / Blasted / Polished / Project Specified |
| Inspection | Visual, dimensional, PMI and NDE as specified |
| Documentation | MTC, EN 10204 3.1/3.2 and project documentation |
Note: ASME B16.9 is the primary dimensional standard for the stub end. The mating Lap Joint Flange is specified separately according to its applicable flange standard, size, pressure class and facing.
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.
Material selection is based on pressure, temperature, process fluid, corrosion conditions, mechanical requirements and project specifications.
Long Pattern
Extended stub-end configuration for applications requiring additional stub length.
Short Pattern
Compact configuration where reduced overall length is preferred.
Seamless
Seamless construction for applicable sizes, materials and wall thicknesses.
Welded
Welded construction for applicable materials and sizes.
Fabricated
Custom fabrication for large diameters, heavy-wall requirements and special applications.
Elite Lap Joint Stub Ends are manufactured using appropriate forming, machining, welding and fabrication processes according to material, size and project requirements.
Quality control may include:
Elite can manufacture Lap Joint Stub Ends according to customer drawings and project specifications, including:
Available documentation can include:
Elite Lap Joint Stub Ends are used in:
They are especially suitable for piping systems requiring frequent dismantling, inspection, cleaning or flange alignment.
When ordering Lap Joint Stub Ends, please specify:
| Item | Required Information |
| Product | Lap Joint Stub End |
| Size | NPS |
| Pattern | Long / Short |
| Material & Grade | ASTM / ASME grade |
| Wall Thickness | Schedule or actual thickness |
| Construction | Seamless / Welded / Fabricated |
| Standard | ASME B16.9 / Project Specification |
| End Preparation | ASME B16.25 or project specified |
| Mating Flange | Lap Joint Flange size / class / facing |
| Surface Finish | Standard / Pickled / Blasted / Polished |
| Inspection | PMI / UT / RT / MT / PT / Hardness as required |
| Documentation | EN 10204 3.1 / 3.2 and project documents |
| Special Requirements | Drawing, coating, NACE, testing or other project requirements |
Typical Order Example:
6″ Short Pattern Lap Joint Stub End, ASME B16.9, ASTM A403 WP316L, SCH 40S, Seamless, ASME B16.25 Bevel End, for 6″ Class 150 Lap Joint Flange, EN 10204 3.1, PMI.
