SMS 1145 Sanitary Stainless Steel Union Sets

In international food, dairy, and beverage processing, the Swedish Metric Standard is widely recognized for its compact design, ease of installation, and cost-effective maintenance. The SMS 1145 Sanitary Stainless Steel Union Sets are popular sanitary fitting assembly consisting of a slotted spanner nut, a male threaded end, a liner, and a flat L-shaped elastomeric seal ring. Designed to create a smooth, flush interior pipe transition, it minimizes fluid turbulence and eliminates bacteria-trapping crevices, allowing for rapid disassembly during routine cleaning or line modification.

Technical Specifications

Primary Application Scenarios

Due to its light-weight profile and user-friendly threaded locking system, choosing an SMS union is standard across high-throughput hygienic systems:

Dairy & Ice Cream Processing: Connecting pasteurizer loops, cream separators, and milk storage tanks where CIP cycles are performed daily.

Brewing & Craft Beverage: Ideal for brewhouse cellars, transfer hoses, and carbonation skid lines.

Food & Edible Oil Manufacturing: Used in liquid egg, syrup, ketchup, and sauce production pipelines.

Personal Care & Cosmetics: Joining piping networks for shampoo, liquid soap, and moisturizing creams.

Operating & Maintenance Guidelines

To ensure a reliable, leak-free connection and extend gasket operational lifespan:

Alignment Checks: Align the male nipple and liner axially before engaging the spanner nut to prevent uneven gasket compression and thread damage.

Tool Usage: Tighten the slotted nut using a dedicated SMS hook spanner to achieve uniform sealing pressure without damaging the external slots.

Routine Inspection: Inspect any active SMS union during scheduled plant maintenance for signs of gasket swelling, hardening, or thread wear, replacing seals as needed.

Precision Manufacturing & Quality Assurance

Our SMS 1145 Sanitary Stainless Steel Union Sets are precision CNC-machined from forged stainless steel to guarantee zero porosity and high mechanical strength. Every unit undergoes strict thread gauge testing, dimensional verification, and surface roughness measurement. Shipped with protective thread covers and scratch-resistant packaging, our fittings arrive ready for immediate orbital welding or pipeline installation.

Support Services

We specialize in high-precision sanitary valves, fittings, and union assemblies for international piping contractors and OEMs. We offer full material traceability (3.1 MTC), custom adaptors, and fast international dispatch from our extensive stock. Integrating a precision-crafted SMS union into your liquid handling facility guarantees efficient flow performance, regulatory compliance, and long-term operational uptime.

Frequently Asked Questions

Q1: What is the main difference between an SMS union and a DIN union?

A: An SMS union features a more compact, lightweight structure with a flat L-shaped seal ring, making it easier to assemble in tight spaces, whereas a DIN union (DIN 11851) uses heavier threads, a D-section seal, and higher wall thicknesses for extreme pressure environments.

Q2: Can I replace the gasket without disconnecting the welded liners from the pipe?

A: Yes, simply loosen the SMS spanner nut and back it off along the pipe; the gap allows you to pull out the old L-shaped gasket and snap in a new one without cutting or un-welding the pipeline.