Product Description
JIS B2311 is a Japanese Industrial Standard that covers butt-welding pipe fittings, including caps used in piping systems. Butt-welding caps serve the purpose of closing the end of a pipe, providing a seal to prevent leakage or contamination. Here is an introduction to JIS B2311 butt-welding caps:
- 1. JIS B2311 Standard:
- - JIS B2311 standard specifies the requirements for the design, dimensions, materials, manufacturing, and testing of butt-welding fittings, including caps, in piping systems.
- - The standard ensures that caps produced in compliance with JIS standards meet quality standards and are compatible with other piping components.
- 2. Butt-Welding Cap:
- - A butt-welding cap, according to JIS B2311, is a fitting designed to cover and seal the end of a pipe securely, offering protection and maintaining the integrity of the piping system.
- - Caps are used in situations where the pipe end requires closure, either permanently or temporarily, to prevent leakage, contamination, or to provide a finish to the system.
- 3. Material and Construction:
- - Butt-welding caps under JIS B2311 specifications are available in various materials such as carbon steel, stainless steel, and alloy steel to meet different application requirements.
- - These caps are manufactured using standardized construction methods to ensure a strong and leak-free connection when welded to the end of a pipe.
- 4. Application and Benefits:
- - Butt-welding caps find applications in various industries, including oil and gas, chemical processes, water treatment plants, and more where pipe endings need to be capped securely.
- - Caps provide protection to pipe ends from environmental elements, prevent contamination, and help maintain the cleanliness and integrity of the piping system.
- 5. Installation and Welding:
- - Proper installation practices, including correct alignment, preparation of the pipe end, and welding techniques, are essential when installing butt-welding caps to ensure a tight and leak-proof seal.
- - Welding is a common method for attaching caps to pipes, providing a secure and permanent closure that can withstand pressure, temperature variations, and fluid flow within the system.
- In summary, JIS B2311 butt-welding caps are crucial components used in piping systems to seal and protect the end of pipes securely. These caps conform to standardized requirements to ensure quality, reliability, and compatibility within industrial applications where pipe closure and protection are necessary.
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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