MSS SP 83 A182 F304 Pipe Unions
MSS SP-83 A182 F304 Pipe Unions are pipeline quick-connect couplings compliant with the MSS SP-83 standard, manufactured from ASTM A182 F304 stainless steel. Designed for corrosive media, high-temperature, or sanitary applications, they are widely used in chemical, food, pharmaceutical, and other industries.
High Quality MSS SP 83 A182 F304 Pipe Unions
- Pressure Rating: Class 3000 and 6000
- Size Range: typically NPS 1/8″ to 4″
- Types: socket weld and threaded (NPT) unions.
Key Features
- Corrosion Resistance: Superior to carbon steel (A105), resistant to weak acids, alkalis, and chlorides.
- Sanitary Design: Smooth, crevice-free surfaces for easy cleaning (compliant with FDA/EHEDG standards).
- High-Temperature Performance: Better oxidation resistance than plastics or other metals.
Material Properties (ASTM A182 F304)
- ASTM A182 F304: Austenitic stainless steel containing 18% chromium and 8% nickel, offering excellent corrosion resistance and formability.
- Temperature Range: -196°C to +800°C (short-term peak), with a recommended operating range of -29°C to +425°C.
- Surface Finish: Can be polished to Ra ≤0.8μm (for food/pharmaceutical-grade requirements).
Structure & Types
Three-Piece Design:
- Consists of two threaded or socket weld ends (male/female) and a central nut for quick assembly/disassembly.
- Sealing: Metal-to-metal contact (no gasket), relying on precision machining for leak-proof performance.
Connection Types:
- Threaded Unions: Use NPT threads for pipe connections.
- Socket Weld Unions: Welded to pipes for higher-pressure applications.
Pressure Ratings:
- Class 3000 (~750 psi) and Class 6000 (~1500 psi). Pressure-temperature ratings are defined in standard tables.
Typical Applications
- Chemical Industry: Transporting acids, alkalis, and organic solvents (e.g., dilute sulfuric acid, acetic acid).
- Food/Pharmaceutical: Sanitary piping systems (requires electropolishing or mirror-finish interiors).
- Energy: High-temperature steam tracing lines (≤425°C).
- Marine: Seawater cooling systems (note: for high chloride environments, F316 is recommended).
One-Stop MSS SP 83 A182 F304 Pipe Unions Provider for All Your Needs
SSM has significant product advantages in manufacturing MSS SP 83 A182 F304 Pipe Unions. Whether it’s quality or price, we will meet your needs.
More Information about MSS SP 83 A182 F304 Pipe Unions
Mandatory Certifications:
- MSS SP-83 compliance
- ASTM A182 F304 material test reports (chemical composition & mechanical properties)
Optional Certifications:
- Sanitary: FDA 21 CFR, EHEDG
- Explosion-Proof: ATEX (for flammable environments)
Selection Guidelines
Avoid:
- High-chloride environments (e.g., untreated seawater may cause pitting; use F316L instead).
- Long-term use >425°C (may lead to carbide precipitation, reducing corrosion resistance).
Installation Notes:
- Socket weld requires a 1.6mm expansion gap.
- Threaded connections should use PTFE tape (prohibited for oxygen pipelines).
Comparison with Carbon Steel (A105) & Low-Temp Steel (A350 LF2)
| Feature | A182 F304 | A105 (Carbon Steel) | A350 LF2 (Low-Temp Steel) |
| Material | Stainless Steel (18-8 Cr-Ni) | Carbon Steel | Nickel-Alloyed Carbon Steel |
| Corrosion Resistance | Excellent | Poor (requires coating) | Moderate (atmospheric only) |
| Temp. Range | -196°C to +800°C | -29°C to +425°C | -46°C to +343°C |
| Cost | Higher | Low | Medium-High |
FAQ
F304L has lower carbon content (≤0.03%), offering better post-weld resistance to intergranular corrosion but slightly lower strength. For welded joints in corrosive media, F304L is preferred.
- Yes, but must comply with NSF/ANSI 61 drinking water safety standards.
- Dimensions are similar, but MSS SP-83 is specific to unions, while B16.11 covers more fitting types (e.g., elbows). Interchangeable if pressure ratings match.
MSS SP-83 A182 F304 Pipe Unions are ideal for corrosive, sanitary, or high-temperature systems, balancing corrosion resistance, strength, and cost. Selection must consider fluid composition, temperature, and pressure. Always source from certified suppliers.
For technical documents (e.g., dimension tables, P-T ratings), contact us for full specifications!
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