Threaded Half Nipple ASTM A815 UNS S31803 Duplex Stainless Steel 1" SCH20 ASME B16.11

Threaded Half Nipple ASTM A815 UNS S31803 Duplex Stainless Steel 1" SCH20  ASME B16.11

1. Product Description

This product is a threaded half nipple (also known as a hex nipple or pipe nipple) manufactured from UNS S31803 (Duplex 2205 / F51) stainless steel in accordance with ASTM A815 and ASME B16.11 standards. A half nipple is a short length of pipe with male NPT threads on one end and a plain or threaded other end, used for connecting two female-threaded components in a piping system. UNS S31803 is a dual-phase stainless steel with a microstructure of approximately 50% ferrite and 50% austenite, offering roughly double the yield strength of standard 300-series austenitic stainless steels while maintaining good ductility and weldability. This 1" SCH20 Class 3000# fitting is designed for threaded connections in high-pressure and corrosive service applications.

2. Key Product Parameters

3. Application / Usage

This threaded half nipple is ideal for high-pressure and corrosive fluid systems requiring threaded connections:

• Oil & Gas: Offshore platforms, subsea piping, wellhead connections, chemical injection lines

• Chemical Processing: Chloride-containing process streams, acid services, heat exchangers

• Marine Engineering: Seawater piping systems, desalination plants

• Power Generation: Cooling water systems, high-temperature service

• Pulp and Paper: Bleaching lines, digester systems

4. Advantages

• Superior Strength: Yield strength (450 MPa) is approximately double that of standard austenitic stainless steels like 316L, enabling thinner wall designs

• Excellent Corrosion Resistance: PREN ~34-36 provides outstanding resistance to pitting, crevice corrosion, and chloride stress corrosion cracking

• Threaded Convenience: Male NPT threads enable fast installation and easy disassembly without welding

• Cost-Effective: Lower nickel content compared to austenitic grades offers significant material cost savings

• Good Weldability: Compatible with standard welding procedures; heat treatment recommended post-weld

5. Functions

The threaded half nipple provides a reliable, leak-proof mechanical connection between two female-threaded components (fittings, valves, or pipe ends). It serves as a transition piece in small-bore piping systems, enabling quick assembly, disassembly, and component replacement without welding operations. For the 1" SCH20 Class 3000# configuration, it provides a durable connection for high-pressure and corrosive service applications.

6. Installation Instructions

1. Unpacking Inspection: Check for transit damage; verify markings, dimensions, and pressure class per ASME B16.11

2. Surface Preparation: Clean pipe threads and nipple threads thoroughly; remove all dirt, oil, and debris

3. Thread Sealant: Apply PTFE tape or pipe dope to male threads to ensure a reliable seal

4. Thread Engagement: Screw the nipple into the first female fitting by hand, then tighten with a wrench to appropriate torque

5. Avoid Over-tightening: Do not exceed recommended torque to prevent cracking the fitting body

6. Inspection: After installation, perform leak test per system requirements

7. Precautions

• Thread Compatibility: NPT, BSPT, and BSPP threads are not interchangeable. Verify thread type per system specification

• Temperature Limitation: Not recommended for use above 300°C or below -50°C due to reduced toughness and embrittlement risk

• Ferrite Balance: Ensure proper material specification to maintain the 50/50 austenite-ferrite microstructure

• Vibration Sensitivity: Threaded fittings are not recommended on lines subject to significant vibration, thermal shock, or hazardous fluid service

• Cleanliness: Requires a higher degree of cleanliness than carbon steel fabrication; use dedicated tools to prevent contamination

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.