Can SMS 1145 Sanitary Stainless Steel Union Sets Be Used in Pharmaceutical and Dairy Applications
2026-09-30
When specifying hygienic piping systems for sterile processing or milk production, engineers frequently evaluate whether SMS 1145 Sanitary Stainless Steel Union Sets meet the strict demands of these industries. At DINGYUE, we manufacture SMS 1145 Sanitary Stainless Steel Union Sets that comply with the Swedish Milk Standard (SMS 1145), a norm originally developed for dairy but now widely accepted in pharmaceutical and biotech environments where cleanability and product purity are non-negotiable.
What Makes SMS 1145 a Hygienic Standard?
The SMS 1145 standard defines a union connection with a specific thread profile, sealing geometry, and dimensional tolerance. Unlike generic clamp fittings, SMS 1145 Sanitary Stainless Steel Union Sets use a flat gasket seat and a rounded nut design that eliminates crevices where bacteria can accumulate.
| Feature | SMS 1145 Requirement | Benefit |
|---|---|---|
| Material | AISI 304 / 316L stainless steel | Corrosion resistance, cleanability |
| Surface Finish | Ra ≤ 0.8 µm (internal) | Prevents biofilm adhesion |
| Gasket | EPDM, silicone, PTFE | FDA-compliant sealing |
| Thread | SMS round thread | Secure, leak-free assembly |
| Temperature Range | -20°C to 150°C (gasket dependent) | Suitable for CIP/SIP |
Pharmaceutical Applications
In pharmaceutical production, contamination control is governed by cGMP and ASME BPE principles. SMS 1145 Sanitary Stainless Steel Union Sets from DINGYUE are used in:
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Water for Injection (WFI) distribution loops
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Clean steam and purified water lines
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Buffer preparation and filtration skids
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Fermentation and bioreactor sampling ports
The smooth bore and crevice-free joint design allow effective Clean-in-Place (CIP) and Steam-in-Place (SIP) cycles. DINGYUE offers electropolished options that reduce surface roughness to Ra ≤ 0.4 µm, meeting the most demanding pharmacopeial requirements.
Dairy Applications
Dairy processing exposes fittings to fatty residues, protein deposits, and daily caustic/acid washes. SMS 1145 Sanitary Stainless Steel Union Sets are the original dairy standard, and DINGYUE manufactures them to withstand:
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Pasteurizers and homogenizers
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Milk receiving and storage tanks
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Cheese vats and whey lines
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Yogurt and ice cream filling equipment
The 316L variant provides superior resistance to chlorides present in cleaning chemicals, extending service life.
Key Selection Criteria
| Criterion | Pharmaceutical | Dairy |
|---|---|---|
| Material | 316L preferred | 304 or 316L |
| Surface Finish | Ra ≤ 0.4 µm | Ra ≤ 0.8 µm |
| Gasket | PTFE / silicone | EPDM |
| Certification | FDA, USP Class VI | FDA, 3-A |
| Cleaning Method | SIP / CIP | CIP |
Why Choose DINGYUE?
DINGYUE supplies SMS 1145 Sanitary Stainless Steel Union Sets with full material traceability, mill certificates, and dimensional inspection reports. Every batch is pressure-tested and surface-verified before shipment. Our fittings are interchangeable with major SMS-compliant systems, reducing downtime and inventory complexity.
Frequently Asked Questions
Q: Are SMS 1145 Sanitary Stainless Steel Union Sets suitable for both pharmaceutical and dairy use?
A: Yes. SMS 1145 Sanitary Stainless Steel Union Sets are accepted in both industries when the correct material, gasket, and surface finish are selected for each application.
Q: What is the maximum pressure rating of SMS 1145 Sanitary Stainless Steel Union Sets?
A: Depending on size and gasket, SMS 1145 Sanitary Stainless Steel Union Sets typically handle pressures up to 10 bar at ambient temperature, with derating at elevated temperatures.
Q: Can DINGYUE provide FDA-compliant gaskets with SMS 1145 Sanitary Stainless Steel Union Sets?
A: Absolutely. DINGYUE supplies SMS 1145 Sanitary Stainless Steel Union Sets with FDA-approved EPDM, silicone, and PTFE gaskets to meet regulatory requirements.
Contact Us
For specification sheets, pricing, or custom SMS 1145 Sanitary Stainless Steel Union Sets tailored to your pharmaceutical or dairy project, contact DINGYUE today. Our engineering team will help you select the right material, finish, and gasket for your process.
