Applicable Standards

ASME B16.9
Factory-made wrought buttwelding fittings, including standard long-radius elbows and 180° return elbows.

ASME B16.25
Butt-welding end preparation.

ASTM / ASME Material Specifications
Applicable material standards based on 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.

ASME Section II
Material requirements where applicable to pressure equipment and project specifications.

Note: ASME B16.28 should not be presented as the primary current standard for these products. Standard 180° return elbows are covered by ASME B16.9.

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.

Long Radius Elbow Types

45° Long Radius Elbows

Designed for gradual 45° changes in piping direction where smooth flow transition is required.

90° Long Radius Elbows

The most common LR configuration for changing piping direction by 90°, widely used in process, utility and industrial piping systems.

180° Long Radius Return Elbows

Used to reverse flow direction by 180°. Commonly used in heat exchangers, boilers, heater coils and compact process piping arrangements.

3D Long Radius Elbows

Extended-radius elbows with approximately 3D centerline radius, generally manufactured according to project requirements.

5D Long Radius Elbows

Large-radius elbows with approximately 5D centerline radius for specialized piping applications requiring a gradual flow transition.

Fabricated Long Radius Elbows

Custom-fabricated elbows for large diameters, special wall thicknesses, unusual radii and engineered piping systems.

Design Features

• Standard 1.5D long-radius configuration
• 45°, 90° and 180° return configurations
• Seamless, welded and fabricated construction
• Butt-welding ends for permanent piping connections
• Accurate center-to-end dimensions
• Controlled wall thickness and dimensional tolerances
• Beveled ends according to ASME B16.25 where applicable
• Wide range of material and grade options
• Special 3D, 5D and custom radii
• PMI and NDE available for critical services
• Custom dimensions and configurations available

Dimensions & Wall Thickness

Standard dimensions are manufactured in accordance with ASME B16.9, where applicable.

Available wall thicknesses include:

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

For 180° return elbows, principal dimensions include Center-to-Center (O) and Back-to-Face (K) dimensions.

For non-standard 3D, 5D or custom-radius elbows, dimensions are established according to the approved engineering drawing or project specification.