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.