CUNI Slip On Flange ASTM B466 UNS C71500 4 Inch ASME B16.5

Product Specification

CUNI Slip On Flange ASTM B466 UNS C71500 4 Inch ASME B16.5

1. Product Description

This product is a Slip-On (SO) flange manufactured from UNS C71500 (70/30 Copper-Nickel alloy / CuNi 70/30) in accordance with ASTM B466 and ASME B16.5 standards. Also known as CuNi30Fe1Mn or Werkstoff Nr. 2.0882, this alloy consists of approximately 70% copper and 30% nickel, with small additions of iron and manganese to enhance strength, corrosion resistance, and erosion resistance. A slip-on flange is designed to slide over the pipe end and is then welded both inside and outside, providing a strong, leak-proof connection. This 4-inch flange is suitable for low-to-medium pressure applications and is widely used in marine and seawater piping systems.

2. Key Product Parameters

3. Application / Usage

This slip-on flange is ideal for seawater and corrosive fluid systems:

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

• Offshore Oil & Gas: Platform piping, subsea applications, seawater injection

• Desalination Plants: Seawater intake, reverse osmosis feed lines, brine recirculation

• Power Generation: Condenser cooling water systems, heat exchangers

• Chemical Processing: Chloride-containing environments, cooling water units

4. Advantages

• Superior Corrosion Resistance: Exceptional resistance to seawater, pitting, crevice corrosion, and chloride stress corrosion cracking

• Biofouling Resistance: Copper content inhibits marine biological growth

• Higher Strength: 70/30 CuNi offers better strength and erosion resistance than 90/10 CuNi

• Cost-Effective: Slip-on design is easier to install and more economical than weld neck flanges

• Good Weldability: Single-phase alpha structure enables outstanding fabrication properties

5. Functions

The slip-on flange provides a bolted connection point for joining pipes, valves, or equipment. The flange slides over the pipe end and is secured by fillet welds on both the inside and outside, forming a strong, leak-proof joint. The flange face accommodates a gasket to ensure a reliable seal when bolted to a mating flange.

6. Installation Instructions

1. Unpacking Inspection: Check for transit damage; verify markings and dimensions per ASME B16.5.

2. Surface Preparation: Clean the pipe end and flange bore using dedicated tools; remove all oil, grease, and contaminants.

3. Positioning: Slide the slip-on flange over the pipe to the required position. The pipe end should not be flush with the raised face sealing surface.

4. Alignment: Rotate the flange to align bolt holes with the mating component.

5. Tack Welding: Apply tack welds at several points around the flange to hold it in place.

6. Final Welding: Perform fillet welds on both the inside and outside of the flange. TIG welding is recommended.

7. Post-Weld: Clean weld areas; no post-weld heat treatment required.

8. Bolting: Install gasket, bolts, and tighten in a cross-torque sequence to the recommended torque value.

7. Precautions

• Cleanliness: Requires a higher degree of cleanliness than carbon steel fabrication; use dedicated stainless steel tools.

• Temperature Limit: For aqueous corrosion service, verify system conditions for temperatures above 300°C.

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

• Medium Compatibility: Not recommended for use with strong oxidizing acids (e.g., nitric acid) or ammonia systems.

• Bolting Torque: Do not exceed recommended torque to prevent gasket damage or flange distortion.

• Gasket Selection: Choose gasket material compatible with the service medium and pressure/temperature conditions.

8. Shipping & Delivery

• Standard delivery time is typically 15–30 days, subject to order quantity, pressure class, 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.

• Third-party inspection (ABS, DNV, CCS, LR, BV, etc.) available upon request.

• 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.