Zhejiang Daye Flange Co., Ltd. is one of the leading manufacturers and suppliers of ss flange lapping stub end in China. With abundant experience, we are committed to providing high quality flanges made in China with competitive price. We warmly welcome you to buy durable ss flange lapping stub end in stock here from our factory. Also, quotation is available.
SS Flange Lapping Stub End are purpose-built butt-weld fittings for piping systems, and must be used with matching lap joint flanges (also called loose flanges or backing flanges). Each stub end is a short pipe section with an outward-flared rim on one side. The straight pipe end connects to the pipeline via butt welding, while the flat flared face acts as the sealing surface. The backing flange slips over the outside of the stub end; when bolts are tightened, it compresses the flared face to create a detachable, leak-tight pipe joint. The flange itself never comes into contact with the conveyed medium, and only provides clamping force and structural support.
SS Flange Lapping Stub End serve core practical functions: they enable detachable pipe connections, provide a stable sealing reference face, isolate conveyed process media from the backing flange, and help mitigate thermal stress in piping systems.
Parameters
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Standard: |
ASME B16.9,MSS SP-43, EN 1092-1 / DIN 2605,JIS B2220 |
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Size: |
Seamless:1/2"-24" Welded:1/2"-48" |
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Thickness: |
SCH5S-XXS |
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Grade: |
Stainless steel: 304/304L, 316/316L, 321, 316Ti, 347/347H, 310S Super stainless steel: 254SMO/F44, 904L Duplex steel: F51/2205, F53/2507 Special alloy steel:Inconel(625,600,718,750,601), Hastelloy(276,C-22,C-4,C,X,B-2), Monel(400,500), Incoloy(800, 825, 020, 028, 925), etc |
Product Advantage
- Significant cost savings
- Flexible and efficient installation
- Reduced welding stress
Applications
Pipelines conveying corrosive media
Sanitary-grade stainless steel process piping
System pipelines requiring routine inspection and maintenance
Test
Mill certificate,100%PMI,Tensile Test,Hardness Test,Impact Test,IC Test,etc.it depends on the requirements.
Cerfitications
PED
PED
ISO 45001
ISO 9001
ISO 14001
Packaging
Outer Packaging:
Fumigated wooden crates/Fumigation-free plywood crates/Customized wooden crates
Inner Packaging:
Plastic flange protectors/Bubble wrap/Cardboard/Protective paper
Packaging can be customized to meet your specific requirements.
FAQ
Q: Can SS Flange Lapping Stub End be used with standard flanges?
A: No - they must be paired with dedicated lap joint flanges. Standard flanges have a mismatched sealing face geometry and cannot form a tight seal against the stub end flare. Lap joint flanges feature a rounded inner transition that fits perfectly with the flare's radius, ensuring even load distribution and reliable sealing.
Q: How to choose between long-pattern and short-pattern lap joint stub ends?
A: Long-pattern (standard) stub ends are the universal choice for most low-to-medium pressure services, and provide ample space for welding operations. Short-pattern stub ends have a reduced length, designed primarily for Class 300+ high-pressure applications, pipelines with extremely tight space constraints, and thin-walled stainless steel light-duty systems.
Q: Are there mandatory requirements for flare thickness?
A: Industry standards specify that the minimum flare thickness must not be less than the pipe's nominal wall thickness to ensure pressure-bearing capacity. For high-pressure service, the flare requires additional thickening to prevent plastic deformation under bolt compression, which would cause seal failure.
Q: What are the common causes of cracking in stainless steel flares?
A: Key causes include excessively thin pipe walls, reduced ductility from excessive material work hardening, undersized forming die radii or overly fast processing speeds, and internal raw material defects such as slag inclusions and microcracks. Qualified products rely on controlled forming processes and solution treatment to retain sufficient ductility.
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