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Connecting parts that are intended for hygienic process systems, such as in dairy and food, for example, require extra attention because these are the places where bacteria could get a chance.
This is why special hygienic couplings have been developed that prevent spaces in the pipe system where bacteria can nest.
Hygienic couplings are always made of stainless steel, with parts that come into contact with the product usually made of 316 grade stainless steel.
Below you will find the 6 most commonly used types and their applications.
You can actually find the tri clamp connection in every standard for hygienic piping. In the ASME-BPE standard it is even the only approved connection method besides the weld connection of course
It is therefore the best possible way to quickly assemble and disassemble a pipe section for cleaning work. You don't even need any tools because a triclamp coupling can be tightened manually.
It is also a very reliable connection technique that rarely causes problems when used correctly. At 21°C, a tri clamp can withstand a pressure of more than 10 Bar and is suitable for almost all hygienic process systems.
What distinguishes this coupling most is the lack of male and female parts. With a triclamp connection, 2 identical liners are used. This makes all parts interchangeable and connectable to each other.
In short: if you have to regularly disassemble a pipe section or if you simply want to change your system, the tri clamp is the best coupling for the job.
Industries:
■ Dairy
■ Breweries
■ Cosmetics
■ Chemicals
■ Food and beverage
■ Pharmacy
■ Biotech
Available for tube standards:
- Two identical ferrules
- A hinged clamp
- A seal ring
>> Download Tri clamp 3D CAD Files ASME-BPE
>> Download Tri clamp 3D CAD Files BS4825
>> Download Tri clamp 3D CAD Files DIN
DIN 11851 is the German standard for four part hygienic unions.
In western European countries, DIN11851 is the coupling most often used in the dairy industry. It is therefore also called "milk coupling" or "dairy coupling" and an engineer immediately knows that it concerns the DIN11851 coupling version.
These types of unions are used in product lines that require regulary assembling and disassembling.
Normally the wetted parts are supplied in 316L stainless steel and the nuts are grade 304.
DIN 11851 unions are used extensively in Germany, but also throughout Europe and in the Middle East.
Industries:
■ Dairy
■ Breweries
■ Cosmetics
■ Chemicals
■ Food and beverage
■ Pharmacy
■ Biotech
For (tube) standards:
■ DIN 11850
Parts:
■ A male threaded part
■ A liner
■ A round slotted nut
■ A D-section seal
DIN11851 | SMS | |
Female part | Conical face | Flat face |
Male part | Deep seal | Turned up seal |
Seal | D-Shape | Square shape |
Working pressure | 25 bar (362 PSI) | 6 bar (87 PSI) |
In general, SMS couplings are available in the same countries as the DIN 11850 couplings.
Industries:
■ Dairy
■ Breweries
■ Cosmetics
■ Chemicals
■ Food and beverage
■ Pharmacy
■ Biotech
Available for tube standards:
■ BS 4825
■ ISO 2037
SMS union parts:
- Male threaded part
- Square shape seal
- Liner
- Round slotted nut
RJT (Ring Joint Type) unions are the most popular hygienic connection type in the UK, but they are also used in other countries.
Industries:
■ Dairy
■ Breweries
■ Cosmetics
■ Chemicals
■ Food and beverage
■ Pharmacy
■ Biotech
For tube standards:
■ BS 4825
■ ISO 2037
Parts:
■ A male threaded part
■ A pressed liner
■ A hexagon nut
■ An O-shape seal