ASME Stub End

The American standard lap joint stub end is a core matching pipe fitting for American standard loose flange piping systems, specifically designed for European and American standard detachable pipeline connections, and is widely used in over

ASME Stub End - American standard lap joint stub ends are exclusively adapted for all overseas industrial, oil and ga...

ASME Stub End

The American standard lap joint stub end is a core matching pipe fitting for American standard loose flange piping systems, specifically designed for European and American standard detachable pipeline connections, and is widely used in over

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  • The core advantages of American standard lap joint stub ends are full American standard compliance, global universality, no welding stress, no cutting required for disassembly and assembly, weather resistance and corrosion protection, and a
  • dimensional tolerances, flange thickness, bevel angle, and mechanical properties fully meet the standards
  • Enables 100% universal interchangeability with global US-standard piping
  • ensuring obstacle-free acceptance in overseas engineering projects. The one-piece hot-pressed forming structure has no welds, no interlayers, and a smooth and flat end face
  • Fits tightly with US-standard loose flanges
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Detailed Introduction

The American standard lap joint stub end is integrally formed by a straight pipe section and a flanged ring flared outward at the end, welded to the pipe end, and paired with an American standard loose flange to form a detachable connection. The loose flange can rotate freely on the pipe body; when the bolts are tightened, it only presses the flanged end face to achieve sealing, and the pipe body itself does not bear the torsional stress of the flange, making later disassembly and maintenance convenient. Product specifications cover NPS1/2 to NPS48, wall thicknesses include the SCH series and the XXS thickened series, and pressure ratings are compatible with Class150 to Class2500. Raw materials use A234 WPB carbon steel, A403 stainless steel, A182 series alloy steel, and 2205/2507 duplex steel; forming processes include seamless hot pressing, steel plate rolled and welded, and forged machining. The flanged rounded corner transition is smooth, the end face is flat, and dimensional tolerances are controlled according to American standard requirements, allowing interchangeable matching with loose flanges of the same standard.

  • Manufactured according to ASME B16.9 and MSS SP-43, dimensional tolerances, flanged thickness, and groove angle are controlled according to American standard requirements, allowing interchangeable matching with loose flanges of the same standard worldwide
  • The loose flange can rotate 360° freely for alignment, reducing the difficulty of construction at high altitude and in narrow spaces; when the bolts are tightened, the pipe body itself does not bear the torsional stress of the flange
  • Specifications cover NPS1/2 to NPS48, wall thicknesses include SCH10S, SCH40S, SCH80S, SCH160, and XXS, and pressure ratings are compatible with Class150 to Class2500
  • Materials can be selected from A234 WPB carbon steel, A403 304/316L stainless steel, A182 F11/F22 alloy steel, and 2205/2507 duplex steel, matching different working conditions
  • Forming processes include seamless hot-pressed integral forming, steel plate rolled and welded, and forged precision machining, which can be selected according to project requirements
  • Supports customization such as non-standard straight pipe length, thickened flanged sealing face, special rounded corner radius, and non-standard groove angle, and can upgrade processes such as heat treatment, solution treatment, polishing, and galvanizing as needed
Product NameANSI Lap Joint Stub End
Product CategoriesFlanges & Lap Joint Stub Ends
The parameters of this series of American standard lap joint stub ends fully comply with the international standards ASME B16.9 and MSS SP-43, and are compatible with global American standard pipeline engineering design and acceptance specifications. Specification rangeAmerican standard nominal diameter NPS1/2–NPS48 (DN15–DN1200), divided into two international standard structural dimensions: long type and short type. Wall thickness grades: SCH10S, SCH40S, SCH80S, SCH160, XXS extra-heavy American standard full series; pressure pound ratings adapt to Class150–Class2500 full grades. Mainstream American standard materials: A234 WPB carbon steel, A403 304/316L stainless steel, A182 F11/F22 alloy steel, 2205/2507 duplex steel. Forming processes: seamless hot-pressed integrated forming, steel plate rolled and welded forming, forged precision machined forming. Pipe end bevel, flanged outer diameter, sealing surface flatness, fillet radius strictly
CustomizationOur factory possesses full-dimensional foreign trade upgrade and non-standard customization capabilities for American standard flanged stub ends, and can undertake various global American standard modification, special working condition, irregular size, and high-end process customization orders. Supports modification of conventional American standard sizes, can customize non-standard straight pipe lengths, thickened flanged sealing surfaces, special fillet radii, non-standard bevel angles, adapting to overseas narrow installation spaces and special high-pressure sealing working conditions. Can upgrade high-end processes on demand, including American standard alloy steel high-temperature heat treatment, duplex steel solution anti-corrosion treatment, stainless steel sanitary-grade mirror polishing, carbon steel hot-dip galvanizing weather-resistant upgrade, matching overseas high-temperature, strong corrosion, and clean harsh working conditions. Supports extra-large diameter irregular flanging, eccentric structures, extended buffer-type stub ends, special pound rating thickening customization, adapting to old overseas American standard pipeline network renovation, multi-standard
MOQOur factory's American standard flanged stub ends adopt a foreign trade flexible ultra-low minimum order quantity model, adapting to diverse needs such as overseas EPC project supplementary parts, foreign trade sample orders, bulk full-container distribution, and foreign-related engineering sporadic procurement. Common conventional specifications in the overseas market, including NPS1/2–NPS24 mainstream nominal diameters, SCH40/SCH40S standard wall thickness, WPB carbon steel/304 stainless steel common
Lead TimeThe factory has established a dedicated foreign trade production line and constant-temperature export warehousing for American standard pipe fittings, regularly stocking massive quantities of overseas common American standard flanged stub ends in stock, rapidly responding to urgent delivery needs of global foreign-related engineering projects. Overseas best-selling NPS1/2–NPS24, conventional wall thickness, WPB carbon steel, 304 stainless steel long and short type American standard flanged stub ends are all in stock, completing US-standard within 24 hours after order confirmation
PackagingAmerican standard flanged stub ends adopt international export sea freight-grade high-end protective packaging, specifically designed for cross-border long-distance sea, air, and land transport, eliminating issues such as transport deformation, end face scratches, moisture rust corrosion, and salt spray erosion. Small NPS1/2–NPS4 small-diameter stub ends are individually affixed with dust-proof protective film, fully wrapped with thickened bubble wrap, pipe ends fitted with high-strength hard plastic protective caps, focusing on protecting welding bevels and flanged sealing end faces, isolating seawater moisture, dust, and oxidation. Medium NPS5–NPS24 specification products are overall wrapped with double-layer waterproof and rust-proof woven fabric, reinforced corner protection, avoiding end face wear and surface damage caused by cross-border bumps. Large NPS26 and above large-diameter flanged stub ends use fumigated solid wood pallets for fixation, multi-point flexible steel strap reinforcement, double-layer waterproof sealed
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Applications

  • Overseas oil and gas petrochemical projects: oilfield oil and gas transmission pipelines, refining and chemical process pipe networks, hydrogenation unit pipelines and other American standard pipeline segmented connections
  • Power and thermal engineering: overseas thermal power, cogeneration, boiler high-temperature auxiliary pipelines and cross-border thermal transmission pipe networks, used to buffer pipeline thermal expansion and contraction deformation
  • Marine and maritime engineering: ocean-going vessels, offshore drilling platforms, coastal chemical pipe networks and other pipeline connections requiring seawater salt spray resistance and chloride ion corrosion resistance
  • Overseas municipal infrastructure: pipe connections and maintenance disassembly in water supply and drainage, gas and HVAC, and old American-standard pipeline network renovation in European and American cities
  • International EPC projects: equipment nozzle adaptation, multi-section pipeline network splicing, pipeline end sealing and plugging, and pipelines requiring frequent disassembly and maintenance

Purchasing & Delivery

We adopt a flexible minimum order quantity model for foreign trade, and can undertake overseas EPC project supplementary parts, foreign trade sample orders, bulk full-container distribution, and sporadic procurement for foreign-related projects. Conventional specifications NPS1/2–NPS24, SCH40/SCH40S standard wall thickness, WPB carbon steel and 304 stainless steel long and short products are kept in stock, and shipment preparation is completed within 24 hours after order confirmation. For specific minimum order quantities, stock specifications and delivery cycles, please contact us for confirmation. Packaging is carried out according to export sea freight standards: small-diameter products are fitted with hard plastic protective caps to protect the bevel and sealing end faces, medium-sized specifications are wrapped in double-layer waterproof and anti-rust woven fabric, and large diameters above NPS26 are fixed with fumigated solid wood pallets, which comply with international customs quarantine standards. Each batch is accompanied by Chinese-English certificates of conformity, material MTC reports and flaw detection documents.

Service & Support

Before sales, we provide American-standard specification selection, long and short type matching, pressure pound rating adaptation and material working condition consultation, helping to avoid model mismatch and installation errors. During sales, we synchronize production, re-inspection, export packaging and cross-border logistics customs declaration progress, and provide documents required for English engineering acceptance and customs clearance. After sales, we provide an 18-month international warranty period. During the warranty period, for dimensional deviation, end face deformation, process defects or sealing leakage problems caused by non-human installation errors, we provide free replacement and reissue. We are equipped with a foreign trade technical team to provide installation guidance, loose flange pairing and debugging, and remote troubleshooting. If you need to confirm specific configurations or request materials, please contact us.

FAQ

How to choose between long type and short type American-standard lap joint stub ends?

The long type has a longer pipe body and stronger buffering performance, suitable for oil and gas and power pipeline networks with high temperature, large thermal displacement, and obvious alternating temperature differences. The short type is compact in size, suitable for normal-temperature conventional American-standard pipeline projects with limited installation space. If you are unsure about the selection, you are welcome to provide pipeline working conditions and installation space information, and we will assist in confirmation.

Which flange does this lap joint stub end fit?

It is used with ASME B16.9 American-standard loose flanges. The flange can rotate freely on the pipe body, facilitating alignment and disassembly. It cannot be paired with butt welding flanges or slip-on flanges. If you need to confirm flange pairing dimensions, please contact us.

Do the products comply with international standards?

Produced according to the dual standards of ASME B16.9 and MSS SP-43, with dimensional tolerances, lap thickness, and bevel angles controlled per American standard requirements, and can be interchanged and matched with loose flange hangers of the same standard worldwide.

How are the minimum order quantity and delivery time confirmed?

Conventional specifications NPS1/2–NPS24, SCH40/SCH40S standard wall thickness, WPB carbon steel, and 304 stainless steel long and short pattern products are in stock, and shipping preparation is completed within 24 hours after order confirmation. For specific minimum order quantities, stock specifications, and delivery lead times, please contact us to confirm.

Can non-standard sizes or special materials be customized?

Yes. We support dimensional modifications such as non-standard straight pipe lengths, thickened lap sealing faces, special fillet radii, and non-standard bevel angles, and can also upgrade processes as needed such as alloy steel heat treatment, duplex steel solution treatment, stainless steel mirror polishing, and carbon steel hot-dip galvanizing. Please provide the specific dimensions, materials, and quantities, and we will assist in confirming the solution.

What are the export packaging and accompanying documents?

Packaging according to export sea freight standards: small diameters are fitted with hard plastic protective caps to protect the bevel and sealing end faces, medium specifications are wrapped in double-layer waterproof and rust-proof woven fabric, and sizes NPS26 and above are secured on fumigated solid wood pallets. Each batch is accompanied by Chinese-English certificates of conformity, material MTC reports, and flaw detection inspection documents.

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