LK Armatur LK Group English
Close
0

Menu

LK Group

LK Group

  • LK Armatur

    LK Armatur is a leading producer in Europe, manufactures millions of valves per year for the global HVAC market. Our solutions are based on a comprehensive view of how valves, control units, components and prefabricated products work together. Svenska English Deutsch Italiano Yкраїнська Suomi

  • LK Systems

    LK Systems is the leading manufacturer of easy-to-install systems for heating and tap water distribution and pre-insulated pipes in the Nordics. Through our prefabrication factory, we also provide tailor-made solutions that simplify the installation process even further. Svenska English Norsk Suomi

  • LK Pex

    Our PEX Pipe Extrusion business area is an innovative manufacturer of high-quality plastic pipes for the heating and plumbing industry. Our core is the efficient, high-technology production process for crosslinked PE-Xa pipes, resulting in products with a unique combination of flexibility and hydrostatic strength. English

  • LK Group

    LK is a family-owned trading and production group, operating on a global scale within the HVAC-area. We are the market leader in Sweden and has an increasing sales of products, systems and solutions in the Nordic countries, Europe and the USA. Svenska English

Collaring

Create branch connections without fittings

Collaring is a method for creating branch connections directly in the pipe wall, removing the need for a separate T-fitting. This reduces the number of soldered or welded joints, saves space, and simplifies installation. It's a smart choice for compact, efficient system designs in both copper and stainless steel.

Collaring for soldering
The branch pipe is notched before insertion to maintain flow through the main pipe. Suitable for both heating and tap water systems.

Collaring for fillet welding
The branch pipe is inserted without notching. Ideal for heating systems without special hygiene requirements.

Collaring for butt welding
The branch pipe is aligned edge-to-edge and welded after filing. Recommended for tap water systems where hygiene is critical.

Minimum distance
A: Minimum centre-to-centre distance from bend to collar: 86 mm
B: Minimum distance from collar to fitting: 15 mm

Required wall thickness for collaring copper pipes (mm)

Required wall thickness for collaring stainless steel pipes (mm)

Pipe Ø →
Collar Ø ↓

 12 15 18 22 28 35 42
8 1.0 1.0 1.0 1.0 1.0 1.0 1.0
10 1.0 1.0 1.0   1.2   1.2
12 1.0 1.0 1.0   1.2   1.2
15       1.5 1.5 1.5 1.5
18       1.5 1.5 1.5 1.5
22       1.5      
28         1.5    
35           1.5  

 

Pipe Ø →
Collar Ø ↓

 12 15 18 22 28 35 42
10 1.0 1.0 1.0 1.0 1.0 1.0 1.0
12 1.0 1.0     1.0 1.0 1.2
15   1.0     1.0 1.0 1.2
18     1.0   1.0 1.0 1.2
22         1.0    
28         1.0