Butt-welding Pipe Fittings Short Type Stub End CuNi9010 1" SCH10 ASME B16.9

Butt-welding Pipe Fittings Short Type Stub End CuNi9010 1" SCH10 ASME B16.9

1. Product Description

This product is a butt-welding short type stub end, manufactured from CuNi 90/10 (Copper-Nickel 90/10, UNS C70600) in accordance with ASME B16.9 and MSS SP-43 standards . Also known as CuNi10Fe1.6Mn, this alloy consists of approximately 90% copper and 10% nickel with small but important additions of iron and manganese to enhance overall strength and corrosion resistance . A stub end is a short pipe fitting used in conjunction with a lap joint flange to create a bolted, detachable connection . The short type features a shorter length (F dimension) compared to the long type, suitable for applications where space is limited . The 1" Schedule 10 fitting has a beveled end for butt-welding to the pipe, and a flared/lapped face for sealing against the flange.

2. Key Product Parameters

3. Application / Usage

This stub end is ideal for seawater and corrosive fluid systems requiring frequent disassembly:

• Marine & Shipbuilding: Seawater cooling systems, firewater lines, ballast systems 

• Offshore Oil & Gas: Seawater injection systems, heat exchangers 

• Desalination Plants: Seawater intake, reverse osmosis feed lines 

• Power Generation: Condenser cooling water systems 

• Chemical Processing: Corrosive fluid handling, where frequent pipeline dismantling is needed 

4. Advantages

• Superior Corrosion Resistance: Exceptional resistance to seawater, pitting, crevice corrosion, and stress corrosion cracking; called "offshore engineering alloy" for this reason 

• Biofouling Resistance: Forms a protective oxide layer that naturally resists marine biological growth 

• Cost-Effective: Offers a favorable balance of performance and cost compared to 70/30 CuNi or higher nickel alloys 

• Easy Maintenance: Stub end design enables quick disassembly and reassembly without cutting or welding for pipeline inspection and cleaning 

• Excellent Weldability: Readily weldable using standard GTAW processes with matching ERCuNi filler 

5. Functions

The stub end provides a detachable, leak-proof connection point within a piping system. When welded to the pipe end, its lapped face forms a seal with a lap joint flange and gasket, enabling the flange to rotate freely for bolt-hole alignment . This design is particularly useful for systems requiring frequent maintenance, cleaning, or component replacement .

6. Installation Instructions

1. Preparation: Degrease and clean pipe ends and stub end weld areas thoroughly; CuNi requires a higher degree of cleanliness than steel

2. Alignment: Accurately align the stub end's beveled end with the pipe end, ensuring proper fit-up

3. Welding: Use GTAW (TIG) process with ERCuNi filler wire (AWS A5.7); use 100% argon shielding; back purge recommended for root pass to prevent internal oxidation 

4. Assembly: Slide the lap joint flange over the stub end, place a gasket between the lapped faces, and tighten bolts evenly

5. Post-Weld: No post-weld heat treatment required; clean with stainless steel brush to leave a bright finish

7. Precautions

• Cleanliness: Requires a higher degree of cleanliness than carbon steel fabrication to prevent weld contamination

• Temperature Limit: For aqueous corrosion service, limit to approximately 470°C; verify system conditions

• Welding Heat Input: CuNi puddle is sluggish with an oxide film; requires appropriate amperage control

• Compatibility: Not recommended for use with nitric acid or ammonia systems

• Lap Face Protection: Protect the lapped face from scratches or damage during handling and installation

8. Shipping & Delivery

• Standard delivery time is typically 15–30 days, subject to order quantity and specification availability 

9. Payment Terms

• Common international payment methods include T/T (Telegraphic Transfer) and L/C at sight (Letter of Credit) 

10. Packaging

• Products are securely packed in plywood cases or wooden crates with internal cushioning to ensure safe transportation and prevent damage during transit 

11. After-Sales / Return & Warranty Policy

• All products undergo strict quality inspection before shipment, with Mill Test Certificates (EN 10204 3.1/3.2) available

• In case of quality issues, retain original packaging and provide relevant photos or third-party inspection reports

• Specific return, exchange, and warranty terms are subject to the final sales contract agreement.

FAQ

1. Are you trading company or manufacturer ?
    We are manufacturer ,You can see the certification.
2. How long is your delivery time?
    Generally it is 5-10 days if the goods are in stock. or it is 15-20 days if the goods are not in stock, it is according to quantity.
3. Do you provide samples ? is it free or extra ?
    Yes, we could offer the sample for free charge but need pay the cost of freight.
4. What is your terms of payment ?
    Payment<=1000USD, 100% in advance. Payment>=1000USD, 50% T/T in advance ,balance before shippment.