ASME B16.9 Stub Ends are essential buttweld fittings used in conjunction with lap joint flanges to provide flexibility, ease of alignment, and simplified dismantling of piping systems. These fittings are widely used in oil & gas, petrochemical, refinery, power generation, offshore, and chemical processing industries where frequent maintenance or corrosion-resistant piping is required.
Creative Piping Solutions Private Limited manufactures and exports high-quality ASME B16.9 Stub Ends that comply with international dimensional, material, and testing requirements, ensuring long-term performance in critical service applications.
What Is a Buttweld Stub End?
A stub end is a short pipe section with one buttweld end and one lap face end. The buttweld end is welded to the pipe, while a lap joint flange freely rotates over the stub end. This design allows easy bolt alignment without rotating the pipe itself, making stub ends ideal for systems requiring frequent inspection or dismantling.
ASME B16.9 Standard Overview
ASME B16.9 is the governing standard for factory-made wrought buttwelding fittings, including stub ends. This standard ensures dimensional accuracy, pressure integrity, and interchangeability with other ASME piping components.
Scope of ASME B16.9
- Covers short and long pattern stub ends
- Defines dimensional tolerances and facing details
- Ensures compatibility with ASME B16.5 Lap Joint Flanges
- Applicable to carbon steel, alloy steel, stainless steel, and special alloys
Types of ASME B16.9 Stub Ends
Short Pattern Stub End
- Most commonly used configuration
- Economical and compact design
- Preferred where space constraints exist
Long Pattern Stub End
- Length similar to a welding neck flange
- Provides better alignment in critical piping systems
- Used when specified by engineering design
Manufacturing Process at Creative Piping Solutions
Our ASME B16.9 Stub Ends are manufactured using forged or seamless pipe forming methods, followed by precision machining and controlled heat treatment to achieve required mechanical properties.
- Raw material inspection
- Hot forming or forging
- Heat treatment (normalizing or solution annealing)
- CNC machining of lap face
- Beveling as per ASME B16.25
- Final dimensional and visual inspection
Material Grades for ASME B16.9 Stub Ends
Carbon Steel
- ASTM A234 WPB
- ASTM A234 WPC
- ASTM A105
- ASTM AISI 4140 / UNS G41400
Alloy Steel
- ASTM A234 WP1, WP5, WP9
- ASTM A234 WP11, WP22, WP91
Stainless Steel
- ASTM A403 WP304 / 304L
- ASTM A403 WP316 / 316L
- ASTM A403 WP321 / WP347
Duplex & Super Duplex
- UNS S31803 / S32205
- UNS S32750 / S32760
Nickel & Special Alloys
- Inconel, Incoloy
- Monel, Hastelloy
- Alloy 20
- Titanium
- Copper Nickel
- Aluminium Bronze
Dimensional Specifications
- Size Range: NPS ½” to 48”
- Schedules: SCH 10, SCH 20, SCH 40, SCH 80, SCH 160, XXS
- Custom wall thickness available as per project requirements
End Preparation
- Bevel as per ASME B16.25
- Standard bevel angle: 37.5° ± 2.5°
- Root face and land maintained as per code
Surface Finish and Facing
The lap face is precision-machined to ensure proper seating with ASME B16.5 Lap Joint Flanges. Smooth concentric finishes help achieve reliable sealing and long service life.
Product Marking Details
Each ASME B16.9 Stub End is permanently marked with the following details:
- Nominal size and schedule
- Type: Short or Long Stub End
- Standard: ASME B16.9
- Material grade
- Heat number
- Manufacturer identification
- Country of origin
Example:
8” × SCH 40 Short Stub End
ASME B16.9
ASTM AISI 4140 / UNS G41400
Made in India
Testing and Quality Assurance
- EN 10204 3.1 Mill Test Certificate
- Chemical and mechanical testing
- Dimensional inspection
- Visual inspection
- PMI testing (on request)
- NDT: UT, RT, MT, PT as required
Applications of ASME B16.9 Stub Ends
- Oil and gas pipelines
- Refineries and petrochemical plants
- Offshore platforms
- Power generation units
- Chemical and process industries
- LNG and gas transmission systems
Export Reference – Saudi Arabia Oil & Gas Industry
Creative Piping Solutions Private Limited has successfully manufactured and exported ASME B16.9 Short Pattern Stub Ends for oil and gas projects in Saudi Arabia. These stub ends were supplied in high-strength alloy steel grades, meeting stringent inspection, documentation, and international project requirements.
Our products are widely accepted by EPC contractors and end users across the Middle East for critical hydrocarbon service applications.
Why Choose Creative Piping Solutions Private Limited?
- ISO-certified manufacturing facility
- Strict compliance with ASME standards
- Wide range of materials and sizes
- Proven export experience
- Precision machining and finishing
- Reliable delivery schedules
We export our high-quality ASME B16.9 Stub Ends various countries around the world, including:
Saudi Arabia, Bahrain, Singapore, Oman, United States, Kuwait, Australia, Peru, Philippines, United Kingdom, Argentina, Algeria, Bulgaria, Cameroon, Canada, Chile, Czech Republic, Djibouti, Dominican Republic, Ecuador, Germany, Ghana, Greece, Guatemala, Israel, Jordan, Mexico, Morocco, Myanmar, Panama, Poland, Qatar, Romania, Bolivia, Brazil, Netherlands, Malaysia, Mauritania, Slovenia, South Korea, Spain, Sri Lanka, Taiwan, Thailand, Tunisia, United Arab Emirates, Venezuela, Vietnam, Mauritius, Monaco, Russia.
Conclusion
ASME B16.9 Stub Ends are vital components for flexible and maintainable piping systems. With certified materials, precise dimensions, and rigorous quality control, Creative Piping Solutions Private Limited delivers stub ends that meet the highest international standards for oil & gas and industrial piping applications worldwide.
Reference: ASME B16
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