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Seamless Stainless Steel Flat Bottom Buttweld Caps custom

Seamless Stainless Steel Flat Bottom Buttweld Caps Manufacturers

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High-Integrity Seamless End Caps

In piping systems where the flow must be permanently terminated or where future expansion is anticipated, the quality of the end cap is paramount. Our Seamless Stainless Steel Flat Bottom Buttweld Caps are manufactured from high-grade hollow bars or seamless pipes, ensuring a uniform grain structure without the presence of longitudinal welds. As a specialized manufacturer, we focus on the precision of the beveled edge and the flatness of the bottom to ensure a perfect fit with the host pipe. Made from 304L or 316L stainless steel, these caps provide an airtight, leak-proof seal that can withstand the same pressure and temperature ratings as the rest of the piping system. The seamless construction eliminates potential weak points, making these caps the preferred choice for safety-critical applications in hazardous gas and high-purity liquid transportation.

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End Cap Specification Details

ParameterSeamless Cap Specification
Material OptionsASTM A403 WP316L, WP304L, 904L
Size Range1/2" to 24" (DN15 - DN600)
Standard ComplianceASME B16.9, DIN 2617, EN 10253
End ConfigurationButt Weld Beveled Ends (37.5°±2.5°)
Wall ThicknessSch 10S, Sch 40S, Sch 80S, Sch 160
Surface TreatmentPickled, Passivated, Mirror Polish (Optional)

Versatile Termination Applications

These seamless flat-bottom caps are widely utilized in the pharmaceutical and food processing industries where "dead-legs" must be minimized and surfaces must remain hygienic. In the chemical industry, they are used to seal off process headers and manifold branches. Because they are seamless, they are the standard for high-purity gas delivery systems in the semiconductor industry, where weld seams could entrap particulates. They are also used in vacuum systems and cryogenic storage tanks due to their excellent leak-tightness. In oil and gas pipelines, these caps are installed as temporary seals during construction or as permanent closures for redundant lines. Their flat-bottom design allows for easier integration into equipment casings or when a compact termination is required within a confined skid or cabinet.

Performance & Safety Advantages

  • Zero Weld Weakness: Seamless construction ensures there is no Heat Affected Zone (HAZ) along the body, maximizing structural reliability.
  • Hygienic Internal Surface: The absence of internal weld beads prevents the accumulation of bacteria or chemical residue, ideal for CIP systems.
  • High Precision Bevels: Machine-beveled ends allow for faster field welding and better penetration, reducing installation time.
  • Uniform Stress Distribution: The seamless geometry ensures that internal pressure is evenly distributed across the entire surface of the cap.

Commercial & Logistics Information

We support payments via T/T, PayPal (for sampling), and Irrevocable L/C. For standard sizes, we maintain a large stock of 304L and 316L caps to support immediate project needs. Each cap is individually capped with a plastic protector and packed in high-density cartons or plywood cases for bulk orders. We provide worldwide express shipping via DHL or FedEx for urgent repairs, and containerized sea-freight for large infrastructure projects. Documentation provided includes 3.1 Mill Test Certificates and dimensional inspection reports. Our quality assurance team performs PMI (Positive Material Identification) on every batch to ensure the metallurgy matches your exact project requirements.

  • Q: What is the difference between a flat bottom cap and an ellipsoidal cap?
  • A: Ellipsoidal caps are typically used for high-pressure vessels to better distribute stress, while flat bottom caps are often used for piping terminations or where space is constrained.
  • Q: Can these caps be polished for sanitary use?
  • A: Yes, we offer internal and external mirror polishing (Ra < 0.4μm) for applications in the food, beverage, and pharmaceutical sectors.
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Jiangyin Gaoxin Pipe Fittings Co., Ltd.
About Us
JIANGYIN GAOXIN PIPE FITTINGS CO.,LTD.
Our company is a professional manufacturer of pressure piping components. As Seamless Stainless Steel Flat Bottom Buttweld Caps Manufacturers，Our product range covers butt-weld, socket-weld, and threaded pipe fittings, including flanges and customized non-standard parts. These products are widely used in industries such as oil & gas, chemical processing, power generation, shipbuilding, papermaking, metallurgy, pharmaceuticals, and food processing. We manufacture according to standards such as ASME, EN,JIS,DIN,ANSI,GOST, MSS, GB/T,HG, DL, SH, SY,and have a complete range of inspection equipment, a strict quality control system, and various certifications（PED,AD2000,EAC, ABS,BV, DNV,NORSOK M650, ISO9001,ISO14001,ISO45001,etc.）, making us a leader in the industry.

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