Product Description
1.Standard Compliance:ANSI/ASME B16.9 butt-welding caps adhere to the specifications outlined by the American National Standards Institute (ANSI) and the American Society of Mechanical Engineers (ASME). This standardization ensures uniformity, compatibility, and reliability in design and performance, facilitating seamless integration into piping systems.
- 2. Butt-Welding Connection:Butt-welding caps are installed by welding them directly onto the end of a pipe, creating a permanent and robust connection. The butt-welding technique involves heating the ends of the pipe and cap to the melting point, then pressing them together to form a metallurgical bond. This welding method provides a strong and leak-proof joint, eliminating the need for additional sealing materials.
- 3. Sealed Closure:The primary function of butt-welding caps is to provide a sealed closure for the end of pipes in a piping system. These caps feature a domed or flat surface that covers the pipe opening, preventing the ingress or egress of fluids or gases. The welded connection ensures a tight seal, minimizing the risk of leaks and maintaining the integrity of the system.
- 4. Material Selection:Butt-welding caps are available in various materials to suit different operating conditions and media. Common materials include carbon steel, stainless steel, alloy steel, and non-ferrous alloys such as brass or copper. The choice of material depends on factors such as temperature, pressure, corrosion resistance, and compatibility with the fluid being transported.
- 5. Versatile Applications:ANSI/ASME B16.9 butt-welding caps find applications across diverse industries, including oil and gas, petrochemical, chemical processing, water treatment, and power generation. They are used for sealing the ends of pipelines, vessels, tanks, and equipment, providing protection against contamination, corrosion, and environmental hazards.
- ANSI/ASME B16.9 butt-welding caps are critical components in industrial piping systems, providing a secure and leak-proof closure for pipe ends. Their compliance with ANSI and ASME standards, butt-welding connection, sealing capabilities, and versatility make them indispensable in various applications across industries. With butt-welding caps, engineers and operators can ensure the integrity, safety, and efficiency of their piping systems, contributing to smooth and trouble-free operations.
Company Profile
ABOUT US
Cangzhou Yulong Steel Co., Ltd. is located in Mengcun Hui Autonomous County, known as the "Capital of Pipe Fittings in China". It is a comprehensive enterprise integrating research and development, production, sales, quality inspection, packaging, and transportation.
The company mainly produces and exports steel pipes, flanges, and pipe fittings, which are widely used in shipbuilding, chemicals, oil, electricity, gas, water supply, and other fields. It has established long-term strategic cooperative relationships with many domestic and foreign companies.
Why Choose MTGrass
As one of the company's core products, steel pipes have a constant inventory of over 500,000 tons. The company produces various types of steel pipes, including seamless steel pipes, spiral steel pipes, and straight-seam steel pipes, to meet the needs of different customers. These products are strictly produced according to industry standards such as API 5L, API 5CT, ANSI, ASME, EN, DIN, GOST, JIS, KS, BS, ensuring that product quality meets customer requirements.
In the field of flanges and pipe fittings, the company relies on a complete supply chain management system and exports to over 50 countries and regions worldwide, including the Middle East, Southeast Asia, Russia, Europe, Mexico, South America, Africa, etc. The products comply with various standards such as EN1092-1/ANSI/ASME/DIN/JIS/KS/BS/GOST, and are made of materials including Q235, A105, S235, 20#, A234WPB 20G, 16Mn, 12Cr1MoV, 15CrMo, 1Cr5Mo, 1Cr9Mo, A335P5/P9/P11/P12/P22/P91/P92, WB36, 10CrMo910, OCr18Ni9, and 1Cr18Ni9Ti.
Cangzhou Yulong Steel Co., Ltd. will continue to adhere to the enterprise philosophy of "people-oriented, quality first", continuously improving the quality and level of products and services. The company will continue to expand its market, optimize its sales network, and provide customers with more high-quality and efficient services.
FAQ
What is a butt welding cap?
A butt welding cap-also known as a buttweld end cap-is a round, factory made fitting welded to the open end of a pipe to provide a seamless, full penetration closure. It matches the pipe's outer diameter and schedule, and may have a hemispherical or flat face to ensure uniform wall thickness and proper fit-up. |
What materials are commonly used?
Butt welding caps are produced in carbon steel (e.g., ASTM A234 WPB), stainless steel (304, 316L), nickel alloys, and other engineered grades to meet varying pressure, temperature, and corrosion-resistance requirements. |
What standards govern butt welding caps?
The primary standard is ASME B16.9, which covers dimensions, tolerances, pressure ratings, marking, and testing for butt-welded fittings from NPS 1/2 through NPS 48 (DN 15-DN 1200). Specialty references include MSS SP-43 for wrought stainless steel fittings and ASME E3044/E3044M-16e1 for ultrasonic testing of polyethylene butt fusion joints. |
How are butt welding caps installed?
Preparation: Clean and bevel the pipe end and cap to form a V-groove per wall-thickness-specific bevel angles and root face dimensions.
Tack Welding: Apply evenly spaced tack welds to secure the cap and prevent movement during welding.
Final Welding: Execute a root pass, then filler and cap passes according to the qualified Welding Procedure Specification (WPS). |
Where are butt welding caps typically used?
They are widely used in oil & gas pipelines, petrochemical plants, power generation, water/wastewater treatment, and other process industries where durable, leak-proof pipe terminations are critical. |
What are the advantages of threaded caps?
Butt welding caps create a continuous, full-thickness joint (joint efficiency ≈ 1), resulting in higher strength and superior leak resistance, whereas threading reduces wall thickness and can loosen under vibration. They also provide a smooth bore that minimizes flow disruption and pressure drop, unlike the turbulence introduced by threaded. |
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