Applicable Standards

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

ASME B16.25
Butt-welding end preparation.

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.

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. Relevant wrought buttwelding fitting dimensions are incorporated into the current ASME B16.9 framework.

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 Radius Elbow Types

90° Short Radius Elbow

The primary standard SR configuration, generally using a 1D centerline radius. Used where a compact 90° directional change is required.

45° Short Radius Elbow

Used for a 45° directional change where a compact configuration is required. Availability and dimensions depend on the applicable standard and size.

180° Short Radius Return Elbow

Used for 180° flow reversal in compact piping arrangements, including selected heat exchanger, boiler and process applications.

Seamless Short Radius Elbows

Manufactured from seamless pipe or tube for applicable sizes, materials and wall thicknesses.

Welded Short Radius Elbows

Suitable for selected larger sizes and materials where welded construction is permitted by the project specification.

Fabricated Short Radius Elbows

Custom-manufactured for large diameters, special wall thicknesses and non-standard configurations.

Design Features

• Compact short-radius geometry
• Standard 1D radius for applicable 90° elbows
• 45°, 90° and 180° configurations
• Butt-welding ends for permanent piping connections
• Seamless, welded and fabricated construction
• Accurate dimensional control
• Controlled wall thickness and ovality
• Beveled ends according to ASME B16.25 where applicable
• Wide range of material and grade options
• 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 standard 90° short-radius elbows, the centerline radius is typically 1D. For 180° return elbows and other configurations, dimensional requirements depend on the applicable ASME B16.9 dimensional tables and project specification.

For non-standard configurations, dimensions can be manufactured according to approved engineering drawings.